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Long-term breeding phenology shift in royal penguins
Ecology and Evolution
|September 8, 2012
Summary
Climate warming impacts breeding times for Antarctic seabirds. While royal penguins breed earlier, other Southern Ocean species breed later, both linked to changing food availability.
Area of Science:
- Ecology
- Climate Change Biology
- Ornithology
Background:
- Global climate change is causing rapid warming and shifts in species distribution and phenology.
- Understanding breeding phenology changes is crucial for assessing population responses to climate shifts.
- Data on phenological shifts are abundant for the Northern Hemisphere but scarce for the Southern Hemisphere marine environment.
Purpose of the Study:
- To quantify changes in royal penguin (Eudyptes schlegeli) breeding phenology in response to climate warming.
- To investigate the relationship between climate variability, resource availability, and seabird breeding timing in the Southern Ocean.
- To identify unifying mechanisms driving phenological trends in Antarctic seabirds.
Main Methods:
- Analysis of a 30-year dataset of surface air temperatures at Macquarie Island.
- Examination of royal penguin egg-laying dates from the 1960s to the 1990s.
- Correlation analysis between the Southern Annular Mode (SAM), sea ice extent, spring productivity, and seabird laying dates.
Main Results:
- Surface air temperatures at Macquarie Island increased by 0.62°C over 30 years.
- Royal penguins commenced egg laying three days earlier in the 1990s compared to the 1960s.
- Five of nine studied Southern Ocean seabird species bred, on average, 2.1 days later compared to the 1950s, linked to lower resource availability.
Conclusions:
- Phenological trends in Antarctic seabirds are driven by resource availability, with decreased food leading to later breeding.
- Royal penguin breeding phenology trends contrast with other Southern Ocean species, yet both are explained by resource availability.
- Climate change impacts on marine resources create divergent phenological responses across Antarctic regions.
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