Diversity patterns and speciation processes in a two-island system with continuous migration

Autor(es)

Princepe, Debora ; Czarnobai, Simone ; Pradella, Thiago M. ; Caetano, Rodrigo A. ; Marquitti, Flavia M. D. ; de Aguiar, Marcus A. M. ; Araujo, Sabrina B. L.

• Tipo de documento: Artigo Científico
• Fonte: Evolution; v. 76, n. 10, p. 12-pg., 2022-09-06.

Resumo

Geographic isolation is a central mechanism of speciation, but perfect isolation of populations is rare. Although speciation can be hindered if gene flow is large, intermediate levels of migration can enhance speciation by introducing genetic novelty in the semi-isolated populations or founding small communities of migrants. Here, we consider a two-island neutral model of speciation with continuous migration and study diversity patterns as a function of the migration probability, population size, and number of genes involved in reproductive isolation (dubbed as genome size). For small genomes, low levels of migration induce speciation on the islands that otherwise would not occur. Diversity, however, drops sharply to a single species inhabiting both islands as the migration probability increases. For large genomes, sympatric speciation occurs even when the islands are strictly isolated. Then species richness per island increases with the probability of migration, but the total number of species decreases as they become cosmopolitan. For each genome size, there is an optimal migration intensity for each population size that maximizes the number of species. We discuss the observed modes of speciation induced by migration and how they increase species richness in the insular system while promoting asymmetry between the islands and hindering endemism. (AU)

• Processo FAPESP: 19/20271-5 - Modelos evolutivos em dinâmica de populações
• Beneficiário: Marcus Aloizio Martinez de Aguiar
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/11187-8 - Herança mitocondrial em árvores filogenéticas
• Beneficiário: Débora Princepe
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/01343-7 - ICTP Instituto Sul-Americano para Física Fundamental: um centro regional para física teórica
• Beneficiário: Nathan Jacob Berkovits
• Modalidade de apoio: Auxílio à Pesquisa - Projetos Especiais
• Processo FAPESP: 19/24449-3 - Evolução da interação genética mitonuclear
• Beneficiário: Débora Princepe
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado