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Temporal and spatial variation in the species composition of trawl samples from a demersal fish community
Author(s) -
Albert O. T.,
Bergstad O. A.
Publication year - 1993
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1993.tb01188.x
Subject(s) - diel vertical migration , demersal zone , demersal fish , biology , sebastes , fishery , variation (astronomy) , spatial variability , bathyal zone , oceanography , ecology , fish <actinopterygii> , geology , statistics , benthic zone , physics , mathematics , astrophysics
The temporal variation in species and size structure of the demersal fish community of a 70–150m deep open coastal locality of SW Norway was studied by multivariate analysis of bottom trawl data both from surveys and from fixed locations sampled repeatedly through 48‐h periods. The trawl data were related to echo recordings from individual tows made during the 48‐h experiments, Between‐site variation was greater than short‐term variation at single sites. Short‐term variation was largely cyclical, diel variation, involving several species. Catches of the numerically dominating species, Sebastes viviparus and Trisopterus esmarki , did not follow any diel patterns. Acoustical recordings suggested that these species undertook diel vertical migrations largely within the lower 5 m of the water column. This corresponds to the vertical opening of the trawl.