From micro- to macroevolution: insights from a Neotropical bromeliad with high population genetic structure adapted to rock outcrops.

Heredity
Mateus Ribeiro MotaClarisse Palma-Silva

Abstract

Geographic isolation and reduced population sizes can lead to local extinction, low efficacy of selection and decreased speciation. However, population differentiation is an essential step of biological diversification. In allopatric speciation, geographically isolated populations differentiate and persist until the evolution of reproductive isolation and ecological divergence completes the speciation process. Pitcairnia flammea allows us to study the evolutionary consequences of habitat fragmentation on naturally disjoint rock-outcrop species from the Brazilian Atlantic Rainforest (BAF). Our main results showed low-to-moderate genetic diversity within populations, and deep population structuring caused by limited gene flow, low connectivity, genetic drift and inbreeding of long-term isolation and persistence of rock-outcrop populations throughout Quaternary climatic oscillations. Bayesian phylogenetic and model-based clustering analyses found no clear northern and southern phylogeographic structure commonly reported for many BAF organisms. Although we found two main lineages diverging by ~2 Mya during the early Pleistocene, species' delimitation analysis assigned most of the populations as independent evolving entities, sugges...Continue Reading

Associated Datasets

Aug 20, 2020·Mateus Ribeiro MotaClarisse Silva-Palma

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Methods Mentioned

BETA
gene exchange
genotyping

Software Mentioned

STRUCTURE
TRACER
GMYC
BAPS
- HARVESTER
GENEIOUS
LogCombiner
Network
Bayesian clustering analysis ( BAPS )
BEAST

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