Allochronic taxa as an alternative model to explain circumantarctic disjunctions
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
19/10/2012
19/10/2012
2009
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Resumo |
Most biogeographical studies propose that southern temperate faunal disjunctions are either the result of vicariance of taxa originated in Gondwana or the result of transoceanic dispersal of taxa originated after the breakup of Gondwana. The aim of this paper is to show that this is a false dichotomy. Antarctica retained a mild climate until mid-Cenozoic and had lasting connections, notably with southern South America and Australia. Both taxa originally Gondwanan and taxa secondarily on Gondwanan areas were subjected to tectonic-induced vicariance, and there is no need to invoke ad hoc transoceanic dispersal, even for post-Gondwanan taxa. These different elements with circumantarctic distributions are here called `allochronic taxa` - taxa presently occupying the same area, but whose presence in that area does not belong to the same time period. This model allows accommodation of conflicting sources of evidence now available for many groups with circumantarctic distributions. The fact that the species from both layers are mixed up in the current biodiversity implies the need to use additional sources of evidence - such as biogeographical, palaeontological, geological and molecular - to discriminate which are the original Gondwanan and which are post-Gondwanan elements in austral landmasses. |
Identificador |
SYSTEMATIC ENTOMOLOGY, v.34, n.1, p.2-9, 2009 0307-6970 http://producao.usp.br/handle/BDPI/20689 10.1111/j.1365-3113.2008.00448.x |
Idioma(s) |
eng |
Publicador |
WILEY-BLACKWELL PUBLISHING, INC |
Relação |
Systematic Entomology |
Direitos |
restrictedAccess Copyright WILEY-BLACKWELL PUBLISHING, INC |
Palavras-Chave | #LONG-DISTANCE DISPERSAL #SOUTHERN-HEMISPHERE #DIVERGENCE TIMES #GOODBYE GONDWANA #BIOGEOGRAPHY #DIVERSIFICATION #NOTHOFAGUS #PATTERNS #DIPTERA #ORIGIN #Evolutionary Biology #Entomology |
Tipo |
article original article publishedVersion |