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Population characteristics of the crab Monodaeus couchii (Crustacea, Brachyura, Xanthidae) in the Western Mediterranean

Authors
Publisher
Museu de Ciències Naturals de Barcelona
Publication Date
Disciplines
  • Biology

Abstract

P O P U L A T I O N C H A R A C T E R I S T I C S O F T H E C R A B M O N O D A E U S C O U C H I I ( C R U S T A C E A , B R A C H Y U R A , XANTHIDAE) IN THE WESTERN MEDITERRANEAN 1 l Mori, M., Abelló, P., Mura, M. & De Ranieri, S., 1995. Population characteristics of the crab Monodaeus couchii (Crustacea, Brachyura, Xanthidae) in the Western Mediterranean. Misc. Zool., 18: 77-88. Population characteristics of the crab Monodaeus couchii (Crustacea, Brachyura, Xanthidae) in the Western Mediterranean.- Some aspects of the biology of the bathyal crab Monodaeus couchii from the North Tyrrhenian Sea, Sardinian Channel and Catalan Sea (Western Mediterranean) have been studied. The occurrence depth range has been found to be of betwe- en 80 and 748 m. The sex-ratio was found to be highly biassed towards males in the three study areas. The crabs are sexually dimorphic, adult males being larger than adult females. There appears to be seasonality in reproduction: ovigerous females were only collected in October, November and December. Puberty moult, as determined by morphological changes of the che- lae, takes place in males within a size range of 11-16 mm carapace length. This species is hete- rochelic, with most males being right-handed. M. couchii is an opportunistic predator but seems to be also able of deposit feeding and scavenging. Key words: Brachyura, Xanthidae, Monodaeus, Distribution, Population biology. (Rebut: 11 XI 94; Acceptació condicional: 21 11 95; Acc. definitiva: 27 VI1 95) Mario Mori, Istituto di Anatomia Comparata delllUniversita, viale Benedetto XV 5, 16132 Genova, Italia (1talyJ.- Pere Abelló, Institut de Ciencies del Mar (CSIC), Passeig Joan de Borbó s/n., 08039 Barcelona, Espanya (Spain).- Marco Mura, Dipartimento di Biologia Animale ed Ecologia, Universitd degli Studi di Cagliari, Viale Poetto 1, Cagliari, ltalia (Italy).- S. de Ranieri, Dipartimento di Scienze delllAmbiente e del Territorio dell'Universita, via A. Volta 6, 56100 Pi

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