Speciation with gene flow via cycles of isolation and migration: insights from multiple mangrove taxa

He, Ziwen, Li, Xinnian, Yang, Ming, Wang, Xinfeng, Zhong, Cairong, Duke, Norman C., Shi, Suhua, and Wu, Chung-I (2019) Speciation with gene flow via cycles of isolation and migration: insights from multiple mangrove taxa. National Science Review, 6 (2). pp. 275-288.

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Abstract

Allopatric speciation requiring an unbroken period of geographical isolation has been the standard model of neo-Darwinism. While doubts have been repeatedly raised, strict allopatry without any gene flow remains a plausible mechanism in most cases. To rigorously reject strict allopatry, genomic sequences superimposed on the geological records of a well-delineated geographical barrier are necessary. The Strait of Malacca, narrowly connecting the Pacific and Indian Ocean coasts, serves at different times either as a geographical barrier or a conduit of gene flow for coastal/marine species. We surveyed 1,700 plants from 29 populations of five common mangrove species by large scale DNA sequencing and added several whole-genome assemblies. Speciation between the two oceans is driven by cycles of isolation and gene flow due to the fluctuations in sea level leading to the opening/closing of the Strait to ocean currents. Because the time required for speciation in mangroves is longer than the isolation phases, speciation in these mangroves has proceeded through many cycles of mixing-isolation-mixing, or MIM cycles. The MIM mechanism, by relaxing the condition of no gene flow, can promote speciation in many more geographical features than strict allopatry can. Finally, the MIM mechanism of speciation is also efficient, potentially yielding mn (m>1) species after n cycles.

Item ID: 56797
Item Type: Article (Research - C1)
ISSN: 2053-714X
Keywords: mangroves; speciation; allopatry; gene flow; geographic isolation
Copyright Information: © The Author(s) 2018. Published by Oxford University Press on behalf of China Science Publishing & Media Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0 /), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re -use, please contactjournals.permissions@oup.com
Date Deposited: 08 Jan 2019 23:44
FoR Codes: 41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410401 Conservation and biodiversity @ 30%
31 BIOLOGICAL SCIENCES > 3105 Genetics > 310599 Genetics not elsewhere classified @ 40%
31 BIOLOGICAL SCIENCES > 3104 Evolutionary biology > 310412 Speciation and extinction @ 30%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960802 Coastal and Estuarine Flora, Fauna and Biodiversity @ 50%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales @ 50%
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