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GCE-LTER Data Set Summary

Accession: INV-GCES-1609 Research Theme: Aquatic Invertebrate Ecology (Synthesis)
Contributors: Merryl Alber, Steve Pennings, Dale Bishop, Wade Sheldon
Title: Long-term Burrowing Crab Population Abundance Data from the Georgia Coastal Ecosystems LTER Fall Marsh Monitoring Program
Abstract: This data set includes long-term observational data on burrowing crab abundance at 10 Georgia Coastal Ecosystems marsh sites used for annual plant and invertebrate population monitoring. Crab abundance was determined by performing surveys of crab hole occurance within replicate 625 square centimeter quadrats and converting the counts to number per square meter. Surveys were performed annually during October within the mid-marsh and creek bank zones at GCE marsh study sites 1 through 10 (i.e. n = 4 per zone at each site). Surveys were also performed in an additional high marsh Juncus zone at several sites beginning in 2009 (i.e. n = 4 quadrats per site). Note that this census method does not differentiate which species made a particular hole and therefore only estimates total burrowing crab abundance, potentially including species Uca pugnax, Uca minax, Uca pugilator, Armases cinereum, Eurytium limosum, Sesarma reticulatum and Panopeus spp. Crab holes that are not actively maintained are quickly covered by tidal activity and other sediment disturbances, therefore plugged holes were assumed to be unoccupied and excluded from the counts. This data set includes cumulative observations from 2000 to 2015, and will be updated annually to include the prior year observations.
DOI: 10.6073/pasta/a7c8ca8c18d33d161dcb220f7d47df27
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: Populations
Research Themes: Q2 - Domain Patterns, GCE3 Area2 - Patterns within the Domain, Aquatic Invertebrate Ecology
Study Period: 06-Oct-2001 to 26-Oct-2015
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: Marine invertebrate monitoring
Downloads: Information

Data Table: INV-GCES-1609 (Main data table for data set INV-GCES-1609, 1236 records)

Access: Public (released 12-Oct-2016)

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

Data Files: Spreadsheet (CSV) [112.26kb],  Text File [99.60kb],  Text Report [211.49kb],  MATLAB (GCE Toolbox) [1286.57kb],  MATLAB (Variables) [862.69kb]

Column List:(hide)

Column Name Units Type Description
1 Date YYYY-MM-DD string Calendar date
2 Year YYYY integer Calendar year of observation
3 Site None integer GCE-LTER sampling site number
4 Zone None integer Marsh zone code (1=Creekbank, 2=Mid-marsh)
5 Plot None integer GCE-LTER permanent plot number
6 Location none string Geographic location code in the GCE Metadata Database for the sampling plot
7 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)
8 Location_Notes none string Notes on location assignments and geographic accuracy
9 Longitude degrees floating-point Geographic longitude in decimal degrees
10 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)
11 Latitude degrees floating-point Geographic latitude in decimal degrees
12 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)
13 Quadrat_Area cm^2 floating-point Areal measurement of the quadrat frame
14 Hole_Count Count integer Number of crab holes recorded in 625 cm^2 quadrat
15 Hole_Density Count/m^2 floating-point Calculated number of crab holes per meter squared
Statistics: Generate script code to retrieve data tables for analysis in: MATLAB, R, SAS, SPSS
Citation: Alber, Merryl (2016): Long-term Burrowing Crab Population Abundance Data from the Georgia Coastal Ecosystems LTER Fall Marsh Monitoring Program. Georgia Coastal Ecosystems LTER Project; University of Georgia; Long Term Ecological Research Network. (http://dx.doi.org/10.6073/pasta/a7c8ca8c18d33d161dcb220f7d47df27)

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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.