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Barbosa S, Andrews KR, Goldberg AR, Gour DS, Hohenlohe PA, Conway CJ, Waits LP. The role of neutral and adaptive genomic variation in population diversification and speciation in two ground squirrel species of conservation concern. Mol Ecol 2021; 30:4673-4694. [PMID: 34324748 DOI: 10.1111/mec.16096] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 07/10/2021] [Accepted: 07/19/2021] [Indexed: 11/29/2022]
Abstract
Understanding the neutral (demographic) and adaptive processes leading to the differentiation of species and populations is a critical component of evolutionary and conservation biology. In this context, recently diverged taxa represent a unique opportunity to study the process of genetic differentiation. Northern and southern Idaho ground squirrels (Urocitellus brunneus - NIDGS, and U. endemicus - SIDGS, respectively) are a recently diverged pair of sister species that have undergone dramatic declines in the last 50 years and are currently found in metapopulations across restricted spatial areas with distinct environmental pressures. Here we genotyped single-nucleotide polymorphisms (SNPs) from buccal swabs with restriction site-associated DNA sequencing (RADseq). With these data we evaluated neutral genetic structure at both theinter- and intraspecific level, and identified putatively adaptive SNPs using population structure outlier detection and genotype-environment association (GEA) analyses. At the interspecific level, we detected a clear separation between NIDGS and SIDGS, and evidence for adaptive differentiation putatively linked to torpor patterns. At the intraspecific level, we found evidence of both neutral and adaptive differentiation. For NIDGS, elevation appears to be the main driver of adaptive differentiation, while neutral variation patterns match and expand information on the low connectivity between some populations identified in previous studies using microsatellite markers. For SIDGS, neutral substructure generally reflected natural geographic barriers, while adaptive variation reflected differences in land cover and temperature, as well as elevation. These results clearly highlight the roles of neutral and adaptive processes for understanding the complexity of the processes leading to species and population differentiation, which can have important conservation implications in susceptible and threatened species.
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Affiliation(s)
- Soraia Barbosa
- Department of Fish and Wildlife Sciences, College of Natural Resources, University of Idaho, 875 Perimeter Drive, Moscow, ID, 83844-1136, USA
| | - Kimberly R Andrews
- University of Idaho, Institute for Bioinformatics and Evolutionary Studies (IBEST), Moscow, ID, 83844-1136, USA
| | - Amanda R Goldberg
- Department of Fish and Wildlife Sciences, College of Natural Resources, University of Idaho, 875 Perimeter Drive, Moscow, ID, 83844-1136, USA
| | - Digpal S Gour
- Department of Fish and Wildlife Sciences, College of Natural Resources, University of Idaho, 875 Perimeter Drive, Moscow, ID, 83844-1136, USA
| | - Paul A Hohenlohe
- University of Idaho, Institute for Bioinformatics and Evolutionary Studies (IBEST), Moscow, ID, 83844-1136, USA.,Department of Biological Sciences, College of Science, University of Idaho, 875 Perimeter Drive, Moscow, ID, 83844-3051, USA
| | - Courtney J Conway
- U.S. Geological Survey, Idaho Cooperative Fish & Wildlife Research Unit, Department of Fish and Wildlife Sciences, College of Natural Resources, University of Idaho, Moscow, ID, 83844-1141, USA
| | - Lisette P Waits
- Department of Fish and Wildlife Sciences, College of Natural Resources, University of Idaho, 875 Perimeter Drive, Moscow, ID, 83844-1136, USA
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Horníková M, Marková S, Lanier HC, Searle JB, Kotlík P. A dynamic history of admixture from Mediterranean and Carpathian glacial refugia drives genomic diversity in the bank vole. Ecol Evol 2021; 11:8215-8225. [PMID: 34188881 PMCID: PMC8216894 DOI: 10.1002/ece3.7652] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 04/22/2021] [Indexed: 01/26/2023] Open
Abstract
Understanding the historical contributions of differing glacial refugia is key to evaluating the roles of microevolutionary forces, such as isolation, introgression, and selection in shaping genomic diversity in present-day populations. In Europe, where both Mediterranean and extra-Mediterranean (e.g., Carpathian) refugia of the bank vole (Clethrionomys glareolus) have been identified, mtDNA indicates that extra-Mediterranean refugia were the main source of colonization across the species range, while Mediterranean peninsulas harbor isolated, endemic lineages. Here, we critically evaluate this hypothesis using previously generated genomic data (>6,000 SNPs) for over 800 voles, focusing on genomic contributions to bank voles in central Europe, a key geographic area in considering range-wide colonization. The results provide clear evidence that both extra-Mediterranean (Carpathian) and Mediterranean (Spanish, Calabrian, and Balkan) refugia contributed to the ancestry and genomic diversity of bank vole populations across Europe. Few strong barriers to dispersal and frequent admixture events in central Europe have led to a prominent mid-latitude peak in genomic diversity. Although the genomic contribution of the centrally located Carpathian refugium predominates, populations in different parts of Europe have admixed origins from Mediterranean (28%-47%) and the Carpathian (53%-72%) sources. We suggest that the admixture from Mediterranean refugia may have provisioned adaptive southern alleles to more northern populations, facilitating the end-glacial spread of the admixed populations and contributing to increased bank vole diversity in central Europe. This study adds critical details to the complex end-glacial colonization history of this well-studied organism and underscores the importance of genomic data in phylogeographic interpretation.
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Affiliation(s)
- Michaela Horníková
- Laboratory of Molecular Ecology Institute of Animal Physiology and Genetics of the Czech Academy of Sciences Liběchov Czech Republic
- Department of Zoology, Faculty of Science Charles University Prague Czech Republic
| | - Silvia Marková
- Laboratory of Molecular Ecology Institute of Animal Physiology and Genetics of the Czech Academy of Sciences Liběchov Czech Republic
| | - Hayley C Lanier
- Department of Biology, Program in Ecology & Evolutionary Biology University of Oklahoma Norman OK USA
- Sam Noble Museum University of Oklahoma Norman OK USA
| | - Jeremy B Searle
- Department of Ecology and Evolutionary Biology Cornell University Ithaca NY USA
| | - Petr Kotlík
- Laboratory of Molecular Ecology Institute of Animal Physiology and Genetics of the Czech Academy of Sciences Liběchov Czech Republic
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Lamelas L, Aleix-Mata G, Rovatsos M, Marchal JA, Palomeque T, Lorite P, Sánchez A. Complete Mitochondrial Genome of Three Species of the Genus Microtus (Arvicolinae, Rodentia). Animals (Basel) 2020; 10:E2130. [PMID: 33207831 PMCID: PMC7696944 DOI: 10.3390/ani10112130] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 11/09/2020] [Accepted: 11/14/2020] [Indexed: 11/17/2022] Open
Abstract
The 65 species of the genus Microtus have unusual sex-related genetic features and a high rate of karyotype variation. However, only nine complete mitogenomes for these species are currently available. We describe the complete mitogenome sequences of three Microtus, which vary in length from 16,295 bp to 16,331 bp, contain 13 protein-coding genes (PCGs), two ribosomal RNA genes, 22 transfer RNA genes and a control region. The length of the 13 PCGs and the coded proteins is the same in all three species, and the start and stop codons are conserved. The non-coding regions include the L-strand origin of replication, with the same sequence of 35 bp, and the control region, which varies between 896 bp and 930 bp in length. The control region includes three domains (Domains I, II and III) with extended termination-associated sequences (ETAS-1 and ETAS-2) in Domain I. Domain II and Domain III include five (CSB-B, C, D, E and F) and three (CSB-1, CSB-2, and CSB-3) conserved sequence blocks, respectively. Phylogenetic reconstructions using the mitochondrial genomes of all the available Microtus species and one representative species from another genus of the Arvicolinae subfamily reproduced the established phylogenetic relationships for all the Arvicolinae genera that were analyzed.
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Affiliation(s)
- Luz Lamelas
- Departamento de Biología Experimental, Área de Genética, Universidad de Jaén, Paraje de las Lagunillas s/n, 23071 Jaén, Spain; (L.L.); (G.A.-M.); (J.A.M.); (T.P.); (P.L.)
| | - Gaël Aleix-Mata
- Departamento de Biología Experimental, Área de Genética, Universidad de Jaén, Paraje de las Lagunillas s/n, 23071 Jaén, Spain; (L.L.); (G.A.-M.); (J.A.M.); (T.P.); (P.L.)
| | - Michail Rovatsos
- Department of Ecology, Faculty of Science, Charles University, 12844 Prague, Czech Republic;
| | - Juan Alberto Marchal
- Departamento de Biología Experimental, Área de Genética, Universidad de Jaén, Paraje de las Lagunillas s/n, 23071 Jaén, Spain; (L.L.); (G.A.-M.); (J.A.M.); (T.P.); (P.L.)
| | - Teresa Palomeque
- Departamento de Biología Experimental, Área de Genética, Universidad de Jaén, Paraje de las Lagunillas s/n, 23071 Jaén, Spain; (L.L.); (G.A.-M.); (J.A.M.); (T.P.); (P.L.)
| | - Pedro Lorite
- Departamento de Biología Experimental, Área de Genética, Universidad de Jaén, Paraje de las Lagunillas s/n, 23071 Jaén, Spain; (L.L.); (G.A.-M.); (J.A.M.); (T.P.); (P.L.)
| | - Antonio Sánchez
- Departamento de Biología Experimental, Área de Genética, Universidad de Jaén, Paraje de las Lagunillas s/n, 23071 Jaén, Spain; (L.L.); (G.A.-M.); (J.A.M.); (T.P.); (P.L.)
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Wolf JF, Kriss KD, MacAulay KM, Shafer ABA. Panmictic population genetic structure of northern British Columbia mountain goats (Oreamnos americanus) has implications for harvest management. CONSERV GENET 2020. [DOI: 10.1007/s10592-020-01274-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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