| 来源类型 | Monograph (IIASA Interim Report) |
| 规范类型 | 报告 |
| Catchability of Pelagic Trawls for Sampling Deep-living Nekton in the Mid North Atlantic. | |
| Heino M; Porteiro FM; Sutton TT; Falkenhaug T; Godoe OR; Piatkowski U | |
| 发表日期 | 2011 |
| 出版者 | IIASA, Laxenburg, Austria: IR-11-012 |
| 出版年 | 2011 |
| 语种 | 英语 |
| 摘要 | We use the material collected in summer 2004 from the Mid-Atlantic Ridge between Iceland the Azores with three pelagic trawls to estimate relative catchabilities for the common fish, cephalopod, decapod and jellyfish species. Catchability is defined as the ratio of numbers or weight caught between two trawls, standardised for towed distance. We estimate taxon-specific catchability coefficients for two large pelagic trawls with graded meshes, using a smaller pelagic trawl with uniform mesh size as the reference trawl. Two of the trawls were equipped with multiple opening-closing codends that allowed for sampling in different depth layers. Generalized linear and mixed models suggest that most of the taxa have catchabilities much less than expected from the area of opening alone, indicating that only a few species are herded by the large meshes in the mouth of larger trawls. Catchability coefficients across taxa show a very large spread, indicating that the sampled volume for the larger trawls with graded meshes were highly taxon-specific. Part of this variability can be explained with body size and taxonomic group, the latter probably reflecting differences in body form and behaviour. The catchability estimates presented here form the basis for combining data for quantitative analyses of community structure. |
| 主题 | Evolution and Ecology (EEP) |
| 关键词 | Catchability Gear comparison Mid-Atlantic Ridge Nekton, Pelagic ecosystems Sampling |
| URL | http://pure.iiasa.ac.at/id/eprint/9822/ |
| 来源智库 | International Institute for Applied Systems Analysis (Austria) |
| 资源类型 | 智库出版物 |
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/125831 |
| 推荐引用方式 GB/T 7714 | Heino M,Porteiro FM,Sutton TT,et al. Catchability of Pelagic Trawls for Sampling Deep-living Nekton in the Mid North Atlantic.. 2011. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 资源类型 | 版本类型 | 开放类型 | 使用许可 | ||
| IR-11-012.pdf（181KB） | 智库出版物 | 限制开放 | CC BY-NC-SA | 浏览 | ||
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