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Feeding and trophic ecology of Antarctic toothfish Dissostichus mawsoni in the Amundsen and Dumont D’Urville Seas (Antarctica)

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Abstract

Fisheries ecosystem-based management is an important tool for sustainable harvesting of fisheries worldwide. Knowledge of trophic interactions is crucial since changes in trophic balances can induce severe changes in the structure of marine communities. While advocated for deep-sea fisheries, a lack of studies in the benthopelagic area persist. The Antarctic toothfish, Dissostichus mawsoni, is a top predator inhabiting the Southern Ocean deep-sea and a high-value species in a fishery managed by CCAMLR (Commission for the Conservation of Antarctic Marine Living Resources). Previous studies suggested a geographical variability in its diet, but never studying it in the same year. We analysed stomach contents and stable isotopes of δ15N and δ13C in the muscle of D. mawsoni captured in three fishing areas from the Amundsen and Dumont D’Urville Seas, during the 2016/17 fishing season. Although significant spatial differences were found, five taxa were found in all sites, Antimora rostrata, Macrourus spp., Muraenolepis spp., Moroteuthopsis longimana and Psychroteuthis glacialis. High diversity of prey confirms D. mawsoni as a generalist feeder. Values of δ15N showed similar trophic position across areas, in contrast to the differences found in δ13C values. GLM showed that δ15N and δ13C values varied with otolith length, latitude and the opposite isotope, i.e. δ13C and δ15N respectively. Implications for D. mawsoni fisheries management are discussed considering different predation release scenarios.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

Authors would like to give a special thanks to the crew of the FV Antarctic Discovery, Antarctic toothfish fishing season 2016/2017, for helping JPQ during the fieldwork. Thanks to the National Institute of Water and Atmospheric Research (NIWA) scientists and staff especially Sarah Allen for helping with the import permits to New Zealand, to Jeff Forman and Dr. Katie O’Neill for the help in the identification of gastropods and other taxa, and to Diana Macpherson and colleagues from the NIWA invertebrate collection for the access to the specimens in the collection. We would like to thank Dr. Steve Parker for his valuable comments in an early draft of this manuscript. This project was financially supported by NEP Japan and in New Zealand by Ross-RAMP (MBIE contract C01X1710). This work is an international collaboration under the Scientific Committee on Antarctic Research (SCAR) associated programs, expert, and action groups, namely SCAR AnT-ERA, SCAR EGBAMM and ICED. JPQ would like to thank Australian Longline for allowing his presence onboard of FV Antarctic Discovery. JPQ was supported by FCT/MCTES through national funds (PIDDAC) and Portuguese Polar Program PROPOLAR, and by FCT PhD Scholarship co-financed by FSE (SFRH/BD/144320/2019). BD was supported by an investigation contract (CEECIND/00511/2017). This study benefited from the strategic program of MARE (Marine and Environmental Sciences Centre), financed by FCT (Foundation for Science and Technology (UIDB/04292/2020)). Authors would like to thank both the editors and anonymous reviewers that provide useful comments that improved the quality of the manuscript.

Funding

This project was financially supported by NEP Japan and in New Zealand by Ross-RAMP (MBIE contract C01X1710). Scientific Committee on Antarctic Research (SCAR) associated programs, expert, and action groups, namely SCAR AnT-ERA, SCAR EGBAMM and ICED. Strategic program of MARE (Marine and Environmental Sciences Centre), financed by FCT [Foundation for Science and Technology (UIDB/04292/2020)]. JPQ was supported by FCT/MCTES through national funds (PIDDAC) and Portuguese Polar Program (PROPOLAR), and by FCT PhD Scholarship co-financed by FSE (SFRH/BD/144320/2019). BD was supported by an investigation contract (CEECIND/00511/2017).

Author information

Authors and Affiliations

  1. University of Coimbra, MARE—Marine and Environmental Sciences Centre, Department of Life Sciences, 3000-456, Coimbra, Portugal

    José P. Queirós, Alexandra Baeta, Jaime A. Ramos & José C. Xavier

  2. NIWA—National Institute for Water and Atmospheric Research, 301 Evans Bay Parade, Hataitai, Wellington, 6021, New Zealand

    Darren W. Stevens & Matthew H. Pinkerton

  3. Laboratório Marítimo da Guia, MARE—Marine and Environmental Sciences Centre, Faculty of Sciences, University of Lisbon, Lisbon, Portugal

    Rui Rosa

  4. MARE—Marine and Environmental Sciences Centre, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016, Lisbon, Portugal

    Bernardo Duarte

  5. Departamento de Biologia Vegetal, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016, Lisbon, Portugal

    Bernardo Duarte

  6. BAS—British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge, CB3 0ET, UK

    José C. Xavier

Authors
  1. José P. Queirós
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  2. Darren W. Stevens
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  4. Rui Rosa
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  6. Alexandra Baeta
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  7. Jaime A. Ramos
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  8. José C. Xavier
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Contributions

JPQ: Conceptualization, Design, Data collection, Methodology, Writing—original draft, Writing—review & editing; DWS: Conceptualization, Methodology, Writing—original draft; MHP: Writing—original draft, Writing—review & editing; RR: Methodology, Writing—original draft; BD: Methodology, Writing—original draft; AB: Methodology, Writing—original draft; JAR: Writing—original draft; JCX: Conceptualization, Design, Writing—original draft.

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Correspondence to José P. Queirós.

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Queirós, J.P., Stevens, D.W., Pinkerton, M.H. et al. Feeding and trophic ecology of Antarctic toothfish Dissostichus mawsoni in the Amundsen and Dumont D’Urville Seas (Antarctica). Hydrobiologia 849, 2317–2333 (2022). https://doi.org/10.1007/s10750-022-04871-3

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  • DOI: https://doi.org/10.1007/s10750-022-04871-3

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