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Sexual traits and reproductive strategy of the leucosiid crab Pyrhila pisum

Published online by Cambridge University Press:  08 September 2020

Satoshi Kobayashi*
Affiliation:
Hakozaki 3-36-36-401, Higashi-ku, Fukuoka City, 812-0053, Japan
Miguel Vazquez Archdale
Affiliation:
Fisheries Resources Sciences Division, Faculty of Fisheries, Kagoshima University, Shimoarata 4-50-20, Kagoshima City, 890-0056, Japan
*
Author for correspondence: Satoshi Kobayashi, E-mail: mokuzuz@rock.odn.ne.jp

Abstract

Mating strategy and sexual dimorphism of morphological traits of the leucosiid crab Pyrhila pisum were elucidated by analysing relative growth patterns of chelipeds and abdomen, and gonad development patterns. Male adults had long chelipeds compared with juvenile males and females. Among male adults, two phases with different slopes could be found in the regression lines; their chelipeds growth pattern changed from negative allometry to positive and longer chelipeds developed in large adults. The growth is more markedly expressed in the merus than in the propodus. Female adults had wider abdominal segments and a thicker body compared with juvenile females and males. Abdomen of females was greatly enlarged by a puberty moult. Male adults had well-developed gonads similar to female adults, and the weights of male gonads were often larger than those of females of the same body size. For adult males, a negative correlation was detected between carapace width and the weight ratio of their gonads, but no significant relationship was detected for adult females. Females had large and well-bloated seminal receptacles, whose weight was nearly equal to gonad weight. There was little difference in the amount of seminal receptacles regardless of the body size of females. There is a trade-off relationship in the development between chelipeds and gonads in adult males. Probably young adult males compensate for the disadvantageous condition of guarding by increasing the number of spermatozoids, and old adult males invest more of their energy to their chelae for guarding while decreasing investment in sperm production.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2020

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