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GCE-LTER Data Set Summary
Accession:
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INV-GCES-1110
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Research Theme:
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Aquatic Invertebrate Ecology (Directed Study)
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Contributors:
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Brian R. Silliman, John Griffin
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Title:
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Effects of the relative abundance of predatory mud crabs (Panopeus obesus and Eurytium limosum) on abundances of snails and fiddler crabs in a Georgia salt marsh
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Abstract:
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Predatory mud crabs (Panopeus obesus and Eurytium limosum) are two of the main resident infaunal predators in southeastern US salt marshes. Little is known, however, about their effects on important prey species. These influences are llikely to be dependent on the identity and relative abundances of the two predator species. We therefore manipulated the relative abundances of Panopeus and Eurytium in experimental cages in the field (at Airport Marsh, Sapelo Island, GA). We maintained the treatments over 4 months (July - October 2011), before assessing impacts on predator limb loss (an indicator of interspecific antagonism) and prey densitities (small and large mud fiddler crabs and marsh periwinkles).
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DOI:
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10.6073/pasta/e953aa082fb7eedebaaa2bc67f87626a
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Key Words:
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Aquatic Invertebrate Monitoring, Eurytium, Littoraria, Panopeus, predation, salt marshes, speciation, Uca
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LTER Core Area:
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Population Studies
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Research Themes:
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Aquatic Invertebrate Ecology |
Study Period:
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01-Jul-2011 to 01-Oct-2011
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Study Sites:
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Sapelo -- Sapelo Island, Sapelo Island, Georgia
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Downloads:
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Data Table: INV-GCES-1110 (Main data table for data set INV-GCES-1110, 43 records)
Access: Public (released 15-Oct-2013)
Metadata: Text (ESA FLED),
XML (Ecological Metadata Language)
Data Formats: Spreadsheet (CSV) [2.41kb], Text File [1.32kb], MATLAB (GCE Toolbox) [97.53kb], MATLAB (Variables) [67.13kb], Text Report [15.96kb]
Column List:(hide)
Column |
Name |
Units |
Type |
Description |
1 |
Plot |
none |
integer |
Unique number given to each experimental plot in the field |
2 |
Treatment |
none |
string |
Relative abundances of Panopeus: Euytium |
3 |
Snails |
count |
integer |
Final density of snails per cage (Littoraria irrorata); initial was 1500 |
4 |
Flag_Snails |
none |
string |
QA/QC flags for Final density of snails per cage (Littoraria irrorata); initial was 1500 (flagging criteria, where "x" is Snails: x<0="I", x>1500="Q") |
5 |
Fiddlers_small |
count |
floating-point |
Final density of small fiddler crabs (Uca pugnax; holes <8mm diam.) (initial density natural, approx. 3). Average from 2, 30 x 30cm quadrats/plot. |
6 |
Flag_Fiddlers_small |
none |
string |
QA/QC flags for Final density of small fiddler crabs (Uca pugnax; holes <8mm diam.) (initial density natural, approx. 3). Average from 2, 30 x 30cm quadrats/plot. (flagging criteria, where "x" is Fiddlers_small: x<0="I", x>20="Q") |
7 |
Fiddlers_large |
count |
floating-point |
Final density of large fiddler crabs (Uca pugnax; holes >8mm diam.) (initial density natural, approx. 8). Average from 2, 30 x 30cm quadrats/plot. |
8 |
Flag_Fiddlers_large |
none |
string |
QA/QC flags for Final density of large fiddler crabs (Uca pugnax; holes >8mm diam.) (initial density natural, approx. 8). Average from 2, 30 x 30cm quadrats/plot. (flagging criteria, where "x" is Fiddlers_large: x<0="I", x>30="Q") |
9 |
Panopeus_limbs_missing |
ratio |
floating-point |
Average number of missing limbs per Panopeus individual at end of experiment |
10 |
Flag_Panopeus_limbs_missing |
none |
string |
QA/QC flags for Average number of missing limbs per Panopeus individual at end of experiment (flagging criteria, where "x" is Panopeus_limbs_missing: x<0="I", x>10="Q") |
11 |
Eurytium_limbs_missing |
ratio |
floating-point |
Average number of missing limbs per Eurytium individual at end of experiment |
12 |
Flag_Eurytium_limbs_missing |
none |
string |
QA/QC flags for Average number of missing limbs per Eurytium individual at end of experiment (flagging criteria, where "x" is Eurytium_limbs_missing: x<0="I", x>10="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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Silliman, Brian R. 2011. Effects of the relative abundance of predatory mud crabs (Panopeus obesus and Eurytium limosum) on abundances of snails and fiddler crabs in a Georgia salt marsh. Georgia Coastal Ecosystems LTER Project, University of Georgia, Long Term Ecological Research Network. http://dx.doi.org/10.6073/pasta/e953aa082fb7eedebaaa2bc67f87626a
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