Dimorphism and the functional basis of claw strength in six brachyuran crabs

@article{Schenk2001DimorphismAT,
  title={Dimorphism and the functional basis of claw strength in six brachyuran crabs},
  author={S Schenk and Peter C. Wainwright},
  journal={Journal of Zoology},
  year={2001},
  volume={255},
  pages={105-119}
}
By examining the morphological basis of force generation in the chelae (claws) of both molluscivorous and non-molluscivorous crabs, it is possible to understand better the difference between general crab claw design and the morphology associated with durophagy. This comparative study investigates the morphology underlying claw force production and intraspecific claw dimorphism in six brachyuran crabs: Callinectes sapidus (Portunidae), Libinia emarginata (Majidae), Ocypode quadrata (Ocypodidae… Expand
Function, Design, Scaling, and Sexual Differences of Dimorphic Chelae in the Land Crab, Cardisoma Carnifex
TLDR
This study investigated how chelae dimorphism may correlate with specialization in function in the land crab Cardisoma carnifx by comparing field observations of preferential claw usage during diurnal activities to a mechanical model drived from anatomical claw measurements, claw closing effort of captured specimens, and calculations of expected closing force. Expand
Allometric sexual dimorphism in the river crab Potamon fluviatile (Herbst, 1785) (Brachyura: Potamidae)
TLDR
It is confirmed that a form of sexual dimorphism exists in the ontogenetic allometric trajectories of P. fluviatile in both the large and small chelae, these trajectories being related to mechanical aspects in predation, food manipulation, mate acquisition, and between-sex differences in aggressiveness during antagonistic fights. Expand
Crabs grab strongly depending on mechanical advantages of pinching and disarticulation of chela
TLDR
This study revealed that mechanical advantages of pinching efficiency and passive disarticulation resistance were greatest in shell‐crushing chelae, followed by gripping and pinching che lae, whereas the chela size relative to the carapace was not related to differences among these functions. Expand
Claw morphology, claw strength, and fighting behavior in the New River crayfish Cambarus chasmodactylus James, 1966 (Decapoda: Astacoidea: Cambaridae)
TLDR
The functional morphology of a unique claw morphology of the New River crayfish, Cambarus chasmodactylus, is highlighted and initial evidence for how claw form relates to fighting style within decapod crustaceans is provided. Expand
Life history traits and patterns of sexual dimorphism in the freshwater crab Potamon ibericum (Bieberstein, 1809) (Decapoda: Brachyura: Potamidae) from the western Alborz Mountains, Iran
TLDR
The results showed that females reach morphometric maturity at smaller sizes than males, which could be of advantage in the fluctuating environment of their freshwater habitat in order to mate as soon as possible and increase fecundity. Expand
Evolutionary variation in the mechanics of fiddler crab claws
TLDR
Analysis of the morphology and mechanical properties of the claws of 21 species of fiddler crabs from the Pacific, Gulf and Atlantic coasts of the Americas suggests that there has been correlated evolution between force production and armoring, and that there is a tradeoff between claw mechanics for signaling and claws mechanics for fighting. Expand
Functional significance of an unusual chela dimorphism in a marine decapod: specialization as a weapon?
  • T. Claverie, I. Smith
  • Biology, Medicine
  • Proceedings of the Royal Society B: Biological Sciences
  • 2007
TLDR
The arched morphology in M. rugosa appears to have evolved in males by means of sexual selection because it enhanced the function of the chela as a weapon, while retaining functionality for feeding. Expand
Is there a better chela to use for geometric morphometric differentiation in brachyuran crabs? A case study using Pachygrapsus marmoratus and Carcinus maenas
TLDR
Results showed that the right chela of P. marmoratus is more appropriate to use when the goal is to differentiate populations, and suggest that environmental factors, such as diet and parasitism, can be determining shape differentiation. Expand
Regenerated claws of the virile crayfish Faxonius virilis (Hagen, 1870) (Decapoda: Astacidea: Cambaridae) generate weaker pinching forces compared to original claws
TLDR
Investigating the relationship between claw regeneration and claw strength among male and female virile crayfish, Faxonius virilis, found that maximal pinching forces of regenerated claws were weaker than the maximal pinchin forces of original claws in both sexes (36% and 40% weaker in males and females). Expand
Claw asymmetry in crabs: approaching an old issue from a new point of view
TLDR
This study represents one of the first to thoroughly analyse the origin and evolution of heterochely within the Brachyura clade, and demonstrates that claw similarity between two or more species was due mainly to phylogenetic relatedness rather than ecological convergence. Expand
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