| Texto completo | |
| Autor(es): |
Dantas-Queiroz, Marcos Vinicius
[1]
;
Cacossi, Tami da Costa
[2]
;
Leal, Barbara Simoes Santos
[2]
;
Chaves, Cleber Juliano Neves
[2]
;
Vasconcelos, Thais N. C.
[3]
;
Versieux, Leonardo de Melo
[4]
;
Palma-Silva, Clarisse
[2, 1]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Paulista UNESP, Programa Posgrad Biol Vegetal, BR-13506900 Rio Claro, SP - Brazil
[2] Univ Estadual Campinas UNICAMP, Inst Biol, Dept Biol Vegetal, Campinas, SP - Brazil
[3] Univ Arkansas, Dept Biol Sci, Fayetteville, AR 72701 - USA
[4] Univ Fed Rio Grande Norte UFRN, Dept Bot & Zool, Ctr Biociencias, Natal, RN - Brazil
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Biogeography; v. 48, n. 9, p. 2312-2327, SEP 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
Aim Ancient climatic fluctuations are invoked as the main driving force that generates the astonishing biodiversity in ancient mountains. As a result, endemism and spatial turnover are usually high and few species are widespread amongst entire mountain ranges, precluding the understanding of origins of macroevolutionary patterns. Here, we used a species endemic to, but widespread in, one of the most species-rich ancient mountains in the globe to test how environmental changes acted on and how their macroevolutionary patterns were shaped. Location Espinhaco Range, Eastern Brazil. Taxon Vriesea oligantha species complex (Bromeliaceae). Methods We compiled data for plastidial regions and nuclear microsatellites to assess genetic diversity, population structure, migration rates and phylogenetic relationships. Using temperature and precipitation variables, we modelled suitable areas for the present and the past, estimating corridors between isolated populations. We also implemented Bayesian demographic analyses to estimate ancient populations dynamics. Finally, we tested if population structure is driven by isolation by environment or by distance using a Bayesian modelling approach. Results Our results showed that the intraspecific divergence events of V. oligantha are older than those associated with the latest Pleistocene climatic oscillations, supporting the view that Quaternary climatic fluctuations are key components for understanding its population differentiation processes. Species distribution modelling estimated corridors between populations in the past, as also shown in the demographic analyses, depicting a major spatial reorganization during colder climates. Besides, the high genetic structure estimated results from both models of isolation by distance and by environment. Main conclusions V. oligantha is a remarkable model to test the effects of climatic oscillations over the biological community, since this species originated in the early-Pleistocene, prevailing over several cycles of climatic fluctuations until today. The estimated demographic dynamics of V. oligantha agrees with the species-pump mechanism, suggesting it as the main cause of speciation within the Espinhaco Range. Moreover, the phylogeographic patterns of V. oligantha reflect previously recognised spatial and temporal macroevolutionary patterns in the Espinhaco Range, providing insights into how microevolutionary processes may have given rise to this astonishing mountain biodiversity. (AU) | |
| Processo FAPESP: | 18/07596-0 - Filogeografia, genômica populacional e especiação de populações naturalmente fragmentadas de Bromeliaceae |
| Beneficiário: | Clarisse Palma da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa BIOTA - Regular |