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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.    Electronic supplementary material  The online version of this article (doi:10.1186/s12862-015-0343-z) contains supplementary material, which is available to authorized users.

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