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Changed prevalence, not absence, explains toothfish status in McMurdo Sound

Published online by Cambridge University Press:  29 November 2016

David G. Ainley ,
Grant Ballard ,
Joseph T. Eastman ,
Clive W. Evans ,
Nadav Nur  and
Claire L. Parkinson
David G. Ainley*
Affiliation:
H.T. Harvey & Associates Ecological Consultants, Los Gatos, CA 95032, USA
Grant Ballard
Affiliation:
Point Blue Conservation Science, Petaluma, CA 94954, USA
Joseph T. Eastman
Affiliation:
Department Biomedical Sciences, Ohio University, Athens, OH 45701, USA
Clive W. Evans
Affiliation:
School of Biological Sciences, University of Auckland, Auckland 1142, New Zealand
Nadav Nur
Affiliation:
Point Blue Conservation Science, Petaluma, CA 94954, USA
Claire L. Parkinson
Affiliation:
Cryospheric Sciences Laboratory/Code 615, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
*
dainley@penguinscience.com
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Abstract

We comment on the conjecture by Parker et al. (2016) that Antarctic toothfish recently returned to McMurdo Sound, arguing that this species never departed. Instead, as deduced from a 40-year fishing effort, toothfish water column prevalence became markedly reduced where bottom depths are <500 m, with research continuing to show their presence on the bottom or above the bottom where depths are deeper. We also counter arguments that toothfish departed, and remained absent, during and following a five-year presence of mega-icebergs residing near the opposite coast of Ross Island, the icebergs inhibiting or fomenting conditions that discouraged toothfish presence in the Sound. Available analyses reveal that toothfish movement into the Sound was probably not significantly affected, and additionally that neither changes in hydrography nor in primary productivity in the Sound would have been sufficient to impact toothfish presence through food web alteration. We hypothesize that the local effect of predation by seals and whales and the regional effect of a fishery targeting the largest toothfish (those neutrally buoyant and thus capable of occupying upper levels of the water column) has resulted in the remaining toothfish now being found predominantly closer to the bottom at greater depths.

Keywords

effects of fishingeffects of predationiceberg B15/C16neutral buoyancyRoss Sea,Weddell seals
Type
Biological Sciences
Information
Antarctic Science , Volume 29 , Issue 2 , April 2017 , pp. 165 - 171
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Copyright
© Antarctic Science Ltd 2016 

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