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DISTRIBUTION ET ABONDANCE DES CRUSTACÉS DÉCAPODES DU TALUS CONTINENTAL (200-900 M) DE GUYANE FRANÇAISE DISTRIBUTION AND ABUNDANCE OF DECAPOD CRUSTACEANS OF THE CONTINENTAL SLOPE (200-900 M) OF FRENCH GUIANA

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In order to establish the distribution and abundance of decapod crustaceans on the continental slope of French Guiana, 84 bottom trawl hauls were carried out at depths between 400 and 900 m. A total of 32 species were identified including 9 Penaeidea, 13 Caridea, 2 Palinura, 2 Macrura, 2 Anomura, and 4 Brachyura. The deep-sea decapod fauna of Guiana (western central Atlantic) is quite similar to that of the north western Atlantic. This study has highlighted the existence of bathymetric zonation and well-pronounced species succession; this phenomenon would appear to be conditioned by physical environmental factors, especially temperature. Despite the high species richness in decapods, most species showed a low count (mean catch rates < 1 kg/h/net), and only two of them comprised more than 60% of total captures for decapods. These two dominant species are the solenocerid shrimp Solenocera acuminata caught at a depth of about 200 m where catch rates reach 9.5 kg/h, and the aristeid shrimp Aristaeopsis edwardsiana (= Plesiopenaeus edwardsianus), widely distributed from 400 to 900 m with a peak abundance near 700 m where mean catch rates are about 8.9 kg/h. De façon à établir les distributions et les abondances des crustacés décapodes du talus continental de Guyane française, 84 chalutages benthiques ont été effectués sur les fonds de 200 à 900 m. Un total de 32 espèces ont été identifiées, à savoir 9 Penaeidea, 13 Caridea, 2 Palinura, 2 Macrura, 2 Anomura et 4 Brachyura. La faune profonde de décapodes de Guyane (Atlantique central de l'ouest) est très similaire à celle de l'Atlantique Nord-Ouest. L'étude met en évidence une zonation bathymétrique et une succession d'espèces bien marquées; ce phénomène semble conditionné par les facteurs physiques environnementaux, surtout la température. Malgré la richesse spécifique élevée en décapodes, la plupart des espèces présentent des abondances faibles (rendements de chalutage moyens < 1 kg/h/chalut), et deux espèces constituent à elles seules plus de 60% des captures totales en décapodes. Ces deux espèces dominantes sont la crevette Solenoceridae Solenocera acuminata capturée vers 200 m ou les rendements atteignent 9,5 kg/h, et la crevette Aristeidae Aristaeopsis edwardsiana (= Plesiopenaeus edwardsianus), largement distribuée de 400 à 900 m avec un maximum d’abondance vers 700 m ou les rendements moyens sont d’environ 8,9 kg/h.

Affiliations: 1: Laboratoire d'Océanologie Biologique, Université de Bretagne Occidentale, F-29287 Brest Cedex, France

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/content/journals/10.1163/156854000504723
2000-07-01
2016-12-06

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