Evaluating potential changes to the US Chukchi Sea bottom trawl survey design via simulation testing
The US Chukchi Sea consists of the waters off the northwest of Alaska and is a naturally dynamic ice-driven ecosystem. The impacts from climate change are affecting the Arctic marine ecosystem as well as the coastal communities that rely on healthy marine ecosystems. In anticipation of increased eco...
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ftdoajarticles:oai:doaj.org/article:3d6c47aba9464c95807c2b36102bea5b 2023-07-02T03:31:35+02:00 Evaluating potential changes to the US Chukchi Sea bottom trawl survey design via simulation testing Zack S. Oyafuso Lewis A. K. Barnett Margaret C. Siple Daniel W. Cooper Stan Kotwicki 2023-06-01T00:00:00Z https://doi.org/10.3389/fmars.2023.1214526 https://doaj.org/article/3d6c47aba9464c95807c2b36102bea5b EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2023.1214526/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2023.1214526 https://doaj.org/article/3d6c47aba9464c95807c2b36102bea5b Frontiers in Marine Science, Vol 10 (2023) bottom trawl surveys sampling design groundfish Chukchi Sea simulation testing Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2023 ftdoajarticles https://doi.org/10.3389/fmars.2023.1214526 2023-06-11T00:36:37Z The US Chukchi Sea consists of the waters off the northwest of Alaska and is a naturally dynamic ice-driven ecosystem. The impacts from climate change are affecting the Arctic marine ecosystem as well as the coastal communities that rely on healthy marine ecosystems. In anticipation of increased ecosystem monitoring in the area, there is an opportunity to evaluate improved sampling designs for future ecological monitoring of the Chukchi Sea, an area that is sampled less comprehensively compared to other regions in Alaska. This analysis focused on standardized NOAA-NMFS-AFSC bottom trawl surveys (otter and beam trawls) and three types of survey designs: simple random, stratified random, and systematic. First, spatiotemporal distributions for 18 representative demersal fish and invertebrate taxa were fitted using standardized catch and effort data. We then simulated spatiotemporal taxon densities to replicate the three survey design types to evaluate design-based estimates of abundance and precision across a range of sampling effort. Modest increases in precision were gained from stratifying the design when compared to a simple random design with either similar or lower uncertainty and bias of the precision estimates. There were often strong tradeoffs between the precision and bias of the systematic estimates of abundance (and associated variance) across species and gear type. The stratified random design provided the most consistent, reliable, and precise estimates of abundance indices and is likely to be the most robust to changes in the survey design. This analysis provides a template for changing bottom trawl survey designs in the Chukchi Sea and potentially other survey regions in Alaska going forward and will be important when integrating new survey objectives that are more ecosystem-focused. Article in Journal/Newspaper Arctic Chukchi Chukchi Sea Climate change Alaska Directory of Open Access Journals: DOAJ Articles Arctic Chukchi Sea |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
bottom trawl surveys sampling design groundfish Chukchi Sea simulation testing Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
bottom trawl surveys sampling design groundfish Chukchi Sea simulation testing Science Q General. Including nature conservation geographical distribution QH1-199.5 Zack S. Oyafuso Lewis A. K. Barnett Margaret C. Siple Daniel W. Cooper Stan Kotwicki Evaluating potential changes to the US Chukchi Sea bottom trawl survey design via simulation testing |
topic_facet |
bottom trawl surveys sampling design groundfish Chukchi Sea simulation testing Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
The US Chukchi Sea consists of the waters off the northwest of Alaska and is a naturally dynamic ice-driven ecosystem. The impacts from climate change are affecting the Arctic marine ecosystem as well as the coastal communities that rely on healthy marine ecosystems. In anticipation of increased ecosystem monitoring in the area, there is an opportunity to evaluate improved sampling designs for future ecological monitoring of the Chukchi Sea, an area that is sampled less comprehensively compared to other regions in Alaska. This analysis focused on standardized NOAA-NMFS-AFSC bottom trawl surveys (otter and beam trawls) and three types of survey designs: simple random, stratified random, and systematic. First, spatiotemporal distributions for 18 representative demersal fish and invertebrate taxa were fitted using standardized catch and effort data. We then simulated spatiotemporal taxon densities to replicate the three survey design types to evaluate design-based estimates of abundance and precision across a range of sampling effort. Modest increases in precision were gained from stratifying the design when compared to a simple random design with either similar or lower uncertainty and bias of the precision estimates. There were often strong tradeoffs between the precision and bias of the systematic estimates of abundance (and associated variance) across species and gear type. The stratified random design provided the most consistent, reliable, and precise estimates of abundance indices and is likely to be the most robust to changes in the survey design. This analysis provides a template for changing bottom trawl survey designs in the Chukchi Sea and potentially other survey regions in Alaska going forward and will be important when integrating new survey objectives that are more ecosystem-focused. |
format |
Article in Journal/Newspaper |
author |
Zack S. Oyafuso Lewis A. K. Barnett Margaret C. Siple Daniel W. Cooper Stan Kotwicki |
author_facet |
Zack S. Oyafuso Lewis A. K. Barnett Margaret C. Siple Daniel W. Cooper Stan Kotwicki |
author_sort |
Zack S. Oyafuso |
title |
Evaluating potential changes to the US Chukchi Sea bottom trawl survey design via simulation testing |
title_short |
Evaluating potential changes to the US Chukchi Sea bottom trawl survey design via simulation testing |
title_full |
Evaluating potential changes to the US Chukchi Sea bottom trawl survey design via simulation testing |
title_fullStr |
Evaluating potential changes to the US Chukchi Sea bottom trawl survey design via simulation testing |
title_full_unstemmed |
Evaluating potential changes to the US Chukchi Sea bottom trawl survey design via simulation testing |
title_sort |
evaluating potential changes to the us chukchi sea bottom trawl survey design via simulation testing |
publisher |
Frontiers Media S.A. |
publishDate |
2023 |
url |
https://doi.org/10.3389/fmars.2023.1214526 https://doaj.org/article/3d6c47aba9464c95807c2b36102bea5b |
geographic |
Arctic Chukchi Sea |
geographic_facet |
Arctic Chukchi Sea |
genre |
Arctic Chukchi Chukchi Sea Climate change Alaska |
genre_facet |
Arctic Chukchi Chukchi Sea Climate change Alaska |
op_source |
Frontiers in Marine Science, Vol 10 (2023) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2023.1214526/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2023.1214526 https://doaj.org/article/3d6c47aba9464c95807c2b36102bea5b |
op_doi |
https://doi.org/10.3389/fmars.2023.1214526 |
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1770270951371440128 |