Landscape and climatic features drive genetic differentiation processes in a South American coastal plant.

Autor: Silva-Arias GA; Professorship for Population Genetics, Department of Life Science Systems, Technical University of Munich, Freising, Germany. gustavo.silva@tum.de.; Laboratory of Molecular Evolution, Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil. gustavo.silva@tum.de., Caballero-Villalobos L; Laboratory of Molecular Evolution, Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil., Giudicelli GC; Laboratory of Molecular Evolution, Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil., Freitas LB; Laboratory of Molecular Evolution, Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil. loreta.freitas@ufrgs.br.
Jazyk: angličtina
Zdroj: BMC ecology and evolution [BMC Ecol Evol] 2021 Oct 26; Vol. 21 (1), pp. 196. Date of Electronic Publication: 2021 Oct 26.
DOI: 10.1186/s12862-021-01916-4
Abstrakt: Background: Historical and ecological processes shape patterns of genetic diversity in plant species. Colonization to new environments and geographical landscape features determine, amongst other factors, genetic diversity within- and differentiation between-populations. We analyse the genetic diversity and population structure of Calibrachoa heterophylla to infer the influence of abiotic landscape features on the level of gene flow in this coastal species of the South Atlantic Coastal Plain.
Results: The C. heterophylla populations located on early-deposited coastal plain regions show higher genetic diversity than those closer to the sea. The genetic differentiation follows a pattern of isolation-by-distance. Landscape features, such as water bodies and wind corridors, and geographical distances equally explain the observed genetic differentiation, whereas the precipitation seasonality exhibits a strong signal for isolation-by-environment in marginal populations. The estimated levels of gene flow suggest that marginal populations had restricted immigration rates enhancing differentiation.
Conclusions: Topographical features related to coastal plain deposition history influence population differentiation in C. heterophylla. Gene flow is mainly restricted to nearby populations and facilitated by wind fields, albeit without any apparent influence of large water bodies. Furthermore, differential rainfall regimes in marginal populations seem to promote genetic differentiation.
(© 2021. The Author(s).)
Databáze: MEDLINE
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