Data Sets Catalog (with EML file)

Select "non-LTER" in the "Program" window to get a list of non-LTER data sets that we have agreed to host in this site. Owners of non-LTER data sets are associated to LUQ

Numeric Dataset ID Data Set Identifiersort icon Abstract Contact Duration Collected From: EML
1 Anole ground level transects (Bisley and El Verde)

Transects are surveyed through the upper and lower cut plots at Bisley to determine the distribution and minimum abundance of anoles within and adjacent to the plots. Surveys began prior to cutting will continue seasonally (wet and dry) to document changes as the plots regenerate. One set of two...

Douglas Reagan Completed 02/21/1989 - 10/21/1992
2 Anole treefall gap transects (Bisley and El Verde-H10 Gaps)

Transects were established through large recent treefall gaps to determine the relative abundance of different anole species at different distances from the center of the gap.

Douglas Reagan Completed 02/18/1989 - 02/24/1989
4 Anole Vertical Transects (tower data)

Transects are conducted to note the vertical distribution and relative abundance of anole species. Data permit the calculation of average sighting distance for each species which is used in the final calculation of abundance.

Douglas Reagan Completed 01/09/1989 - 10/23/1992
5 Anole Mark and Resight Study

The population distribution research area of the LEF LTER is designed to gather information on the distribution and abundance of key plant and animal species within the forest under different disturbance regimes. Multiple mark and resight studies were conducted to determine the population...

Douglas Reagan Completed 02/18/1989 - 10/26/1992
6 Anole grid study (El Verde 9Ha and Bisley)

Transects 60 m long are conducted at alternate points in the 9 ha grid at El Verde. Transects 80 m long are conducted at alternate points at the Bisley Grid in watersheds #1 and #2. Data are used to support the GIS database.

Douglas Reagan Completed 04/02/1989 - 12/15/1990
7 Soil sample from landslide ES1 (Espiritu Santo El Verde), ES2, and RB2 (Rio Blanco)

Analysis of soil nutrients in top 9 cm of soil in Landslide Revegetation Plots.

Completed 02/22/1989 - 02/24/1989
8 Canopy gap survey at El Verde

The survey of gaps at El Verde covers about 35 ha, including the 9 ha grid. We defined a treefall gap at El Verde as a hole in the forest canopy extending down to an average height of about 3 m or less above ground. The edge of a gap was delineated by the vertical projection of the edge of the...

Nicholas Brokaw Completed 11/01/1988 - 11/30/1988
14 Rainfall at El Verde Field Station, Rio Grande, Puerto Rico since 1975

Rainfall has been measured at the El Verde Field Station since 1964. McDowell and Estrada-Pinto, 1988 presents a description of the collection procedures, raw data from 1964 to 1986, and some summary statistics for this period of record. Precipitation for this period showed some seasonality in...

Alonso Ramirez
Long-Term
Ongoing
01/01/1975 - 05/31/2014
15 Revegetation of landslides, vegetation <0.1m (Small landslide plots at the Luquillo Experimental Forest)

The purpose of this study is to document the recovery of vegetation on new landslides in the Luquillo Experimental Forest, in particular seedlings <1m tall.

Lawrence R. Walker
Long-Term
Completed
06/03/1988 - 12/19/2007
16 Maximum temperature at El Verde Field Station, Rio Grande, Puerto Rico since 1975

Daily emperature has been measured at the El Verde Field Station since 1975 (see methods). Monthly averages have been calculated. Maximum values for maximum temperature were recorded from May to October with a range from 29 to 30 and peaks of 29.7 Centigrade in October. The months of October...

Alonso Ramirez
Long-Term
Ongoing
10/01/1992 - 05/31/2014
17 Minimum temperature at El Verde Field Station, Rio Grande, Puerto Rico since 1975

Daily emperature has been measured at the El Verde Field Station since 1975 (see methods). Monthly averages have been calculated. Lowest average values for minimum temperature were recorded from January to April with nearly 18 Centigrades during this period of time (see chart). During these...

Alonso Ramirez
Long-Term
Ongoing
01/01/1975 - 05/31/2014
18 Revegetation of landslides, vegetation > 1.0m (Large landslide plots at the Luquillo Experimental Forest)

Here we use permanent plot data sampled from 16 landslide to documents temporal successional pathways in landslide patches (without the use of a chronosequence, cf. Guariguata 1990) and address the following questions: (1) What are the successional pathways of landslide and what species define...

Lawrence R. Walker
Long-Term
Completed
06/03/1988 - 12/18/2007
20 Chemistry of stream water from the Luquillo Mountains

Stream water is collected weekly at the Luquillo Mountain sites listed below. These data sets begin as early as 1983; LTER sampling began in 1988.

Stream water samples are grab samples taken from the water/air interface at stream channel center on the sampling day (usually...

William H. McDowell
Long-Term
Ongoing
05/24/1983 - 02/23/2010
21 Vegetation profile and canopy height of Tabonuco, Colorado and Cloud Forests

The overall height and the presence of vegetation in different height intervals above ground is recorded above points on a 5 x 5 m grid in three hectare-sized plots in the Luquillo Experimental Forest, Puerto Rico. One plots each is in tabonuco forest (350 m elevation), colorado forest (650 m)...

Nicholas Brokaw
Long-Term
Ongoing
05/01/1989 - 08/08/2008
22 Cecropia growth at El Verde gaps

While doing the survey of gaps at El Verde the number and height of Cecropia saplings found in gaps where recorded. Since this species is mostly restricted to gaps, an estimate of the total population of Cecropia in the regeneration size classes in the forest can be obtained. (There are others...

Nicholas Brokaw Completed 08/01/1989
23 Bird abundance - point counts

Circular plot counts are used to measure relative numbers of birds over time and between sites. The duration of each count is 10 minutes. During this period, all birds heard or seen are recorded on a data sheet in one of two categories: 1) within 25 m of the observer (< 25 m) and 2) further...

Robert B. Waide
Long-Term
Ongoing
06/06/1989 - 05/09/2012
24 Anoline Lizard Food Habits

The stomach contents of 10 adult individuals of each of three anole species (Anolis gundlachi, A. evermanni, and A. stratulus) were collected to determine the number, type, and volume of prey consumed following Hurricane Hugo. Gut contents were identified to the lowest taxon possible and were...

Douglas Reagan Completed 10/30/1989 - 03/19/1991
25 Frog transect data

Relative abundance of all size classes of Eleutherodactylus coqui was measured along control and experimental transects in a variety of disturbance regimes.

Lawrence L. Woolbright Completed 06/12/1989 - 07/20/1989
29 Bisley daily rainfall (Bisley weekly environmental data)

Data set includes all available daily, weekly, and monthly rainfall from several climate stations in the northeast section of the Luquillo Experimental Forest. These stations are surround the Bisley Experimental watersheds and the Sabana Field Station are are operated by the USFS and the USGS....

Completed 11/06/1990 - 10/20/2011
30 Frog grid data (Bisley)

Population estimates from 1987 to 1995 are reported for the terrestrial anuran, Eleutherodactylus coqui, from four long-term study plots in the Luquillo Experimental Forest of northeastern Puerto Rico. The major factor influencing population size during this time was Hurricane Hugo, which...

Lawrence L. Woolbright Completed 06/01/1989
31 Bisley 40 X 40 grid vegetation and site characteristics

Relationships between landforms, soil nutrients, forest structure, and the relative importance of different disturbances were quantified in two subtropical wet steepland watersheds in Pueno Rico. Ridges had fewer landslides and treefall gaps, more above-ground biomass, older aged stands, and...

Completed 03/01/1988 - 03/31/2004
33 Meteorological data from towers (pre-Hugo) or rooftop (post Hugo) at El Verde

The meteorological sensors were installed above the flat concrete roof of El Verde Field Station (elevation: 350 m asl). The building is in an approx. 0.3 ha clearing in a forest approx. 20 m tall. Data were processed and temporarily stored in a Campbell 21X data logger on-site. The station was...

Alonso Ramirez Completed 01/01/1995 - 12/31/2000
36 Landslide Revegetation Canopy Measurements & Cover Estimates

The purpose of this data set is to document recovery of vegetation in new landslides in the Luquillo Experimental Forest (LEF)

Lawrence R. Walker
Long-Term
Completed
10/25/1988 - 12/17/2007
37 Regeneration after Hurricane Hugo, woody species > 10 cm tall (9Ha grid, El Verde) (9Ha Plots Small Data Set)

The purpose of this data set is to document vegetation damage and recovery following Hurricane Hugo, a borderline category 3-4 hurricane with winds from 130 to 160mph (110kts) and a pressure of 945 to 946.1 mb, which hit Puerto Rico in September 18th, 1989

Lawrence R. Walker Completed 06/06/1990 - 11/01/1994
38 Regeneration after Hurricane Hugo woody species more than 1m tall (9ha grid, El Verde) (Large 9Ha Grid)

The purpose of this data set is to document vegetation damage and recovery following Hurricane Hugo, a borderline category 3-4 hurricane with winds from 130 to 160mph (110kts) and a pressure of 945 to 946.1 mb, which hit Puerto Rico in September 18th, 1989.

Lawrence R. Walker Completed 06/06/1990 - 11/02/1994
39 Regeneration after Hurricane Hugo woody species greater than 1cm tall (9ha grid, El Verde)(Wood fall from Hurricane Hugo 9Ha Grid)

The purpose of this data set is to document vegetation damage and recovery following Hurricane Hugo, a borderline category 3-4 hurricane with winds from 130 to 160mph (110kts) and a pressure of 945 to 946.1 mb, which hit Puerto Rico in September 18th, 1989.

Lawrence R. Walker Completed 06/06/1990 - 01/17/1992
40 Regeneration after Hurricane Hugo woody species > 1m tall and below 3m: percent cover (9 ha grid, El Verde)

Purpose was to document vegetation damage and recovery following Hurricane Hugo.

Completed 06/06/1990 - 11/05/1993
41 Habitat selection/Caracolus caracolla and other snails

The data set consists of three files, one containing data from 1991 to 1994, one with data from 1995 to 2000, and another containing the 2001 data. Various habitat characteristics are presented, as well as the apparency of common plant taxa at 7 heights (every 0.5 m from ground level to 3 m)....

Long-Term
Ongoing
07/01/1991 - 07/01/2010
42 Bisley Grid Habitat data 1994, 1999

The data set consists of one file containing data from the summers of 1994 and 1999. Various habitat characteristics are presented, as well as the apparency of common plant taxa at 7 heights (every 0.5 m from ground level to 3 m). However, the data for some plant species were not divided by...

Completed 06/22/1994 - 08/22/1999
43 Bisley Grid Invertebrate Data, 1989-1999

The data set consists of counts of terrestrial invertebrates from the grid at Bisley Watersheds #1 and 2, for the years 1989, 1990, 1994, and 1999. Data for 1989 and 1990 are confined to 4 species of terrestrial snails: Caracolus caracolla, Gaeotis nigrolineata, Nenia tridens, and Polydontes...

Completed
06/01/1989 - 08/07/1999
06/01/1989 - 08/07/1999
06/01/1989 - 08/07/1999
06/01/1989 - 08/07/1999
06/20/1994 - 07/07/1994
08/01/1999 - 08/07/1999
44 Frog population plots (El Verde + Bisley)

Long-term population patterns of coquies likely result from a variety of influences. Key among these are moisture, the physical habitat as affected by succession and disturbances of...

Lawrence L. Woolbright Completed
01/02/1987 - 01/14/1997
03/24/1991 - 12/31/1997
03/25/1991 - 12/31/1991
10/16/1990 - 12/30/1998
10/16/1990 - 12/30/1998
45 Frog spatial distribution data (El Verde + Bisley)

Most Puerto Rican Eleutherodactylus are terrestrial frogs that breed for prolonged periods of time in more or less continuous habitat. Because their life cycle lacks a free living larvae stage, reproductive behavior is not tied to bodies of water and they do not have the large...

Lawrence L. Woolbright Completed 03/01/1988 - 05/30/1993
46 Elevation at grid points on the Luquillo Forest Dynamics Plot (LFDP)

This file contains data that describe the physical and environmental attributes of the LFDP. The attributes include elevation, topography type, and percentage slope. All data are given for the 20 m by 20 m quadrat scale. Information on soils are taken form an interpolation of the soil map...

Completed 06/15/1990 - 01/30/1992
47 Physical environment of the Luquillo Forest Dynamics Plot (LFDP), Puerto Rico

This file contains data that describe the physical and environmental attributes of the LFDP. The attributes include elevation, topography type, and percentage slope. All data are given for the 20 m by 20 m quadrat scale. Information on soils are taken form an interpolation of the soil map...

Completed 02/01/1990 - 01/01/1991
51 MRCE/LTER Soil and Microbial Biomass Nitrogen

The data reported here are only for tabonuco forest at El Verde. Following plot setup and one year of pre-treatment measurements, Hurricane Hugo struck before the first planned fertilization. Because a year and a half of annual above ground litter inputs of phosphorus were dropped onto the...

Jean Lodge Completed 07/10/1990 - 08/01/1990
52 Above ground biomass in the Espiritu Santo landslide nearby the El Verde Field Station (ES-1)

To establish the dry mass of several species that grow on landslides. To make regressions of biomass against height and basal diameter. This way one can estimate biomass on permanent plots where one cannot harvest the plants.

Lawrence R. Walker Completed 04/27/1990
54 Shrimp populations in Quebrada Prieta (Pools 0, 8, 9, 15) (El Verde)

Freshwater shrimp from the Quebrada Prieta (a tributary to the Sonadora in the Espiritu Santu drainage, have been censused 6 times yearly since 1988. Atya lanipes, Xiphocaris elongata and Macrobrachium spp. are regularly captured and comprise the species in this data base.

Todd Crowl
Long-Term
Ongoing
01/01/1988 - 11/30/2011
55 Spatial and temporal differences in shrimp numbers (1 year, 20 pools)

We added woody debris to stream pools in three streams in an experiment designed to increase cover for freshwater shrimp. We trapped four species of freshwater shrimp during 4 months following wood additions. Stream pool morphology was estimated using maximum depth, surface area, and volume.

Alan Covich Completed 02/01/1995 - 05/01/1995
57 Tree damage by Hurricane Hugo on the Luquillo Forest Dynamics Plot (LFDP), Puerto Rico

Hurricane Hugo struck the Caribbean national forest in September 1989. Files LFDP_HURRDAM.TXT and LFDP_HURRDAMa.TXT contain data on the damage to trees caused by the hurricane collected by Mr. R. DeLeon between August 1990 and September 1991. Mr. DeLeon walked throughout the plot to find stems...

Completed 08/01/1990 - 09/01/1993
58 USGS Long-term daily streamflow data at several LEF locations

The daily data are summarized to monthly as follows:
Daily average CFS are summed for each month and multiplied by 86400 (seconds per day) to yield cubic feet per month. This value is divided by the particular watershed area and multiplied by another conversion factor to yield cm...

Nicholas Brokaw Completed 07/01/1945 - 09/30/1994
60 Tree Map for Census at the Luquillo Forest Dynamics Plot (LFDP), Puerto Rico

This data set shows the Tag number, Quadrat location, Species code, diameter and XY coordinates of stems >=10 cm D130 present at the time of Hurricane Hugo and in the first census. The data set is composed of two files both with the same file structure. In LFDP_C1treemap.txt the diameters (...

Completed 06/30/1990 - 08/20/1993
62 Canopy height profile starting 1992, 1994 and 1996 of the Luquillo Forest Dynamics Plot (LFDP), Puerto Rico

File LFDP_canopy contain the canopy heights for the Luquillo forest Dynamics plot. The first measurement started in 1992, and it was planned to measure the canopy height profile every 2 years. So far censuses starting in 1992, 1994, and 1996 have been completed. In the 1992 census the canopy...

Completed 04/09/1992 - 04/18/1997
70 USDC NOAA's National Climatic Data Center daily precipitation (5 stations)

Daily precipitation at five stations in or near the LEF have been compiled by the National Climate Data Center. Here, WE present monthly sums of precipitation (P, in cm). Data are summarized through July 1992. Station details are as follows:

...
Eda Melendez-Colom Completed 01/01/1931 - 07/31/1992
71 USDC NOAA's National Climatic Data Center daily maximum temperature (2 stations)

Maximum air temperature at two stations in or near the LEF have been compiled by the National Climate Data Center. Here we present monthly averages of the maximum air temperatures. Data are averaged per month through July 1992.
Station general details are as follows:

...
Eda Melendez-Colom Completed 01/01/1931 - 07/31/1992
72 USDC NOAA's National Climatic Data Center daily minimum temperature (5 stations)

Daily precipitation, maximum, and minimum air temperature at five stations in or near the LEF have been compiled by the National Climate Data Center. Here I present monthly sums of precipitation (P, in cm) and monthly averages (T, in oF) of the maximum and minimum air temperatures. Data are...

Eda Melendez-Colom Completed 01/01/1931 - 07/01/1992
75 Fern sporophyte growth observation at the Luquillo Experimental Forest (LEF)

Long-term (20-year) monitoring sites have been established in the Luquillo Experimental Forest. Individuals of approximately 20 species of ferns are being monitored on a regular basis to determine plant life history classes, leaf production rates, fertility characteristics and leaf damage levels...

Joanne Sharpe
Long-Term
Completed
09/01/1991 - 01/31/2010
76 Frog abundance infertilization plots

Population estimates and body sizes of E. coqui were collected on fertilization, litter removal, and control plots.

Lawrence L. Woolbright Completed 06/13/1993 - 06/27/1993
77 NADP/NTN precipitation chemistry data

We report here the chemistry of weekly wet-only rainfall from the Luquillo Experimental Forest (LEF) NADP station (code PR20) for the period February 1985 through December 1996. Our station was knocked out by Hurricane Hugo in September 1989, and not reestablished until May 1991. The station...

Alonso Ramirez
Long-Term
Completed
02/12/1985 - 12/30/1985
01/07/1986 - 12/30/1986
01/05/1987 - 12/29/1987
01/03/1989 - 12/26/1989
01/09/1990 - 12/25/1990
01/01/1991 - 12/30/1991
01/01/1992 - 12/29/1992
01/05/1993 - 12/28/1993
01/04/1994 - 12/27/1994
01/03/1995 - 12/26/1995
01/03/1995 - 01/23/1996
86 Fungi of the Greater Antilles

Over 20 researchers and cooperators were enlisted to produce a survey of the Basidiomycetes of Puerto Rico, the Virgin Islands, Dominican Republic, and Jamaica. This included all basidiomycetes fungi except rusts and smuts. These islands in the Greater Antilles were chosen for this survey for...

Long-Term
Completed
10/01/1983 - 01/29/2003
87 Germination in three R/FR light environments (El Verde)

Experiments were conducted in the Tabonuco forest at Luquillo Experimental Forest to determine the germination success of a number of species in different light environments. Species tested included: Byrsonima spicata, Calophyllum brasiliense, Carapa sp., Choven venosa, Guarea guidonia,...

Nicholas Brokaw Completed 02/28/1995 - 07/22/1995
88 Phenologies for the Tabonuco Forest trees and shrubs

These data are being used to, among other things, (1) determine the seasonality of flowering and fruiting in Tabonuco forest and test hypotheses concerning the causation of seasonality (or lack thereof), (2) test the effect of annual variation in rainfall and other climatic variables on seed and...

Long-Term
Ongoing
04/01/1992 - 12/19/2012
89 Long-term Intersite Decomposition Experiment (LIDET)

LIDET is the LTER Longterm Intersite Decomposition Experiment Team. It is a leaf, wood, and root decomposition study carried out at 28 LTER and other sites including LUQ. The duration of the study is designed to be approximately 10 yrs at temperate zone sites and approximately 3 yrs at tropical...

Jean Lodge Completed 09/12/1990 - 04/15/1993
90 Bisley Tower (TOWER I) Meteorological Station

Several meteorological parameters are being measured at Bisley since 1993. Correlations between elevation and stream-runoff and rainfall, elevation and air and soil temperature, and between trhoughfall and vegetation types have been found. These relationships are used inhydrologic and...

Grizelle Gonzalez
Long-Term
Ongoing
02/11/1993
91 Earthworms in tropical tree plantations and secondary forests

We compared patterns of earthworm abundance and species composition in tree plantations and secondary forests of Puerto Rico. Tree plantations included pine (Pinus caribaea Morelet) and mahogany (Swietenia macrophylla King) established in the 1930s, 1960s, and 1970s; secondary forests were...

Xiaoming Zou Completed 01/01/1994 - 05/01/1994
92 Earthworms in abandoned tropical pastures

Plant community succession alters the quantity and chemistry of organic inputs to soils. These differences in organic input may trigger changes in soil fertility and faunal activity. We examined earthworm density and community structure along a successional sequence of plant communities in...

Xiaoming Zou Completed 06/21/1993 - 07/28/1993
93 Litter decomposition of the tabonuco forest before hurricane Hugo

We examined forest structure, tree species composition, litterfall rate, and leaf litter decomposition in a mid-successional forest (MSF) and an adjacent mature tabonuco forest (MTF) in the Luquillo Experimental Forest of Puerto Rico. Whereas the MTF site received limited human disturbance, the...

Xiaoming Zou Completed 11/01/1980 - 10/31/1981
94 Litterfall of the tabonuco forest before hurricane Hugo

We examined forest structure, tree species composition, litterfall rate, and leaf litter decomposition in a mid-successional forest (MSF) and an adjacent mature tabonuco forest (MTF) in the Luquillo Experimental Forest of Puerto Rico. Whereas the MTF site received limited human disturbance, the...

Xiaoming Zou Completed 11/01/1980 - 10/31/1981
95 Litterfall along topographic gradients at lower Bisley

Litterfall (fine and coarse) due to Hurricane Hugo and subsequent fine annual litterfall inputs (1, 2 and 5 yr after Hugo) were determined for two sites (El Verde and Bisley) in the Luquillo Experimental Forest in Puerto Rico. Litter transfers into streams, riparian and upslope areas were...

Completed
08/28/1989 - 06/06/1992
06/13/1994 - 06/06/1995
96 Canopy invertebrate responses to Hurricane Hugo at several El Verde plots- LUQINVERT

Five tree species in 1991, six during 1992-1995, were selected to represent early and late successional forests at El Verde. These trees were sampled in both gap and non-gap plots resulting from Hurricane Hugo.

Timothy D. Schowalter
Long-Term
Completed
10/24/1991 - 06/02/2009
97 Sabana pasture permanent plot vegetation sampling

Permanent plot data is expected to show these temporal patterns: (1) rapid increases in percent cover and tree stem density, and (2) rapid turnover from early to late successional plant species. Plant-plant competition should show quick increases in intensity with native grass species...

Randall W. Myster Completed
11/16/1995 - 05/20/2003
11/16/1995 - 05/20/2003
08/31/2000 - 05/19/2003
11/10/2000 - 05/22/2003
09/14/2000 - 05/22/2003
11/29/2000 - 05/29/2003
98 Soil organic matter dynamics in the tabonuco forest, a plantation and a secondary forest in Guzman

In this project we try to find out the relationship between the primary production and the soil organic carbon fractions.

Xiaoming Zou Completed 07/01/1996 - 06/30/1997
99 Herbivory of eight common species at El Verde from 1994 to 1996

In seasonal and aseasonal tropical forests, leaf production is often highly synchronous, concentrating herbivore resources in only a few months. As a result levels of herbivory on young leaves can vary throughout the year. To determine the importance of food availability on herbivory...

Maria del Pilar Angulo Completed 11/01/1994 - 09/01/1996
100 El Verde Coffee Plantation permanent plot vegetation sampling

Permanent plot data is expected to show (1) rapid increases in percent cover and tree stem density, and (2) rapid turnover from early to late successional plant species. Plant-plant competition indices should show quick increases in intensity with exotics as top competitors which may lead to...

Randall W. Myster Completed 12/08/1998 - 10/28/1999
101 Ecuador old fields permanent plot vegetation sampling

Permanent plot data is expected to show these temporal patterns: (1) rapid increases in percent cover and tree stem density, and (2) rapid turnover from early to late successional plant species. Plant-plant competition should show quick increases in intensity with native grass species and...

Randall W. Myster
Long-Term
Ongoing
05/01/1998 - 05/01/2011
102 Leaf miners (Acrocercops sp.) larvae performance on young leaves of Manilkara bidentata

Manilkara bidentata is attacked by a specialist leaf miner(Acrocercops sp.(microlepidoptera:gracillariidae).  More than one larvae can be found per mine within a leaf. The purposes of this study is to determine the effect of group feeding for this species since larval...

Maria del Pilar Angulo Completed 04/04/1995 - 03/31/1996
103 Effect of plant density and light availability on leaf damage in Manilkara bidentata

Variation in herbivory is often associated with plant density and light environment. To determine the effect of these variables on herbivory we studied leaf production and herbivory on saplings, juveniles and adults of Manilkara bidentata (Sapotaceae) in the Luquillo Experimental Forest (LEF),...

Maria del Pilar Angulo Completed 04/01/1995 - 03/31/1996
104 Experimentally manipulated biota over a 30-40d period in two streams with distinctly different macrobiotic (Shrimp/Organic Matter/Ecology (1999))

Here we test the hypothesis that differences in macrobiotic assemblages can lead to differences in the quantity and quality of organic matter in benthic depositional environments among streams in montane Puerto Rico. We experimentally manipulated biota over a 30-40d period in two streams with...

Catherine Pringle Completed 06/20/1994 - 08/13/1994
105 Enclosure/exclosure experiments in a montane Puerto Rican stream examining direct and indirect effects of two dominant taxa of atyid (Atyidae) shrimp, Atya lanipes Holthius and Xiphocaris elongata Guerin-Meneville (Shrimp/ Algae/ Oecologia (1993))

Freshwater shrimp dominate the faunal biomass of many tropical headwater streams: however, their role in community organization is unclear. Enclosure/exclosure experiments in a montane Puerto Rican stream examined direct and indirect effects of two dominant taxa of atyid (Atyidae) shrimp, Atya...

Catherine Pringle Completed 02/23/1990 - 07/27/1990
106 Effects of biotic (shrimp) and abiotic (discharge) factors on the depositional environment quantified in a montane stream in Puerto Rico. (Shrimp/Algae/Can J. Fish Aquat. Sci. (1994))

Effects of biotic (shrimp) and abiotic (discharge) factors on the depositional environment were quantified in a montane stream in Puerto Rico. Electricity was used experimentally to exclude large (approximately >1cm in length) biota without artificially increasing sedimentation as in cage...

Catherine Pringle Completed 09/05/1992 - 08/13/1994
107 El Verde Grid long-term invertebrate data

The data set consists of 33 files: (1) abundance data for the walking stick, Lamponius portoricensis, (2) estimates of abundance (Minimum Number Known Alive) for 17 species of terrestrial snails, and (3) 31 files for each season containing data on size and mark-recapture estimates of population...

Long-Term
Ongoing
06/01/1991 - 05/23/2010
108 Patterns in soil and physical properties of the Bisley Watersheds 1 and 2 (Big Dig 1988, Big Dig 1990)

(1) Soil chemical (carbon, nutrients, aluminum, exchangeable acidity, and pH) and physical (bulk density) properties were measured systematically every 40 m on two 12 ha watersheds in Puerto Rico before and after Hurricane Hugo. Exchangeable cation concentrations were measured using different...

Whendee Silver Completed 06/01/1988 - 07/01/1990
109 Rio Icacos hyporheic and riparian chemistry

Hydrologic and chemical characteristics were determined for both riparian and hyporheic subsurface flow along a 100-m reach of a sandy-bottom tributary of the Rio Icacos in the Luquillo Experimental Forest, Puerto Rico. Hydrologic data (vertical hydraulic gradient and hydraulic conductivity...

Completed 01/28/2003 - 11/28/2007
110 Spatial Variation of Soil Carbon, Nitrogen and Phosphorus in the Luquillo Experimental Forest (LEF) (LEF_SOIL_CNP)

Hongqing Wang, a Ph.D graduate student of SUNY-ESF, with the help of many others, took soil samples in 119 locations over the entire Luquillo Experimental Forest (LEF) during the summer of 1998 and 1999. Soil organic carbon, total nitrogen and acid-extractable phosphorus were measured in the...

Charles A.S. Hall Completed
06/29/1998 - 07/15/1998
06/10/1999 - 06/15/1999
111 Litterfall in tabonuco (subtropical wet) forest in the Luquillo Experimental Forest, Puerto Rico (MRCE Litterfall data)

Treatments common to both sites are 1)quarterly fertilization (macro- and micronutrients) and 2) unmanipulated. At El Verde, a third set of plots was subjected to a one time removal of litter and woody debris generated by Hurricane Hugo (September 1989).

Table 1....

Alonso Ramirez
Long-Term
Ongoing
04/02/1990 - 12/28/2012
112 Landslide Removal Experiment vegetation cover and pole touches

The purpose of this data set is to document recovery of vegetation in removal plots in landslides in the Luquillo Experimental Forest (LEF.)

Lawrence R. Walker Completed 11/01/1997 - 05/31/2000
113 Seedling and sapling dynamics of treefall pits and undisturbed florest floor in El Verde, Puerto Rico

Seedling and sapling dynamics in a Puerto Rican rain forest were compared between forest understory and soil pits created by the uprooting of 27 trees during Hurricane Hugo. No difference in N and P levels were found in pit or forest soils under two trees with N-fixing symbionts (Inga laurina...

Lawrence R. Walker Completed 05/01/1991 - 05/23/1992
114 Rio Mameyes diatoms in the Rio Mameyes from 1998 to 2001

Survey expeditions of the diatoms of Puerto Rico and other Caribbean islands were conducted briefly in the late 1800's and early 1900's,. However, until now no intensive study of changes in freshwater diatom community over time has been undertaken. In conjunction with other measures of quality...

Brynne Bryan Completed 03/01/1998 - 05/31/1998
115 Short-term disappearance of foliar litter of three tree species native to rain forest of Puerto Rico

Litter disappearance was examined before (1989) and after (1990) Hurricane Hugo in the Luquillo Experimental Forest, Puerto Rico using mesh litterbags containing abscised Cyrilla...

Completed 02/06/1989 - 10/20/1990
116 Bromeliad chemistry at different elevations in the LEF

Mean concentrations of various nutrients in dried bromeliad leaf and in the coarse, medium and fine portions of debris retained by the bromeliad rosette.

Barbara A. Richardson Completed 02/01/1996 - 02/29/1996
117 Bromeliad plant collection details/data from different elevations in the LEF

Collection details of bromeliads collected for invertebrate community and diversity analysis from 4 localities in the LEF. Dates, location, plant size, amounts, pH and temp. of contained water, and weights of debris retained by the bromeliads.

Barbara A. Richardson
Long-Term
Ongoing
12/18/1993 - 02/28/2010
118 Species names and codes of the Luquillo Forest Dynamics Plot (LFDP), Puerto Rico

File LFDP_spp contains the...

Completed 02/01/1990 - 01/01/1992
119 Census of species, diameter and location at the Luquillo Forest Dynamics Plot (LFDP), Puerto Rico

File LFDP_CENSUS1 contains data for the Census 1 (Survey 1,2,and 3) of the LFDP including the Tag number Species code, quadrat location and date and stem diameter D130 (diameter measured at 130 cm from the ground (DBH). It also contains the diameter as recorded for all stems in survey 1, 2 and 3...

Long-Term
Ongoing
07/30/1990 - 10/29/2007
120 Shrimp populations variability in numbers and sizes in response to disturbance and seasons on 20 pools along the reach of Quebrada Prieta, Luquillo Experimental Forest

Shrimp populations were monitored at approximately 3 week intervals to determine the variability in numbers and sizes of each species in response to disturbance...

Nicholas Brokaw Completed 07/10/1990 - 08/01/1990
121 Fern distribution in El Verde MRCE plots

A fern survey was done of the plots established by under MRCE funding to assess controls on primary productivity along an elevational gradient. The control plots (CP), fertilized plots (FP) and plots where only leaf litter (ll) was removed at El Verde were survey and all ferns...

Joanne Sharpe Completed 10/11/1995 - 11/28/1995
122 Experimental Understory Food Web data in the El Verde area of the Luquillo Experimental Forest

These data include date, treatment, block number, number of coquies, number of anoles, number of insects collected on two sticky traps, number of insects counted on 4 Piper glabrescens and 4 Manilkara bidentata seedlings, percent herbivory on the aforementioned plants and number of...

Paul Klawinski Completed 09/01/1999 - 06/01/2000
123 Long-Term Elevation Plots (LTEP) (Altitudinal transects vegetation data along three rivers in the Luquillo Experimental Forest)

The composition of plant communities changes with elevation in the Luquillo Experimental Forest (LEF). The goal of this project is to document the patterns of these changes, and in particular, to determine whether the distributions of individual species are independent of one another, or whether...

Completed
09/17/2001 - 07/31/2002
09/17/2001 - 07/31/2002
09/17/2001 - 07/31/2002
09/17/2001 - 07/31/2002
124 Factors influencing decomposition of leaves for five plant species at El Verde

We evaluated the influences of leaf quality, climate and microsite on the decomposition of leaves of five tropical tree species. Single-species litterbags were used to determine weight loss during the first three months of decomposition in the Luquillo Experimental Forest, Puerto Rico....

Jean Lodge Completed 05/06/2000 - 11/17/2000
125 Interactions between plants and fungi and their roles in decay rates and CO2 release in five tropical leaf species

A microcosm experiment was used to test for the effects of interactions between particular plant and fungal decomposer species on rates of leaf decomposition. Each microcosm contained one species of leaf that was sterilized with gamma irradiation and then inoculated with a single fungus. Five...

Jean Lodge Completed 05/06/2000 - 11/17/2000
127 Meteorological data from El Verde Field Station: NADP Tower

Meteorological sensors are located at the top of a 20 m tower, the NADP Tower, behind the main buildings of El Verde Field Station, 350 masl. No large trees are present near the tower. Sensors are connected to a Campbell 10X data logger, with a storage module, and downloaded every two weeks...

Alonso Ramirez
Long-Term
Ongoing
01/01/2000 - 09/17/2012
128 Coarse Woody Debris in Bisley Experimental Forest and the Rio Icacos Basin

Organic matter pools appear to differ in composition between Bisley and Icacos. On average (n=30), 79% of Bisley organic matter was composed of coarse woody debris. Of the remaining 21...

Completed 02/26/2001 - 02/19/2002
129 Temperature and humidity in the LFDP (40 points)

This data set represents environmental variables collected to help interpret the distribution of plants and animals on the LFDP. Data are collected at each of 40 points designated as...

Robert B. Waide Completed 02/01/2000 - 01/01/2003
130 Heliconia invertebrate counts

Identification and number of invertebrates recovered from each Heliconia inflorescence sampled.

Barbara A. Richardson Completed 02/27/1996 - 03/01/1998
131 Bromeliad invertebrate counts at different elevations in the LEF

Identification and number of invertebrates recovered from each bromeliad sampled. Collection details of bromeliads collected for invertebrate community and diversity analysis from 3 elevations and forest types in the Luquillo Experimental Forest. Dates, location, plant size, amounts, pH and...

Barbara A. Richardson
Long-Term
Ongoing
12/01/1993 - 02/28/2010
132 Heliconia fluid and organic matter analyse

Mineral concentrations of Heliconia bract fluid and organic matter accumulated in the bracts. Data collected during a study of the invertebrates in Heliconia bract fluid.

Barbara A. Richardson Completed 03/03/1998 - 03/31/1998
133 Heliconia collection data

Collection details of Heliconia plants sampled, for a study of the invertebrate diversity of the fauna living in the floral bracts.

Barbara A. Richardson Completed 02/01/1996 - 03/01/1998
134 Invertebrate dry weight data in various locations, mostly within the LEF at El Verde

Contains information [identity, counts, size, fresh and dry weights] of various collections of invertebrates (and the occasional amphibian or reptile), which has allowed formulae describing the relationship between length and dry wt. of invertebrates to be obtained. These have been used in...

Michael J. Richardson Completed 01/01/1996 - 12/31/2006
135 Recovery of a tropical stream after a harvest-related chlorine poisoning event

1. Harvest-related poisoning events are common in tropical streams, yet research on stream recovery has largely been limited to temperate streams and generally does not include any measures of ecosystem function, such as leaf breakdown. 2. We assessed recovery of a second-order, high-gradient...

Effie A. Greathouse Completed 06/08/1999 - 07/29/1999
136 Bisley/Prieta Algae Monitoring

The LTER is conducting annual monitoring of Algae, Chlorophyll a, benthic organic matter, and benthic inorganic matter in order to document baseline stream characteristics. These data may be used to examine effects of disturbances such as hurricanes on stream ecosystems.

Catherine Pringle
Long-Term
Ongoing
06/01/2002 - 06/01/2010
137 Litter invertebrate communities at different elevations in the LEF

Identification and number of invertebrates recovered from each litter sample.

Barbara A. Richardson Completed 02/01/1999 - 02/28/2001
138 Conservation and management of migratory fauna and dams in tropical streams of Puerto Rico

1. Compared to most other tropical regions, Puerto Rico appears to have dammed its running waters decades earlier and to a greater degree. The island has more large dams per unit area than many countries in both tropical and temperate regions (e.g., 3x that of the U.S.), and the peak rate of...

Effie A. Greathouse Completed 06/22/1993 - 06/30/2003
139 Indirect upstream effects of dams: consequences of migratory consumer extirpation in Puerto Rico

Large dams degrade the integrity of a wide variety of ecosystems, yet direct downstream effects of dams have received the most attention from ecosystem managers and researchers. We investigated indirect upstream effects of dams resulting from decimation of migratory freshwater shrimp and fish...

Effie A. Greathouse Completed 06/01/2008 - 06/03/2008
140 Neritina snails upstream migrations at the intersection of Rio Mameyes with road PR Route 3 (bridge 1771)

This data set includes N. virginea densities and sizes from two channels in lower Rio Mameyes under PR Route 3 bridge during the upstream migration season Aug-Dec 2000. Microhabitat use (near-bed water velocities and depth) within both channels is also included. Massive migrations in long trails...

Juan Felipe Blanco Completed 05/09/2000 - 06/30/2002
141 Neritina snails hierarchical distribution

This data set includes N. virginea densities and sizes relative to streambed substrate type, water depth, and habitat type in a low land reach in Río Mameyes near PR Route 3 bridge, and presence and inland extent of distribution of in 32 coastal rivers around the island. Hydrologic and water...

Juan Felipe Blanco Completed 08/22/2000 - 01/09/2003
142 Does the River Continuum Concept apply on a tropical island? Longitudinal variation in a Puerto Rican stream

We examined whether a tropical stream in Puerto Rico matched predictions of the River Continuum Concept (RCC) for macroinvertebrate functional feeding groups (FFGs). Sampling sites for macroinvertebrates, basal resources, and fishes ranged from headwaters to within 2.5 km of the fourth-...

Effie A. Greathouse Completed 06/01/2001 - 08/01/2001
143 Canopy Trimming Experiment (CTE) plant seedling measurements

Seedlings were measured before and after treatments to determine how alterations in canopy openness and detritus affect seedling densities and life histories (growth, mortality, recruitment). It was predicted that plots experiencing canopy openness with detritus removed would have the...

Jess Zimmerman
Long-Term
Ongoing
06/05/2003 - 10/17/2011
144 Canopy Trimming Experiment (CTE) plants greater than 1 centimeter diameter at breast height (DBH)

Plant diameters and growth measurements were taken both before and after treatments to determine how alterations in canopy openness and detritus affect measures of growth, mortality, and production. Both types of trimmed plots are predicted to have relatively quick evidence of re-...

Jess Zimmerman
Long-Term
Ongoing
03/01/2003 - 02/07/2011
145 Canopy Trimming Experiment (CTE) Litter decomposition and Connectivity basket data

This experiment was designed to decouple the effects of canopy opening from those of increased detrital inputs on rates of detrital processing and resultant community and ecosystem processes. In a study initiated after massive inputs of organic matter from Hurricane Georges in 1998, the forest...

Jean Lodge
Long-Term
Ongoing
07/05/2005 - 01/22/2007
146 Canopy Trimming Experiment (CTE) Fern surveys

Changes in fern diversity and abundance were monitored prior to and during the Canopy Trimming Experiment (CTE). The abundance of all terrestrial fern species on the CTE plots is recorded for each subplot at annual intervals in January. The fern abundance and diversity changes in response to...

Joanne Sharpe
Long-Term
Completed
01/13/2003 - 01/15/2008
147 Meteorological data from several climate stations in the northeast section of the Luquillo Experimental Forest

Electronic sensors are placed at the field location to support other activities. Data set includes measurementes from several climate stations in the northeast section of the Luquillo Experimental Forest. These stations are surround the Bisley Experimental watersheds and the Sabana Field Station...

Long-Term
Ongoing
01/01/2002 - 12/31/2009
148 Bisley rainfall and throughfall, and chemistry of rainfall and throughfall

Rainfall and throughfall are collected weekly at the Bisley LEF site. These data sets begin March 1988 and ends December 2003.

Rain and throughfall samples are the total catch for the week, and are exposed to field conditions for that time. No event sampling is conducted on a...

Long-Term
Ongoing
03/08/1988 - 12/31/2008
149 Effects of a tropical stream poisoning: do they reflect effects of small-scale experiments?

Small-scale experiments in tropical streams have suggested that freshwater shrimps play a critical role in determining the quality and quantity of benthic organic matter and overall nutrient dynamics. We quantified the effects of a whole-reach shrimp poisoning event in the Sonadora, a...

Effie A. Greathouse Completed 03/26/1999 - 04/06/1999
150 Pattern morphology for frogs captured at 9 locations in northeastern Puerto Rico over a 25-year period from 1978 to 2002

We recorded the pattern morph for 9,950 frogs captured at 9 locations in northeastern Puerto Rico over a 25-year period from 1978 - 2002. Data revealed 21 distinct pattern morphs including a variety of stripes, bars, and spots. Analysis of morph frequencies between plots showed significant...

Lawrence L. Woolbright Completed
01/01/1987 - 08/02/2002
06/01/1988 - 08/01/2002
01/01/1984 - 01/31/1984
151 Neritina snails responses to channel realignment

This data set includes N. virginea densities and sizes relative to streambed substrate type, water depth, and near-bed water velocity in three sites in a low land segment in Río Mameyes near PR Route 3 bridge: 1) 50 m upstream from bridge, 2) immediately downstream from bridge, and 3) 200 m...

Juan Felipe Blanco Completed 08/22/2000 - 12/05/2003
152 Canopy Trimming Experiment (CTE) Snail data

The objective of these data is to determine how green litter deposition and canopy opening associated with a hurricane independently and jointly affect population dynamics and community composition of terrestrial gastropods. Because canopy openness can be expected to increase abiotic stress on...

Long-Term
Ongoing
07/29/2003 - 07/12/2010
153 STREAMS Project: Emergent landscape patterns in stream ecosystem processes resulting from groundwater/surface water interactions

This Data Set is hosted by the Luquillo LTER Program (LUQ) and owned by a LUQ's investigator.

Our primary objective is to understand the linkage between surface-subsurface water interactions and ecosystem processes in neotropical lowland streams over an extended time frame (>25 yrs)....

Long-Term
Ongoing
05/19/1988 - 12/05/2008
154 Soil factors predict initial plant colonization on Puerto Rican landslides

Tropical storms are the principal cause of landslides in montane rainforests, such as the Luquillo Experimental Forest (LEF) of Puerto Rico . A storm in 2003 caused 30 new landslides in the LEF that we used to examine prior hypotheses that slope stability and organically enriched soils are...

Aaron Shiels Completed 04/01/2003 - 03/31/2006
155 Canopy Trimming Experiment (CTE) Canopy invertebrate responses to disturbance

Seven tree species were selected to represent early (Cecropia, Prestoea) and late (Dacryodes, Manilkara, Sloanea) successional, and overstory (Cecropia, Dacryodes, Manilkara, Sloanea) and understory (Prestoea, Miconia, Psychotria), species in forests at El Verde. These trees were sampled in...

Timothy D. Schowalter
Long-Term
Ongoing
07/01/2003 - 06/02/2009
156 Daily streamflow (Bisley area, 5 stations: Q1, Q2, Q3, Sabana, Puente Roto)

The daily data are summarized to monthly as follows:
Daily average CFS are summed for each month and multiplied by 86400 (seconds per day) to yield cubic feet per month. This value is divided by the particular watershed area and multiplied by another conversion factor to yield cm...

Grizelle Gonzalez
Long-Term
Ongoing
01/03/1987 - 05/09/2010
157 Canopy Trimming Experiment (CTE) litterbag invertebrate counts and weights data

Identification, number and dry weight of invertebrates recovered from each litterbag.

Barbara A. Richardson Completed 08/26/2005 - 01/22/2007
158 Physical and chemical attributes of Quebrada Prieta, Bisley 3, Bisley 5, and Toronja related to of shrimp populations measurements

Physical parameters, densities and sizes of two species of freshwater shrimps (Atya lanipes and Xiphocaris elongata) in four headwater streams (Quebrada Prieta, Toronja,...

Alan Covich Completed 01/01/1988 - 12/31/2005
160 Canopy Trimming Experiment (CTE) Microbial EL-FAME Data

The canopy trimming experiment at El Verde simulates some aspects (canopy openness and biomass redistribution) of hurricane disturbances. Soil samples and leaf litter were gathered from three replicate blocks, each with four treatment plots in Tabonuco Forest at in El Verde....

Completed 11/02/2002 - 03/31/2006
161 Bromeliad invertebrates at different elevations in Dominica

Collection details of bromeliads collected for invertebrate community and diversity analysis from 3 localities in Dominica. Dates, location, plant size, amounts, pH and temp. of contained water, weights of debris retained by the bromeliads, and counts of organisms, identified to species...

Barbara A. Richardson Completed 02/14/2002 - 02/23/2002
163 Patterns in litterfall production from 12 forested sites along an elevation gradient in Pico del Este

We measured litterfall from 12 sites along an upper elevation gradient every two weeks from 1994 to present. Samples are being used to estimate the litterfall productivity over time and space, identify the impacts of periodic events, and help us understand the drivers of ecosystem and...

Whendee Silver
Long-Term
Completed
07/26/1994 - 08/24/2004
164 Canopy Trimming Experiment (CTE) trace gases

This data set provides the monthly trace effluxes measured across the soil-atmosphere interface from five soil surface chambers in all the CTE plots.

Whendee Silver
Long-Term
Ongoing
09/07/2004 - 02/01/2011
165 Canopy Trimming Experiment (CTE) PlotTreatments

The Luquillo Experimental Forest LTER program in Puerto Rico was initially focused on the understanding of the effects that two major hurricanes, Hugo in 1989 and George in 1998, had on the structure and function of a tropical mountain forest and how the biota responded to these disturbances....

Long-Term
Ongoing
10/26/2004 - 01/20/2005
01/24/2005 - 03/17/2005
03/22/2005 - 06/16/2005
166 Chemistry of soil solution collected from zero tension lysimeters in the Canopy Trimming Experiment (CTE) plots

Soil solution chemistry: Soil solution was collected monthly from zero tension lysimeters installed in the CTE plots. Sampling began prior to cutting the canopy and continue to the present.

William H. McDowell
Long-Term
Completed
01/28/2003 - 11/28/2007
167 Urban-Rural Temperature Data

Our objective in this study is to quantify the UHI created by the San Juan Metropolitan Area over space and time using temperature data collected by mobile and fixed-station measurements. We used the fixed-station measurements to examine the relation between average temperature at a given...

David Murphy Completed 06/26/2006 - 07/05/2006
168 2004 Estuarine Fish Sampling - Managing freshwater inflow to estuaries in northeast Puerto Rico

Chapter 1 (fish community data): Historical data are often one of the only resources for documenting and assessing causes of environmental change, particularly in developing regions where funding for ecological studies is limited. In this study, previously unpublished data from...

Katherine Smith Completed 06/01/2004 - 08/31/2004
169 Flooded forest plot sampling in Peru

In order to better understand how flooding and gap formation affect Amazonian rainforests, I set up plots both in three major forest types that differed by flooding duration (referred to here as dry, wet, very wet) and in their respective gaps.

Randall W. Myster Completed 05/01/1999 - 05/01/2002
170 Phrynus habitat selection

This data set comprises a single data file, which contains data on the abundance and distribution of the whipspider Phrynus longipes on the Luquillo Forest Dynamics Plot in July 2001.

Christopher P. Bloch Completed 07/14/2011
171 Sonadora Elevational Biodiversity (Gastropods)

The data set includes 3 files that contain abundance data for terrestrial gastropods along an elevational gradient within the Sonadora River watershed. Two files (1 and 2) contain data from the same transect but differ in the year during which they were collected (2007 and 2008). The third file...

Completed 07/11/2007 - 07/25/2008
172 Flooded forest plot sampling in Ecuador

In order to better understand how flooding and gap formation affect Amazonian rainforests, I set up plots both in three major forest types that differed by flooding duration (referred to here as dry, wet, very wet) and in their respective gaps.

Randall W. Myster Completed 05/13/2010 - 06/16/2010
173 Bird abundance – mist nets

This project seeks to measure long-term trends and variability in bird populations in tabonuco forest at El Verde. Repeated measures of bird populations using mist nets are conducted annually in the Luquillo Forest Dynamics Plot. For each bird caught, I obtain physical measurements (weight,...

Robert B. Waide Completed 06/04/1990 - 05/23/2005
174 Chemistry of rainfall and throughfall from El Verde and Bisley

Rain, throughfall, and stream water are collected weekly at the LEF sites listed below. These data sets begin as early as 1983; LTER sampling began in 1988.

Rain and throughfall samples are the total catch for the week, and are exposed to field conditions for that time. No...

William H. McDowell
Long-Term
Ongoing
11/21/1983 - 02/23/2010
175 LFDP phenology plot seedlings – 16 ha plot

These data on temporal and spatial patterns of seedling recruitment in conjunction with data on flower and seed rain production allow tests of hypotheses concerning causes of inter-annual variation and roles of different mechanisms in facilitating species coexistence. The data are being used to...

Ongoing 03/22/2007 - 06/20/2012
176 Lotic Intersite Nitrogen eXperiment I (LINX1): Stream nitrogen (N) dynamics in streams on the eastern side of Puerto Rico

This study was part of the Lotic Intersite Nitrogen eXperiment (LINX); a series of identical 15NH4 tracer additions to streams throughout North America. 15NH4Cl was added at tracer levels to a Puerto Rican stream for 42 days. Samples were collected from selected food web and dissolved...

Completed 01/15/1998 - 03/19/1998
177 Lotic Intersite Nitrogen eXperiment II (LINX2): Stream nitrogen (N) dynamics in streams on the eastern side of Puerto Rico

Stream nitrogen (N) dynamics were studied in streams on the eastern side of Puerto Rico. Rates of nitrate uptake and denitrification were measured in nine tropical low-order streams with contrasting land use as part of the Lotic Intersite Nitrogen eXperiment II (LINX II) in Puerto Rico using...

William H. McDowell Completed 02/04/2004 - 02/23/2006
179 Elevation Gradient (EG) Soil Microbial diversity FAME and TRFLP data in the Canopy Trimming Experiment Plots

Soil fungal communities respond to multiple abiotic and biotic factors that change along elevation gradients. The limited information available on fungi and microbial processes along elevation gradients is primarily from temperate areas and very few from tropical regions. This study documents...

Sharon Cantrell
Long-Term
Completed
03/01/2003 - 12/31/2004
180 Canopy Trimming Experiment (CTE) Microbial diversity DNA data

Hurricanes are common disturbances in the Caribbean region that affect tree distribution, species diversity and biomass in forests. Little is known of how microbial communities in soil and litter are affected by natural or anthropogenic disturbances. The objective of our study was to determine...

Sharon Cantrell
Long-Term
Completed
07/05/2006 - 07/13/2006
181 Maximum temperature at El Verde Field Station, Rio Grande, Puerto Rico from January 1975 to August 1992

Daily emperature has been measured at the El Verde Field Station since 1975 (see methods). Average record show that maximum values for maximum temperature recorded from May to October with a range from 29 to 30 and peaks of 29.7 Centigrade in October. The months of October through December show...

Alonso Ramirez
Long-Term
Ongoing
01/01/1975 - 08/31/1992