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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/13877

Title: Cryptic Species in Putative Ancient Asexual Darwinulids (Crustacea, Ostracoda)
Authors: Schon, Isa
Pinto, Ricardo L.
Halse, Stuart
Smith, Alison J.
Martens, Koen
Birky, C. William, Jr.
Issue Date: 2012
Publisher: PUBLIC LIBRARY SCIENCE
Citation: PLOS ONE, 7 (7)
Abstract: Background: Fully asexually reproducing taxa lack outcrossing. Hence, the classic Biological Species Concept cannot be applied. Methodology/Principal Findings: We used DNA sequences from the mitochondrial COI gene and the nuclear ITS2 region to check species boundaries according to the evolutionary genetic (EG) species concept in five morphospecies in the putative ancient asexual ostracod genera, Penthesilenula and Darwinula, from different continents. We applied two methods for detecting cryptic species, namely the K/h method and the General Mixed Yule Coalescent model (GMYC). We could confirm the existence of species in all five darwinulid morphospecies and additional cryptic diversity in three morphospecies, namely in Penthesilenula brasiliensis, Darwinula stevensoni and in P. aotearoa. The number of cryptic species within one morphospecies varied between seven (P. brasiliensis), five to six (D. stevensoni) and two (P. aotearoa), respectively, depending on the method used. Cryptic species mainly followed continental distributions. We also found evidence for coexistence at the local scale for Brazilian cryptic species of P. brasiliensis and P. aotearoa. Our ITS2 data confirmed that species exist in darwinulids but detected far less EG species, namely two to three cryptic species in P. brasiliensis and no cryptic species at all in the other darwinulid morphospecies. Conclusions/Significance: Our results clearly demonstrate that both species and cryptic diversity can be recognized in putative ancient asexual ostracods using the EG species concept, and that COI data are more suitable than ITS2 for this purpose. The discovery of up to eight cryptic species within a single morphospecies will significantly increase estimates of biodiversity in this asexual ostracod group. Which factors, other than long-term geographic isolation, are important for speciation processes in these ancient asexuals remains to be investigated.
Notes: [Schon, Isa; Martens, Koen] Royal Belgian Inst Nat Sci, Brussels, Belgium. [Schon, Isa] Univ Hasselt, Dept Biol, Diepenbeek, Belgium. [Pinto, Ricardo L.] Univ Brasilia, Inst Geosci, Brasilia, DF, Brazil. [Halse, Stuart] Bennelongia Pty Ltd, Wembley, WA, Australia. [Smith, Alison J.] Kent State Univ, Dept Geol, Kent, OH 44242 USA. [Martens, Koen] Univ Ghent, Dept Biol, B-9000 Ghent, Belgium. [Birky, C. William, Jr.] Univ Arizona, Dept Ecol & Evolutionary Biol, Tucson, AZ USA.
URI: http://hdl.handle.net/1942/13877
DOI: 10.1371/journal.pone.0039844
ISI #: 000306186900019
ISSN: 1932-6203
Category: A1
Type: Journal Contribution
Validation: ecoom, 2013
Appears in Collections: Environmental Biology
Research Institute: Centre for Environmental Sciences

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