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Environmental change and Antarctic seabird populations
J P Croxall1, P N Trathan, E J Murphy
1British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK. j.croxall@bas.ac.uk
Science (New York, N.Y.)
|August 31, 2002
Summary
Antarctic seabird populations are changing due to climate change, with winter sea-ice significantly impacting species like Adélie and Emperor penguins. These shifts, influenced by warming and historical harvest, may accelerate rapidly.
Area of Science:
- * Ecology and Climate Science: Investigating the intricate relationship between Antarctic ecosystems and climate change dynamics.
Background:
- * Antarctic seabird populations, including Adélie penguins, Emperor penguins, and snow petrels, are sensitive indicators of environmental shifts.
- * Long-term data reveal a significant influence of winter sea-ice extent on these high-latitude species.
Purpose of the Study:
- * To analyze recent changes in Antarctic seabird populations.
- * To determine the influence of regional climate change, particularly sea-ice dynamics, on these populations.
- * To understand the complex and sometimes paradoxical responses of different species and life stages.
Main Methods:
- * Analysis of long-term population data for key Antarctic seabird species.
- * Correlation of population trends with environmental variables, focusing on winter sea-ice extent.
- * Assessment of ecological responses across different breeding and life cycle stages.
Main Results:
- * Winter sea-ice extent profoundly influences Adélie penguins, Emperor penguins, and snow petrels.
- * Observed population effects are inconsistent across species, geographic areas, and life cycle stages.
- * Some population responses to environmental changes appear paradoxical, suggesting complex ecological interactions.
Conclusions:
- * Climate change, specifically alterations in sea-ice, is a major driver of Antarctic seabird population dynamics.
- * The combined pressures of global warming and historical human harvest may lead to abrupt population shifts rather than gradual changes.
- * Further research is needed to fully understand the multifaceted impacts on Antarctic ecosystems.
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