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Small interannual variability in the body mass of a seabird with high flight costs

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Abstract

Seabird parents during chick rearing is hypothesized to regulate body mass to reduce flight costs and invest energy in current reproduction. Alcids have 2‒4 times higher wing-loading and higher flight costs than other seabirds. In particular, rhinoceros auklets Cerorhinca monocerata (RHAU) carry the heaviest meals among alcids despite its medium-size, therefore, we expected that they might be more likely to keep their body mass small and within a narrow range during chick rearing. We examined between-breeding stage and interannual variations in RHAU body mass using 27-year monitoring data, then tested whether the interannual variation shown by the coefficient of variation (CV) in body mass during chick rearing was smaller than in other seabirds, and if their body lipid stores were smaller. RHAU during chick rearing have 15‒20 g lower body mass, corresponding to 5‒7% decrease of flight costs, than those during incubation. We found that CV of body mass in RHAU (1.4) was smaller than those of 10 other seabird species (1.7‒7.5), while CVs in provisioning metrics, such as meal mass, chick growth, fledgling mass, and fledging success, were the largest or second largest. RHAU body lipid stores during chick rearing (3.8‒4.0%) was also smaller than six other species (5.7‒9.5%). Results suggest that chick-rearing RHAU maintained a narrow range of body mass with minimum body lipid stores, possibly because of their greater wing-loading and heavier meals. Such constraints on body mass regulation might affect their variable investment in their chicks under environmental variability, as shown large variation in provisioning metrics.

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Data availability

The results of our analyses are presented as the main tables and figures. We have also included the data for mean provisioning metrics or body mass for each species used in this study as supplementary information. The raw data for rhinoceros auklets will be made available upon request.

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Acknowledgements

We thank A. Kato, M. Kuroki, A. Takahashi, K. Iseki, M. Takenaka, T. Kagami, T. Deguchi, K. Matsumoto, D. Ochi, Y. Manabe, H. Nomura, M. Ito, Y. Tanaka, M. Shikata, A. Kubo, N. Sato, H. Hayashi, M. Yamamoto, D.M. Kikuchi, J.B. Thiebot, N. Kokubun, M. Nakaoka, many people involved in seabird monitoring on Teuri Island, and the staff of Akkeshi Marine Station (Hokkaido University) for their field assistance, and M. Aotsuka, R. Yorozuya, and Y. Kusakabe for their hospitality. A. Takahashi, T. Takatsu, O. Yamamura, B. Nishizawa, A. Shoji, N. Nagatani, and E. Iida gave invaluable comments during this study. We also thank to S. Shiomi and M. Taya for sharing the data of seabirds' wing loading collected from literature. We would also like to thank M. Brazil, Scientific English Services, for assistance in the preparation of the manuscript. Finally, we are grateful to the rhinoceros auklets captured to collect data for this study.

Funding

This study was supported by JSPS Grants-in-Aid for Scientific Research (#16108002 and #17370007 to Yutaka Watanuki), the 21st Century Centers of Excellence (COE) program "Neo-Science of Natural History", led by Hisatake Okada, 2017 Summer Institute Program, Hokkaido University (to William J. Sydeman), the Collaborative Research Program of Wildlife Research Center, Kyoto University (#2019-A-13 to Jumpei Okado), and Tohoku Ecosystem-Associated Marine Science (TEAMS) research program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT).

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Contributions

All authors contributed to the study conception and design. Analysis was performed by JO with input from YW. Material preparation and data collection were performed by YW and JO. The first draft of the manuscript was written by JO and revised by JO and YW. All authors read and approved the final manuscript.

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Correspondence to Jumpei Okado.

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The authors declare no conflicts of interest associated with this manuscript.

Ethical approval

The fieldwork was carried out under permits, including ethical issues, from the Ministry of the Environment (591, 248, 88, 040315003, 050318001, 060331001, 070328001, 100303001, 110309001, 120209001, 1302151, 1403031, 1503165, 1603291, 1703211, 1802231, 1902122, 2003043, 1405141, 1504221, 1605123, 1704282) and the Agency for Cultural Affairs (3353, 16-4-1810, 20-4-85, 22-4-2126, 23-4-1990, 24-4-2133, 25-4-2033, 26-4-2188, 27-4-1928, 29-4-18, 29-4-1838, Gan-4-1920), and Animal Ethics Committee of Hokkaido University (09-0021, 16-0054).

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Okado, J., Watanuki, Y. Small interannual variability in the body mass of a seabird with high flight costs. Mar Biol 170, 122 (2023). https://doi.org/10.1007/s00227-023-04271-8

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