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image of Crustaceana

Sampling in the northern Aegean Sea, in depths of 250-1000 m revealed the presence of eight species of pelagic shrimps and gave information on the vertical distribution patterns for some of them. Two species of Pasiphaeoidea (Pasiphaea multidentata, P.sivado), 1 species of Oplophoroidea (Acanthephyra pelagica), 1 Penaeoidea (Gennadas elegans), and 4 Sergestoidea (Sergestes arcticus, S. atlanticus, S. sargassi, and Sergia robusta) were found. The most abundant of these were S. arcticus and G. elegans, with similar abundances, followed by S. robusta and A. pelagica. The other four species had a very low abundance. During daytime, S. arcticus had the widest range of vertical distribution and the bulk of its population occurred at 500 m, while A. pelagica, G. elegans, and S. robusta had less extensive ranges of vertical distribution and the bulk of their populations lay in the zone of 750 m. The vertical distribution of the species found in the Aegean Sea is compared with those of other areas.

Des échantillonnages au nord de la mer Egée, à des profondeurs de 250-1000 m, ont révélé la présence de huit espèces de crevettes pélagiques et ont apporté des informations sur des modèles de répartition verticale pour certains d'entre eux. Deux espèces de Pasiphaeoidea (Pasiphaea multidentata, P.sivado), une espèce d'Oplophoroidea (Acanthephyra pelagica), un Penaeoidea (Gennadas elegans), et quatre Sergestoidea (Sergestes arcticus, S. atlanticus, S. sargassi et Sergia robusta) ont été trouvées. Les plus abondants étaient S. arcticus et G. elegans, avec des abondances analogues, suivies par S. robusta et A. pelagica. Les quatre autres espèces avaient une abondance très faible. Durant la journée, S. arcticus avait la plus large répartition verticale et le maximum de sa population à 500 m tandis que A. pelagica, G. elegans et S. robusta avaient une répartition verticale moins étendue et le maximum de leurs populations dans la zone de 750 m. La répartition verticale des espèces trouvées dans la mer Egée est comparée à celle des autres zones.

Affiliations: 1: Department of Zoology, Aristoteleio University of Thessaloniki, GR-540 06 Thessaloniki, Greece


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