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  • Author or Editor: Yung-Jen Hu x
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“Capture with a camera!” A non-contact method for obtaining the body size data from ovigerous female land crabs during breeding migration

Abstract

Body size is a crucial metric that is often obtained during the breeding migration of female land crabs. Most commonly, these measurements are obtained by hand but hand-measuring them carries risks for both crabs and researchers. In this study, we developed a novel “photo-image approach” to measure the maximum carapace width of Cardisoma carnifex (Herbst, 1796) in the field, and compared the results with hand measurements. We found a significant relationship in the maximum carapace width measured between the two approaches (Linear regression, p < 0.0001 , r 2 = 0.99 ). The difference (0.54 ± 0.18 mm) and relative error (0.61 ± 0.19%) in the maximum carapace width measured between the two approaches were minimal. We suggest that the photo-image approach is feasible for determining crab size in the field. The approach holds promise for its application in citizen science projects, facilitating advancements in crab research.

Type:
Journal Article
In: Crustaceana
ISSN:
0011-216x
Publication Date:
01 Sep 2023
In:
Volume 96: Issue 9