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Transition to independence and evidence of extended parental care in the gentoo penguin (Pygoscelis papua)

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Abstract

We used radio telemetry and observations to study the activity patterns and behavior of gentoo penguin chicks at Admiralty Bay, King George Island, South Shetland Islands in 2005 during their “fledging period”; defined as the time between a chick’s first trip to sea and its final dispersal from the breeding colony. Gentoo penguins exhibited delayed dispersal of young and extended parental provisioning, behaviors not observed in other Pygoscelis species. Chicks took their first trip to sea at a mean age of 70 days of age, before finally departing the colony at a mean age of 82 days. During this fledging period, individual chicks made an average of five trips to sea. Trip duration increased significantly as chicks aged, with trips to sea becoming similar to literature values of adult foraging trips in both timing and duration. Behavioral observations and mass dynamics confirmed that many chicks were still being fed during this fledging period, with parental feeding behaviors most often observed in the late afternoon to evening hours. We hypothesize that these behaviors provide an opportunity for chicks to gain experience at sea prior to dispersal and might allow them to develop foraging skills before they are completely independent.

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Acknowledgments

We thank Raytheon Polar Services for logistical support in Antarctica; S. Agius, C. Lin and S. Woods provided field assistance. C. Reiss provided valuable help with the preparation of this manuscript. This manuscript was much improved by the comments of S. Emslie, J. Hinke, A. Miller and four anonymous reviewers. References to trade names do not imply endorsement of these products. This research was funded by a grant to W. Trivelpiece from the US National Science Foundation (OPP 0344275). Additional support from the Lenfest Ocean program of the Pew Charitable Trusts is gratefully acknowledged. This work complies with, and was completed in accordance to, an Antarctic Conservation Act permit provided by the US National Science Foundation.

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Correspondence to Michael J. Polito.

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Communicated by P.W. Sammarco.

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Polito, M.J., Trivelpiece, W.Z. Transition to independence and evidence of extended parental care in the gentoo penguin (Pygoscelis papua). Mar Biol 154, 231–240 (2008). https://doi.org/10.1007/s00227-008-0919-x

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