Evolutionary history of two cryptic species of northern African jerboas
| Autor: | Nina Serén, Fernando Martínez-Freiría, Joana Paupério, Teresa Luísa Silva, Zbyszek Boratyński, José Carlos Brito, Tapio Mappes, Ana Filipa Moutinho, Rui Faria, Graciela Sotelo, Paulo C. Alves |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine reproductive isolation Speciation 01 natural sciences Gene flow Sahara-Sahel Jaculus jaculus Africa Northern Phylogeny sopeutuminen education.field_of_study cryptic diversity Deserts Ecology Reproductive isolation Biological Evolution phylogenetics aavikot Phylogenetics Phylogeography local adaptation ympäristönmuutokset Research Article Demographic history Species complex Evolution jyrsijät Genetic Speciation Cryptic diversity Local adaptation Population Rodentia Biology deserts Environment 010603 evolutionary biology DNA Mitochondrial African jerboas 03 medical and health sciences QH359-425 Animals education Ecology Evolution Behavior and Systematics Ecosystem Ecological niche Genetic diversity fylogenetiikka Genetic Variation 15. Life on land biology.organism_classification aavikkojerbot demographic history 030104 developmental biology speciation Haplotypes Evolutionary biology Jaculus lajiutuminen |
| Zdroj: | BMC Evolutionary Biology BMC Evolutionary Biology, Vol 20, Iss 1, Pp 1-16 (2020) |
| Popis: | Background: Climatic variation and geologic change both play significant roles in shaping species distributions, thus affecting their evolutionary history. In Sahara-Sahel, climatic oscillations shifted the desert extent during the Pliocene-Pleistocene interval, triggering the diversification of several species. Here, we investigated how these biogeographical and ecological events have shaped patterns of genetic diversity and divergence in African Jerboas, desert specialist rodents. We focused on two sister and cryptic species, Jaculus jaculus and J. hirtipes, where we (1) evaluated their genetic differentiation, (2) reconstructed their evolutionary and demographic history; (3) tested the level of gene flow between them, and (4) assessed their ecological niche divergence.Results: The analyses based on 231 individuals sampled throughout North Africa, 8 sequence fragments (one mitochondrial and seven single copy nuclear DNA, including two candidate genes for fur coloration: MC1R and Agouti), 6 microsatellite markers and ecological modelling revealed: (1) two distinct genetic lineages with overlapping distributions, in agreement with their classification as different species, J. jaculus and J. hirtipes, with (2) low levels of gene flow and strong species divergence, (3) high haplotypic diversity without evident geographic structure within species, and (4) a low level of large-scale ecological divergence between the two taxa, suggesting species micro-habitat specialization. Conclusions: Overall, our results suggest a speciation event that occurred during the Pliocene-Pleistocene transition. The contemporary distribution of genetic variation suggests ongoing population expansions. Despite the largely overlapping distributions at a macrogeographic scale, our genetic results suggest that the two species remain reproductively isolated, as only negligible levels of gene flow were observed. The overlapping ecological preferences at a macro-geographic scale and the ecological divergence at the micro-habitat scale suggest that local adaptation may have played a crucial role in the speciation process of these species. |
| Databáze: | OpenAIRE |
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