全球智库信息集成服务系统(G2TT): Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic.

G2TT

来源类型	Article
规范类型	其他
DOI	10.1093/icesjms/fsq089
	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
出处	ICES Journal of Marine Science 68 (2): 377-389
出版年	2011
语种	英语
摘要	Material collected in summer 2004 from the Mid-Atlantic Ridge between Iceland and the Azores with three pelagic trawls was used to estimate relative catchabilities of common fish, cephalopod, decapod, and jellyfish species. Catchability is defined as the ratio of numbers caught between two trawls, standardized for towed distance. Taxon-specific catchability coefficients were estimated for two large pelagic trawls with graded meshes, using a smaller pelagic trawl with a uniform mesh size as the reference trawl. Two of the trawls were equipped with multiple opening-closing codends that allowed sampling of different depth layers. Generalized linear and mixed models suggest that most of the taxa have catchabilities much lower than expected from the area of opening alone, indicating that only a few species are herded by the large mesh at 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 was highly taxon-specific. Part of this variability can be explained by 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 ecosystem Sampling
URL	http://pure.iiasa.ac.at/id/eprint/9625/
来源智库	International Institute for Applied Systems Analysis (Austria)
引用统计
资源类型	智库出版物
条目标识符	http://119.78.100.153/handle/2XGU8XDN/129336
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.