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The Tertiary history of the northern temperate element in the northern Latin American biota

Graham, Alan

American journal of botany, 1999-01, Vol.86 (1), p.32-38 [Periódico revisado por pares]

United States: Botanical Soc America

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Título:
The Tertiary history of the northern temperate element in the northern Latin American biota
Autor: Graham, Alan
Assuntos: AIR TEMPERATURE ; AMERICA CENTRAL ; AMERIQUE CENTRALE ; ARBOLES FORESTALES ; ARBRE FORESTIER ; BANQUE DE DONNEES ; BASES DE DATOS ; BOTANICA ; Botanical gardens ; BOTANIQUE ; BOTANY ; CAMBIO CLIMATICO ; Cenozoic ; CENTRAL AMERICA ; CHANGEMENT CLIMATIQUE ; CLIMA TEMPLADO ; CLIMAT TEMPERE ; Climate ; CLIMATIC CHANGE ; CLIMATOLOGIA ; CLIMATOLOGIE ; CLIMATOLOGY ; COMMUNAUTE VEGETALE ; COMUNIDADES VEGETALES ; FLORA ; FLORE ; FOREST TREES ; Genera ; HISTOIRE ; HISTORIA ; HISTORY ; Latin America ; MEXICO ; MEXIQUE ; PALAEONTOLOGY ; Paleobotany ; Paleoclimatology ; PALEONTOLOGIA ; PALEONTOLOGIE ; PALINOLOGIA ; PALYNOLOGIE ; PALYNOLOGY ; PLANT COMMUNITIES ; Plants ; POLEN ; POLLEN ; South America ; TEMPERATE CLIMATE ; Temperate regions ; temperate vegetation ; TEMPERATE ZONES ; TEMPERATURA DEL AIRE ; TEMPERATURE DE L'AIR ; Tertiary ; TEXAS ; United States history ; VEGETACION ; VEGETATION ; ZONA TEMPLADA ; ZONE TEMPEREE
É parte de: American journal of botany, 1999-01, Vol.86 (1), p.32-38
Notas: F40
1999006802
K01
P40
The author thanks Henry Hooghiemstra for information on northern temperate elements in South America and Shirley A. Graham for reading the manuscript. Research supported by NSF grants, including NSF DEB‐9206743.
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Descrição: The time of origin of cool-to-cold-temperate plants of northern affinities in the Latin American biota is unsettled. Two models have been proposed-a Paleogene origin from a once widespread temperate rain forest, and a Neogene origin by introductions from the north which is best supported by new evidence. Fourteen palynofloras of Tertiary age are now available from Mexico and Central America, in addition to numerous others from the southeastern United States and northern South America. Pollen of cool-temperate plants occurs in the Eocene of southeastern United States, but not in northern Mexico, central Panama, or northern South America. In the Miocene this pollen is sparse in deposits from Mexico and Guatemala, rare in Panama, and absent from northern South America. In the Pliocene pollen representing a diverse northern temperate element of ten genera is present in the Pliocene of southeastern Veracruz, Mexico, five in northeastern Guatemala, and two (Myrica, Salix) first appear in northern South America; Alnus and Quercus are added in the Pleistocene. This north-to-south and early-to-late pattern is consistent with the appearance of highlands in southern Central America and northern South America in the Neogene, closure of the isthmian marine portal between 3.5 and 2.5 Ma (million years ago), and the late Cenozoic cooling trend evident in the18O/16O-based paleotemperature curve.
Editor: United States: Botanical Soc America
Idioma: Inglês

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The Tertiary history of the northern temperate element in the northern Latin American biota

Graham, Alan

United States: Botanical Soc America

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