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:

• Add rows to tables or lines to paraghaphs as you need them for entering your data.
• Contact emelendez@lternet.edu, if you have any question.

PERSON(S) COMPLETING THIS FORM: E-MAIL ADDRESS:

DATA SET IDENTIFIER: Shrimp populations in Quebrada Prieta (Pools 0,1), (El Verde)

PROJECT TITLE: Fresh Water Shrimp Population Dynamics

PROJECT DESCRIPTION: Spatial and temporal patterns of abundances for coexisting species: different intensities and frequencies of disturbances can alter spatial and temporal patterns of abundances for coexisting species. To determine if these different hydrologic regimes altered distributions of populations, we compared shrimp densities during different periods of time. There were significant differences in the relationships between locations of stream pools along an elevational gradient (300 to 470 m) and the abundances of two species of shrimp (Atya lanipes and Xiphocaris elongata) during the following three periods: pre-Hurricane Hugo (20 mo), post-Hurricane Hugo (50 mo), and low-flow (12 mo).

Mechanisms that likely cause different patterns of distribution (See Abstract) include avoidance of predators coupled with active preference by prey species for pool habitats with low frequency of washout by storm flows, and with sufficient storage of food resources (microbially conditioned leaf detritus).

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):
NOTE: Please contact Allan Covich for the use of this data file.

Data File No.	Data File Identifier	On-Line Filename	Starting Date	Periodicity of sample	End Period
1	Freshwater shrimp from the Quebrada Prieta since 1988	ShrimpopinQPrieta.txt	January 1, 1988	Six times annually (bimonthly)	December 31, 2005

RESEARCH LOCATION: El Verde Study Area, Pool 0, Elevation 330 m, Quebrada Prieta (on Ox-cart Trail)

INVESTIGATORS:

PRINCIPAL INVESTIGATORS E-MAIL address

Alan Covich	alanc@cnr.colostate.edu
Todd Crowl	FACROWL@CC.USU.EDU

OTHER RESEARCHERS E-MAIL address

CONTACT PERSONS E-MAIL address Phone Number (Include area code)

Todd Crowl

FACROWL@CC.USU.EDU

(801)797-2498 h: (801)563-5095

SOURCE OF FUNDING (SPONSOR): NSF-LTER

DATA SET ABSTRACT: 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.

DATA SET METHODS: Shrimp are sampled during six periods each year. Each period represents a two month range (e.g. period 1 = January-February; period 2 = March-April, etc.). Wire minnow traps, baited with cat food are placed into the stream during the late afternoon and retrieved the following morning. All shrimp from each trap are enumerated by species and released.

REFERENCES:
Covich, A.P., (1)T.A. Crowl*, S.L. Johnson*, D. Varza*, and D. Certain*. 1991. Post-Hurricane Hugo increases in atyid shrimp abundances in a Puerto Rican montane stream. Biotropica 23:448-454.

Johnson, S.L.*, A.P. Covich, (1)T.A. Crowl, A. Estrada-Pinto, J. Bithorn, and W. Wurtsbaugh. 1996. Do seasonality and disturbance influence reproduction in freshwater atyid shrimp in headwater streams, Puerto Rico Verhandlungen Internationale Vereinigung Limnologie 26:2076-2081.

Covich, A.P., (1)T.A. Crowl, S.L. Johnson,* and M. Pyron*. 1996. Distribution and abundance of tropical freshwater shrimp along a stream corridor: response to disturbance. Biotropica 28:484-492.

CROSS-REFERENCES (other data sets related to this one): LTERDBAS #55: Shrimp and stream pool raw data
 
SAMPLE LOCATION: Quebrada Prieta, where the ox cart trail crosses

STORAGE SITES (of data files): ITES, Data Mngr.'s Cabinet DM333-01, Drawer #3

INVESTIGATOR'S ASSIGNED KEYWORDS: recolonization,disturbance,atya lanipes,xiphocarts elongata,macrobrachium carcinus,epilobocera sinvatifrons,freshwater shrimp, decapods, streams, invertebrates

LEF LTER OFFICIAL KEYWORDS (See table): EL VERDE, Q PRIETA, HEADWATER STREAM , TABONUCO, DISTURBANCE, COLONIZATION, DECAPODS, PEER REVIEWED JOURNAL

PUBLICATIONS:
Covich, A. P., T. A. Crowl, S. L. Johnson, D. Varza, and D. Certain. 1991. Post-Hurricane Hugo increases in atyid shrimp abundances in a Puerto Rican montane stream. Biotropica 23:448-454

Johnson, K.H., K.A. Vogt, H.C. Clark, O.J. Schmitz and D.J. Vogt. 1996. Biodiversity and the productivity and stability of ecosystems. Trends in Ecology and Evolution 11:372-377

Covich, A.P., T.A. Crowl, S.L. Johnson, and M. Pyron. 1996. Distribution and abundance of tropical freshwater shrimp along a stream corridor: Response to disturbance. Biotropica 28:484-492

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: El Verde Study Area, Pool 0, Elevation 330 m, Quebrada Prieta (on Ox-cart Trail)

Geographical positional system (GPS) Coordinates for each location:

location	latitude	longitude
Quebrada Prieta (on Ox-cart Trail) (Pool 0

VARIABLES (ATTRIBUTES):

FILE NAME OR #ABOVE (all in which the variable appears)	1	1	1	1
ABBREVIATION (as it appears on the data file)	YR	PERIOD	TOTATYA	TOTAXIPH
NAME OF VARIABLE	Year of observation	Period of observation	Total of Atya lanipes	Total of Xipho. elongata
DEFINITION OF VARIABLE	the year in which the observation was performed	One of six periods in a year, representing a two month range when the shrimp are sampled	Number of freshwater Atya lanipes shrimps captured from the Quebrada Prieta and then released.	Number of freshwater Xiphocaris elongata shrimps captured from the Quebrada Prieta and then released.
UNIT	N/A	N/A	N/A	N/A
PRECISION	N/A	N/A	N/A	N/A
RANGE OR LIST OF VALUES	{1988, ...}	1 = January-February, 2 = March-April, 3 = May-June, 4 = July-August, 5 = September-October, 6 = November-December
DATA TYPE	integer	integer	integer	integer
MISSING DATA CODES	record missing	record missing	record missing	record missing

VARIABLES (ATTRIBUTES):  

FILE NAME OR #ABOVE (all in which the variable appears)	1	1
ABBREVIATION (as it appears on the data file)	TOTAMAX	TOTSHRIMP
NAME OF VARIABLE	Total of Macrobrachium s.	All shrimp (sum)
DEFINITION OF VARIABLE	Number of freshwater Macrobrachium species shrimps captured from the Quebrada Prieta and then released.	Number of all shrimps captured from the Quebrada Prieta and then released.
UNIT	N/A	N/A
PRECISION	N/A	N/A
RANGE OR LIST OF VALUES
DATA TYPE	integer	integer
MISSING DATA CODES	record missing	record missing

COMPUTATIONAL METHODS:  

Variable Name	Formula

DATE OF LAST REVIEW: January 24, 2008
DATE OF LAST ENTRY: March 1997
STAGE OF DATA SET MANAGEMENT (dates):
RECEIVED ENTERED: 3/5/1997
FILED ON-LINE: 4/28/1997
REVIEWED BY RESEARCHER
FILING MEDIA:
NAME OF DOCUMENTATION FILE: covitodd.htm
NAME OF ON - LINE CATALOG: LTERDBAS
RECORD #: 54
DOCUMENT TYPE: data set (magnetic media)
PRIORITY TO BE ENTERED: N/A