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Dietary evidence of trophic segregation between Campbell albatross Thalassarche impavida and grey-headed albatross T. chrysostoma at subantarctic Campbell Island

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Abstract

Diet and trophic relationships of New Zealand albatrosses are poorly known, while comprehensive information on their feeding ecology are needed in an ecological and evolutionary context, but also for effective conservation management. Here, food samples of the sympatric Campbell albatross Thalassarche impavida and grey-headed albatross T. chrysostoma were collected at subantarctic Motu Ihupuku Campbell Island to (1) detail their prey items, (2) investigate segregating mechanisms allowing co-existence, and (3) look at potential overlaps between albatrosses and human activities. Chick food of the two albatrosses overlapped greatly in terms of the most consumed prey species but segregated in terms of prey groups. The most abundant item was epipelagic young-of-the-year Micromesistius australis, a species that is commercially-exploited when adult. The myctophid Electrona carlsbergi and various macrourids constituted other significant fish prey, while juveniles of Moroteuthopsis ingens and Martialia hyadesi were the main squid prey. Campbell albatross fed their chicks more on fish (79% vs. 27% by mass) and grey-headed albatross more on cephalopods (67% vs. 18%). Albatrosses also segregated by their foraging habitats, with Campbell albatross favoring neritic prey and grey-headed albatross oceanic prey from colder waters. A few plastic debris and no fishery-related items were found in food samples, indicating limited interactions with human activities at the time of sample collection. However, the nutritional importance of naturally-caught juvenile M. australis for albatrosses has to be taken into account for a sustainable management of the resource, its predators and the trawl fishery targeting adult fish.

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Data availability

The dataset generated during the current study is available from the corresponding author on reasonable request.

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Acknowledgements

The authors thank G. Hedley, S. Kalish and B. Thompson for assistance in the field, G. James for his help to build a reference collection of fish otoliths and bones, and C. Trouvé for her help in food sample analysis. We also thank Invercargill-based staff from the Department of Conservation, including A. Cox and C. West for their assistance with field preparations. Special thanks to Ngai Tahu and their Murihiku iwi representatives for providing their consent for the work at Motu Ihupuku Campbell Island. The PhD thesis of S.M. Waugh was supervised by P.M. Sagar (NIWA Ltd, Christchurch) and H. Weimerskirch (CNRS, Villiers-en-Bois).

Funding

The project was funded by the National Institute of Water and Atmospheric Research (NIWA Ltd., New Zealand), Department of Conservation (DOC, New Zealand), including the Conservation Services Levy paid by the New Zealand Commercial Fishing Industry, New Zealand Lottery Science Commission, France-New Zealand Cultural Agreement, and the Centre National de la Recherche Scientifique (CNRS, France).

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YC and SW conceived and designed the research. SW collected food samples in the field. YC and SW analyzed food samples, and YC identified prey items. YC drafted the manuscript, and both authors edited, read, and approved it.

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Correspondence to Yves Cherel.

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The authors declare that they have no conflict of interest to disclose.

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Fieldwork was approved by the Department of Conservation (DOC, New Zealand).

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Responsible Editor: Vitor H. Paiva.

This work is dedicated to Peter Prince (1948–1998) from the British Antarctic Survey who died suddenly one year after the fieldwork at Campbell Island in 1997.

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Cherel, Y., Waugh, S.M. Dietary evidence of trophic segregation between Campbell albatross Thalassarche impavida and grey-headed albatross T. chrysostoma at subantarctic Campbell Island. Mar Biol 170, 126 (2023). https://doi.org/10.1007/s00227-023-04267-4

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