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A Comparison of Methods for Estimating Relative Abundance of Grapsid Crabs

Kent, Chandra and McGuinness, Keith (2006). A Comparison of Methods for Estimating Relative Abundance of Grapsid Crabs. Wetlands Ecology and Management,14(1):1-9.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 8 times in Scopus Article | Citations

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IRMA ID 80801907xPUB4
Title A Comparison of Methods for Estimating Relative Abundance of Grapsid Crabs
Author Kent, Chandra
McGuinness, Keith
Journal Name Wetlands Ecology and Management
Publication Date 2006
Volume Number 14
Issue Number 1
ISSN 0923-4861   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-31844436501
Start Page 1
End Page 9
Total Pages 9
Place of Publication Netherlands
Publisher Springer Publishing Company
Field of Research 0502 - Environmental Science and Management
0602 - Ecology
HERDC Category C1 - Journal Article (DEST)
Abstract Grapsid crabs are one of the most common, and potentially important, elements of the mangrove fauna but relatively little information is available on patterns in their distribution and abundance. In part, this may be due to difficulties in estimating the abundance of burrowing species. By not having reliable methods of estimating changes in distribution and abundance of crabs, ecological impacts of crabs may be greatly underestimated. We tested several methods for estimating the apparent abundance of eight species of grapsids in a north Australian mangrove forest. These methods included continuous and instantaneous visual counts at two distances, two types of pitfall traps and photography. We also excavated crabs to test the reliability of the best of these methods. Overall, pitfall traps equipped with funnels proved most useful, although these did preferentially capture larger crabs. An exception was the large crab, Neosarmatium meinerti, which was rarely captured and more reliably estimated by burrow counts. Traps proved to be most useful in this study and may be for long term studies of grapsid species, however, the selection of a method should be made after careful evaluation of the questions and relevant information required for any particular study. Finally, these methods may also prove to be useful in other environments such as salt marshes.
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