Cargando…

SEXUAL SPECIES ARE SEPARATED BY LARGER GENETIC GAPS THAN ASEXUAL SPECIES IN ROTIFERS

Why organisms diversify into discrete species instead of showing a continuum of genotypic and phenotypic forms is an important yet rarely studied question in speciation biology. Does species discreteness come from adaptation to fill discrete niches or from interspecific gaps generated by reproductiv...

Descripción completa

Detalles Bibliográficos
Autores principales: Tang, Cuong Q, Obertegger, Ulrike, Fontaneto, Diego, Barraclough, Timothy G
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BlackWell Publishing Ltd 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4262011/
https://www.ncbi.nlm.nih.gov/pubmed/24975991
http://dx.doi.org/10.1111/evo.12483
_version_ 1782348370133647360
author Tang, Cuong Q
Obertegger, Ulrike
Fontaneto, Diego
Barraclough, Timothy G
author_facet Tang, Cuong Q
Obertegger, Ulrike
Fontaneto, Diego
Barraclough, Timothy G
author_sort Tang, Cuong Q
collection PubMed
description Why organisms diversify into discrete species instead of showing a continuum of genotypic and phenotypic forms is an important yet rarely studied question in speciation biology. Does species discreteness come from adaptation to fill discrete niches or from interspecific gaps generated by reproductive isolation? We investigate the importance of reproductive isolation by comparing genetic discreteness, in terms of intra- and interspecific variation, between facultatively sexual monogonont rotifers and obligately asexual bdelloid rotifers. We calculated the age (phylogenetic distance) and average pairwise genetic distance (raw distance) within and among evolutionarily significant units of diversity in six bdelloid clades and seven monogonont clades sampled for 4211 individuals in total. We find that monogonont species are more discrete than bdelloid species with respect to divergence between species but exhibit similar levels of intraspecific variation (species cohesiveness). This pattern arises because bdelloids have diversified into discrete genetic clusters at a faster net rate than monogononts. Although sampling biases or differences in ecology that are independent of sexuality might also affect these patterns, the results are consistent with the hypothesis that bdelloids diversified at a faster rate into less discrete species because their diversification does not depend on the evolution of reproductive isolation.
format Online
Article
Text
id pubmed-4262011
institution National Center for Biotechnology Information
language English
publishDate 2014
publisher BlackWell Publishing Ltd
record_format MEDLINE/PubMed
spelling pubmed-42620112014-12-15 SEXUAL SPECIES ARE SEPARATED BY LARGER GENETIC GAPS THAN ASEXUAL SPECIES IN ROTIFERS Tang, Cuong Q Obertegger, Ulrike Fontaneto, Diego Barraclough, Timothy G Evolution Original Articles Why organisms diversify into discrete species instead of showing a continuum of genotypic and phenotypic forms is an important yet rarely studied question in speciation biology. Does species discreteness come from adaptation to fill discrete niches or from interspecific gaps generated by reproductive isolation? We investigate the importance of reproductive isolation by comparing genetic discreteness, in terms of intra- and interspecific variation, between facultatively sexual monogonont rotifers and obligately asexual bdelloid rotifers. We calculated the age (phylogenetic distance) and average pairwise genetic distance (raw distance) within and among evolutionarily significant units of diversity in six bdelloid clades and seven monogonont clades sampled for 4211 individuals in total. We find that monogonont species are more discrete than bdelloid species with respect to divergence between species but exhibit similar levels of intraspecific variation (species cohesiveness). This pattern arises because bdelloids have diversified into discrete genetic clusters at a faster net rate than monogononts. Although sampling biases or differences in ecology that are independent of sexuality might also affect these patterns, the results are consistent with the hypothesis that bdelloids diversified at a faster rate into less discrete species because their diversification does not depend on the evolution of reproductive isolation. BlackWell Publishing Ltd 2014-10 2014-07-25 /pmc/articles/PMC4262011/ /pubmed/24975991 http://dx.doi.org/10.1111/evo.12483 Text en © 2014 The Authors. Evolution published by Wiley Periodicals, Inc. on behalf of The Society for the Study of Evolution. http://creativecommons.org/licenses/by/3.0/ This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Articles
Tang, Cuong Q
Obertegger, Ulrike
Fontaneto, Diego
Barraclough, Timothy G
SEXUAL SPECIES ARE SEPARATED BY LARGER GENETIC GAPS THAN ASEXUAL SPECIES IN ROTIFERS
title SEXUAL SPECIES ARE SEPARATED BY LARGER GENETIC GAPS THAN ASEXUAL SPECIES IN ROTIFERS
title_full SEXUAL SPECIES ARE SEPARATED BY LARGER GENETIC GAPS THAN ASEXUAL SPECIES IN ROTIFERS
title_fullStr SEXUAL SPECIES ARE SEPARATED BY LARGER GENETIC GAPS THAN ASEXUAL SPECIES IN ROTIFERS
title_full_unstemmed SEXUAL SPECIES ARE SEPARATED BY LARGER GENETIC GAPS THAN ASEXUAL SPECIES IN ROTIFERS
title_short SEXUAL SPECIES ARE SEPARATED BY LARGER GENETIC GAPS THAN ASEXUAL SPECIES IN ROTIFERS
title_sort sexual species are separated by larger genetic gaps than asexual species in rotifers
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4262011/
https://www.ncbi.nlm.nih.gov/pubmed/24975991
http://dx.doi.org/10.1111/evo.12483
work_keys_str_mv AT tangcuongq sexualspeciesareseparatedbylargergeneticgapsthanasexualspeciesinrotifers
AT oberteggerulrike sexualspeciesareseparatedbylargergeneticgapsthanasexualspeciesinrotifers
AT fontanetodiego sexualspeciesareseparatedbylargergeneticgapsthanasexualspeciesinrotifers
AT barracloughtimothyg sexualspeciesareseparatedbylargergeneticgapsthanasexualspeciesinrotifers