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Article Dans Une Revue Proceedings of the Royal Society B: Biological Sciences Année : 2024

Food chain without giants: modelling the trophic impact of bowhead whaling on little auk populations in the Atlantic Arctic

Résumé

In the Atlantic Arctic, bowhead whales (Balaena mysticetus) were nearly exterminated by European whalers between the seventeenth and nineteenth centuries. The collapse of the East Greenland–Svalbard–Barents Sea population, from an estimated 50 000 to a few hundred individuals, drastically reduced predation on mesozooplankton. Here, we tested the hypothesis that this event strongly favoured the demography of the little auk (Alle alle), a zooplanktivorous feeder competitor of bowhead whales and the most abundant seabird in the Arctic. To estimate the effect of bowhead whaling on little auk abundance, we modelled the trophic niche overlap between the two species using deterministic simulations of mesozooplankton spatial distribution. We estimated that bowhead whaling could have led to a 70% increase in northeast Atlantic Arctic little auk populations, from 2.8 to 4.8 million breeding pairs. While corresponding to a major population increase, this is far less than predicted by previous studies. Our study illustrates how a trophic shift can result from the near extirpation of a marine megafauna species, and the methodological framework we developed opens up new opportunities for marine trophic modelling.
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hal-04674982 , version 1 (22-08-2024)

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  • HAL Id : hal-04674982 , version 1

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Amaury Thepault, Ana S. L. Rodrigues, Laetitia Drago, David Grémillet. Food chain without giants: modelling the trophic impact of bowhead whaling on little auk populations in the Atlantic Arctic. Proceedings of the Royal Society B: Biological Sciences, 2024, 291 (2029), pp.20241183. ⟨hal-04674982⟩
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