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Percorrer por autor "Cores, Claudia"

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  • Biology, abundance and distribution of Pennant’s swimming crab, Portumnus latipes (Pennant, 1777) along the coast of Portugal
    Publication . Cores, Claudia; Gaspar, Miguel; Erzini, Karim
    The biology, ecology and distribution of Pennant's swimming crab (Portumnus latipes) along the coast of Portugal in 2015 was studied. Females dominated the catches and the highest percentage of berried females was recorded between February and April. Mean fecundity values were 7711, 10 004 and 4838 eggs for development stages I, II and III, respectively. Estimated Von Bertalanffy growth parameters L-infinity, K and t(0) were 34.83 mm, 0.52 year(-1) and -0.41 year for males, and 27.16 mm, 0.74 year(-1) and -0.39 year for females, respectively. P. latipes is widely distributed along the Portuguese coast on sandy bottom to a maximum depth of 20 m, with the highest relative abundances from the south coast near estuaries and coastal lagoon inlets. Size distributions differed significantly (p<0.05) between the south and the southwest and northwest regions, with larger crabs in the south. Abundance was generally correlated with abundance of Donax trunculus and Donax vittatus, supporting the hypothesis of a predator-prey relationship.
    2016Artigo científico Acesso restrito Ver mais
  • Estimating the density of Pennant's swimming crab, Portumnus latipes (Pennant, 1777) in the swash zone using baited stakes and area of attraction
    Publication . Cores, Claudia; Gaspar, Miguel; Erzini, Karim
    We used a new, easy to use, highly selective, low impact and cheap method of sampling in the swash zone of a sandy beach to obtain catch per unit effort data (CPUE) for Pennant's swimming crab, Portumnus latipes (Pennant, 1777). Metal stakes baited with sardines were used to attract the crabs that were caught by hand. Crab density was estimated based on area of attraction and maximum CPUE and compared with estimates from bivalve dredges used at depths from 3 to 6.5 m. The baited stake method gave an estimate of 0.026 crabs m(-2), which is comparable to bivalve dredge estimates (0.0059-0.045 crabs m(-2)). This approach can be used for crustaceans, gastropods and other mobile benthic organisms.
    2019-06Artigo científico Acesso restrito Ver mais