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GCE-LTER Data Set Summary
Accession:
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INV-GCEM-0401
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Research Theme:
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Aquatic Invertebrate Ecology (Monitoring)
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Contributors:
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Thomas Dale Bishop, Ken Helm, Monica Watkins
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Title:
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Fall 2003 crab population monitoring: mid-marsh and creekbank abundance based on crab hole counts at GCE marsh, monitoring sites 1-10
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Abstract:
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This data set is the Fall 2003 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 250 m^-2 (+/- 285 s.d.).
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DOI:
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10.6073/pasta/eeb11d9f788d964ab126c9cf1aefc6fc
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Key Words:
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Aquatic Invertebrate Monitoring, Armases, crabs, creek bank, density, Eurytium, fall, intertidal, marshes, mid-marsh, monitoring, mud, permanent plots, population dynamics, Sesarma, Uca
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LTER Core Area:
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Population Studies
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Research Themes:
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GCE2 Q2 - Domain Patterns, GCE3 Area2 - Patterns within the Domain, Aquatic Invertebrate Ecology |
Study Period:
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17-Oct-2003 to 21-Oct-2003
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Study Sites:
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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
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Species References:
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Armases cinereum,
Eurytium limosum,
Sesarma reticulatum,
Uca minax,
Uca pugilator,
Uca pugnax |
Project References:
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Invasive species, Marine invertebrate monitoring |
Downloads:
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Data Table: INV-GCEM-0401 (Main data table for data set INV-GCEM-0401, 80 records)
Access: Public (released 29-Jan-2005)
Metadata: Text (ESA FLED),
XML (Ecological Metadata Language)
Data Formats: Spreadsheet (CSV) [8.67kb], Text File [6.71kb], MATLAB (GCE Toolbox) [547.17kb], MATLAB (Variables) [330.02kb], Text Report [56.18kb]
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>83="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>3128="Q") |
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Statistics:
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Generate script code to retrieve data tables for analysis in: MATLAB, R, SAS, SPSS |
Citation:
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Bishop, Thomas Dale. 2004. Fall 2003 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/eeb11d9f788d964ab126c9cf1aefc6fc
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