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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Species distribution and introgressive hybridization of two Avicennia species from the Western Hemisphere unveiled by phylogeographic patterns

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Mori, Gustavo M. [1] ; Zucchi, Maria I. [2] ; Sampaio, Iracilda [3] ; Souza, Anete P. [4, 1]
Total Authors: 4
[1] Univ Estadual Campinas, Ctr Biol Mol & Engn Genet, BR-13083875 Campinas, SP - Brazil
[2] Polo Ctr Sul, Agencia Paulista Tecnol Agronegocios, BR-13400970 Piracicaba, SP - Brazil
[3] Fed Univ Para, Inst Estudos Costeiros, BR-68600000 Braganca, Para - Brazil
[4] Univ Estadual Campinas, Inst Biol, Dept Biol Vegetal, BR-13083862 Campinas, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: BMC Evolutionary Biology; v. 15, APR 10 2015.
Web of Science Citations: 11

Background: Mangrove plants grow in the intertidal zone in tropical and subtropical regions worldwide. The global latitudinal distribution of the mangrove is mainly influenced by climatic and oceanographic features. Because of current climate changes, poleward range expansions have been reported for the major biogeographic regions of mangrove forests in the Western and Eastern Hemispheres. There is evidence that mangrove forests also responded similarly after the last glaciation by expanding their ranges. In this context, the use of genetic tools is an informative approach for understanding how historical processes and factors impact the distribution of mangrove species. We investigated the phylogeographic patterns of two Avicennia species, A. germinans and A. schaueriana, from the Western Hemisphere using nuclear and chloroplast DNA markers. Results: Our results indicate that, although Avicennia bicolor, A. germinans and A. schaueriana are independent lineages, hybridization between A. schaueriana and A. germinans is a relevant evolutionary process. Our findings also reinforce the role of long-distance dispersal in widespread mangrove species such as A. germinans, for which we observed signs of transatlantic dispersal, a process that has, most likely, contributed to the breadth of the distribution of A. germinans. However, along the southern coast of South America, A. schaueriana is the only representative of the genus. The distribution patterns of A. germinans and A. schaueriana are explained by their different responses to past climate changes and by the unequal historical effectiveness of relative gene flow by propagules and pollen. Conclusions: We observed that A. bicolor, A. germinans and A. schaueriana are three evolutionary lineages that present historical and ongoing hybridization on the American continent. We also inferred a new evidence of transatlantic dispersal for A. germinans, which may have contributed to its widespread distribution. Despite the generally wider distribution of A. germinans, only A. schaueriana is found in southern South America, which may be explained by the different demographic histories of these two species and the larger proportion of gene flow produced by propagules rather than pollen in A. schaueriana. These results highlight that these species responded in different ways to past events, indicating that such differences may also occur in the currently changing world. (AU)

FAPESP's process: 13/08086-1 - Population and functional genomics and an ecophysiological approach on the evolutionary study of neotropical mangrove species in face of historical and current climate changes
Grantee:Gustavo Maruyama Mori
Support type: Scholarships in Brazil - Post-Doctorate