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:  

Effie Greathouse

effieg@uga.edu

DATA SET IDENTIFIER :  Recovery of a tropical stream after a harvest-related chlorine poisoning event

PROJECT TITLE :   Effects of and recovery from chlorine poisoning, Quebrada Sonadora (Fresh Water Shrimp Recovery from Poisoning)

PROJECT DESCRIPTION : Quebrada Sonadora was poisoned with chlorine bleach 140 m upstream from the bridge of Road 186 in the LEF causing massive mortality of freshwater shrimps over a ~500 m reach (300 m a.s.l., Fig. 1). The poisoning was discovered on 12 March 1999 and was estimated to have occurred on 10 March, based on the state of decay of thousands of dead shrimps observed along the river. No carcasses of Sicydium plumieri were observed. While no bleach bottles were found at the site of this poisoning, bleach bottles have been found at other stream poisonings documented in the LEF, and locals report that swimming pool tablets are also sometimes used in illegal chlorine poisonings. Chlorine is known to display rapid volatilization, transformation, and flushing in lotic waters; thus, LEF chlorine poisonings are pulse disturbances. When the poisoning was discovered, the benthos in pools of the poisoned reach was visibly and dramatically different than the pool benthos upstream. In downstream pools, shrimps were not observed, and thick layers of sediment and fine particulate organic matter (FPOM) coated the rocks. In pools upstream from the poisoning, xiphocaridid and atyid shrimps were active, and no visible sediment/FPOM was observed on rocks. In contrast, there were no pronounced differences in sediment/FPOM accrual between riffles above and below the poisoning. These visual observations of immediate effects suggested that the poisoning event represented a unique opportunity to quantify large-scale effects of shrimp removal for comparison to previous small-scale manipulative experiments conducted in the Sonadora and tributaries (Prieta, Toronja). In the first component of this project, from March 26 to April 6, 1999, we quantified differences between the first 100 m of the poisoned reach and a 100-m reference reach immediately upstream from the poisoned reach, and we conducted a manipulative experiment, adding freshwater shrimps (Xiphocaris elongata, Atya lanipes, Macrobrachium spp.) to 3 poisoned pools for comparison to 3 poisoned pools in which no shrimps were added.

In the second component of this project, from June 15 to July 28, 1999, we assessed recovery of the poisoned reach, comparing the upper 315 m of the poisoned reach to a 250-m reference reach immediately upstream from the poisoning.

LTER CORE AREAS:Annotate all that apply

Disturbance Patterns

LEF LTER 1 RESEARCH  TOPIC:  (Annotate all that apply)

Disturbance Recovery-Env. Props.

Data File No.

Data File Identifier

On-Line Filename

Starting Date

Periodicity of sample

End Period

1 Physical parameters and the number and mean lengths of trapped shrimps from 15 recovery study pools recovphys&shrimps.txt June 8, 1999 once July 29, 1999
2 Observations on shrimps and gobies from 15 recovery study pools recovobs.txt June 23, 1999 variable July 29, 1999
3 Chlorophyll a, inorganic and organic matter accruing on tiles placed in 15 recovery study pools recovtiles.txt June 26, 1999 variable during a 24-days period July 18, 1999
4 Leaf mass remaining and invertebrates on leaf packs placed in 15 recovery study pools recovleaves.txt June 15, 1999 variable during a 15-days period July 5, 1999

RESEARCH LOCATIONS: Quebrada Sonadora, at the El Verde Field Station and the 186 bridge; Quebrada Sonadora is located in the Espiritu Santo drainage.

INVESTIGATORS:

PRINCIPAL INVESTIGATORS

E-MAIL address

Catherine M. Pringle

cpringle@uga.edu

Other Researchers

E-MAIL address
Effie A. Greathouse effieg@uga.edu
Nina Hemphill
  
Ernesto Garcia  
William H. McDowell bill.mcdowell@unh.edu
James G. March march@sparc.ecology.uga.edu
Alonso Ramirez alonso@ites.upr.edu

CONTACT PERSONS  

E-MAIL address

Phone Number(Include area code)

Effie A. Greathouse

706-542-1120

effieg@uga.edu

SOURCE OF FUNDING (SPONSOR): Luquillo LTER (BSR-8811902, DEB 9411973, DEB 0080538, DEB 0218039), USDA Forest Service (10-21-RR551-112)

DATA SET ABSTRACT: 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 stream draining the Luquillo Experimental Forest, Puerto Rico, three months after a chlorine-bleach poisoning event. The illegal poisoning of freshwater shrimps for harvest caused massive mortality of shrimps and dramatic changes in those ecosystem properties influenced by shrimps. We determined recovery potential using an established recovery index and assessed actual recovery by examining whether the poisoned reach returned to conditions resembling an undisturbed upstream reference reach.
3. Recovery potential was excellent (score=729 out of a possible 729) and can be attributed to nearby sources of organisms for colonization, the mobility of dominant organisms, unimpaired habitat, rapid flushing and processing of chlorine, and location within a national forest.
4. Actual recovery was substantial. Comparison of the reference reach with the formerly poisoned reach indicated: (1) complete recovery of xiphocaridid and palaemonid shrimp population abundances, shrimp size distributions, leaf breakdown rates, and abundances of oligochaetes and mayflies on leaves, and (2) only small differences in atyid shrimp abundance and community and ecosystem properties influenced by atyid shrimps (standing stocks of epilithic fine inorganic and organic matter, chlorophyll a, and abundances of chironomids and copepods on leaves).
5. There was no detectable pattern between any measured variables and distance downstream from the poisoning. However, shrimp size-distributions indicated that the observed recovery may represent a source-sink dynamic, in which the poisoned reach acts as a sink which depletes adult shrimp populations from surrounding undisturbed habitats. Thus, the rapid recovery observed in this study is consistent with results from other field studies of pulse chlorine disturbances, harvest-related fish poisonings, and recovery of freshwater biotic interactions, but it is unlikely to be sustainable if multiple poisonings deplete adult populations to the extent that juvenile recruitment does not offset adult shrimp mortality.

DATA SET METHODS: From 15 June to 28 July, 1999, we assessed recovery of shrimp, fish and leaf pack invertebrate abundances, shrimp size distributions, algal colonization, accrual of fine particulate inorganic and organic matter, and leaf decomposition rates in pool habitats of the upper 315 meters of the 500-m reach affected by the March 1999 poisoning of the Sonadora. We used a 250-meter reach upstream from the poisoning as a reference reach for comparison to the formerly poisoned reach. Five reference pools and ten formerly poisoned pools were chosen for study.
In each pool, we haphazardly placed 6 unglazed ceramic tiles (7 x 15 cm) and 6 leaf packs, each tethered to cobble from the channel with cable ties and metal binder clips. Leaf packs were made from air-dried leaves of Cecropia schreberiana Miq. cut into smaller pieces, weighed to approximately 5 g, and held together with a binder clip. In the two most upstream study pools of the formerly poisoned reach, tiles and leaf packs were disturbed by swimmers (i.e. picked up and tossed). Tiles and leaf packs in the third study pool of the formerly poisoned reach suffered high washout during a storm 2 days after placement. The seven other study pools in the formerly poisoned reach were below the Road 186 bridge crossing of the Sonadora but similar to the pools of the upstream reference reach in physical parameters.
We randomly sampled, from each study pool, one tile on days 11, 16, 20, 25, and 34 and one leaf pack on days 6, 11, 14, 16 and 20. We also sampled 25 leaf packs on day 0 to obtain an air-dried to oven-dried ratio in order to convert the original air-dried weight of each leaf pack to an estimated oven-dried weight. We sampled tiles and leaf packs by cutting cable ties and raising the tile or leaf pack out of the water within a 363-µm hand net. The tile or leaf pack and its associated hand net contents were placed into a ziplock bag and transported to the laboratory in a cooler.
Laboratory processing of tiles consisted of scraping the top surface of the tile with a razor blade and scrubbing the entire tile with a toothbrush. After removing insects from the resulting homogenate, two subsamples of known volumes were filtered onto combusted and pre-weighed glass fiber filters (Whatman GF/F, 0.7 µm). Mass of organic (AFDM) and inorganic matter was determined for one filter, dried at 50 °C for 24 h, weighed to the nearest 0.001 g, burned at 500 °C for 3 h, and re-weighed. The second filter was frozen until analyzed for chlorophyll a using a Turner Designs fluorometer (model 10AU) and standard methods (APHA, 1985).
Laboratory processing of leaves consisted of rinsing off insects and sediments, oven-drying at 50 °C for 24 h, weighing to the nearest 0.001 g, burning at 500 °C for 3 h, and re-weighing. Insects and small benthic invertebrates were live-picked from sediments, preserved in 70% ethanol, and identified to family or order. We analyzed the abundances of the four most common invertebrate taxa (Ephemeroptera, Chironomidae, Oligochaeta and Copepoda).
Shrimp abundance in each study pool was assessed by trapping and by conducting standardized observations. Minnow traps, each baited with ~200 mL of dry cat food, were set overnight at an approximate density of 1 trap per m2 of pool surface area. On the following morning, trapped shrimps were identified to family, measured for carapace length ( 1 mm), and released. Daytime observations were conducted at each tile and leaf pack on days 8, 13, 20, 25 and 33 and were standardized within an observation date but were not standardized between observation dates. We recorded the number of shrimps in each family. Day 8 observations were conducted for one minute, recording shrimps occurring on the tile or leaf pack. On days 13, 20, and 25, observations were "spot checks," recording shrimps on the tile or leaf pack and in an estimated 5-inch radius around the tile or leaf pack. On day 33, observations were conducted for 10 minutes, again recording shrimps on the tile or leaf pack and in the 5-inch radius. 10-minute observations were not done on day 33 in one upstream reference reach pool. On day 42, density of the green stream goby (S. plumieri) in each pool was determined by snorkeling the entire pool and counting all individuals observed. Visibility was similar across pools. 

REFERENCES : 
APHA (American Public Health Association). (1985) Standard methods for the examination of water and wastewater, 16 edition. American Public Health Association, Washington, D.C.

CROSS-REFERENCES (other data sets related to this one): ) LTERDBAS #135 :Recovery of a tropical stream after a harvest-related chlorine poisoning event; LTERDBAS #149: Effects of a tropical stream poisoning: do they reflect effects of small-scale experiments?

SAMPLE LOCATION :  N/A

STORAGE SITES (of data files): Data is maintained by Effie Greathouse; LUQ Information Management System

INVESTIGATOR'S ASSIGNED KEYWORDS: chlorine poisoning, recovery, Decapoda, shrimps, Puerto Rico, tropical stream

LEF LTER OFFICIAL KEYWORDS (See table): Q SONADORA, HEADWATER STREAM, NUTRIENT CYCLES/POOLS, DISTURBANCE-HUMAN, ALGAE, AQUATIC DECAPODS, AQUATIC INSECTS

PUBLICATIONS :
Greathouse, E. A., J. G. March, and C. M. Pringle. 2005. Recovery of a tropical stream after a harvest-related chlorine poisoning event.Freshwater Biology 50: 603-615

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: N. BROKAW, A. LUGO

FILING
_X__ "File" copy only : Data Management will only file an electronic copy of the data file and its documentation 
___ "Enter" data on-line : Data Management will be in charge of entering the data on computer files

(Contact Eda C. Meléndez)

SITES DESCRIPTIONS: The poisoning occurred 140 m upstream from the 186 bridge crossing Quebrada Sonadora. Seven of our recovery study pools were located in the reach between the 186 bridge crossing and the swinging footbridge where the USGS gage is located. These 7 pools were located at the following distances upstream from the 186 bridge crossing: 357 m (= a reference pool), ~290 m (= a reference pool which was a small pool located adjacent to the "swimming hole"), 240 m (= a reference pool), ~215 m (= a reference pool), 190 m (= a reference pool), 140 m (= the first formerly poisoned pool which was the pool at upstream end of the poisoning), and 100 m (= a formerly poisoned pool). Eight of our recovery study pools were located downstream from the 186 bridge crossing. These 8 pools were all formerly poisoned pools and were located in the left bank (looking downstream) thread of the braided reach below the 186 bridge unless otherwise notes. These 8 pools were located at the following distances downstream from the 186 bridge crossing: 15 m (a pool on the right bank upstream from the "island" of the braided reach below the 186 bridge), 28 m, 47 m, 93 m (a pool of a mid-channel thread of the braided reach), 124 m, 140 m, 164 m.

Geographical positional system (GPS) Coordinates for each location:

location

Latitude

Longitude

 

  

 
     
     

VARIABLES (ATTRIBUTES):

File Name or # above (all in which the variable appears)

1-4 1 1 1

Abbreviation (as it appears on the data file)

 Pool depth flow cancov
NAME OF VARIABLE Pool code depth water velocity canopy cover

DEFINITION OFVARIABLE

 The pool in which the data is from; letters (A-E) are codes for pools from the reference reach where A is the most downstream reference pool and E is the most upstream reference pool; numbers (1-10) are codes for pools from the formerly poisoned reach where 1 is the most upstream poisoned pool and 10 is the most downstream poisoned pool The mean of depths measured at locations of tiles and leaf packs The mean of water velocities measured at locations of tiles or leaf packs The mean percent canopy cover measured with a spherical densiometer in the pool

UNIT

 N/A m m/s percent

PRECISION

 Absolute 0.005m variable unknown

RANGE OR LIST OF VALUES

 A,B,C,C,C,1,2,3,4,5,6,7,8,9,10 {0.26,..,0.445} {0.007,..,0.064} {28.1,..,77.5}

DATA TYPE

 Alphanumeric Real Real Real

MISSING DATA CODES

 none blank (Pools 1, 2 & 3) blank (Pools 1, 2 & 3) none

VARIABLES (ATTRIBUTES):
File Name or # above (all in which the variable appears) 1 1 1 1
Abbreviation (as it appears on the data file) poolarea no. traps X (no. trapped) A (no. trapped)
NAME OF VARIABLE surface area of pool the number of traps the number of Xiphocaris trapped the number of Atya trapped
DEFINITION OF VARIABLE The surface area of the pool The number of traps set in the pool The number of Xiphocaris shrimps caught over all of the traps set in the pool The number of Atya shrimps caught over all of the traps set in the pool
UNIT square meters number number number
PRECISION 0.1 absolute absolute absolute
RANGE OR LIST OF VALUES {2.8,..,98.5} {1,..,10} {0,..,180} {0,..,49}
DATA TYPE Real integer integer integer
MISSING MISSING DATA CODES none none blank blank

VARIABLES (ATTRIBUTES):
File Name or # above (all in which the variable appears) 1 1 1 1
Abbreviation (as it appears on the data file) M (no. trapped) X (cm) A (cm) M (cm)
NAME OF VARIABLE the number of Macrobrachium trapped Length of trapped Xiphocaris Length of trapped Atya Length of trapped Macrobrachium
DEFINITION OF VARIABLE The number of Macrobrachium shrimps caught over all of the traps set in the pool The mean length of Xiphocaris shrimps trapped from the pool The mean length of Atya shrimps trapped from the pool The mean length of Macrobrachium shrimps trapped from the pool
UNIT number cm cm cm
PRECISION absolute 1 mm 1 mm 1 mm
RANGE OR LIST OF VALUES {0,..,34} {9.3,..,11.0} {9.0,..,18.3} {14.8,..,29.6}
DATA TYPE integer Real Real Real
MISSING DATA CODES blank blank (pool 3) blank (pools 3 & 10) blank (pool 4)

VARIABLES (ATTRIBUTES):
File Name or # above (all in which the variable appears) 2 2 2 2
Abbreviation (as it appears on the data file) X (6/23) A (6/23) M (6/23) X (6/28)
NAME OF VARIABLE Xiphocaris observed on June 23 Atya observed on June 23 Macrobrachium observed on June 23 Xiphocaris observed on June 28
DEFINITION OF VARIABLE The mean number of Xiphocaris shrimps observed during one minute on leaf packs and tiles in the pool on June 23 The mean number of Atya shrimps observed during one minute on leaf packs and tiles in the pool on June 23 The mean number of Macrobrachium shrimps observed during one minute on leaf packs and tiles in the pool on June 23 The mean number of Xiphocaris shrimps observed during spot checks of leaf packs and tiles in the pool on June 23
UNIT number per leaf pack or tile number per leaf pack or tile number per leaf pack or tile number per leaf pack or tile
PRECISION absolute absolute absolute absolute
RANGE OR LIST OF VALUES {0.3,..,2.1} {0,..,0.428571} {0,..,0.142857} {0,..,1.75}
DATA TYPE real real real real
MISSING DATA CODES none none none none

VARIABLES (ATTRIBUTES):
File Name or # above (all in which the variable appears) 2 2 2 2
Abbreviation (as it appears on the data file) A (6/28) M (6/28) X (7/5) A (7/5)
NAME OF VARIABLE Atya observed on June 28 Macrobrachium observed on June 28 Xiphocaris observed on July 5 Atya observed on July 5
DEFINITION OF VARIABLE The mean number of Atya shrimps observed during spot checks of leaf packs and tiles in the pool on June 23 The mean number of Macrobrachium shrimps observed during spot checks of leaf packs and tiles in the pool on June 23 The mean number of Xiphocaris shrimps observed during spot checks of leaf packs and tiles in the pool on July 5 The mean number of Atya shrimps observed during spot checks of leaf packs and tiles in the pool on July 5
UNIT number per leaf pack or tile number per leaf pack or tile number per leaf pack or tile number per leaf pack or tile
PRECISION absolute absolute absolute absolute
RANGE OR LIST OF VALUES {0,..,2} {0,..,0.33} {0,..,1.5} {0,..,1.8333}
DATA TYPE real real real real
MISSING DATA CODES none none none none

VARIABLES (ATTRIBUTES):
File Name or # above (all in which the variable appears) 2 2 2 2
Abbreviation (as it appears on the data file) M (7/5) X (7/10) A (7/10) M (7/10)
NAME OF VARIABLE Macrobrachium observed on July 5 Xiphocaris observed on July 10 Atya observed on July 10 Macrobrachium observed on July 10
DEFINITION OF VARIABLE The mean number of Macrobrachium shrimps observed during spot checks of leaf packs and tiles in the pool on July 5 The mean number of Xiphocaris shrimps observed during spot checks of leaf packs and tiles in the pool on July 10 The mean number of Atya shrimps observed during spot checks of leaf packs and tiles in the pool on July 10 The mean number of Macrobrachium shrimps observed during spot checks of leaf packs and tiles in the pool on July 10
UNIT number per leaf pack or tile number per leaf pack or tile number per leaf pack or tile number per leaf pack or tile
PRECISION absolute absolute absolute absolute
RANGE OR LIST OF VALUES {0,..,0.2} {0,..,1.3333} {0,..,3.3333} {0,..,0}
DATA TYPE real real real real
MISSING DATA CODES none blank (pool 1) blank (pool 1) blank (pool 1)

VARIABLES (ATTRIBUTES):
File Name or # above (all in which the variable appears) 2 2 2 3
Abbreviation (as it appears on the data file) X (7/18) A (7/18) M (7/18) Chl(11)
NAME OF VARIABLE Xiphocaris observed on July 18 Atya observed on July 18 Macrobrachium observed on July 18 Chlorophyll a on day 11
DEFINITION OF VARIABLE The mean number of Xiphocaris shrimps observed over ten minutes on leaf packs and tiles in the pool on July 18 The mean number of Atya shrimps observed over ten minutes on leaf packs and tiles in the pool on July 18 The mean number of Macrobrachium shrimps observed over ten minutes on leaf packs and tiles in the pool on July 18 Mean chlorophyll a on tiles in the pool sampled on day 11
UNIT number per leaf pack or tile number per leaf pack or tile number per leaf pack or tile micrograms per square meter
PRECISION absolute absolute absolute 1 microgram
RANGE OR LIST OF VALUES {1.5,..,5} {1.5,..,6} {0.5,..,25} {576,..,2548}
DATA TYPE real real real integer
MISSING DATA CODES blank (pool E, pool 1, pool 2) blank (pool E, pool 1, pool 2) blank (pool E, pool 1, pool 2) none

VARIABLES (ATTRIBUTES):
File Name or # above (all in which the variable appears) 3 3 3 3
Abbreviation (as it appears on the data file) Chl(16) Chl(20) Chl(25) Chl(34)
NAME OF VARIABLE Chlorophyll a on day 16 Chlorophyll a on day 20 Chlorophyll a on day 25 Chlorophyll a on day 34
DEFINITION OF VARIABLE Mean chlorophyll a on tiles in the pool sampled on day 16 Mean chlorophyll a on tiles in the pool sampled on day 20 Mean chlorophyll a on tiles in the pool sampled on day 25 Mean chlorophyll a on tiles in the pool sampled on day 34
UNIT micrograms per square meter micrograms per square meter micrograms per square meter micrograms per square meter
PRECISION 1 microgram 1 microgram 1 microgram 1 microgram
RANGE OR LIST OF VALUES {1054,..,2815} {715,..,3915} {1429,..,3820} {253,..,12078}
DATA TYPE integer integer integer integer
MISSING DATA CODES none none none blank (pool E)

VARIABLES (ATTRIBUTES):
File Name or # above (all in which the variable appears) 3 3 3 3
Abbreviation (as it appears on the data file) AFDM(11) AFDM(16) AFDM(20) AFDM(25)
NAME OF VARIABLE AFDM on day 11 AFDM on day 16 AFDM on day 20 AFDM on day 25
DEFINITION OF VARIABLE Mean AFDM on tiles in the pool sampled on day 11 Mean AFDM on tiles in the pool sampled on day 16 Mean AFDM on tiles in the pool sampled on day 20 Mean AFDM on tiles in the pool sampled on day 25
UNIT grams per square meter grams per square meter grams per square meter grams per square meter
PRECISION 0.0001 g 0.0001 g 0.0001 g 0.0001 g
RANGE OR LIST OF VALUES {0.5323,..,4.4706} {0.9206,..,28.8438} {1.4570,..,4.3810} {0.9639,..,31.5401}
DATA TYPE real real real real
MISSING DATA CODES none none none none

VARIABLES (ATTRIBUTES):
File Name or # above (all in which the variable appears) 3 3 3 3
Abbreviation (as it appears on the data file) AFDM(34) Inorg(11) Inorg(16) Inorg(20)
NAME OF VARIABLE AFDM on day 34 Inorganic dry mass on day 11 Inorganic dry mass on day 16 Inorganic dry mass on day 20
DEFINITION OF VARIABLE Mean AFDM on tiles in the pool sampled on day 34 Mean Inorganic dry mass on tiles in the pool sampled on day 11 Mean Inorganic dry mass on tiles in the pool sampled on day 16 Mean Inorganic dry mass on tiles in the pool sampled on day 20
UNIT grams per square meter grams per square meter grams per square meter grams per square meter
PRECISION 0.0001 g 0.0001 g 0.0001 g 0.0001 g
RANGE OR LIST OF VALUES {1.9788,..,6.2286} {1.0829,..,25.9667} {2.7773,..,12.1637} {4.7709,..,13.0278}
DATA TYPE real real real real
MISSING DATA CODES blank (pool E) none none blank

VARIABLES (ATTRIBUTES):
File Name or # above (all in which the variable appears) 3 3 4 4
Abbreviation (as it appears on the data file) Inorg(25) Inorg(34) day initial_wet_wt
NAME OF VARIABLE Inorganic dry mass on day 25 Inorganic dry mass on day 34 sampling day Initial wet weight
DEFINITION OF VARIABLE Mean Inorganic dry mass on tiles in the pool sampled on day 25 Mean inorganic dry mass on tiles in the pool sampled on day 34 The sampling day in terms of the number of days after June 15 (=day 0) The air-dried weight of the leaf pack prior to placing it in the pool
UNIT grams per square meter grams per square meter number g
PRECISION 0.0001 g 0.0001 g absolute 0.001 g
RANGE OR LIST OF VALUES {3.3367,..,17.4286} {6.0133,..,27.1810} {6,.,20} {4.910,.,5.091}
DATA TYPE real real interger real
MISSING DATA CODES none pool E none none

VARIABLES (ATTRIBUTES):
File Name or # above (all in which the variable appears) 4 4 4 4
Abbreviation (as it appears on the data file) est_initial_dry_wt est_initial_AFDM dry_wt_onsampleday ashed_wt_onsampleday
NAME OF VARIABLE Estimated initial dry weight Estimated initial ash-free dry mass Dry weight on the sampling day Ashed weight on the sampling day
DEFINITION OF VARIABLE The estimate of the day 0 oven-dried weight of the leaf pack, estimated as the initial wet weight minus 0.382 g (an estimate of weight loss due to handing and oven-drying, based on "day 0" leaf packs) The estimate of the day 0 ash-free dry mass of the leaf pack, estimated as the estimated initial dry weight multiplied by the proportion AFDM on the sampling day (=propAFDM_onsampleday) The measured oven-dried weight of the leaf pack after sampling it on the sampling day The measured weight of the leaf pack after ashing it for 3 hours at 500degrees C after obtaining the "dry weight on sampling day"
UNIT g g g g
PRECISION 0.001 g 0.001 g 0.001 g 0.0001 g
RANGE OR LIST OF VALUES {4.528,.,4.709} {3.988,.,4.356} {0.295,.,3.708} {0.025,.,0.440}
DATA TYPE real real real real
MISSING DATA CODES none none none none

VARIABLES (ATTRIBUTES):
File Name or # above (all in which the variable appears) 4 4 4 4
Abbreviation (as it appears on the data file) AFDM_onsampleday propAFDM_onsampleday %AFDMremaining Ephemeroptera
NAME OF VARIABLE Ash-free dry mass on sampling day The proportion of AFDM on the sampling day The percent AFDM remaining on the sampling day Ephemeroptera
DEFINITION OF VARIABLE The ash-free dry mass of the leaf pack after sampling it on the sampling day (=the dry weight on the sampling day minus the ashed weight on the sampling day) =the AFDM on sampling day divided by the dry weight on sampling day =100 times the AFDM on the sampling day divided by the estimated initial AFDM The number of Ephemeroptera picked out of the leaf pack after sampling on the sampling day
UNIT g unitless percent number
PRECISION 0.0001 g 0.0001 0.01 absolute
RANGE OR LIST OF VALUES {0.270,.,3.294} {0.8660,.,0.9450} {6.29,..,81.12} {0,.,21}
DATA TYPE real real real integer
MISSING DATA CODES none none none none

VARIABLES (ATTRIBUTES):
File Name or # above (all in which the variable appears) 4 4 4
Abbreviation (as it appears on the data file) Chironomidae Oligochaeta Copepoda
NAME OF VARIABLE Chironomidae Oligochaeta Copepoda
DEFINITION OF VARIABLE The number of Chironomidae picked out of the leaf pack after sampling on the sampling day The number of Oligochaeta picked out of the leaf pack after sampling on the sampling day The number of Copepoda picked out of the leaf pack after sampling on the sampling day
UNIT number number number
PRECISION absolute absolute absolute
RANGE OR LIST OF VALUES {0,.,28} {0,..,46} {0,..,13}
DATA TYPE integer integer integer
MISSING DATA CODES none none blank

COMPUTATIONAL METHODS:

Variable Name

Formula
   

FOR DATA MANAGER USE ONLY

DATE OF LAST REVIEW: February 25, 2005
DATE OF LAST ENTRY : July 29, 1999
STAGE OF DATA SET MANAGEMENT (dates) :
RECEIVED: January 11, 2005
ENTERED: February 25, 2005
FILED ON-LINE: February 25, 2005
REVIEWED BY RESEARCHER
FILING MEDIA :
NAME OF DOCUMENTATION FILE : metadatapoisoningrecovery.doc; lterdb135.htm
NAME OF ON - LINE CATALOG : LTERDBAS
RECORD # : 135
DOCUMENT TYPE : data set (magnetic media)
PRIORITY TO BE ENTERED : N/A

Rev. date of this form: 8 June 2001 / 11 March 2002/ 20 May 2003