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Euphausiid biomass in the Arctic Ocean

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Euphausiids collected in the epipelagic (0-100 m) during the summer expeditions of the R/V "Polarstern" to the Arctic Ocean in 1993 (ARKTIS IX/4), 1995 (ARKTIS XI/1), and 1996 (ARKTIS XII) where analysed for regional patterns in biomass and species distribution. Wet (formalin) biomass of euphausiids in the upper 100 m ranged between 29.2 and 4 422.4 mg m−2. The lowest biomass (<100 mg m−2) occurred in the Franz Josef Land region, in Vilkitsky Strait, and in the Lomonosov Ridge area; maximal biomass was determined in the northern part of the shallow Laptev Sea. Thysanoessa raschii, T. inermis, and T. longicaudata occurred in the shallow area, whereas T. longicaudata became important in the deeper regions (>1 000 m). The results are discussed and compared with previous data, and also in view of the hydrological situation in the Arctic Ocean in the 1990s. L'analyse de la biomasse et de la distribution des espèces d'Euphausiacés collectés dans la zone épipélagique (0-100 m) a été effectuée sur le matériel obtenu dans le secteur occidental de l'Arctique (de la terre de François Joseph jusqu'aux îles de Novosibirsk) au cours des expéditions du "Polar Stern" (ARKTIS IX/4 — 1993, ARKTIS XI — 1995, et ARKTIS XII — 1996). La biomasse des Euphausiacés varie entre 29,2 et 4 422,4 mg m−2. Les valeurs les plus basses (< 100 mg m−2) sont observées dans la région de la terre de François Joseph, dans le détroit de Vilkitsky et au niveau de la crête de Lomonosov; les biomasses maximum ont été obtenues dans le nord de la mer de Laptev. Thysanoessa raschii, T. inermis et T. longicaudata sont présents dans les zones peu profondes, cependant T. longicaudata devient abondant dans les zones profondes (plus de 1000 m). Les résultats sont discutés et comparés avec les données antérieures et au vu de la situation hydrologique de l'océan Arctique dans les années 1990.


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