Niche modelling and landscape genetics of Caryocar brasiliense (“Pequi” tree: Caryocaraceae) in brazilian Cerrado: an integrative approach for evaluating central–peripheral population patterns
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2009
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Resumo
Complex and integrative approaches may be
necessary to understand the abundant-centre model and
the patterns in genetic diversity that may be explained by
this model. Here we developed an integrated framework to
study spatial patterns in genetic diversity within local
populations, coupling genetic data, niche modelling and
landscape genetics, and applied this framework to evaluate
population structure of Caryocar brasiliense, an endemic
tree from the Brazilian Cerrado. We showed different
geographical patterns for genetic diversity, allelic richness
and inbreeding levels, estimated using microsatellite data
for ten local populations. Ecological suitability was
estimating by combining five niche modelling techniques.
Genetic diversity tend to follow a central-periphery model
and is associated with ecological variables. On the other
hand, inbreeding levels may be alternatively explained by
isolation processes and habitat fragmentation more related
to intense recent human occupation in the southern border
of the biome, or by deeper historical patterns in the origin
of the populations. Although still suffering from some of
the problems of central-periphery analysis (small number of
local populations), our analyses show how these patterns can be better investigated and offering a better understanding
of the processes structuring genetic diversity within
species’ geographic ranges.
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Genetic diversity, Human impacts, Population structure, Inbreeding, Niche modelling, Landscape genetics
Citação
DINIZ-FILHO, José Alexandre F. et al. Niche modelling and landscape genetics of Caryocar brasiliensis (Pequi tree: Caryocaraceae) in brazilian Cerrado: an integrative approach for evaluating central-peripheral population patterns. Tree Genetics & Genomes, Heidelberg, v. 5, p. 617-627, 2009.