Genomic data from the Brazilian sibilator frog reveal contrasting pleistocene dynamics and regionalism in two South American dry biomes

Autor(es)

Thome, Maria Tereza C. ^{[1, 2, 3]} ; Carstens, Bryan C. ^[1] ; Rodrigues, Miguel T. ^[4] ; Alexandrino, Joao ^[5] ; Haddad, Celio F. B. ^{[2, 3]}

Afiliação do(s) autor(es)

^[1] Ohio State Univ, Dept Evolut Ecol & Organismal Biol, Columbus, OH 43210 - USA

^[2] Univ Estadual Paulista, Inst Biociencias, Dept Biodiversidade, Campus Rio Claro, Av 24A 1515, BR-13506900 Rio Claro, SP - Brazil

^[3] Univ Estadual Paulista, Inst Biociencias, Ctr Aquicultura, Campus Rio Claro, Av 24A 1515, BR-13506900 Rio Claro, SP - Brazil

^[4] Univ Sao Paulo, Inst Biociencias, Dept Zool, Sao Paulo, SP - Brazil

^[5] Univ Fed Sao Paulo, Dept Ecol & Biol Evolut, Inst Ciencias Ambientais Quim & Farmaceut, Diadema, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Biogeography; v. 48, n. 5 FEB 2021.
• Citações Web of Science: 0

Resumo

Aim: Knowledge about the Neotropical dry formations, particularly the Caatinga, remains rudimentary compared to other biotas in the region. Here we address several biogeographical hypotheses by combining intense geographical and genomic sampling obtained for the Brazilian sibilator frog. We specifically test predictions related to the putative roles of past climate shifts (Pleistocene and Holocene) and local geographical barriers (past and current courses of the Sao Francisco River, SFR) in causing population differentiation in this species. Location: Caatinga and eastern Cerrado. Taxon: Brazilian sibilator frog Leptodactylus troglodytes. Methods: We sequenced up to similar to 15,000 single nucleotide polymorphisms for 159 samples from 61 locations. We inferred genetic structure using spatial clustering and examined population sizes through time. We estimated the relationship among populations using phylogenetic reconstruction, estimated historical distributions with ecological niche modelling and inferred demographic history under isolation-with-migration models. Results: Genetic diversity in L. troglodytes corresponds to biome boundaries, with one population in the Cerrado and two populations in the Caatinga, separated by the SFR. Demographic model selection indicates the Caatinga populations expanded since the end of the Pleistocene while the Cerrado population declined. Within the Caatinga, population expansion began earlier and was more extreme in the north. A continuous stability area maintained the two Caatinga populations, which share a common origin and began diverging in the mid-Pleistocene, first with symmetric gene flow and later under pronounced migration from the north. Main conclusions: We could not reject a role of past climate change in causing diversification of relictual populations in the Cerrado, but we found no evidence of multiple refuges or long-term isolation within the Caatinga. Instead, diversification in this biome appears to be caused by the SFR acting as a `soft barrier' that constrains migration over an extended period of time. (AU)

• Processo FAPESP: 13/09088-8 - A história da Caatinga: explorando padrões filogeográficos e processos evolutivos em cada três anfíbios com dados de sequenciamento de nova geração
• Beneficiário: Maria Tereza Chiarioni Thomé
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 12/50255-2 - Filogeografia de anfibios comuns em regioes pouco estudadas do brasil:a caatinga e a regiao subtropical.
• Beneficiário: João Miguel de Barros Alexandrino
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• 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
• Processo FAPESP: 11/51392-0 - A história da Caatinga: filogeografia comparada de anfíbios enfrentando um bioma xérico
• Beneficiário: Maria Tereza Chiarioni Thomé
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/03428-5 - Dimensions US-BIOTA-Sao Paulo: características preditoras da diversificação adaptativa na Diagonal Seca Brasileira
• Beneficiário: Vera Nisaka Solferini
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 13/50741-7 - Diversidade e conservação dos anfíbios brasileiros
• Beneficiário: Célio Fernando Baptista Haddad
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático