CONGRESO LXV CONGRESSO NACIONAL DE BOTÂNICA BOTÁNICA XXXIV ERBOT - Encontro Regional de Botânicos MG, BA, ES 18 A 24 DE OUTUBRO DE 2014 - SALVADOR - BAHIA - BRASIL Latinoamericano de Botânica na América Latina: conhecimento, interação e difusão PHYLOGEOGRAPHIC STUDY OF THE PANTROPICAL MANGROVE PLANT ACROSTICHUM AUREUM (PTERIDACEAE) AUTOR(ES):Takeru Yamakawa;Koji Takayama;Nazre Saleh;Yoshimi Shinmura;Alison Wee Kim Shan;Takeshi Asakawa;OrlexBaylen Yllano;SeverinoGarengoSalmo III;Erwin Riyanto Ardli;Nguyen Xuan Tung;NorhaslindaBinti Malekal;Onrizal;SankararamasubramanianHalasya;Meenakshisundaram;Sar awood Sungkaew;Bayu Adjie;KhinKhin Soe;Edward L. Webb;Shigeyuki Baba;Tadashi Kajita; INSTITUIÇÃO: Chiba University -The University of Tokyo -Universiti Putra Malaysia National University of Singapore -Adventist University of the Philippines Universiti Malaysia Sabah -Jenderal Soedirman University Hanoi National University of Education -Ateneo de Manila University Universitas Sumatera Utara -M.S. Swaminathan Research Foundation Kasetsart University -Bali Botanic Garden, Indonesia University of Yangon -University of Ryukyus Mangrove forest is a unique ecosystem distributed across tropical to subtropical coasts of the world. Although the range of mangrove distribution is pantropical, most of its component plant species exclusively distribute Either in IWP (Indo-West Pacific Ocean region) or AEP (Atlantic-East Pacific region) region. This bivalent pattern of distribution is not only common feature is mangrove plants but Also for other sea-dispersal plants, so that outside researchers thought que the African Continent and East Pacific region might have Prevented migration by sea-dispersal between IWP and AEP. This idea may consistent with the presence of an exception in mangrove plants, Acrostichum aureum L. mangrove fern This has pantropical distribution, Which May Be Caused by wind dispersal of its spores. However, two closely related specie, A. speciosum Willd. and A. danaefolium Langsd. & Fisch., Distribute only in IWP or AEP respectivamente, even though They also have wind dispersal of spores. To clarify how A. aureum Achieved pantropical distribution, and how the other two species do not, we Performed phylogeographic study. Collecting samples of the three species from 28 Populations of 16 countries world wide, we Studied nucleotide sequences of intergenic spacer region of an chloroplast DNA, trnW - trnP haplotype and its distribution over the distribution range. We used Ceratopteris thalictroides to an outgroup. Our Analyses detected four haplotypes, two of Them distributed only in IWP, one only in AEP and the other one in Both IWP and AEP. The presence of the same haplotype in Both IWP and AEP may Suggests the historical migration between the two regions. Phylogenetic tree and haplotype network Suggested the two haplotypes of the IWP Were derived ones, Which Suggests que the expansion of distribution might happen from AEP to IWP, Which may also suggest speciation might happen between A. danaefolium and A. aureum in AEP, then between A. aureum and A. CONGRESO LXV CONGRESSO NACIONAL DE BOTÂNICA BOTÁNICA XXXIV ERBOT - Encontro Regional de Botânicos MG, BA, ES 18 A 24 DE OUTUBRO DE 2014 - SALVADOR - BAHIA - BRASIL Latinoamericano de Botânica na América Latina: conhecimento, interação e difusão speciosum in IWP. The presence of common haplotypes among different species in Both IWP and AEP may suggest the cause of introgression or linage sorting. Although we used limited length of molecular marker, the results Suggested Clearly the haplotype distribute very wide range, but the others exclusively distribute only in ESL or the IWP like the other sea plants dispersal. Perhaps, wind dispersal of spores may historically Contribute to the formation of distribution range, but not to contemporary gene flow.