期刊
ANTARCTIC SCIENCE
卷 21, 期 6, 页码 571-578出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0954102009990332
关键词
Antarctic climate; bio-element; guano; late Holocene; penguin optimum; sedimentation rate
资金
- National Natural Science Foundation of China [40730107]
- National Science and Technology Supporting Program [2006BAB18B07]
- IPY 2007-2008 China Programme [1PY2008-P05040015-05]
- Australia Antarctic Division [AAD2873]
In order to reconstruct past changes in penguin populations we performed geochemical analyses on a penguin ornithogenic sediment core DG4 retrieved from a lake catchment on Gardner Island, Vestfold Hills. P, Se, F, S, As, Sr and Cu in DG4 were identified as the bio-element assemblage by R-clustering analyses on the elemental concentrations and comparisons with those in bedrock and fresh penguin guano. Factor analysis on the levels of these bio-elements in the core permitted a reconstruction of variations in historical penguin populations at Gardner Island spanning the past 8500 years. The penguin population showed significant fluctuations, reaching its highest density between 4700-2400 calibrated years before present. This coincides with evidence for a late Holocene warm period in the Vestfold Hills, similar to that associated with the late Holocene penguin optimum recorded in the Ross Sea and Antarctic Peninsula regions.
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