Physical and geochemical responses to bottom trawling on naturally disturbed sediments in the eastern Bering Sea

Stephens, J Drew; McConnaughey, Robert A

doi:10.1093/icesjms/fsae094

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

i

Physical and geochemical responses to bottom trawling on naturally disturbed sediments in the eastern Bering Sea

2024
By Stephens, J Drew ; McConnaughey, Robert A
Source: ICES Journal of Marine Science (2024)

[PDF-1.14 MB]

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Journal Title:

ICES Journal of Marine Science
Personal Author:

Stephens, J Drew ; McConnaughey, Robert A

Stephens, J Drew ; McConnaughey, Robert A Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; OMAO (Office of Marine and Aviation Operations) ; AFSC (Alaska Fisheries Science Center) ; OMAO (Office of Marine and Aviation Operations)

NMFS (National Marine Fisheries Service) ; OMAO (Office of Marine and Aviation Operations) ; AFSC (Alaska Fisheries Science Center) ; OMAO (Office of Marine and Aviation Operations) Less -
Description:

Recent concerns that commercial bottom trawling can contribute to a significant release of sequestered marine carbon have highlighted a need for research in this area. Here, a Before-After Control-Impact (BACI) experimental design was utilized in a previously untrawled area of the eastern Bering Sea. Six pairs of experimental and control corridors were sampled before, after, and 1 year after a trawl disturbance. Each experimental corridor was fished four consecutive times over ∼12 h with a commercial otter trawl. Results were contextualized with minimum detectable effects (MDE), and showed no evidence of a trawl effect on total organic carbon (P = .999, MDE ± 0.05% TOC), total nitrogen (P = .999, MDE ± 0.02% TN), δ13C, and δ15N isotope ratios and sediment size classes. Interannual changes observed in δ15N, sand, silt, and clay are attributed to natural variation. The study suggests that the characteristics of the study site, such as storm disturbances, high sand content, and low carbon content, limited the bottom-trawl effect on sediment composition following this initial trawl disturbance. The findings highlight the importance of site-specific studies that account for local conditions to support best management practices for commercial bottom trawling.
Source:

ICES Journal of Marine Science (2024)
DOI:

https://doi.org/10.1093/icesjms/fsae094
ISSN:

1054-3139;1095-9289;
Format:

PDF
Publisher:

Oxford University Press (OUP)
Document Type:

Journal Article
License:

https://creativecommons.org/publicdomain/zero/1.0/
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CC0 Public Domain
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Submitted
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urn:sha-512:1495a18008fd66cf67d3a45efcea692d8b61aafca257a36a42412c912763c2e3335a283176e420210dc5a4b4dde74db9827ca333291b549a9b1bed0fd9b57855
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https://repository.library.noaa.gov/view/noaa/61851/noaa_61851_DS1.pdf
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Physical and geochemical responses to bottom trawling on naturally disturbed sediments in the eastern Bering Sea

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