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GCE-LTER Data Set Summary

Accession: INV-GCEM-0210c Research Theme: Aquatic Invertebrate Ecology (Monitoring)
Contributors: Thomas Dale Bishop, Merryl Alber, Ken Helm, Gayle Albers, Laurel Berger-Bishop, Monica Watkins, Matt Ogburn, Caroline McFarlin, Cristiano Salgado
Title: Crab population monitoring: Fall 2002 mid-marsh and creekbank crab abundances based on hole counts at GCE marsh, monitoring sites 1-10
Abstract: This data set is the Fall 2002 estimate of crab densities at the GCE-LTER marsh sites used for population monitoring. Crab abundance was determined by counting the number of crab holes within a 625 cm^2 quadrat and converting the counts to number per square meter. Counts were made in the mid-marsh and creekbank zones (n = 4 per zone) at all sites. This method does not differentiate which species made a particular hole and therefore only estimates total crab abundance. Plugged holes were excluded from the counts. Mean density across all sites and zones was 258 m^-2 (+/- 176 s.d.).
DOI: 10.6073/pasta/b5bf92ad424946a8d194605c802510aa
Key Words: Aquatic Invertebrate Monitoring, Armases, crabs, creek bank, density, Eurytium, fall, intertidal, marshes, mid-marsh, monitoring, mud, permanent plots, population dynamics, Sesarma, Uca
LTER Core Area: Population Studies
Research Themes: Q2 - Domain Patterns, GCE3 Area2 - Patterns within the Domain, Aquatic Invertebrate Ecology
Study Period: 14-Oct-2002 to 20-Oct-2002
Study Sites:
GCE1 -- Eulonia, Georgia, USA
GCE2 -- Four Mile Island, Georgia, USA
GCE3 -- North Sapelo, Sapelo Island, Georgia, USA
GCE4 -- Meridian, Georgia, USA
GCE5 -- Folly River, Georgia, USA
GCE6 -- Dean Creek, Sapelo Island, Georgia, USA
GCE7 -- Carrs Island, Georgia, USA
GCE8 -- Alligator Creek, Georgia, USA
GCE9 -- Rockdedundy Island, Georgia, USA
GCE10 -- Hunt Camp, Sapelo Island, Georgia, USA
» Download Geographic Coverage: Google Earth, ESRI Shapefile (polygons, points)
Species References: Armases cinereum, Eurytium limosum, Sesarma reticulatum, Uca minax, Uca pugilator, Uca pugnax
Project References: Invasive species, Marine invertebrate monitoring
Downloads: Information

Data Table: INV-GCEM-0210c (Main data table for data set INV-GCEM-0210c, 80 records)

Access: Public (released 29-Oct-2003)

Metadata: Text (ESA FLED), XML (Ecological Metadata Language)

Data Formats: Spreadsheet (CSV) [8.67kb],  Text File [6.71kb],  Text Report [53.01kb],  MATLAB (GCE Toolbox) [530.99kb],  MATLAB (Variables) [323.77kb]

Column List:(hide)

Column Name Units Type Description
1 Year YYYY integer Calendar year of observation
2 Month M integer Calendar month of observation
3 Day D integer Calendar day of observation
4 Site None integer GCE-LTER sampling site number
5 Zone None integer Marsh zone code (1=Creekbank, 2=Mid-marsh)
6 Plot None integer GCE-LTER permanent plot number
7 Location none string Geographic location code in the GCE Metadata Database for the sampling plot
8 Flag_Location none string QA/QC flags for Geographic location code in the GCE Metadata Database for the sampling plot (flagging criteria, where "x" is Location: manual)
9 Location_Notes none string Notes on location assignments and geographic accuracy
10 Longitude degrees floating-point Geographic longitude in decimal degrees
11 Flag_Longitude none string QA/QC flags for Geographic longitude in decimal degrees (flagging criteria, where "x" is Longitude: x<-180="I", x>180="I", manual)
12 Latitude degrees floating-point Geographic latitude in decimal degrees
13 Flag_Latitude none string QA/QC flags for Geographic latitude in decimal degrees (flagging criteria, where "x" is Latitude: x<-90="I", x>90="I", manual)
14 Quadrat_Area cm^2 floating-point Areal measurement of the quadrat frame
15 Flag_Quadrat_Area none string QA/QC flags for Areal measurement of the quadrat frame (flagging criteria, where "x" is Quadrat_Area: x<0="I", x>5000="Q")
16 Hole_Count Count integer Number of crab holes recorded in 625 cm^2 quadrat
17 Flag_Hole_Count none string QA/QC flags for Number of crab holes recorded in 625 cm^2 quadrat (flagging criteria, where "x" is Hole_Count: x<0="I", x>87="Q")
18 Hole_Density Count/m^2 floating-point Calculated number of crab holes per meter squared
19 Flag_Hole_Density none string QA/QC flags for Calculated number of crab holes per meter squared (flagging criteria, where "x" is Hole_Density: x<0="I", x>1392="Q")
Statistics: Generate script code to retrieve data tables for analysis in: MATLAB, R, SAS, SPSS
Citation: Bishop, Thomas Dale. 2002. Crab population monitoring: Fall 2002 mid-marsh and creekbank crab abundances based on hole counts at GCE marsh, monitoring sites 1-10. Georgia Coastal Ecosystems LTER Project, University of Georgia, Long Term Ecological Research Network. http://dx.doi.org/10.6073/pasta/b5bf92ad424946a8d194605c802510aa

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This material is based upon work supported by the National Science Foundation under grants OCE-9982133, OCE-0620959 and OCE-1237140. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.