caa a22 4500 445844930 CHVBK 20180317145355.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s10709-011-9618-5 doi (NATIONALLICENCE)springer-10.1007/s10709-011-9618-5 Diversity and genetic connectivity among populations of a threatened tree ( Dalbergia nigra ) in a recently fragmented landscape of the Brazilian Atlantic Forest [Elektronische Daten] [Luciana Resende, Renata Ribeiro, Maria Lovato] In this study we evaluated the influence of recent landscape fragmentation on the dynamics of remnant fragments from the Brazilian Atlantic Forest. This biome is one of the richest in the world and has been extensively deforested and fragmented. We sampled five populations of the threatened Dalbergia nigra, a tree endemic to the Brazilian Atlantic Forest, two located in a large reserve of continuous forest and three in fragments of different sizes and levels of disturbance. In order to assess historical changes, considering the longevity of the analyzed species, 119 adults and 116 saplings were genotyped for six microsatellite loci. Lower levels of genetic diversity were found in the most impacted fragments when compared to the most preserved population located inside the reserve, and there was significant genetic structure among the populations studied (pairwise F ST=0.031-0.152; pairwise D EST=0.039-0.301). However, genetic structure among saplings (F ST=0.056; D EST=0.231) was significantly lower than among adults (F ST=0.088; D EST=0.275). Estimates of contemporary gene flow based on assignment tests corroborated this result, suggesting that fragmentation led to an increase in gene flow. This connectivity among remnant fragments could mitigate the loss of genetic diversity through a metapopulation dynamic, but the high rate of habitat loss and the unknown long-term genetic effects add uncertainty. These results, taken together with the presence of private alleles in disturbed populations, highlight the importance of preserving the extant fragments. Springer Science+Business Media B.V., 2011 Brazilian Atlantic Forest nationallicence Gene flow nationallicence Genetic diversity nationallicence Landscape fragmentation nationallicence Metapopulation nationallicence Microsatellite nationallicence Resende Luciana Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, CP 486, CEP 31270-901, Belo Horizonte, MG, Brazil aut Ribeiro Renata Departamento de Ciências Biológicas, Faculdade de Ciências Biológicas e da Saúde, Universidade Federal dos Vales do Jequitinhonha e Mucuri, CEP 39100-000, Diamantina, MG, Brazil aut Lovato Maria Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, CP 486, CEP 31270-901, Belo Horizonte, MG, Brazil aut Genetica Springer Netherlands 139/9(2011-09-01), 1159-1168 0016-6707 139:9<1159 2011 139 10709 https://doi.org/10.1007/s10709-011-9618-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10709-011-9618-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Resende Luciana Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, CP 486, CEP 31270-901, Belo Horizonte, MG, Brazil aut NATIONALLICENCE 700 1- Ribeiro Renata Departamento de Ciências Biológicas, Faculdade de Ciências Biológicas e da Saúde, Universidade Federal dos Vales do Jequitinhonha e Mucuri, CEP 39100-000, Diamantina, MG, Brazil aut NATIONALLICENCE 700 1- Lovato Maria Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, CP 486, CEP 31270-901, Belo Horizonte, MG, Brazil aut NATIONALLICENCE 773 0- Genetica Springer Netherlands 139/9(2011-09-01), 1159-1168 0016-6707 139:9<1159 2011 139 10709 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer