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首页> 外文期刊>Aquatic Biology >Vertical distribution, behavior, chemical composition and metabolism of Stauroteuthis syrtensis (Octopoda: Cirrata) in the northwest Atlantic
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Vertical distribution, behavior, chemical composition and metabolism of Stauroteuthis syrtensis (Octopoda: Cirrata) in the northwest Atlantic

机译：西北大西洋剑藻（Stauroteuthis syrtensis（Octopoda：Cirrata））的垂直分布，行为，化学成分和代谢

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ABSTRACT: The cirrate octopod Stauroteuthis syrtensis is a mesopelagic species commonly collected in the North Atlantic. Individuals were observed at depths 600 m and typically within 100 m of the bottom in three ~900 m deep canyons indenting the southern edge of Georges Bank. When first sighted, most octopods were floating passively with their webbed arms gathered into a small ball. When disturbed, they expanded their webs to form a ‘balloon’ shape, swam slowly by sculling their fins, pulsed their webs like medusae and, in some cases, streamlined their arms and webs and moved away smoothly by rapidly sculling their fins. The bodies of 9 octopods comprised 92 to 95% water, with tissue containing 9 to 22% carbon (C) and 2 to 4% nitrogen (N). These values were similar to those reported for medusae and ctenophores. Oxygen (O2) consumption rates of 4.6 to 25.8 µmol O2 g–1 C h–1 were within ranges reported for medusae, ctenophores, and deep-water cephalopods. The stomachs of S. syrtensis, dissected immediately after capture, contained only the calanoid copepod Calanus finmarchicus. Calculations indicated that S. syrtensis need 1.3 to 30.1 ind. d–1 of C. finmarchicus to meet their measured metabolic demand. Excretion rates (0.3 to 12.4 µg NH4+ g–1 C h–1 and 0.06 to 4.83 µg PO43– g–1 C h–1) were at least an order of magnitude lower than rates reported for other octopods or gelatinous zooplankters. O:N ratios (11 to 366) suggested that S. syrtensis catabolized lipids, which may be supplied by C. finmarchicus. Vertical distribution, relatively torpid behavior and low metabolic rates characterized S. syrtensis as a benthopelagic and relatively passive predator on copepods.
机译：摘要：Cirrate octopod Stauroteuthis syrtensis 是一种常见于中大西洋的物种，通常收集于北大西洋。在大于600 m的深度处观察到的个体，通常在三个约900 m的深凹处，位于乔治斯银行南部边缘的底部，距底部100 m以内。初次见到时，大多数章鱼都被动地漂浮着，手蹼聚集成一个小球。当受到干扰时，它们将网扩张成“气球”形状，通过划动鳍片缓慢游动，像水母一样对它们的脉动进行脉动，在某些情况下，通过快速划动鳍片简化臂和网并平稳地移开。 9个章鱼的身体包含92％到95％的水，组织中含有9％到22％的碳（C）和2-4％的氮（N）。这些值与报道的水母和尾足类动物的值相似。氧气（O 2 ）消耗率为4.6至25.8 µmol O 2 g –1 C h –1 在报道的水母、,足类和深水头足类动物的范围内。 S 的肚子。捕获后立即将其解剖的 syrtensis 仅包含cal足类pe足动物 Calaus finmarchicus 。计算表明 S 。 syrtensis 需要1.3至30.1 ind。 C 的d –1 。 finmarchicus 来满足他们测得的代谢需求。排泄速率（0.3 <12.4 µg NH 4 + g –1 C h -1 和0.06至4.83 µg PO 4 3 – g –1 C h –1 ）至少比速率低一个数量级报道了其他章鱼或胶状浮游动物。 O：N比（11：366）表示 S 。 syrtensis 分解脂质，可以由 C 提供。 finmarchicus 。垂直分布，相对较热的行为和低代谢率是 S 的特征。 syrtensis 是co足类的底栖鱼类和相对被动的捕食者。

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