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首页> 外文期刊>ICES Journal of Marine Science >The trophic role of the squid Loligo plei as a keystone species in the South Brazil Bight ecosystem
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The trophic role of the squid Loligo plei as a keystone species in the South Brazil Bight ecosystem

机译：鱿鱼Loligo plei在巴西南部Bight生态系统中作为关键物种的营养作用

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摘要

The issue of whether loliginid squid can influence the average structure of marine ecosystems in a keystone role, i.e. a strong effect with relatively low biomass, has not yet been examined. Here, the diet of Loligo plei in inner shelf waters of the South Brazil Bight was examined, as a first step, based on the stomach contents of 2200 squid hand-jigged in shallow water (<30m) and taken as bycatch of shrimp trawlers in deeper water (30-100 m). Diet varied by size, season, and fishing zone. Stomachs were not empty in ～12%, with more empty during winter. The range of mantle lengths of squid caught by jigging (101-356 mm) appeared to differ from the squid trawled (30-236 mm), and the diet also differed. Food categories recorded in deeper water did not include amphipods or polychaetes, but in both fishing areas, fish were the most common prey. The fish prey identified included Trachurus lathami, small pelagic species, trichiurids, and Merluccius hubbsi. Demersal species, such as Ctenosciaena gracilicirrhus, and flatfish were also present. An ecosystem network model is updated through which a mixed-trophic impact matrix and "keystone-ness" indicators were calculated. Loligo plei represents an important link between pelagic and demersal energy pathways, with high indices of keystoneness.
机译：鳞茎类鱿鱼能否以关键作用影响海洋生态系统的平均结构，即具有相对较低生物量的强效作用，这一问题尚未得到研究。在这里，第一步是根据在浅水（<30m）中手动跳动的2200鱿鱼的胃内容物作为巴西拖网虾的副渔获物，检查巴西南部海岸线内架子水域的Loligo plei饮食。更深的水（30-100 m）。饮食因大小，季节和捕鱼区而异。胃中约有12％的人没有空胃，冬季则更多。钓到的鱿鱼的披肩长度范围（101-356毫米）似乎与拖网捕捞的鱿鱼（30-236毫米）不同，并且饮食也有所不同。深水中记录的食物类别不包括两栖动物或多毛类，但在两个渔区中，鱼类都是最常见的猎物。确定的鱼类猎物包括Trachurus lathami，小型中上层鱼类，trichiurids和Merluccius hubbsi。还存在诸如Ctenosciaena gracilicirrhus等海底物种和比目鱼。更新了生态系统网络模型，通过该模型计算了混合营养影响矩阵和“关键性”指标。 Loligo plei代表了上层和深层能量途径之间的重要联系，具有很高的梯形度指标。

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  • 来源
    《ICES Journal of Marine Science》 |2010年第7期|P.1413-1424|共12页
  • 作者

    Maria A. Gasalla; Amanda R. Rodrigues; Felippe A. Postuma;

  • 作者单位

    Fisheries Ecosystems Laboratory (LabPesq), Department of Biological Oceanography, Instituto Oceanografico, University of Sao Paulo, Praca do Oceanografico 191, Sao Paulo, 05508-120 SP, Brazil;

    rnFisheries Ecosystems Laboratory (LabPesq), Department of Biological Oceanography, Instituto Oceanografico, University of Sao Paulo, Praca do Oceanografico 191, Sao Paulo, 05508-120 SP, Brazil Aquaculture and Fisheries Graduate Programme, Instituto de Pesca, Avenida Francisco Matarazzo 455, Sao Paulo, 05001-900 SP, Brazil;

    rnFisheries Ecosystems Laboratory (LabPesq), Department of Biological Oceanography, Instituto Oceanografico, University of Sao Paulo, Praca do Oceanografico 191, Sao Paulo, 05508-120 SP, Brazil Aquaculture and Fisheries Graduate Programme, Instituto de Pesca, Avenida Francisco Matarazzo 455, Sao Paulo, 05001-900 SP, Brazil;

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  • 正文语种 eng
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  • 关键词

    diet; fisheries; foodweb; keystoneness; modelling; multispecies interactions;

    机译：饮食;渔业;食物网;重点造型;多物种相互作用;

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