LUQ LTER DATA SETS DOCUMENTATION FORM
ON-LINE VERSION
A DATA SET is a series of observations collected by the same methodology. Each data set should have documentation sufficient for someone unfamiliar with the research to replicate the study. Data sets may be broken into subsets (data files) that are discrete in space and time, in that order. The documentation for a data set should include all spatial and temporal subdivisions of the data.
(Data, Abstract, Methods, Variables)
NOTES:
PERSON(S) COMPLETING THIS FORM: E-MAIL ADDRESS:
|
Gail A. Blake |
|
|
Eda C. Melendez-Colom |
DATA SET IDENTIFIER: 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))
PROJECT TITLE: Influence of Decapods on Ecosystem Processes
PROJECT DESCRIPTION: Three experiments were performed to study the influence of decapods on ecosystem processes. In the first one (catalogued as LTERDBAS #104) the hypothesis that differences in macrobiotic assemblages can lead to differences in the quantity and quality of organic matter in benthic depositional environmentsamong streams in montane Puerto Rico was tested. The experimental results were consistent with findings of an independent survey of six streams in four different drainages. Four streams that had an abundance of omnivorous shrimps but lacked predaceous fishes, had extremely low levels of fine benthic organic and inorganic material. In contrast, two streams that had low densities of shrimps and contained predaceous fishes had significantly higher levels. Results showed a strong linkage between species and ecosystem characteristics: interstream differences in the quantity and quality of fine benthic organic matter resources were determined by the nature of the macrobiotic assemblage. Furthermore, patterns in the distribution of shrimp assemblages reflected landscape patterns in the benthic depositional environment among streams.
In the second experiment (LTERDBAS #105) the role of freshwater shrimp, which dominate the faunal biomass of many tropical headwater streams, was studied. The enclosure/exclosure experiments in a montane Puerto Rican stream the direct and indirect effects of two dominant taxa of atyid (Atyidae) shrimp, Atya lanipes Holthius and Xiphocaris elongata Guerin-Meneville was examined. Both shrimp taxa caused significant reductions in sediment cover on rock substrata, reducing sedimentation and enhancing algal biovolume on clay tiles in cages.We evaluated the mechanism by which A. lanipes influences algae and benthic insects by comparing patterns of algal biomass, taxonomic composition and shrimp-presence treatments both with and without manual sediment removal. The shrimp exclusion treatment without manual sediment removal had significantly lower algal biomass and greater sedimentation than all other treatments. The treatment in which shrimp were excluded but sediment was manually removed, however, accrued almost the same algal biovolume as the shrimp enclosure treatment, supporting the hypothesis that sediment removal enhances the biovolume of understory algal taxa.
The effects of biotic (shrimp) and abiotic (discharge) factors on the depositional
environment were quantified in a montane stream in Puerto Rico in a third
experiment (LTERDBAS #106). Electricity was used experimentally to exclude
large (approximately >1cm in length) biota without artificially increasing
sedimentation as in cage enclosure/exclosure experiments in stream systems.
Unelectrified control substrata had natural high densities of atyid shrimp.
Atyid shrimp can significantly affect the accumulation of organic and inorganic
materials on rock substrata in stream pools between high-discharge events.
LTER CORE AREAS: (Annotate all that apply)
|
Population Dynamics |
LEF LTER 1 RESEARCH TOPIC: (Annotate all that apply)
|
Spatial and Temporal Distribution of Populations |
We define a data file as a component of a data set. A data set can have
only one data file or more. Basically, different data files have different data
structures or format.
DATA SET FILES (SUBSETS):
|
Data File No. |
Data File Identifier |
On-Line Filename |
Starting Date |
Periodicity of sample |
End Period |
|
1
|
Total dry mass of sediment and percentage organic
matter in control and electrified shrimp exclusion treatments after 0,
1, 2, 4, 5, and 8 days (Fig2)
|
September 5, 1992 | once | September 14, 1992 | |
|
2
|
Total dry mass of sediment and electrified shrimp
exclusion treatments and on rocks located outside the treatments at 6,
12, and 30h following a storm event (Fig3)
|
September 5, 1992 | once | September 14, 1992 | |
|
3
|
The total algal biovolume for each taxon for the
each three sampling of the electro control and the electro exclusion
experiments (Fig4) |
September 5, 1992 | once | September 14, 1992 |
RESEARCH LOCATION:
INVESTIGATORS:
PRINCIPAL INVESTIGATORS E-MAIL address
|
Catherine M. Pringle |
OTHER RESEARCHERS E-MAIL address
|
Gail A. Blake |
CONTACT PERSONS E-MAIL address Phone Number (Include area code)
|
Catherine M. Pringle |
(706) 542-1120 |
SOURCE OF FUNDING (SPONSOR): NSF BSR-91-07772
DATA SET METHODS: Electric exclosure devices were constructed to exclude large (approximately >1 cm) invertebrates from foraging on rock substrata in a shaded pool (approximately 3.5 m length X 2.3 m width) of the Quebrada Toronja. Treatments were designed to either exclude or allow access to shrimp or other relatively large organisms such as crabs and fish. For more detailed methodology see publication.
REFERENCES:
STORAGE SITES: DM Cabinet DM003 Drawer 3
LEF LTER OFFICIAL KEYWORDS (See
table): Q TORONJA, RIVER, SEDIMENTATION, DECAPODS, PEER REVIEWED
JOURNAL
PUBLICATIONS:
Pringle, C.M., Blake, G.A. (1994) Quantitative effects of atyid shimp
(Decapoda: Atyidae) on the depositional environment in a tropical stream:
use of electricity for experimental exclusion. Can. J. Fish. Aquat. Sci. 51:
1443-1450
DISSEMINATION: UNRESTRICTED
REASONS TO RESTRICT DATA IN THIS DATA SET BEYOND ITS TWO YEAR POLICY PERIOD*:
*WILL HAVE TO BE APPROVED BY LTER PRINCIPAL INVESTIGATORS: J. ZIMMERMAN, A. LUGO , D.J. LODGE
SITES DESCRIPTIONS: The experiments were carried out in pools of the stream Toronja. 32cm in diameter rings were placed in the stream. The control hoops were not electrified while the exclusion hoops were.
Geographical positional system (GPS) Coordinates for each location:
|
location |
latitude |
longitude |
|
FILE NAME OR #ABOVE (all in which the variable appears) |
1,2 | 1 | 1,2 | 1 | 1 |
|
ABBREVIATION (as it appears on the data file) |
TREATMENT | DAY | ALGAL_BIOVOLUME_G/M2 | TOTAL_MINERAL_G/M2 | TOTAL_ORGANIC_G/M2 |
|
NAME OF VARIABLE |
Type of treatment | Sampling date | Weight of total algal biovolume | Weight of total mineral content | Weight of total organic content |
|
DEFINITION OF VARIABLE |
States whether it is a control or a electro exclusion experiment | The day which the sampling took place | States the weight of total algal biovolume for a defined area | States the weight of total mineral content for a defined area |
States the weight of total organic content for a defined area |
|
UNIT |
N/A | N/A | g/m2 | g/m2 | g/m2 |
|
PRECISION |
Absolute | Absolute | If the same sites and similar sampling
methods are employed the experiment should be replicable |
If the same sites and similar sampling
methods are employed the experiment should be replicable |
If the same sites and similar sampling
methods are employed the experiment should be replicable |
|
RANGE OR LIST OF VALUES |
{control, exclusion} | {0 ,..., 8} | {0,..., 681.0} | {0 ,.., 974.8} | {0.9,..., 156.8} |
|
DATA TYPE |
Alphanumeric | Integer | Real |
Real |
Real |
|
MISSING DATA CODES |
none | none | none |
none |
none |
VARIABLES (ATTRIBUTES):
|
FILE NAME OR #ABOVE (all in which the variable appears) |
1
|
1 | 2 | 3 | 3 |
|
ABBREVIATION (as it appears on the data file) |
SUSPENDED_SOLIDS_G/L | GAUGE_HEIGHT_CM | TIME (HR) | TAXON | EXCLUSION1 |
|
NAME OF VARIABLE |
Amount of suspended solids |
Depth of the poo | Sampling time passed after storm | Algae taxon | Exclusion experiment first sampling total algal biovolume |
|
DEFINITION OF VARIABLE |
States the the amount of suspended solids in a liter of water from the stream pool |
The depth of the pool in centimeters | States how many hours after a storm the data was taken | The taxon of the algae collected | The total algal biovolume for each taxon for
the first sampling of the electro exclusion experiment |
|
UNIT |
g/liter | cm | hours | N/A | g/m2 |
|
PRECISION |
idem | Absolute | Absolute | Absolute | If the same sites and
similar sampling methods are employed the experiment should be replicable |
|
RANGE OR LIST OF VALUES |
{0.0042,..., 0.022} | {30.5 ,.., 37} | {6,...,30} | {0,..., 321.2} | |
|
DATA TYPE |
Real | Real | Integer |
Alphanumeric |
Real |
|
MISSING DATA CODES |
none | none | none |
none |
blank |
VARIABLES (ATTRIBUTES):
|
FILE NAME OR #ABOVE (all in which the variable appears) |
3 | 3 | 3 | 3 | 3 |
|
ABBREVIATION (as it appears on the data file) |
EXCLUSION2 | EXCLUSION3 | CONTROL1 | CONTROL2 | CONTROL3 |
|
NAME OF VARIABLE |
Exclusion experiment second sampling total algal biovolume |
Exclusion experiment third sampling total algal biovolume |
Control experiment first sampling total algal biovolume |
Control experiment second sampling total algal biovolume |
Control experiment third sampling total algal biovolume |
|
DEFINITION OF VARIABLE |
The total algal biovolume for each taxon for
the 2nd sampling of the electro exclusion experiment |
The total algal biovolume for each taxon for
the 3rd sampling of the electro exclusion experiment |
The total algal biovolume for each taxon for
the 1st sampling of the electro control experiment |
The total algal biovolume for each taxon for
the 2nd sampling of the electro control experiment |
The total algal biovolume for each taxon for
the 3rd sampling of the electro control experiment |
|
UNIT |
g/m2 | g/m2 | g/m2 | g/m2 | g/m2 |
|
PRECISION |
idem | idem | idem | idem | idem |
|
RANGE OR LIST OF VALUES |
{0,..., 350.3} | {0,..., 304.3} | {0,..., 304.3} | {0,..., 183.4} | {0,..., 156.2} |
|
DATA TYPE |
Real | Real | Real |
Real |
Real |
|
MISSING DATA CODES |
blank | blank | blank |
blank |
blank |
COMPUTATIONAL METHODS:
| Variable Name | Formula |
FOR DATA MANAGER USE ONLY
DATE OF LAST REVIEW: January 25, 2006
NAME OF ON - LINE CATALOG :LTERDBAS
RECORD #: 106
DOCUMENT TYPE:
PRIORITY TO BE ENTERED: N/A
Rev. date of this form: 8 June 2001