quinta-feira, fevereiro 08, 2007

Grande glaciação do Oligoceno pode ter favorecido os mamíferos

A grande glaciação do Oligoceno, há 33,5 milhões de anos, teve maior impacto no clima do que se julgava e favoreceu os mamíferos, devido à sua resistência às baixas temperaturas, concluiu uma equipa de cientistas norte-americanos, cujo estudo foi publicado na revista "Nature".

O estudo estima em 8,2 graus (com margem de erro de 3,1 graus) a queda das temperaturas médias num período de 400 mil anos.

"A importante alteração das temperaturas médias, muito superior à das temperaturas da superfície dos mares nas mesmas latitudes, explica as alterações da fauna, nos gastrópodes, anfíbios e répteis, enquanto que a maioria dos mamíferos da região não foi afectada", explica a equipa de Alessandro Zanazzi, da Universidade da Carolina do Sul.

Notícia completa: http://www.publico.clix.pt/shownews.asp?id=1285006

13 comentários:

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