Labrousse, S and Fraser, AD and Sumner, M and Le Manach, F and Sauser, C and Horstmann, I and Devane, E and Delord, K and Jenouvrier, S and Barbraud, C, Landfast ice: a major driver of reproductive success in a polar seabird, Biology Letters, 17, (6) Article 20210097. ISSN 1744-9561 (2021) [Refereed Article]
© 2021 The Author(s) Published by the Royal Society. All rights reserved.
In a fast-changing world, polar ecosystems are threatened by climate variability. Understanding the roles of fine-scale processes, and linear and nonlinear effects of climate factors on the demography of polar species is crucial for anticipating the future state of these fragile ecosystems. While the effects of sea ice on polar marine top predators are increasingly being studied, little is known about the impacts of landfast ice (LFI) on this species community. Based on a unique 39-year time series of satellite imagery and in situ meteorological conditions and on the world's longest dataset of emperor penguin (Aptenodytes forsteri) breeding parameters, we studied the effects of fine-scale variability of LFI and weather conditions on this species' reproductive success. We found that longer distances to the LFI edge (i.e. foraging areas) negatively affected the overall breeding success but also the fledging success. Climate window analyses suggested that chick mortality was particularly sensitive to LFI variability between August and November. Snowfall in May also affected hatching success. Given the sensitivity of LFI to storms and changes in wind direction, important future repercussions on the breeding habitat of emperor penguins are to be expected in the context of climate change.
|Item Type:||Refereed Article|
|Keywords:||Antarctica, landfast sea ice, emperor penguins, breeding success, climate window analysis, nonlinear effect|
|Research Division:||Biological Sciences|
|Research Field:||Behavioural ecology|
|Objective Division:||Environmental Policy, Climate Change and Natural Hazards|
|Objective Group:||Understanding climate change|
|Objective Field:||Effects of climate change on Antarctic and sub-Antarctic environments (excl. social impacts)|
|UTAS Author:||Fraser, AD (Dr Alex Fraser)|
|Web of Science® Times Cited:||1|
|Deposited By:||Australian Antarctic Program Partnership|
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