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Titre : |
Amazonian and neotropical plant communities on glacial time-scales : the failure of the aridity and refuge hypotheses
|
Auteur(s) : |
P.A. Colinvaux
P.E. de Oliveira M.B. Bush |
Type de document : | Tiré à part |
Sujets : | CLIMATIC CHANGE ; PLEISTOCENE ; HOLOCENE Amazonie ; Glace ; Pollen |
Résumé : |
Plants respond to Pleistocene climatic change as species, not as associations or biomes. This has been demonstrated unequivocally by paleo botanical data for temperate latitudes. In the far richer vegetations of the tropics species populations also fluctuated independently in response to climatic forcing, from their longlasting glacial states to the patterns of brief interglacials like the present and back again. We use pollen data to reconstruct the vegetation of the Amazon basin in oxygen isotope stages 3 and 2 of the last glaciation in order to measure how the plant population of the Amazon responded to the global warming at the onset of the Holocene. We find that plant communities of the neotropics vent copious pollen to lake sediments and that this pollen yields powerful signals [...]
Plants respond to Pleistocene climatic change as species, not as associations or biomes. This has been demonstrated unequivocally by paleo botanical data for temperate latitudes. In the far richer vegetations of the tropics species populations also fluctuated independently in response to climatic forcing, from their longlasting glacial states to the patterns of brief interglacials like the present and back again. We use pollen data to reconstruct the vegetation of the Amazon basin in oxygen isotope stages 3 and 2 of the last glaciation in order to measure how the plant population of the Amazon responded to the global warming at the onset of the Holocene. We find that plant communities of the neotropics vent copious pollen to lake sediments and that this pollen yields powerful signals for community composition. Three continuous sdimentary records reaching through oxygen isotope stage 2 are available from the Amazon lowland, those from Carajas, Lake Pata and |
Editeur(s) : | Elsevier Science |
Date de publication : | 1999 |
Format : | pp. 141-169., ill., graph. tabl. nb réf. |
Langue(s) : | Anglais |
Lien vers la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=151454 |
Exemplaires (1)
Localisation | Emplacement | Pôle | Section | Cote | Support | Disponibilité |
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Kourou | AgroParisTech-Kourou | SI TP18520 | Papier | Empruntable Disponible |