02193nas a2200253   4500008004100000245016700041210006900208300000800277490000800285520140300293653001301696653002001709653001801729653001801747653001901765100002501784700001901809700001201828700001301840700001501853700001301868700001401881856004401895       2009                        eng d00aGenetic variation in natural populations of Anthurium sinuatum and A. pentaphyllum var. pentaphyllum (Araceae) from north-east Brazil using AFLP molecular markers0 aGenetic variation in natural populations of Anthurium sinuatum a  a1550 v1593 a<p>Genetic variation was investigated using AFLP markers in 12 populations of Anthurium sinuatum and A. pentaphyllum var. pentaphyllum (Araceae) in north-east Brazil, Amazonia and the Brazilian Atlantic forest. Two unique genetic patterns characterized the populations of A. sinuatum as a group, but no correlation between genetic and geographical interpopulation distance was found; the Amazonian population was not separated from that in Cear&aacute;. The isolated Cear&aacute; brejo populations of A. sinuatum were genetically distinct, but genetic diversity levels were similar to populations elsewhere, with no evidence of genetic erosion. Anthurium pentaphyllum populations were significantly different from each other; Bayesian genetic structural analysis found no common genetic pattern, but revealed genetic clusters unique to subgroups and individual populations in the Atlantic forest and French Guiana. Anthurium pentaphyllum and A. sinuatum can be distinguished genetically, but individuals of both species formed intermediate genetic clusters that blurred their distinction. We suggest that genetic mixing of A. sinuatum and A. pentaphyllum has occurred in north-east Brazil, possibly connected with cycles of humid forest expansion. The weak genetic structure in A. sinuatum is consistent with the natural fragmentation of continuous forest areas, possibly during the Holocene.</p>
10aAmazonia10aAtlantic forest10abrejo forests10aFrench Guiana10aspecies limits1 aAndrade, Ivanilza, M1 aMayo, Simon, J1 aBerg, C1 aFay, M F1 aChester, M1 aLexer, C1 aKirkup, D  uhttps://bionoset.myspecies.info/node/1002695nas a2200193   4500008004100000245017200041210006900213300000900282490000800291520204800299100002502347700001902372700001202391700001302403700001502416700001302431700001402444856004302458       2007                        eng d00aA Preliminary Study of Genetic Variation in Populations of Monstera adansonii var. klotzschiana (Araceae) from North-East Brazil, Estimated with AFLP Molecular Markers0 aPreliminary Study of Genetic Variation in Populations of Monster  a11540 v1003 a<p>&dagger; Background and Aims This study sought genetic evidence of long-term isolation in populations of Monstera adansonii var. klotzschiana (Araceae), a herbaceous, probably outbreeding, humid forest hemi-epiphyte, in the brejo forests of Ceara&acute; (north-east Brazil), and clarification of their relationships with populations in Amazonia and the Atlantic forest of Brazil. &dagger; Methods Within-population genetic diversity and between-population dissimilarity were estimated using AFLP molecular markers in 75 individuals from eight populations located in Ceara&acute;, the Brazilian Atlantic Forest and Amazonia. &dagger; Key Results The populations showed a clinal pattern of weak genetic differentiation over a large geographical region (FST &frac14; 0.1896). A strong correlation between genetic and geographical distance (Mantel test: r &frac14; 0.6903, P &frac14; 0.002) suggests a historical pattern of isolation by distance. Genetic structure analysis revealed at least two distinct gene pools in the data. The two isolated Ceara&acute; populations are significantly different from each other ( pairwise FPT &frac14; 0.137, P &frac14; 0.003) and as diverse (Nei&rsquo;s gene diversity, average He &frac14; 0.1832, 0.1706) as those in the Atlantic and Amazon forest regions. The population in southern Brazil is less diverse (Nei&rsquo;s gene diversity, average He &frac14; 0.127) than the rest. The Ceara&acute; populations are related to those of the Atlantic forest rather than those from Amazonia (AMOVA, among-groups variation &frac14; 11.95 %, P &frac14; 0.037). &dagger;Conclusions The gene pools detected within an overall pattern of clinal variation suggest distinct episodes of gene flow, possibly correlated with past humid forest expansions. The Ceara&acute; populations show no evidence of erosion of genetic diversity, although this was expected because of their isolation. Their genetic differentiation and relatively high diversity reinforce the importance of conserving the endangered brejo forests..</p>
1 aAndrade, Ivanilza, M1 aMayo, Simon, J1 aBerg, C1 aFay, M F1 aChester, M1 aLexer, C1 aKirkup, D  uhttps://bionoset.myspecies.info/node/8