Disentangling landscape effects on population genetic structure of a Neotropical savanna tree
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Data
2014
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Resumo
Geographical patterns of genetic variation and population structure and their relationship
with habitat loss and fragmentation have been investigated at distinct scales and extents
using spatially explicit statistics. Here, we analyzed population genetic structure of
Dipteryx alata (Fabaceae; the ª baruº tree), an economically important tree widely distributed
in Central Brazil that is endemic to the ª Cerradoº (savanna) biome, relating population
genetic divergence with broad-scale landscape patterns. Genetic divergence among 25
populations, estimated based on eight microsatellite loci for a total of 644 individuals, was
correlated with landscape features using several forms of Mantel tests (standard Mantel
correlations, Mantel correlograms, partial correlations, and multiple regression). Patterns
of genetic divergence are significantly correlated with human-driven landscape features
of habitat loss and fragmentation, after taking into account isolation-by-distance and
historical effects of range expansion after the last glacial maximum. Our findings present
important implications for the conservation of this species, because interruption of gene
flow by habitat loss and fragmentation jeopardize the persistence of population in the
medium- and long term due to disruption of demographic patterns, increased endogamy,
and recruitment problems.
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Palavras-chave
Baru tree, Cerrado, Correlogram, Landscape metrics, Mantel tests, Microsatellites
Citação
TELLES, Mariana Pires de Campos et al. Disentangling landscape effects on population genetic structure of a neotropical savanna tree. Natureza & Conservação, Curitiba, v. 12, n. 1, p. 65-70, 2014.