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 |
DATA SET IDENTIFIER : Effects of a tropical stream poisoning: do they reflect effects of small-scale experiments?
PROJECT TITLE : Effects of and recovery from poisoning (Effects of and recovery from chlorine poisoning, Quebrada Sonadora)
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 (See online list)
Disturbance Patterns |
LEF LTER 1 RESEARCH TOPIC: (Annotate all that apply) (See online list)
Disturbance |
| Recovery-Env. Props. |
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 |
The number and mean lengths of shrimps from trapping ~2 weeks after the poisoning |
March 26, 1999 |
Twice |
March 28, 1999 |
|
2 |
Physical and biological parameters from 10 survey pools and 10 survey riffles ~2 weeks after the poisoning |
March 26, 1999 |
Once |
March 28, 1999 |
|
3 |
Biological parameters from experimental pools ~2 weeks after the poisoning |
March 30, 1999 |
Once |
April 6, 1999 |
RESEARCH
LOCATION: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 |
Other Researchers |
E-MAIL address |
Effie A. Greathouse |
|
Nina Hemphill |
nhemphill@mp.usbr.gov |
Ernesto Garcia |
|
William H. McDowell |
wmcdowell@lternet.edu |
James G. March |
jmarch@lternet.edu |
Alonso Ramirez |
aramirez@lternet.edu |
CONTACT PERSONS |
Phone Number |
E-MAIL address |
Effie A. Greathouse |
706-542-1120 |
SOURCE OF FUNDING (SPONSOR): Luquillo LTER (BSR-8811902, DEB 9411973, DEB 0080538, DEB 0218039), USDA Forest Service (10-21-RR551-112)
DATA SET ABSTRACT: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 second-order stream draining the Luquillo Experimental Forest in northeastern Puerto Rico. The illegal poisoning (for shrimp harvest) caused massive mortality of shrimps and aquatic insects. Atyid and xiphocaridid shrimp abundances in pools of the poisoned reach were reduced by ~95%, relative to abundances in an upstream reference reach. A survey of poisoned vs. reference pools, combined with a manipulative experiment (in which atyid and xiphocaridid shrimps were added to 3 poisoned pools), showed that reduced shrimp abundances due to the poisoning had strong impacts on benthic resources. The benthos of poisoned pools, where shrimp abundances were reduced, had 4 times more chlorophyll a, 6 times more algal biovolume, 4 times more fine particulate organic matter, 14 times more fine particulate inorganic matter, 5 times more carbon, and 4 times more nitrogen than did the benthos of pools in the reference reach. These increases in benthic resources were consistent with increases in algae, organic/inorganic matter, and nutrients in previous small-scale shrimp exclusion experiments conducted in the study river and tributaries. Effects of shrimp poisoning on the benthos varied by habitat, with riffles showing fewer significant differences than did pools. Compared to reference riffles, poisoned riffles had higher standing stocks of fine particulate inorganic matter, nitrogen, and biovolume of filamentous algae, and lower epilithic C:N ratios. Overall, previous small-scale exclusion experiments were highly predictive of the direction of effects due to large-scale shrimp removal by poisoning. Our study provides a tropical data set to add to the short list of stream studies that examine the predictive power of small-scale experiments for larger scales.
Survey
From 26--29 March 1999, we assessed effects of the poisoning in 5 pools and 5 riffles (= cascades) in the upper 100 meters of the 500-m reach affected by the poisoning (Fig. 1). We used 5 pools and 5 riffles in a 100-m reach upstream from the poisoning as a reference (Fig. 1).
Three of the pools and 3 of the riffles in each of the reaches were sampled on 26 March for epilithic chlorophyll a, FPOM, fine particulate inorganic matter (FPIM), carbon (C), nitrogen (N), carbon to nitrogen ratio (C:N, mass ratio), and algal biovolume using a quantitative suction sampler modified from Loeb (1981). In each habitat unit, 5 rock surfaces were chosen that satisfied 2 criteria:a surface angle of less than 45 degrees; and a depth of at least 5 cm. Six Loeb samples were taken from each rock surface; 3 were pooled and put on ice for later chlorophyll a analysis and the other 3 were pooled for later analysis of FPOM, FPIM, C, N, C:N and algal biovolume. A single minnow trap baited with ~200 mL of cat food was placed and left overnight in each of 3 pools upstream and 3 pools downstream from the poisoning.
On 27 March, trapped shrimps were retrieved in the morning, identified to genus, measured for total length, and returned to the pool in which they were trapped. The additional two pools and two riffles in each of the reaches were then Loeb sampled as described above. Insects occurring on rock surfaces were then sampled by sweeping a 250-mm hand net over a 100 cm2 area in each of the 20 habitat units (5 pools and 5 riffles in each reach). Trapping was repeated in the 3 pools sampled on 26 March using the procedure described above; traps were re-set on the evening of 27 March and retrieved on the morning of 28 March.
Experiment
We conducted a manipulative experiment, adding atyid and xiphocaridid shrimps, trapped in the upstream reference reach, to pools of the poisoned reach and then monitored how quickly they modified the benthic depositional environment. Response variables measured were epilithic chlorophyll a, FPOM, FPIM, C, N, and C:N. Three manipulated pools were compared to 3 control pools in which no shrimps were added. All 6 pools were located in the poisoned reach. Trapping to collect shrimps for the experiment occurred on 28 and 29 March, and numbers added were based on measurements of pool surface area and previously observed shrimp densities in pools of the Sonadora (12 individuals/m2; Pringle et al. 1999). All 6 pools were Loeb sampled, using methods described above, 1 day prior to adding shrimps (“day 0”) and 6 days after adding shrimps (“day 6”). For the first 2 days after adding the original batch of atyid and xiphocaridid shrimps, we did not observe any of the added atyid shrimps in one of the manipulated pools; thus, on day 2, we supplemented this pool with additional atyid shrimps again based on previously observed shrimp densities.
Laboratory and data analyses
Chlorophyll a samples were filtered onto pre-ashed glass fiber filters (Whatman GF/F, 0.7 µm) which were then frozen until conducting standard chlorophyll a analysis methods (APHA1985) using a Turner Designs fluorometer (model 10AU). Loeb samples intended for analyses of FPOM, FPIM, C, N, C:N, and algal biovolume were split into 2 sub-samples:10 mL were preserved in 10% formalin for later algal biovolume analyses, and the volume of the remaining sample was measured and filtered onto a pre-ashed, pre-weighed glass fiber filter. This filter was dried at 60°C for 24 hours, cooled in a dessicator, and cut into roughly equal sections which were then weighed to the nearest 0.0001 g. One filter section was used for total C and N analyses, which was determined using a Perkin Elmer CHN analyzer. The second filter section was combusted at 500 °C, cooled in a dessicator, and weighed again to determine mass of organic (AFDM) and inorganic matter.
All algal biovolume sub-samples from a single pool were combined and concentrated to a known volume prior to conducting Palmer cell counts on a 0.1-mL aliquot. The aliquot was scanned at 400x magnification, and 500 algal cells or filaments were identified. Abundances of pennate diatoms too small for identification to species at 400x magnification were determined at 1000x using Naphrax permanent mounts of a separate cleaned aliquot (Carr et al. 1986). To calculate biovolume, average lengths, widths, and depths of 10 cells or filaments of each taxon were used in equations that match the geometric shape of the cell or filament (Gruendling 1971). Aquatic insects were identified to order.
REFERENCES :
APHA (American Public Health Association). 1985. Standard methods for the examination of water and wastewater. 16th edition. American Public Health Association, Washington, D.C.
Carr, J. M. , G. L. Hergenrader, and N. H. Troelstrup. 1986. A simple inexpensive method for cleaning diatoms. Transactions of the American Microscopical Society 105:152-157.
Gruendling, G. K. 1971. Ecology of the epipelic algal community in Marion Lake, British Columbia. Journal of Phycology 7:239-249.
Loeb, S. L. 1981. An in situ method for measuring the primary productivity and standing crop of the epilithic periphyton community in lentic systems. Limnology and Oceanography 26:394-399.
Pringle, C. M. , N. Hemphill, W. H. McDowell, A. Bednarek, and J. G. March. 1999. Linking species and ecosystems:different biotic assemblages cause interstream differences in organic matter. Ecology 80:1860-1872.
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.
INVESTIGATOR'S ASSIGNED KEYWORDS: chlorine poisoning, experimental scale, 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. , C. M. Pringle, N. Hemphill, E. García, W. H. McDowell,
J. G. March, and A. Ramírez. Unpublished manuscript. Effects of a tropical
stream poisoning:do they reflect effects of small-scale experiments?
DISSEMINATION :
RESTRICTED UNRESTRICTED XXX (after Jan 2006)
REASONS TO RESTRICT DATA IN THIS DATA SET BEYOND ITS TWO YEAR POLICY PERIOD*:
We request restriction until January 2006 or final acceptance of our manuscripts (currently in revision), whichever comes sooner.
*WILL HAVE TO BE APPROVED BY LTER PRINCIPAL INVESTIGATORS:J. ZIMMERMAN, A. LUGO , D.J. LODGE
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. Melendez)
SITES DESCRIPTIONS:
The poisoning occurred 140 m upstream from the 186 bridge crossing Quebrada Sonadora. All of our 11 poisoning effects study pools were located in the reach between the 186 bridge crossing and the swinging footbridge where the USGS gage is located.
Geographical positional system (GPS) Coordinates for each location:
location |
latitude |
longitude |
VARIABLES (ATTRIBUTES:
File Name or # above (all in which the variable appears) |
1-3 |
1 |
1 |
1 |
Abbreviation (as it appears on the data file) |
Pool/riffle |
X (No. 3/27) |
A (No. 3/27) |
M (No. 3/27) |
NAME OF VARIABLE |
Pool and riffle codes |
Number of Xiphocaris on March 27 |
Number of atyids on March 27 |
Number of Macrobrachium on March 27 |
DEFINITION OF VARIABLE |
The pool (P) or riffle (R) in which the data is from; A indicates a reference pool from above the poisoning; B indicates a poisoned pool |
The number of Xiphocaris shrimps in the trap on the morning of March 27 |
The number of atyid shrimps in the trap on the morning of March 27 |
The number of Macrobrachium shrimps in the trap on the morning of March 27 |
UNIT |
N/A |
number per trap |
number per trap |
number per trap |
PRECISION |
Absolute |
absolute |
absolute |
absolute |
RANGE OR LIST OF VALUES |
AP1, AP2, AP3, AP4, AP5, AP6, BP1, BP2, BP2.5, BP3, BP4, BP5 AR1, AR2, AR3, AR4, AR5, BR1, BR2, BR3, BR4, BR5 |
{1,. . ,145} |
{0,. . ,9} |
{0,. . ,6} |
DATA TYPE |
Alphanumeric |
Integer |
Integer |
Integer |
MISSING DATA CODES |
none |
none |
none |
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) |
X (No. 3/28) |
A (No. 3/28) |
M (No. 3/28) |
X (cm 3/27) |
NAME OF VARIABLE |
Number of Xiphocaris on March 28 |
Number of atyids on March 28 |
Number of Macrobrachium on March 28 |
Length of Xiphocaris on March 27 |
DEFINITION OF VARIABLE |
The number of Xiphocaris shrimps in the trap on the morning of March 28 |
The number of atyid shrimps in the trap on the morning of March 28 |
The number of Macrobrachium shrimps in the trap on the morning of March 28 |
The mean length of Xiphocaris shrimps in the trap on the morning of March 27 |
UNIT |
number per trap |
number per trap |
number per trap |
cm |
PRECISION |
absolute |
absolute |
absolute |
1 mm |
RANGE OR LIST OF VALUES |
{1,. . ,82} |
{0,. . ,30} |
{0,. . ,4} |
{3.4,. . ,5.2} |
DATA TYPE |
Integer |
Integer |
Integer |
Real |
MISSING DATA CODES |
none |
none |
none |
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) |
A (cm 3/27) |
M (cm 3/27) |
X (cm 3/28) |
A (cm 3/28) |
NAME OF VARIABLE |
Length of atyids on March 27 |
Length of Macrobrachium on March 27 |
Length of Xiphocaris on March 28 |
Length of atyids on March 28 |
DEFINITION OF VARIABLE |
The mean length of atyid shrimps in the trap on the morning of March 27 |
The mean length of Macrobrahium shrimps in the trap on the morning of March 27 |
The mean length of Xiphocaris shrimps in the trap on the morning of March 28 |
The mean length of atyid shrimps in the trap on the morning of March 28 |
UNIT |
cm |
cm |
cm |
cm |
PRECISION |
1 mm |
1 mm |
1 mm |
1 mm |
RANGE OR LIST OF VALUES |
{0,. . ,6.0} |
{0,. . ,5.6} |
{0,. . ,4.4} |
{0,. . ,6.3} |
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) |
1 |
2 |
2 |
2 |
Abbreviation (as it appears on the data file) |
M (cm 3/28) |
cancov |
depth |
flow |
NAME OF VARIABLE |
Length of Macrobrachium on March 28 |
canopy cover |
depth |
water velocity |
DEFINITION OF VARIABLE |
The mean length of Macrobrahium shrimps in the trap on the morning of March 28 |
The percent canopy cover measured with a spherical densiometer in the pool or riffle |
The mean of depths measured at locations of Loeb sampling for chlorophyll, organic & inorganic matter |
The mean of water velocities measured at locations of Loeb sampling for chlorophyll, organic & inorganic matter |
UNIT |
cm |
percent |
m |
m/s |
PRECISION |
1 mm |
unknown |
0.005 m |
variable |
RANGE OR LIST OF VALUES |
{0,. . ,7.4} |
{23.30,. . ,77.64) |
{0.115,. . ,0.392) |
{0.015,. . ,0.310) |
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) |
Ephemeroptera |
Trichoptera |
Diptera |
chlorophyll |
NAME OF VARIABLE |
Ephemeroptera density |
Trichoptera density |
Diptera density |
chlorophyll a |
DEFINITION OF VARIABLE |
The density of Ephemeroptera measured in sweep sampling |
The density of Trichoptera measured in sweep sampling |
The density of Diptera measured in sweep sampling |
The mean epilithic chlorophyll a measured at locations of Loeb sampling for algal, organic & inorganic matter |
UNIT |
number per square m |
number per square m |
number per square m |
mg per square m |
PRECISION |
1 individual |
1 individual |
1 individual |
0.001 |
RANGE OR LIST OF VALUES |
{0,. . ,9200} |
{0,. . ,60) |
{0,. . ,140) |
{0.170,. . ,4.09} |
DATA TYPE |
integer |
integer |
integer |
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) |
FPOM |
FPIM |
carbon |
nitrogen |
NAME OF VARIABLE |
fine particulate organic matter |
fine particulate inorganic matter |
carbon |
nitrogen |
DEFINITION OF VARIABLE |
The mean epilithic organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic inorganic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic carbon from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic nitrogen from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
UNIT |
mg per square m |
mg per square m |
g per square m |
g per square m |
PRECISION |
0.1 mg |
0.1 mg |
0.001 g |
0.001 g |
RANGE OR LIST OF VALUES |
{614.1,. . ,5234.4} |
{32.0,. . ,21975.2} |
{9.919,. . ,140.468} |
{0.491,. . ,10.657} |
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) |
C:N |
blue-green_filament |
Achnanthes_minutissima |
Achnanthes_lanceolata |
NAME OF VARIABLE |
carbon-to-nitrogen ratio |
biovolume of unidentified blue-green filaments |
biovolume of Achnanthes minutissima |
biovolume of Achnanthes lanceolata |
DEFINITION OF VARIABLE |
The mean epilithic carbon-to-nitrogen ratio from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic biovolume of unidentified blue-green algal filaments from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic biovolume of Achnanthes minutissima from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic biovolume of Achnanthes lanceolata from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
UNIT |
dimensionless |
cubic mm per square m |
cubic mm per square m |
cubic mm per square m |
PRECISION |
0.001 |
0.1 |
0.1 |
0.1 |
RANGE OR LIST OF VALUES |
{8.987,. . ,50.331} |
{0.0,. . ,239.4} |
{1.9,. . ,465.0} |
{0,. . ,908.1} |
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) |
Cocconeis_spp. |
Cymbella_spp. |
Denticula_elegans |
Navicula_contenta |
NAME OF VARIABLE |
biovolume of Cocconeis spp. |
biovolume of Cymbella spp. |
biovolume of Denticula elegans |
biovolume of Navicula contenta |
DEFINITION OF VARIABLE |
The mean epilithic biovolume of Cocconeis spp. from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic biovolume of Cymbella spp. from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic biovolume of Denticula elegans from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic biovolume of Navicula contenta from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
UNIT |
cubic mm per square m |
cubic mm per square m |
cubic mm per square m |
cubic mm per square m |
PRECISION |
0.1 |
0.1 |
0.1 |
0.1 |
RANGE OR LIST OF VALUES |
{0,. . ,908.1} |
{0,. . ,107.1} |
{0,. . ,24.3} |
{0,. . ,40.3} |
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) |
Navicula_minima |
Navicula_radiosa |
Navicula_spp. |
Nitschia_clausii |
NAME OF VARIABLE |
biovolume of Navicula minima |
biovolume of Navicula radiosa |
biovolume of Navicula spp. |
biovolume of Nitzchia clausii |
DEFINITION OF VARIABLE |
The mean epilithic biovolume of Navicula minima from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic biovolume of Navicula radiosa from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic biovolume of Navicula spp. from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic biovolume of Nitzchia clausii from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
UNIT |
cubic mm per square m |
cubic mm per square m |
cubic mm per square m |
cubic mm per square m |
PRECISION |
0.1 |
0.1 |
0.1 |
0.1 |
RANGE OR LIST OF VALUES |
{0,. . ,31.3} |
{0,. . ,225.3} |
{0,. . ,53.5} |
{0,. . ,9.1} |
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) |
Nitschia_palea |
Nitschia_spp. |
Fragillaria/Synedra |
Gomphonema_parvulum |
NAME OF VARIABLE |
biovolume of Nitschia palea |
biovolume of Nitschia spp. |
biovolume of Fragillaria and Synedra |
biovolume of Gomphonema parvulum |
DEFINITION OF VARIABLE |
The mean epilithic biovolume of Nitschia palea from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic biovolume of Nitschia spp. from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic biovolume of Fragillaria and Synedra from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
The mean epilithic biovolume of Gomphonema parvulum from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
UNIT |
cubic mm per square m |
cubic mm per square m |
cubic mm per square m |
cubic mm per square m |
PRECISION |
0.1 |
0.1 |
0.1 |
0.1 |
RANGE OR LIST OF VALUES |
{0,. . ,127.4} |
{0,. . ,8.4} |
{0,. . ,1290.5} |
{5.3,. . ,1179.9} |
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 |
3 |
3 |
3 |
Abbreviation (as it appears on the data file) |
Gomphonema_spp |
treatment |
org_day0 |
inorg_day0 |
NAME OF VARIABLE |
biovolume of Gomphonema spp. |
experimental treatment |
organic matter on day 0 |
inorganic matter on day 0 |
DEFINITION OF VARIABLE |
The mean epilithic biovolume of Gomphonema spp. from organic matter measured at locations of Loeb sampling for algal, organic & inorganic matter |
Experimental treatment applied to the pool (control = no shrimp added; addition = shrimp added) |
Epilithic organic matter in the pool prior to adding shrimps to addition pools |
Epilithic inorganic matter in the pool prior to adding shrimps to addition pools |
UNIT |
cubic mm per square m |
N/A |
g per square m |
g per square m |
PRECISION |
0.1 |
absolute |
0.001 g |
0.001 g |
RANGE OR LIST OF VALUES |
{0,. . ,2150.2} |
treatment, control |
{1.186,. . ,16.822} |
{2.929,. . ,59.713} |
DATA TYPE |
real |
alphanumeric |
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) |
org_day6 |
inorg_day6 |
chl_day0 |
chl_day6 |
NAME OF VARIABLE |
organic matter on day 6 |
inorganic matter on day 6 |
chlorophyll a on day 0 |
chlorophyll a on day 6 |
DEFINITION OF VARIABLE |
Epilithic organic matter in the pool 6 days after adding shrimps to addition pools |
Epilithic inorganic matter in the pool 6 days after adding shrimps to addition pools |
Epilithic chlorophyll a in the pool prior to adding shrimps to addition pools |
Epilithic chlorophyll a in the pool 6 days after adding shrimps to addition pools |
UNIT |
g per square m |
g per square m |
mg per square m |
mg per square m |
PRECISION |
0.001 g |
0.001 g |
0.001 mg |
0.001 mg |
RANGE OR LIST OF VALUES |
{1.380,. . ,5.133} |
{0.481,. . ,15.747} |
{0.487,. . ,2.016} |
{0.143,. . ,0.754} |
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) |
C_day0 |
C_day6 |
N_day0 |
N_day6 |
NAME OF VARIABLE |
carbon on day 0 |
carbon on day 6 |
nitrogen on day 0 |
nitrogen on day 6 |
DEFINITION OF VARIABLE |
Epilithic carbon from organic matter in the pool prior to adding shrimps to addition pools |
Epilithic carbon from organic matter in the pool 6 days after adding shrimps to addition pools |
Epilithic nitrogen from organic matter in the pool prior to adding shrimps to addition pools |
Epilithic nitrogen from organic matter in the pool 6 days after adding shrimps to addition pools |
UNIT |
g per square m |
g per square m |
g per square m |
g per square m |
PRECISION |
0.001 g |
0.001 g |
0.001 g |
0.001 g |
RANGE OR LIST OF VALUES |
{26.266,. . ,488.430} |
{22.074,. . ,127.325} |
{2.867,. . ,102.250} |
{1.268,. . ,8.014} |
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 |
Abbreviation (as it appears on the data file) |
C:N_day0 |
C:N_day6 |
NAME OF VARIABLE |
carbon to nitrogen ratio on day 0 |
carbon to nitrogen ratio on day 6 |
DEFINITION OF VARIABLE |
Epilithic carbon to nitrogen ratio from organic matter in the pool prior to adding shrimps to addition pools |
Epilithic carbon to nitrogen ratio from organic matter in the pool 6 days after adding shrimps to addition pools |
UNIT |
unitless |
unitless |
PRECISION |
0.001 |
0.001 |
RANGE OR LIST OF VALUES |
{4.777,. . ,13.441} |
{14.569,. . ,19.602} |
DATA TYPE |
real |
real |
MISSING DATA CODES |
none |
none |
COMPUTATIONAL METHODS:
Variable Name |
Formula |
FOR DATA MANAGER USE ONLY
DATE OF LAST
REVIEW:March 14, 2009
DATE OF LAST ENTRY : April 6, 1999
STAGE OF DATA SET MANAGEMENT
(dates:RECEIVED:12/24/2004
ENTERED:1/9/2007
FILED ON-LINE:6/7/2007
REVIEWED BY RESEARCHER
FILING MEDIA :
NAME OF
DOCUMENTATION FILE :metadatapoisoningeffects.doc, lterdb149.htm
NAME OF ON -
LINE CATALOG : LTERDBAS
RECORD # : 149
DOCUMENT
TYPE :digial media only
PRIORITY TO BE ENTERED :N/A
Rev. date of this form:15 July 2001/June 9, 2003/March 16, 2004