Effects of Past Global Change on Life (1995) / Chapter Skim
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Pages 185-185
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This analysis of the land mammal record indicates that climatic shifts represented by first-order changes in the isotopic record are necessary but not sufficient causes of firstorder immigration episodes into the North American continent. Clearly the question of why the continental ecosystem was open to immigration during certain times of isotopic excursions and resilient to others has fundamental significance in understanding the stability of present and future continental ecosystems.
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