Falkland Islands Government Fisheries Department, P. O. Box 598, Stanley, FIQQ 1ZZ, Falkland Islands.
J Fish Biol. 2013 Nov;83(5):1210-20. doi: 10.1111/jfb.12217. Epub 2013 Sep 6.
Stomach contents of 4808 fishes of 20 species caught in the eastern part of the Patagonian Shelf between 1999 and 2012 were analysed to assess dietary contributions of gelatinous plankton resources. Gelatinous plankton occurred in diets of seven species with two species, Patagonotothen ramsayi and Squalus acanthias, having >10% ctenophores in their diet. Consumption of gelatinous plankton was important in P. ramsayi and was strikingly seasonal, with maximum occurrence (up to 46% of non-empty stomachs) in late summer to autumn. Ctenophores were most abundant in P. ramsayi of 25-34 cm total length, L(T) whereas salps were more frequent in larger >35 cm L(T) individuals. In winter to spring, occurrence of gelatinous plankton in diets was minimal, reflecting their overall seasonal abundance in the ocean. The recent increase in abundance of P. ramsayi has enabled the species to recycle a significant proportion of the ecosystem production from gelatinous dead end to the main muscular food chain via seasonal reliance on ctenophores, jellyfish and tunicates. This additional influx of production that has been diverted from the gelatinous food chain favours the increase in abundance of several piscivorous top predators and affects the trophic web structure of the Patagonian Shelf ecosystem.
2000 年至 2012 年期间，在巴塔哥尼亚陆架东部捕捞的 20 种鱼类的 4808 个胃内容物进行了分析，以评估凝胶状浮游生物资源在饮食中的贡献。有 7 种鱼类的饮食中存在凝胶状浮游生物，其中 2 种，即南极犬牙鱼和灰鲭鲨，其饮食中有超过 10%的栉水母。凝胶状浮游生物在南极犬牙鱼的饮食中很重要，而且具有明显的季节性，在夏末至秋季达到最大值（可达非空胃的 46%）。栉水母在 25-34cm 总长度的南极犬牙鱼中最为丰富，而在较大的>35cm 总长度的个体中更为频繁出现的是樽海鞘。在冬季至春季，饮食中凝胶状浮游生物的出现最少，反映了它们在海洋中的总体季节性丰度。南极犬牙鱼数量的近期增加，使该物种能够通过季节性依赖栉水母、水母和被囊动物，将来自凝胶状食物链末端的大量生态系统产物重新循环到主要的肌肉食物链中。这种从凝胶状食物网中转移出来的额外生产力增加了几种肉食性顶级捕食者的数量，并影响了巴塔哥尼亚陆架生态系统的营养网结构。
