Abstract
Understanding spatio-temporal variation in the abundance of species’ populations is an issue of central importance in ecology. Recent studies of decadal-scale change in Adélie penguin (Pygoscelisadeliae) populations around the Antarctic continent have led to insights into our understanding of the species’ population dynamics and to exploration of the ecosystem processes driving them. However, gaps in knowledge of population change still exist for many populations, especially at breeding sites distant from research stations. In this study, we estimate population change for the large Adélie penguin populations at the seldom visited and data-poor Scullin and Murray Monoliths in East Antarctica by critically assessing historical population data and extending the historical time series of population data to the present day with a recent survey. Unlike Adélie penguin populations studied elsewhere in East Antarctica, we find the Monolith populations have remained stable or decreased slightly over the past 3–4 decades. The results indicate that spatially divergent processes are driving Adélie penguin population dynamics, and that these factors may not be sufficiently represented in current explanatory or predictive population models for this species. The methods employed here provide a viable means of undertaking regular population monitoring of highly visible seabird species such as the Adélie penguin in remote and ecologically important areas such as Scullin and Murray Monoliths in the future.
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Acknowledgements
We thank the numerous staff and expeditioners from the Australian Antarctic program who facilitated survey work, camera fleet management and image processing for adjustment data. Comments from Australian Antarctic Division staff, Jefferson Hinke, and two anonymous reviewers improved the manuscript.
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There are no conflicts of interest related to this work. The work was conducted under AAS projects 2722 and 4088 in accordance with permits issued under the Antarctic Treaty (Environmental Protection) Act 1980 and was approved by the Australian Antarctic Ethics Committee.
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Southwell, C., Emmerson, L. Constraint in the midst of growth: decadal-scale Adélie penguin (Pygoscelis adeliae) population change at Scullin and Murray Monoliths diverges from widespread increases across East Antarctica. Polar Biol 42, 1397–1403 (2019). https://doi.org/10.1007/s00300-019-02527-y
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DOI: https://doi.org/10.1007/s00300-019-02527-y