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Glassfrogs (Anura: Centrolenidae) of Kaieteur National Park, Guyana, with notes on the distribution and taxonomy of some species of the family in the Guiana Shield
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Evolutionary Biology.
2008 (English)In: Zootaxa, ISSN 1175-5326, no 1680, 25-53 p.Article in journal (Refereed) Published
Abstract [en]

We provide new distribution records and discuss the taxonomy of three species of Glassfrogs from the Guiana Shield: Centrolene gorzulai, Cochranella helenae, and Hyalinobatrachium taylori. These three species were collected in Kaieteur National Park in west-central Guyana. Taxonomic changes were based on morphological, bioacoustic and genetic ( a fragment of the mitochondrial ribosomal gene 16S) comparisons. We consider Centrolene papillahallicum to be a junior synonym of C. gorzulai. We assign the Venezuelan population of Cochranella oyampiensis to Co. helenae and describe the phenotypic variation of this taxon. We refine the description of Cochranella oyampiensis and transfer it to the Co. spinosa species group. We propose the new name Cochranella helenae Group for those species of Cochranella assigned to the former Co. oyampiensis Group. We report the first record of Cochranella midas for French Guiana, and the first record of Hyalinobatrachium nouraguense, new emendation, for Suriname.

Place, publisher, year, edition, pages
2008. no 1680, 25-53 p.
Keyword [en]
Centrolenid frogs, Centrolene gorzulai, Centrolene papillahallicum, Cochranella ametarsia, Cochranella helenae, Cochranella midas, Cochranella oyampiensis, French Guiana, Hyalinobatrachium mondolfii, Hyalinobatrachium ouraguense, Hyalinobatrachium taylori, mitochondrial DNA, Suriname
National Category
Biological Sciences
URN: urn:nbn:se:uu:diva-100917ISI: 000252281700002OAI: oai:DiVA.org:uu-100917DiVA: diva2:211269
Available from: 2009-04-13 Created: 2009-04-13 Last updated: 2010-01-15Bibliographically approved
In thesis
1. Species Limits, and Evolutionary History of Glassfrogs
Open this publication in new window or tab >>Species Limits, and Evolutionary History of Glassfrogs
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Recognizing the mechanisms of speciation and the limits of species is essential to understand the origin of biodiversity and how to conserve it. The general aims of my investigations during my doctoral studies were two-fold: to study evolutionary patterns and processes, and to provide specific and superspecific taxonomic classifications that try to reflect evolutionary history. I have focused my research on anurans in their biodiversity hotspot, the American Tropics.

I have used morphological, behavioral (mating calls), and genetic (DNA sequences) characters to study species boundaries between frogs of the genus Pristimantis and the family Centrolenidae (glassfrogs). The results show that the exclusive use of single lines of evidence or the application of arbitrary thresholds impair and bias our ability to recognize new species and limit the possibility to understand evolutionary processes. Only an integrative approach combining every source of evidence provides the necessary feedback to discover all species and test their identity by comparing independent sets of data. This approach further allows identifying those species that probably represent stable comparative units (well supported species hypotheses) and to flag taxa that require further assessment.

Phylogenetic reconstructions based on seven nuclear and mitochondrial genes for about 100 species of glassfrogs revealed that previous hypotheses of relationships were mislead by rampant convergent evolution at the phenotypic level. None of the previously suggested classifications fit with the reconstructed evolutionary history. Consequently, we proposed a new classification consistent with this phylogeny.

I also studied the tempo and mode of diversification among glassfrogs. Based on sequences from ten genes in 87 species, I estimated species divergence times, age-range correlation between sister species, and reconstructed ancestral areas and dispersal/vicariance events. The results revealed a complex model of diversification where geographical isolation seems to be the dominant scenario for speciation and only clades of altitudinal generalists have been able to spread across the Neotropical rainforests.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 55 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 642
Amphibia, Anura, Biogeography, Centrolenidae, Diversification, Frogs, Molecular Phylogenetics, Neotropics, Pristimantis, Speciation, Species, Systematics, Taxonomy
National Category
Biological Systematics
Research subject
Systematic Zoology
urn:nbn:se:uu:diva-100923 (URN)978-91-554-7515-4 (ISBN)
Public defence
2009-05-26, Zootissalen, EBC, Villavägen 9, Uppsala, 09:00 (English)
Available from: 2009-05-05 Created: 2009-04-13 Last updated: 2009-05-28Bibliographically approved

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