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首页> 外文期刊>Marine ecology progress series >Role of small-plankton communities in the diet of two Antarctic octocorals (Primnoisis antarctica and Primnoella sp.)
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Role of small-plankton communities in the diet of two Antarctic octocorals (Primnoisis antarctica and Primnoella sp.)

机译：小浮游生物群落在两个南极八爪鱼（Primnoisis antarctica和Primnoella sp。）的饮食中的作用

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摘要

The diet composition of 2 Antarctic octocorals, Primnoisis antarctica and Primnoella sp., from the shelf of the eastern Weddell Sea (Antarctica) is studied here for the first time. Although mesozooplankton is very scarce in the diet of these organisms, it seems to be important because of its high carbon content. Feeding experiments showed that components of the seston, including the finer fraction of suspended organic matter (ciliates, dinoflagellates and phytoplankton), are also an important part of the octocoral diet. In P. antarctica, the diatom Fragillariopsis spp. accounted for 77% of the total number of cells captured, followed by dinoflagellates (20%), Nitzschia spp. (2%) and ciliates (1%). In Primnoella sp., dinoflagellates were consumed preferentially (92%), followed by ciliates (6%) and centric diatoms (2%). Biomass consumed, however, was low (1.11 x 10~(-5) mgC polyp~(-1) d~(-1) for P. antarctica and 1.34 x 10~(-4) mgC polyp~(-1) d~(-1) for Primnoella sp.). In P. antarctica, small plankton food covers approximately 49% of the daily energy demand. The ability of these suspension feeders to capture small cells at lower concentrations may allow them to remain seasonally active for considerably longer periods than previously thought.
机译：首次在这里研究了来自东部韦德海（南极洲）陆架的2个南极八爪鱼（Antricts antarctica and Primnoella sp。）的饮食组成。尽管中生浮游动物在这些生物的饮食中非常稀缺，但由于其高碳含量，它似乎很重要。进食实验表明，精囊中的有机成分（包括纤毛，纤毛，浮游生物和浮游植物的细小部分）也是八叶饮食的重要组成部分。在南极体育中，硅藻Fragillariopsis spp。占捕获细胞总数的77％，其次是鞭毛藻（20％），Nitzschia spp。 （2％）和纤毛（1％）。在Primnoella sp。中，优先食用鞭毛藻（92％），其次是纤毛虫（6％）和中心硅藻（2％）。然而，南极疟原虫的生物量消耗较低（1.11 x 10〜（-5）mgC polyp〜（-1）d〜（-1）和1.34 x 10〜（-4）mgC polyp〜（-1）d 〜（-1）代表Primnoella sp。）。在南极疟原虫中，小型浮游生物食物可满足约49％的每日能量需求。这些悬浮饲养者捕获低浓度小细胞的能力可能使它们在季节性活动中保持比以前认为的更长的时间。

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