Incorporating vertical distribution in index standardization accounts for spatiotemporal availability to acoustic and bottom trawl gear for semi-pelagic species

Author:

Monnahan Cole C12ORCID,Thorson James T1ORCID,Kotwicki Stan1ORCID,Lauffenburger Nathan1,Ianelli James N1,Punt Andre E2ORCID

Affiliation:

1. Alaska Fisheries Science Center, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Seattle, WA 98115, USA

2. School of Aquatic and Fishery Sciences, University of Washington, Seattle, WA 98195, USA

Abstract

Abstract Abundance indices from scientific surveys are key stock assessment inputs, but when the availability of fish varies in space and time, the estimated indices and associated uncertainties do not accurately reflect changes in population abundance. For example, indices for many semi-pelagic species rely on acoustic and bottom trawl gear that differ in water column coverage, and so spatiotemporal trends in fish vertical distribution affect the availability of fish to each gear type. The gears together cover the whole water column, and so in principle allow estimation of more accurate, combined indices of the whole population. Here, we extend previous methods and develop a vertically integrated index, which accounts for spatiotemporal correlation and works with data unbalanced spatially or unpaired from distinct surveys. Using eastern Bering Sea walleye pollock (Gadus chalcogrammus) as an example, we identified clear spatial and temporal patterns in vertical distribution and gear availability from 2007 to 2018. Estimated acoustic annual vertical availability ranged from 0.339 to 0.888 among years, and from 0.588 to 0.911 for the bottom trawl survey. Our results highlight the importance of accounting for the spatiotemporal and vertical distribution of semi-pelagic fish to estimate more accurate indices, and provide important context for gear availability.

Funder

Joint Institute for the Study of the Atmosphere and Ocean (JISAO) under NOAA Cooperative Agreement

Publisher

Oxford University Press (OUP)

Subject

Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics,Oceanography

Reference53 articles.

1. Impact of fish distribution and species composition on the relationship between acoustic and swept-area estimates of fish density;Aglen;ICES Journal of Marine Science,1996

2. On the distribution of a positive random variable having a discrete probability mass at the origin;Aitchison;Journal of the American Statistical Association,1955

3. Daylight vertical segregation of young-of-the-year Argentine hake Merluccius hubbsi: advances in assessment of juvenile abundance with acoustic methods;Álvarez-Colombo;Fisheries Research,2014

4. The Bering Sea—a dynamic food web perspective;Aydin;Deep-Sea Research Part II: Topical Studies in Oceanography,2007

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3