Growth analysis and population size estimation of coconut crabs based on a large recapture dataset

Oka, Shin-ichiro; Tokutake, Koji; Inoue, Tatsuo

doi:10.18353/crustacea.50.0_145

Cited by 1 publication

(2 citation statements)

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“…The coconut crab was male, and its thoracic length and body weight were 65.7 mm and 1650 g, respectively. This crab was estimated to be an adult 20-26 years old based on the growth model of the southern Japan population [22]. The removed left claw was frozen, transported to National Institute for Materials Science in Tsukuba, and stored at −18 • C prior to analysis.…”

Section: Sample Preparationmentioning

confidence: 99%

“…We also confirmed that some released crabs live normally in wild conditions based on our preliminary study. We have been conducting 15 years of ecological monitoring of wild populations based on individual identification [22,23]. We could find the injured crabs, lacking claws and legs, and confirm their recovery in many cases sometimes.…”

Section: Sample Preparationmentioning

confidence: 99%

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Columnar Structure of Claw Denticles in the Coconut Crab, Birgus latro

et al. 2022

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Some decapod crustaceans have tooth-like white denticles that exist only on the pinching side of claws. We revealed the denticle microstructure in the coconut crab, Birgus latro, using optical and scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and a focused ion beam (FIB)-SEM. Three-dimensional analysis and fracture surface observation were performed in order to clarify the microstructural differences in two mineralized layers—the exocuticle and the endocuticle. The denticles consist of a columnar structure normal to the surface and are covered with a very thin epicuticle and an exocuticle with a twisted plywood pattern structure. Due to abrasion, the exocuticle layer was lost in the wide area above the large denticles; conversely, these layers remained on the surface of the relatively small denticles and on the base of the denticle. The results showed that the mineralized exoskeleton of the crab’s claw is classified into three structures: a twisted plywood pattern structure stacked parallel to the surface for the exocuticle, a porous structure with many regularly arranged pores vertical to the surface for the endocuticle, and a columnar structure vertical to the surface for the denticle.

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Section: Sample Preparationmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%