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The evolution of reproductive isolation in Daphnia

BACKGROUND: The process by which populations evolve to become new species involves the emergence of various reproductive isolating barriers (RIB). Despite major advancements in understanding this complex process, very little is known about the order in which RIBs evolve or their relative contributio...

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Autores principales: Chin, Tiffany A., Cáceres, Carla E., Cristescu, Melania E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6880586/
https://www.ncbi.nlm.nih.gov/pubmed/31775606
http://dx.doi.org/10.1186/s12862-019-1542-9
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author Chin, Tiffany A.
Cáceres, Carla E.
Cristescu, Melania E.
author_facet Chin, Tiffany A.
Cáceres, Carla E.
Cristescu, Melania E.
author_sort Chin, Tiffany A.
collection PubMed
description BACKGROUND: The process by which populations evolve to become new species involves the emergence of various reproductive isolating barriers (RIB). Despite major advancements in understanding this complex process, very little is known about the order in which RIBs evolve or their relative contribution to the total restriction of gene flow during various stages of speciation. This is mainly due to the difficulties of studying reproductive isolation during the early stages of species formation. This study examines ecological and non-ecological RIB within and between Daphnia pulex and Daphnia pulicaria, two recently diverged species that inhabit distinct habitats and exhibit an unusual level of intraspecific genetic subdivision. RESULTS: We find that while ecological prezygotic barriers are close to completion, none of the non-ecological barriers can restrict gene flow between D. pulex and D. pulicaria completely when acting alone. Surprisingly, we also identified high levels of postzygotic reproductive isolation in ‘conspecific’ interpopulation crosses of D. pulex. CONCLUSIONS: While the ecological prezygotic barriers are prevalent during the mature stages of speciation, non-ecological barriers likely dominated the early stages of speciation. This finding indicates the importance of studying the very early stages of speciation and suggests the contribution of postzygotic isolation in initiating the process of speciation.
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spelling pubmed-68805862019-11-29 The evolution of reproductive isolation in Daphnia Chin, Tiffany A. Cáceres, Carla E. Cristescu, Melania E. BMC Evol Biol Research Article BACKGROUND: The process by which populations evolve to become new species involves the emergence of various reproductive isolating barriers (RIB). Despite major advancements in understanding this complex process, very little is known about the order in which RIBs evolve or their relative contribution to the total restriction of gene flow during various stages of speciation. This is mainly due to the difficulties of studying reproductive isolation during the early stages of species formation. This study examines ecological and non-ecological RIB within and between Daphnia pulex and Daphnia pulicaria, two recently diverged species that inhabit distinct habitats and exhibit an unusual level of intraspecific genetic subdivision. RESULTS: We find that while ecological prezygotic barriers are close to completion, none of the non-ecological barriers can restrict gene flow between D. pulex and D. pulicaria completely when acting alone. Surprisingly, we also identified high levels of postzygotic reproductive isolation in ‘conspecific’ interpopulation crosses of D. pulex. CONCLUSIONS: While the ecological prezygotic barriers are prevalent during the mature stages of speciation, non-ecological barriers likely dominated the early stages of speciation. This finding indicates the importance of studying the very early stages of speciation and suggests the contribution of postzygotic isolation in initiating the process of speciation. BioMed Central 2019-11-27 /pmc/articles/PMC6880586/ /pubmed/31775606 http://dx.doi.org/10.1186/s12862-019-1542-9 Text en © The Author(s). 2019 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research Article
Chin, Tiffany A.
Cáceres, Carla E.
Cristescu, Melania E.
The evolution of reproductive isolation in Daphnia
title The evolution of reproductive isolation in Daphnia
title_full The evolution of reproductive isolation in Daphnia
title_fullStr The evolution of reproductive isolation in Daphnia
title_full_unstemmed The evolution of reproductive isolation in Daphnia
title_short The evolution of reproductive isolation in Daphnia
title_sort evolution of reproductive isolation in daphnia
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6880586/
https://www.ncbi.nlm.nih.gov/pubmed/31775606
http://dx.doi.org/10.1186/s12862-019-1542-9
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