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GCE-LTER Data Set Summary

Accession: INV-GCEM-2209 Research Theme: Aquatic Invertebrate Ecology (Monitoring)
Contributors: Steven C. Pennings, Dontrece Smith, Elise Diehl, John Williams
Title: Fall 2021 crab population monitoring: mid-marsh and creek bank abundance based on crab hole counts at GCE marsh, monitoring sites 1-10
Abstract: This data set is the Fall 2021 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 creek bank zones (n = 4 per zone) at GCE sites 1 through 10. 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 and Sesarma reticulatum. 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.
DOI: 10.6073/pasta/3f1a65691ccf9459a0f6d05a4dce42f1
Key Words: Animalia, Aquatic Invertebrate Monitoring, Armases, Armases cinereum, Arthropoda, Bilateria, Brachyura, crabs, creek bank, Crustacea, Decapoda, density, Ecdysozoa, Eucarida, Eumalacostraca, Eurytium, Eurytium limosum, fall, GCE, Georgia, Georgia Coastal Ecosystems, Grapsoidea, intertidal, LTER, Malacostraca, marshes, mid-marsh, monitoring, mud, Ocypodidae, Ocypodoidea, Panopeidae, permanent plots, Pleocyemata, population dynamics, Protostomia, Sapelo Island, Sesarma, Sesarma reticulatum, Sesarmidae, Uca, Uca minax, Uca pugilator, Uca pugnax, USA, Xanthoidea
LTER Core Area: Population Studies
Research Themes: GCE2 Q2 - Domain Patterns, GCE3 Area2 - Patterns within the Domain, Aquatic Invertebrate Ecology
Study Period: 11-Oct-2021 to 19-Oct-2021
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: Marine invertebrate monitoring
Downloads: Information

Data Table: INV-GCEM-2209 (Main data table for data set INV-GCEM-2209, 88 records)

Access: Public (released 28-Feb-2023)

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

Data Formats: Spreadsheet (CSV) [2.94kb],  Text File [2.46kb],  MATLAB (GCE Toolbox) [43.36kb],  MATLAB (Variables) [68.43kb],  Text Report [82.98kb]

Column List:(hide)

Column Name Units Type Description
1 Year YYYY integer Calendar year sample was collected
2 Month MM integer Calenday month sample was collected
3 Day DD integer Calendar day sample was collected
4 Site none integer GCE study site code
5 Zone none integer Marsh zone
6 Plot none integer Plot number
7 Quadrat_Area cm^2 floating-point Areal measurement of the quadrat frame
8 Hole_Count Count floating-point Number of crab holes recorded in 625 cm^2 quadrat
9 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: Pennings, Steven C. 2022. Fall 2021 crab population monitoring: mid-marsh and creek bank 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/3f1a65691ccf9459a0f6d05a4dce42f1

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This material is based upon work supported by the National Science Foundation under grants OCE-9982133, OCE-0620959, OCE-1237140 and OCE-1832178. 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.