Data/hora: 13/06/2024 02:14:13

Provedor de dados: | 83
País: | Brazil
Título: | Systematics and biogeography of Sternarchellini (Gymnotiformes: Apteronotidae): Diversification of electric fishes in large Amazonian rivers
Autores: | Ivanyisky III,Stephen J.; Albert,James S.
Data: | 2014-09-01
Ano: | 2014
Palavras-chave: | Ecological specialization; Evolution; Historical Biogeography; Neotropical; Osteology.
Resumo: | The Sternarchellini (Gymnotiformes, Apteronotidae) is a clade of 10 electric fish species that inhabit deep river channels of the Amazon and Orinoco basins, attain moderate adult body sizes (15-50 cm TL), and have a predatory life style. Here we trace the evolutionary origin and diversification of Sternarchellini using standard phylogenetic and biogeographic procedures and a dataset of 70 morphological characters. The main results are: 1) the genus Sternarchellaincludes both species currently assigned to the genus Magosternarchus; and 2) neither of the multi-species assemblages of Sternarchellini in the Amazon and Orinoco basins are monophyletic. Historical biogeographic analysis suggests that sternarchelline evolution was linked to the large-scale river capture event that formed the modern Amazon and Orinoco basins, i.e. the Late Miocene rise of the Vaupes structural arch and concomitant breaching of the Purus structural arch. This event is hypothesized to have contributed to formation of the modern sternarchelline species, and to the formation of the modern basin-wide sternarchelline species assemblages. The results indicate that cladogenesis (speciation) and anagenesis (adaptive evolution) were decoupled processes in the evolution of Sternarchellini.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000300565
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/1982-0224-20130159
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.12 n.3 2014
Fonte: | info:eu-repo/semantics/openAccess