Response of indicator species to changes in food web and ocean dynamics of the Ross Sea, Antarctica

Ainley, David G.; Morandini, Virginia; Salas, Leo; Nur, Nadav; Rotella, Jay; Barton, Kerry; Lyver, Phil O'B.; Goetz, Kimberly T.; Larue, Michelle; Foster-Dyer, Rose; Parkinson, Claire L.; Arrigo, Kevin R.; Van Dijken, Gert; Beltran, Roxanne S.; Kim, Stacy; Brooks, Cassandra; Kooyman, Gerald; Ponganis, Paul J.; Shanhun, Fiona; Anderson, Dean P.

doi:10.1017/S0954102024000191

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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

Response of indicator species to changes in food web and ocean dynamics of the Ross Sea, Antarctica

2024
By Ainley, David G. ; Morandini, Virginia ; Salas, Leo ; ...
Source: Antarctic Science, 36(5), 290-318

[PDF-1.55 MB]

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Journal Title:

Antarctic Science
Personal Author:

Ainley, David G. ; Morandini, Virginia ; Salas, Leo ; Nur, Nadav ; Rotella, Jay ; ... More +

Ainley, David G. ; Morandini, Virginia ; Salas, Leo ; Nur, Nadav ; Rotella, Jay ; Barton, Kerry ; Lyver, Phil O'B. ; Goetz, Kimberly T. ; Larue, Michelle ; Foster-Dyer, Rose ; Parkinson, Claire L. ; Arrigo, Kevin R. ; Van Dijken, Gert ; Beltran, Roxanne S. ; Kim, Stacy ; Brooks, Cassandra ; Kooyman, Gerald ; Ponganis, Paul J. ; Shanhun, Fiona ; Anderson, Dean P. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; AFSC (Alaska Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; AFSC (Alaska Fisheries Science Center) Less -
Description:

Most of the Ross Sea has been designated a marine protected area (MPA), proposed ‘to protect ecosystem structure and function’. To assess effectiveness, the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) selected Adélie (Pygoscelis adeliae) and emperor (Aptenodytes forsteri) penguins, Weddell seals (Leptonychotes weddellii) and Antarctic toothfish (Dissostichus mawsoni) as ecosystem change ‘indicator species’. Stable for decades, penguin and seal populations increased during 1998–2018 to surpass historical levels, indicating that change in ecosystem structure and function is underway. We review historical impacts to population trends, decadal datasets of ocean climate and fishing pressure on toothfish. Statistical modelling for Adélie penguins and Weddell seals indicates that variability in climate factors and cumulative extraction of adult toothfish may explain these trends. These mesopredators, and adult toothfish, all prey heavily on Antarctic silverfish (Pleuragramma antarcticum). Toothfish removal may be altering intraguild predation dynamics, leading to competitive release of silverfish and contributing to penguin and seal population changes. Despite decades of ocean/weather change, increases in indicator species numbers around Ross Island only began once the toothfish fishery commenced. The rational-use, ecosystem-based viewpoint promoted by CCAMLR regarding toothfish management needs re-evaluation, including in the context of the Ross Sea Region MPA.
Source:

Antarctic Science, 36(5), 290-318
DOI:

https://doi.org/10.1017/S0954102024000191
ISSN:

0954-1020;1365-2079;
Format:

PDF
Publisher:

Cambridge University Press (CUP)
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by/4.0/
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha-512:772022c883704b907cc04a905e9403c6b7b29fb81361d47255d5dc6d1210eae57b265f1754f624919bc76d982d0552819afa4f0108833348b68bbd4f3ed7d1db
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https://repository.library.noaa.gov/view/noaa/66817/noaa_66817_DS1.pdf
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Response of indicator species to changes in food web and ocean dynamics of the Ross Sea, Antarctica

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