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Please use this identifier to cite or link to this item: http://hdl.handle.net/2237/25332

Title: Crabs grab strongly depending on mechanical advantages of pinching and disarticulation of chela
Authors: Fujiwara, Shin-ichi
Kawai, Hiroki
Issue Date: Oct-2016
Publisher: Wiley
Citation: JOURNAL OF MORPHOLOGY. v.277, n.10, 2016, p.1259-1272
Abstract: A small morphological variation of an organ may cause a major change of its function in animal evolution. The function of decapod chela varies considerably among taxa, between sex, and even within an individual, but also retains a simple mechanism of motion. Therefore, the decapod chela is a suitable structure to study the evolutionary process of functional diversifications, although the relationship of form and function is inadequately understood, yet. We estimated the mechanical advantages of pinching and passive disarticulation resistance, and chela size relative to the carapace in 317 chelae of 168 decapod specimens, and compared these indices with the functions of each chela. Our study revealed that mechanical advantages of pinching efficiency and passive disarticulation resistance were greatest in shell-crushing chelae, followed by gripping and pinching chelae, whereas the chela size relative to the carapace was not related to differences among these functions. We also found that the chelae are designed to retain the ratio between depth and width of the proximal dactylus. In the evolutionary process of decapods, the diversifications of chela functions were accompanied by the diversifications of the mechanical advantages, and played an essential role in their ecological diversification. J. Morphol. 277:1259–1272, 2016.
URI: http://doi.org/10.1002/jmor.20573
ISSN: 0362-2525
Rights: "This is the peer reviewed version of the following article: [Fujiwara, S.-i. and Kawai, H. (2016), Crabs grab strongly depending on mechanical advantages of pinching and disarticulation of chela. Journal of Morphology, 277: 1259–1272. doi:10.1002/jmor.20573 ], which has been published in final form at [http://doi.org/10.1002/jmor.20573]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving."
Appears in Collections:1.学術雑誌(博物館)

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