Sexual dimorphism of a crayfish

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Crawfish are small, lobster-like crustaceans that reside in fresh water around the world. Crawfish belong to the order Decopoda, which includes lobsters and crabs. Approximately species of crawfish reside in North America alone.

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In most cambarid crayfishes, males have longer and heavier chelae than females. Important functions of chelae of Orconectes propinquus include 1 capture and manipulation of prey, 2 defense against predators, 3 inter- and intra-specific interactions, and 4 reproductive activities. In the laboratory, males with large chelae were more likely to survive predation, occupy positions of dominance, and copulate with females, than males with small chelae.

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In most cambarid crayfishes, males have longer and heavier chelae than females. Important functions of chelae of Orconectes propinquus include 1 capture and manipulation of prey, 2 defense against predators, 3 inter- and intra-specific interactions, and 4 reproductive activities. In the laboratory, males with large chelae were more likely to survive predation, occupy positions of dominance, and copulate with females, than males with small chelae.

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Multiple performance traits in animals can be affected by the same morphological feature. Armaments, or morphological weapons, and ornaments, morphological features used to attract mates, can have important influences on individual fitness. For example, ornaments of aquatic animals that improve fighting abilities or reproductive success can increase drag, resulting in decreased swimming performance.

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E-mail: TGL loureiro. Alien species have been transported and traded by humans for many centuries. However, with the era of globalization, biological invasions have reached notable magnitudes.

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Reynolds 2 and P. Dublin, Ireland. Study of the reproductive strategy of crayfish species is of great importance in the current astacological world. In order to bring together the various pieces of information related to this issue, this overview of published scientific reports was conducted.

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Morphometric characters of the sexual dimorphism in the chelae of goneplax rhomboides decapoda brachyura. Investigacion Pesquera 46 2 : The use of the major chelae by reproductive male crayfish Orconectes rusticus for discrimination of female odours.

In species where females mate promiscuously, the reproductive success of males depends both on their ability to acquire mates pre-copulatory sexual selection and ability of their ejaculates to outcompete those of other males post-copulatory sexual selection. Sperm competition theory predicts a negative relationship between investment in body traits favouring mate acquisition secondary sexual characters, SSCs and investment in ejaculate size or quality, due to the inherent costs of sperm production. In contrast, the phenotype-linked fertility hypothesis posits that male fertilizing efficiency is reliably reflected by the phenotypic expression of male SSCs, allowing females to obtain direct benefits by selecting more ornamented males as copulation partners.

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