High genetic diversity and contrasting fine-scale spatial genetic structure in four seasonally dry tropical forest tree species |
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Authors: | Rosane Garcia Collevatti Raquel Estolano Marina Lopes Ribeiro Suelen Gonçalves Rabelo Elizangela J Lima Cássia B R Munhoz |
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Institution: | 1. Laboratório de Genética & Biodiversidade, Instituto de Ciências Biológicas, Universidade Federal de Goiás, CP 131, Goiania, GO, 74001-970, Brazil 4. Departamento de Biologia Geral, Universidade Federal de Goiás, CP 131, Goiania, GO, 74001-970, Brazil 2. Programa de Pós-gradua??o em Ciências Gen?micas e Biotecnologia, Universidade Católica de Brasília, Brasília, DF, Brazil 3. Departamento de Botanica, Instituto de Ciências Biológicas, Universidade de Brasília, Brasília, DF, 70910-900, Brazil
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Abstract: | In this study we compared population structure, genetic diversity and fine-scale spatial genetic structure (SGS) in four Bignoniaceae tree species, Handroanthus chrysotrichus, H. impetiginosus, Tabebuia roseoalba and H. serratifolius in a remnant of seasonally dry tropical forest in Central-West Brazil, based on polymorphisms at six microsatellite loci. All species, except T. roseoalba, presented the inverted ‘J’ population structure indicating recruitment of juveniles. Juveniles presented a clumped distribution suggesting limitation in dispersal or patchy distribution of suitable microhabitat for recruitment. All species showed high levels of polymorphism and genetic diversity but without a clear pattern of distribution among life stages. The SGS was significant for all species, except T. roseoalba, but the pattern and strength of the spatial genetic structure differed among species. Handroanthus serratifolius had stronger SGS with significant kinship until 77 m. For H. impetiginosus and H. chrysotrichus, kinship was significant just until 23 and 6 m, respectively. Despite the high genetic diversity, all species showed low number of adults and high fixation indices suggesting that habitat fragmentation and disturbance have been affecting these populations in Central-West Brazil. |
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