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GCE-LTER Data Set Summary

Accession: INV-GCES-0906 Research Theme: Aquatic Invertebrate Ecology (Directed Study)
Contributors: Brian R. Silliman, James Nifong, Daniel Saucedo, Jacob Shalack
Title: Population Study of Geukensia demissa and Ilyanassa obsoleta at the Georgia Coastal Ecosystems LTER site in April 2008
Abstract: During the dates of April 21-April 23, 2008, we conducted surveys to determine the relative abundance of ribbed mussels (Geukensia demissa) and mud snails (Ilyanassa obsoleta) across Spartina height zones. Surveys were performed at each of the GCE long term sites (GCE1-GCE10) and were comprised of transect and quadrat sampling methods. Quadrats measured 25 cm^2 for mud snails and 1 m^2 for ribbed mussels. Ribbed mussel surveys consisted of both transect and quadrat methods. For ribbed mussels, a total of 10 quadrats were randomly placed in tall-, mid-, and short-form Spartina and number of visible mussels counted. Transects for ribbed mussels measured 50 m x 2 m and were performed in intermediate- and short-form Spartina zones. In each transect, we counted observed number of mussel clumps per transect. For mud snails, a total of 10 quadrats were randomly placed in tall- and intermediate-form Spartina and on mud banks (2 m from Spartina edge along the creek bank) and total number of individuals per quadrat were counted.
DOI: 10.6073/pasta/e8c5a1d9e89787573a9174bea48f47d2
Key Words: abundance, density, distribution, Geukensia, Ilyanassa, mollusks, population dynamics, snails, transects
LTER Core Area: Population Studies
Research Themes: GCE2 Q2 - Domain Patterns, Aquatic Invertebrate Ecology, Population Ecology
Study Period: 21-Apr-2008 to 23-Apr-2008
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: Geukensia demissa, Ilyanassa obsoleta
Project References: Patterns of mud snail and ribbed mussel abundance
Downloads: Information

Data Table: INV-GCES-0906 (Main data table for data set INV-GCES-0906, 571 records)

Access: Public (released 16-Jun-2011)

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

Data Formats: Spreadsheet (CSV) [41.70kb],  Text File [34.47kb],  MATLAB (GCE Toolbox) [453.02kb],  MATLAB (Variables) [378.31kb],  Text Report [55.44kb]

Column List:(hide)

Column Name Units Type Description
1 Site none integer Nominal GCE sampling site
2 Species none string Mollusc species counted
3 Zone none string Marsh vegetation zone
4 Method none string Sampling method code
5 Replicate none integer Quadrat or transect replicate
6 Measurement_Type none string Type of abundance measurement
7 Abundance count integer Number of individuals or clusters observed in the quadrat or transect
8 Flag_Abundance none string QA/QC flags for Number of individuals or clusters observed in the quadrat or transect (flagging criteria, where "x" is Abundance: x<0="I", x>200="Q")
9 Tide none string Tide stage at time of observation
10 Date MM/DD/YYYY string Date of observation
11 Time hh:mm string Time of observation
Statistics: Generate script code to retrieve data tables for analysis in: MATLAB, R, SAS, SPSS
Citation: Silliman, Brian R. 2009. Population Study of Geukensia demissa and Ilyanassa obsoleta at the Georgia Coastal Ecosystems LTER site in April 2008. Georgia Coastal Ecosystems LTER Project, University of Georgia, Long Term Ecological Research Network. http://dx.doi.org/10.6073/pasta/e8c5a1d9e89787573a9174bea48f47d2

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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.