Species diversity in Gymnogeophagus (Teleostei: Cichlidae) and comparative biogeography of cichlids in the Middle Paraná basin, an emerging hotspot of fish endemism

We address the diversity of two species groups of the cichlid genus Gymnogeophagus in the Middle Parana basin using molecular phylogeography and traditional morphological characters and conclude that they are composed of a higher diversity of endemic species than previously thought. The nominal Gymn...

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Detalles Bibliográficos
Autores principales: Říčan, Oldřich, Říčanová, Štěpánka, Dragová, Klára, Piálek, Lubomír, Almirón, Adriana Edith, Casciotta, Jorge Rafael
Formato: Articulo
Lenguaje:Inglés
Publicado: 2019
Materias:
Ciencias Naturales
Freshwater fishes
Endemism
Putative new species
Phylogeography
Molecular-clock dating
Conservation
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/138485
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-138485
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Freshwater fishes
Endemism
Putative new species
Phylogeography
Molecular-clock dating
Conservation
spellingShingle Ciencias Naturales
Freshwater fishes
Endemism
Putative new species
Phylogeography
Molecular-clock dating
Conservation
Říčan, Oldřich
Říčanová, Štěpánka
Dragová, Klára
Piálek, Lubomír
Almirón, Adriana Edith
Casciotta, Jorge Rafael
Species diversity in Gymnogeophagus (Teleostei: Cichlidae) and comparative biogeography of cichlids in the Middle Paraná basin, an emerging hotspot of fish endemism
topic_facet Ciencias Naturales
Freshwater fishes
Endemism
Putative new species
Phylogeography
Molecular-clock dating
Conservation
description We address the diversity of two species groups of the cichlid genus Gymnogeophagus in the Middle Parana basin using molecular phylogeography and traditional morphological characters and conclude that they are composed of a higher diversity of endemic species than previously thought. The nominal Gymnogeophagus setequedas is found non-monophyletic with each phylogeographic lineage endemic to a single tributary of the Middle Parana (Rio Acaray, Rio Monday, the Itaipu area). Prime candidates for the origin of the species in the G. setequedas group are waterfalls that separate most of the tributaries from the Middle Parana River. The postulated waterfall- and rapids-driven fragmentation of Gymnogeophagus in the studied area falls into a narrow time window coinciding with the Pleistocene epoch. We further demonstrate that the endemism in Gymnogeophagus shows a high degree of biogeographical congruence with other sympatric cichlid genera. The Middle Parana basin has up to 27 globaly endemic species of cichlid fishes in three genera and 21 of these species are endemics of single tributaries of the Middle Parana. As a final consideration we address threats to the long term survival of the still poorly known but clearly highly endemic and endangered fish fauna of the Middle Parana basin.
format Articulo
Articulo
author Říčan, Oldřich
Říčanová, Štěpánka
Dragová, Klára
Piálek, Lubomír
Almirón, Adriana Edith
Casciotta, Jorge Rafael
author_facet Říčan, Oldřich
Říčanová, Štěpánka
Dragová, Klára
Piálek, Lubomír
Almirón, Adriana Edith
Casciotta, Jorge Rafael
author_sort Říčan, Oldřich
title Species diversity in Gymnogeophagus (Teleostei: Cichlidae) and comparative biogeography of cichlids in the Middle Paraná basin, an emerging hotspot of fish endemism
title_short Species diversity in Gymnogeophagus (Teleostei: Cichlidae) and comparative biogeography of cichlids in the Middle Paraná basin, an emerging hotspot of fish endemism
title_full Species diversity in Gymnogeophagus (Teleostei: Cichlidae) and comparative biogeography of cichlids in the Middle Paraná basin, an emerging hotspot of fish endemism
title_fullStr Species diversity in Gymnogeophagus (Teleostei: Cichlidae) and comparative biogeography of cichlids in the Middle Paraná basin, an emerging hotspot of fish endemism
title_full_unstemmed Species diversity in Gymnogeophagus (Teleostei: Cichlidae) and comparative biogeography of cichlids in the Middle Paraná basin, an emerging hotspot of fish endemism
title_sort species diversity in gymnogeophagus (teleostei: cichlidae) and comparative biogeography of cichlids in the middle paraná basin, an emerging hotspot of fish endemism
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/138485
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