Karyotypic diversification in Hypostomus Lacépède, 1803 (Siluriformes, Loricariidae): biogeographical and phylogenetic perspectives

Karyotypic diversification in Hypostomus Lacépède, 1803 (Siluriformes, Loricariidae):... Hypostomus is a species-rich genus of fish with unclear systematics and phylogenetic relationships. Ten species of Hypostomus (H. albopunctatus, H. ancistroides, H. cochliodon, H. commersoni, H. faveolus, H. hermanni, H. aff. paulinus, H. regani, H. strigaticeps and H. topavae) were cytogenetically analyzed through Giemsa staining and silver nitrate impregnation, and the obtained data were correlated to the available biogeographical and phylogenetic analyses for the genus. Although the silver stained nucleolar organizer regions (AgNORs) were found to vary significantly among the species, the diploid numbers could be correlated to the distribution of the species on northern and southern South America river basins. Species with the lower diploid numbers (2n = 64) were associated to northern hydrographic basins and showed a single AgNORs bearing pair. Diploid numbers of 66–68 chromosomes and of 70–84 chromosomes were correlated to two major clades within Hypostomus and southern hydrographic basins, and showed AgNORs varying on number and position. Our results show that cytogenetic data can be correlated to the phylogeny and biogeography of the genus, helping to clarify its complex evolutionary history. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Reviews in Fish Biology and Fisheries Springer Journals

Karyotypic diversification in Hypostomus Lacépède, 1803 (Siluriformes, Loricariidae): biogeographical and phylogenetic perspectives

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Publisher
Springer Netherlands
Copyright
Copyright © 2012 by Springer Science+Business Media B.V.
Subject
Life Sciences; Freshwater & Marine Ecology; Zoology
ISSN
0960-3166
eISSN
1573-5184
D.O.I.
10.1007/s11160-012-9280-8
Publisher site
See Article on Publisher Site

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