Artigo

Are amazonia rivers biogeographic barriers for lizards? A study on the geographic variation of the spectacled lizard Leposoma Osvaldoi Avila-Pires (Squamata, Gymnophthalmidae)

With improvements in taxonomic resolution in recent years, the Amazon basin is increasingly recognized as containing restricted-range taxa and areas of endemism. For many of these taxa, rivers delimit their geographic distributions and separate sister species. Among most lizards the geographic patte...

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Autor principal: Souza, Sergio Marques
Outros Autores: Rodrigues, Miguel Trefaut, Cohn-Haft, Mario
Grau: Artigo
Idioma: English
Publicado em: Journal of Herpetology 2020
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/17827
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spelling oai:repositorio:1-17827 Are amazonia rivers biogeographic barriers for lizards? A study on the geographic variation of the spectacled lizard Leposoma Osvaldoi Avila-Pires (Squamata, Gymnophthalmidae) Souza, Sergio Marques Rodrigues, Miguel Trefaut Cohn-Haft, Mario With improvements in taxonomic resolution in recent years, the Amazon basin is increasingly recognized as containing restricted-range taxa and areas of endemism. For many of these taxa, rivers delimit their geographic distributions and separate sister species. Among most lizards the geographic pattern is not clear. We attempt to determine the existence of cryptic diversity in the Spectacled Lizard Leposoma osvaldoi by analyzing the geographic variation in its morphology. We specifically tested whether the Rio Madeira, Rio Purus, Rio Aripuanã, and Rio Roosevelt delimit differentiated lizard forms. Using multivariate analysis, we detected that males of L. osvaldoi have larger heads than females but females have longer bodies. Large rivers, such as the Rio Purus and Rio Madeira, do not play a significant role in the geographic variation of L. osvaldoi. However, specimens from two localities on opposite banks of the upper Rio Aripuanã occupy the lower and upper ranges of variation in L. osvaldoi and are distinct from all other specimens analyzed. This unusual pattern differs from one of the main river hypothesis predictions, which is that similarity between individuals on opposite river banks should increase with decreasing barrier strength. We hypothesize that the differences in river dynamics between the lower and upper Rio Aripuanã during mid-Miocene through the Pleistocene could explain our results, although phylogeographic evidence is lacking to support such a hypothesis. The elucidation of recent and ancient processes that shaped diversity in Leposoma could provide important clues to understand the formation of the megadiversity of Amazonia. Copyright 2013 Society for the Study of Amphibians and Reptiles. 2020-06-15T21:49:30Z 2020-06-15T21:49:30Z 2013 Artigo https://repositorio.inpa.gov.br/handle/1/17827 10.1670/12-124 en Volume 47, Número 3, Pags. 511-519 Restrito Journal of Herpetology
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language English
description With improvements in taxonomic resolution in recent years, the Amazon basin is increasingly recognized as containing restricted-range taxa and areas of endemism. For many of these taxa, rivers delimit their geographic distributions and separate sister species. Among most lizards the geographic pattern is not clear. We attempt to determine the existence of cryptic diversity in the Spectacled Lizard Leposoma osvaldoi by analyzing the geographic variation in its morphology. We specifically tested whether the Rio Madeira, Rio Purus, Rio Aripuanã, and Rio Roosevelt delimit differentiated lizard forms. Using multivariate analysis, we detected that males of L. osvaldoi have larger heads than females but females have longer bodies. Large rivers, such as the Rio Purus and Rio Madeira, do not play a significant role in the geographic variation of L. osvaldoi. However, specimens from two localities on opposite banks of the upper Rio Aripuanã occupy the lower and upper ranges of variation in L. osvaldoi and are distinct from all other specimens analyzed. This unusual pattern differs from one of the main river hypothesis predictions, which is that similarity between individuals on opposite river banks should increase with decreasing barrier strength. We hypothesize that the differences in river dynamics between the lower and upper Rio Aripuanã during mid-Miocene through the Pleistocene could explain our results, although phylogeographic evidence is lacking to support such a hypothesis. The elucidation of recent and ancient processes that shaped diversity in Leposoma could provide important clues to understand the formation of the megadiversity of Amazonia. Copyright 2013 Society for the Study of Amphibians and Reptiles.
format Artigo
author Souza, Sergio Marques
spellingShingle Souza, Sergio Marques
Are amazonia rivers biogeographic barriers for lizards? A study on the geographic variation of the spectacled lizard Leposoma Osvaldoi Avila-Pires (Squamata, Gymnophthalmidae)
author2 Rodrigues, Miguel Trefaut
Cohn-Haft, Mario
author2Str Rodrigues, Miguel Trefaut
Cohn-Haft, Mario
title Are amazonia rivers biogeographic barriers for lizards? A study on the geographic variation of the spectacled lizard Leposoma Osvaldoi Avila-Pires (Squamata, Gymnophthalmidae)
title_short Are amazonia rivers biogeographic barriers for lizards? A study on the geographic variation of the spectacled lizard Leposoma Osvaldoi Avila-Pires (Squamata, Gymnophthalmidae)
title_full Are amazonia rivers biogeographic barriers for lizards? A study on the geographic variation of the spectacled lizard Leposoma Osvaldoi Avila-Pires (Squamata, Gymnophthalmidae)
title_fullStr Are amazonia rivers biogeographic barriers for lizards? A study on the geographic variation of the spectacled lizard Leposoma Osvaldoi Avila-Pires (Squamata, Gymnophthalmidae)
title_full_unstemmed Are amazonia rivers biogeographic barriers for lizards? A study on the geographic variation of the spectacled lizard Leposoma Osvaldoi Avila-Pires (Squamata, Gymnophthalmidae)
title_sort are amazonia rivers biogeographic barriers for lizards? a study on the geographic variation of the spectacled lizard leposoma osvaldoi avila-pires (squamata, gymnophthalmidae)
publisher Journal of Herpetology
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/17827
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score 11.755432

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