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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

In: Crustaceana
Authors:
Chia-Hsuan Hsu Biodiversity Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan

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https://orcid.org/0000-0002-5128-5902
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Kent A. Hatch Department of Biology, Long Island University — Post, Brookville, NY, U.S.A.

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https://orcid.org/0000-0001-9486-2207
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Wenbe Hwang Department of Ecology and Environmental Resources, National University of Tainan, 33 Su-Lin Street, Section 2, Tainan 700, Taiwan

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https://orcid.org/0000-0002-8918-6678
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Chung-Chieh Chang Department of Ecology and Environmental Resources, National University of Tainan, 33 Su-Lin Street, Section 2, Tainan 700, Taiwan

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https://orcid.org/0009-0000-3924-0413
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Chia-Chun Liu Department of Ecology and Environmental Resources, National University of Tainan, 33 Su-Lin Street, Section 2, Tainan 700, Taiwan

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Wei-You Huang Department of Ecology and Environmental Resources, National University of Tainan, 33 Su-Lin Street, Section 2, Tainan 700, Taiwan

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Chung-Jui Kao Department of Ecology and Environmental Resources, National University of Tainan, 33 Su-Lin Street, Section 2, Tainan 700, Taiwan

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Yung-Jen Hu Department of Ecology and Environmental Resources, National University of Tainan, 33 Su-Lin Street, Section 2, Tainan 700, Taiwan

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Chia-Hsin Cheng Department of Ecology and Environmental Resources, National University of Tainan, 33 Su-Lin Street, Section 2, Tainan 700, Taiwan

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Yuan-Mou Chang Department of Ecology and Environmental Resources, National University of Tainan, 33 Su-Lin Street, Section 2, Tainan 700, Taiwan

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https://orcid.org/0000-0002-2804-9266
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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.

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