hylogenomics, introgression, and demographic history of South American true toads (Rhinella

Autor(es)

Rivera, Danielle ^{[1, 2]} ; Prates, Ivan ^{[3, 4]} ; Firneno, Jr., Thomas J. ^{[1, 2]} ; Rodrigues, Miguel Trefaut ^[5] ; Caldwell, Janalee P. ^{[6, 7]} ; Fujita, Matthew K. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Texas Arlington, Dept Biol, Arlington, TX 76019 - USA

^[2] Univ Texas Arlington, Amphibian & Reptile Divers Res Ctr, Arlington, TX - USA

^[3] Univ Michigan, Museum Zool, Ann Arbor, MI 48109 - USA

^[4] Univ Michigan, Dept Ecol & Evolutionary Biol, Ann Arbor, MI - USA

^[5] Univ Sao Paulo, Inst Biociencias, Dept Zool, Sao Paulo, SP - Brazil

^[6] Univ Oklahoma, Sam Noble Museum, Norman, OK - USA

^[7] Univ Oklahoma, Dept Biol, Norman, OK - USA

• Tipo de documento: Artigo Científico
• Fonte: Molecular Ecology; v. 31, n. 3 DEC 2021.
• Citações Web of Science: 0

Resumo

The effects of genetic introgression on species boundaries and how they affect species' integrity and persistence over evolutionary time have received increased attention. The increasing availability of genomic data has revealed contrasting patterns of gene flow across genomic regions, which impose challenges to inferences of evolutionary relationships and of patterns of genetic admixture across lineages. By characterizing patterns of variation across thousands of genomic loci in a widespread complex of true toads (Rhinella), we assess the true extent of genetic introgression across species thought to hybridize to extreme degrees based on natural history observations and multilocus analyses. Comprehensive geographic sampling of five large-ranged Neotropical taxa revealed multiple distinct evolutionary lineages that span large geographic areas and, at times, distinct biomes. The inferred major clades and genetic clusters largely correspond to currently recognized taxa; however, we also found evidence of cryptic diversity within taxa. While previous phylogenetic studies revealed extensive mitonuclear discordance, our genetic clustering analyses uncovered several admixed individuals within major genetic groups. Accordingly, historical demographic analyses supported that the evolutionary history of these toads involved cross-taxon gene flow both at ancient and recent times. Lastly, ABBA-BABA tests revealed widespread allele sharing across species boundaries, a pattern that can be confidently attributed to genetic introgression as opposed to incomplete lineage sorting. These results confirm previous assertions that the evolutionary history of Rhinella was characterized by various levels of hybridization even across environmentally heterogeneous regions, posing exciting questions about what factors prevent complete fusion of diverging yet highly interdependent evolutionary lineages. (AU)

• Processo FAPESP: 13/50297-0 - Dimensions US-BIOTA São Paulo: integrando disciplinas para a predição da biodiversidade da Floresta Atlântica no Brasil
• Beneficiário: Cristina Yumi Miyaki
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 12/15754-8 - Consequências ecogeográficas da evolução do morfotipo serpentiforme em Squamata
• Beneficiário: Agustín Camacho Guerrero
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 03/10335-8 - Sistemática e evolução da herpetofauna neotropical
• Beneficiário: Miguel Trefaut Urbano Rodrigues
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/08357-6 - Padrões de Endemismo Filogenético e Filogeografia Comparada da Herpetofauna da Amazônia Brasileira
• Beneficiário: Sérgio Marques de Souza
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 11/50206-9 - Origem e evolução das serpentes e a sua diversificação na região neotropical: uma abordagem multidisciplinar
• Beneficiário: Hussam El Dine Zaher
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 11/50146-6 - Filogeografia comparada, filogenia, modelagem paleoclimática e taxonomia de répteis e anfíbios neotropicais
• Beneficiário: Miguel Trefaut Urbano Rodrigues
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático