Matrix dominance and landscape resistance affect genetic variability and differentiation of an Atlantic Forest pioneer tree
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2022
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Context Despite the importance of secondary forests for the maintenance of biodiversity, the impact
of pioneer trees on habitat loss and fragmentation is
poorly understood.
Objectives We analyzed the efects of landscape
structure on genetic variability (node level analyses)
and genetic diferentiation (link level analyses) of
the pioneer tree Cecropia hololeuca in the Atlantic
Forest of southeastern Brazil. At the node level, we
analyzed the efects of landscape structure (forest and
pasture amount, compositional heterogeneity, number
and shape of patches, and matrix dominance), topography (slope and elevation), and efective population
size (Ne) on allelic richness (AR), genetic diversity
(He) and inbreeding coefcient (f). At the link level,
we analyzed the efect of four resistance surfaces (isolation by geographic distance, land cover, elevation, and slope) on genetic diferentiation between
populations (FST, G’ST, Jost’s D).
Methods We genotyped 257 individuals of C. hololeuca using eight microsatellite loci. At the node
level, we calculated landscape and topographic variables at six spatial scales. At the link level, we optimized the resistance surfaces using ResistanceGA.
We used a model selection approach to select the
most parsimonious models.
Results At the node level, matrices dominated by
pastures had higher AR than landscapes dominated
by Eucalyptus at the 1500 m spatial scale. At the link
level, FST was best explained by slope, with lower
values imposing more resistance. All resistance surfaces explained G’ST.
Conclusions In addition to conserving and restoring
habitats, management practices that improve matrix permeability should be adopted to favor the movement of dispersers, consequently improving natural
regeneration, increasing allelic richness, and decreasing genetic diferentiation of natural populations.
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Cecropia, Tropical forest, Connectivity, Pasture, Landscape genetics, Secondary forest
Citação
SANTOS, Juliana Silveira dos et al. Matrix dominance and landscape resistance affect genetic variability and differentiation of an Atlantic Forest pioneer tree. Landscape Ecology, Berlin, v. 37, p. 2481–2501, 2022. DOI: 10.1007/s10980-022-01498-6. Disponível em: https://link.springer.com/article/10.1007/s10980-022-01498-6. Acesso em: 29 ago. 2023.