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首页> 外文期刊>Polar biology >Diet and daily ration of two nototheniid fish on the shelf of the sub-Antarctic Prince Edward Islands
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Diet and daily ration of two nototheniid fish on the shelf of the sub-Antarctic Prince Edward Islands

机译：在南极爱德华王子岛群岛的架子上，两只Nototheniid鱼的饮食和日粮

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摘要

The seasonal dietary composition and estimates of daily consumption rate of Lepidonotothen larseni and Gobionotothen marionensis juveniles were obtained for the first time using fish collected near sub-Antarctic Prince Edward Islands during April 1999-2003. The diet of L. larseni consisted mainly of pelagic prey, with copepods and arrow worms making up the most significant prey groups and accounting for 46% and 40% of prey mass, respectively. The diet of G. marionensis was more diverse than that of L. larseni and was composed mainly of benthic prey, including bottom-dwelling decapods (Nauticaris marionis) and sedentary polychaetes, which accounted for 54% and 30% of prey mass, respectively. During the present study, dietary overlap between juveniles of L. larseni and G. marionensis was very low (< 5%) indicating that competition for food resources between them was negligible. They not only relied on different prey species, both also exhibited different diel feeding regimes. Daily consumption rate of L. larseni and G. marionensis juveniles was estimated to be 4.5% and 5.2% of body dry mass, respectively. Stomach contents and stable isotope analyses suggested, that both L. larseni and G. marionensis occupy the forth-trophic level of the sub-Antarctic food web but depend mainly on allochthonous and autochthonous (kelp derived) organic matter, respectively.
机译：1999年4月至2003年4月间，在南极爱德华王子岛附近收集的鱼类中首次获得了季节性的饮食成分和估计的鳞翅目小鳞翅目和线虫对虾的日常食用率。 L. larseni的饮食主要由中上层猎物组成，co足类和arrow蠕虫构成最主要的猎物组，分别占猎物质量的46％和40％。马齿G的饮食比拉尔森乳杆菌的饮食更多样化，主要由底栖猎物组成，包括底栖十足纲（Nauticaris marionis）和久坐的多毛cha，分别占猎物质量的54％和30％。在本研究中，L。larseni和G. marionensis幼鱼的饮食重叠非常低（<5％），表明它们之间对食物资源的竞争可以忽略不计。他们不仅依靠不同的猎物种类，而且还表现出不同的迪尔饲喂方式。据估计，L。larseni和G. marionensis少年的日消费率分别为身体干重的4.5％和5.2％。胃内容物和稳定的同位素分析表明，L。larseni和G. marionensis都处于南极食物网的第四营养级，但主要分别依赖于异源和自生（海藻衍生）有机物。

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