期刊
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
卷 70, 期 2, 页码 294-306出版社
CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
DOI: 10.1139/cjfas-2012-0330
关键词
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资金
- University of Washington
- NMFS-Sea Grant Population Dynamics Fellowship [NA09OAR4170120]
- NMFS via NOAA Cooperative Agreement [354 NA17RJ1232]
- Joint Institute for the Study of the Atmosphere and Ocean (JISAO) under NOAA Cooperative Agreement [NA10OAR4320148, 2027]
Bottom trawl sampling is used to estimate trends in stock abundance for groundfishes worldwide, including Pacific rockfishes (Sebastes spp.). However, trawl sampling efficiency varies spatially and the distribution of groundfish populations may change among easy-and difficult-to-survey areas over time. These concerns have prompted interest in using underwater vehicles (UVs), for which catchability is likely to decrease less in rocky habitats. In this study, we use simulation modeling to evaluate the abundance trends arising from bottom trawl sampling given density-dependent habitat selection and spatially varying catchability. We first demonstrate that relative abundance indices in this case will generally be biased measures of changes in population abundance. We also propose and evaluate a sampling design that combines data from bottom trawl and UV gears. Combined sampling has greater precision than UV sampling, lower bias than bottom trawl sampling, and is robust to moderately violated assumptions regarding sampling strata or spatial catchability. We conclude by recommending future research that could test the assumptions under which combined sampling is a feasible solution to spatially varying catchability.
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