Georgia Coastal Ecosystems LTER Data Set Details

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GCE-LTER Data Set Summary

Accession:

INV-GCEM-0411b

Research Theme:

Aquatic Invertebrate Ecology (Monitoring)

Contributors:

Thomas Dale Bishop, Ken Helm, Caroline McFarlin, Jacob Shalack

Title:

Fall 2004 crab population monitoring: mid-marsh and creekbank abundance based on crab hole counts at GCE marsh, monitoring sites 1-10

Abstract:

This data set is the Fall 2004 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 154 m^-2 (+/- 188 s.d).

DOI:

10.6073/pasta/ce034ffa19756a05aea8542f188a5325

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:

GCE2 Q2 - Domain Patterns, GCE3 Area2 - Patterns within the Domain, Aquatic Invertebrate Ecology

Study Period:

23-Oct-2004 to 27-Oct-2004

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

Species References:

Armases cinereum, Eurytium limosum, Sesarma reticulatum, Uca minax, Uca pugilator, Uca pugnax

Project References:

Invasive species, Marine invertebrate monitoring

Downloads:

Data Table: INV-GCEM-0411b (Main data table for data set INV-GCEM-0411b, 80 records)

Access: Public (released 11-Nov-2005)

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

Data Formats: Spreadsheet (CSV) [8.64kb], Text File [6.68kb], MATLAB (GCE Toolbox) [565.24kb], MATLAB (Variables) [339.20kb], Text Report [59.68kb]

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>132="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>2112="Q")

Statistics:

Generate script code to retrieve data tables for analysis in: MATLAB, R, SAS, SPSS

Citation:

Bishop, Thomas Dale. 2004. Fall 2004 crab population monitoring: mid-marsh and creekbank abundance based on crab 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/ce034ffa19756a05aea8542f188a5325

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