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Biological Aspects of Medorippe lanata (Linnaeus, 1767) (Brachyura: Dorippidae) from the Eastern Ligurian Sea (Western Mediterranean)

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Abstract

The aim of the present study is to investigate the demographic structure and to identify some aspects of the biology of an exploited population of Medorippe lanata (Brachyura: Dorippidae) in the eastern Ligurian Sea, western Mediterranean. 1364 specimens (639 males and 725 females) of M. lanata were collected on a monthly basis from January to December 2001, in a wide area of the eastern Ligurian Sea usually exploited by the Viareggio ‘rapido’ trawl fleet. M. lanata represented an important fraction of the discard, both in weight and in number of individuals. Maximum abundance of this species occurred in late summer-early autumn (up to 3369 ind. km−2 and 50.6 kg km−2 in August). The overall females:males sex-ratio was 1.13:1, while the monthly sex-ratio did not differ statistically from 1:1 in all months, except in September and October, when females significantly outnumbered males. The sampled population was composed of two cohorts from November to April. Sizes ranged from 10 to 29 mm carapace length (CL) for females and from 9 to 29 mm CL for males. The von Bertalanffy growth curve, computed for both sexes, gave a higher growth rate in males than in females. Recently moulted males and females were observed throughout the year, except in summer, when the highest number of ovigerous females was present. Females with external eggs were collected from March to November, with peaks in August and September. The monthly evolution of the ovarian maturity stages showed no clear temporal trend. At 21 mm CL, 50% of females were ovigerous or showed macroscopically mature ovaries. According to the dimorphism in chelae size, the presence of adult males (post-puberty stage) was observed all year round, from 18 to 29 mm CL, without evident temporal trends.

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Authors and Affiliations

  1. APLYSIA Soc., Coop.-Via delle Viole 1, 57124, Livorno, Italy

    I. Rossetti & B. Francesconi

  2. Centro Interuniversitario di Biologia Marina ed Ecologia Applicata (C.I.B.M.), V.le N. Sauro 4, 57128, Livorno, Italy

    P. Sartor

  3. Dipartimento Territorio e Risorse (Dip. Te. Ris.), Università di Genova, Via Balbi 5, 16126, Genova, Italy

    M. Mori

  4. Dipartimento Scienze Uomo e Ambiente (D.S.U.A.), Università degli Studi di Pisa, Via Volta 6, 56126, Pisa, Italy

    P. Belcari

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  1. I. Rossetti
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  2. P. Sartor
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  3. B. Francesconi
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  4. M. Mori
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  5. P. Belcari
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Correspondence to I. Rossetti.

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Rossetti, I., Sartor, P., Francesconi, B. et al. Biological Aspects of Medorippe lanata (Linnaeus, 1767) (Brachyura: Dorippidae) from the Eastern Ligurian Sea (Western Mediterranean). Hydrobiologia 557, 21–29 (2006). https://doi.org/10.1007/s10750-005-1304-0

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