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Copepod Assemblages and Diel Vertical Migration In the East China Sea, North of Taiwan

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The western North Pacific north of Taiwan is an area with high oceanographic complexity, both biological and physicochemical. The northward flowing Kuroshio Current passes here and turns northeastward at the break of the East China Sea continental shelf, inducing an upwelling. We used a NorPac plankton net with opening-closing mechanism to take plankton samples at six depth levels (0, 50, 100, 150, 200, and 250 m) in four time series (00:00, 08:00, 15:00, and 21:00 local time) within 24 hours. Planktonic copepods were identified to species level when possible; depth and time of collecting, and abundance in individuals/m3 were recorded. Different patterns of diel vertical migration (DVM) were established for the dominant species, such as normal DVM in Paracalanus aculeatus, Clausocalanus furcatus, Temora discaudata, and Canthocalanus pauper, reverse DVM in Oithona atlantica, no apparent DVM in Oncaea venusta and Subeucalanus mucronatus, and bimodal vertical distribution in Clausocalanus mastigophorus and Cosmocalanus darwini. Four sampling groups and four copepod species assemblages were defined by using cluster analysis. Each of these sampling groups and species assemblages is characterized by a different DVM pattern. Le Pacifique Nord occidental, au nord de Taiwan, est une région d'une grande complexité océanographique, à la fois des points de vue biologique et physico-chimique. Le courant appelé Kuroshio provenant du nord passe ici et tourne vers le nord-est à la limite du plateau continental de la mer de Chine orientale, induisant un upwelling. À l'aide d'un filet à plancton de type NordPac muni d'un dispositif d'ouverture-fermeture, nous avons effectué des prélèvements à six profondeurs (0, 50, 100, 150, 200 et 250 m), quatre fois (à 00:00, 08:00, 15:00, et 21:00, heure locale) par 24 heures. Les copépodes planctoniques ont été identifiés au niveau spécifique autant que possible; la profondeur, l'heure de chaque prélèvement, et l'abondance en nombre d'individus/m3 ont été notées. Différents types de migration verticale journalière (DVM) ont été établis pour les espèces dominantes, ainsi, une DVM normale chez Paracalanus aculeatus, Clausocalanus furcatus, Temora discaudata et Canthocalanus pauper, une DVM inverse chez Oithona atlantica, une DVM non apparente chez Oncaea venusta et Subeucalanus mucronatus et une distribution verticale bimodale chez Clausocalanus mastigophorus et Cosmocalanus darwini. Quatre groupes d'échantillonage et quatre assemblages d'espèces de copépodes ont ainsi été définis en utilisant l'analyse d'ensemble. Chaque groupe d'échantillonnage et chaque assemblage d'espèces est caractérisé par un type différent de DVM.


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