| Autor: |
Rodriguero MS; Departamento de Ecología Genética y Evolución Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires, IEGEBA (CONICET-UBA) Intendente Güiraldes y Costanera Norte s/n 4to. Piso, Pabellón II, Ciudad Universitaria CI1428 EHA Ciudad Autónoma de Buenos Aires Argentina., Lanteri AA; División Entomología Museo de La Plata Facultad de Ciencias Naturales y Museo Universidad Nacional de La Plata Paseo del Bosque s/n 1900 La Plata Argentina., Guzmán NV; Departamento de Ecología Genética y Evolución Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires, IEGEBA (CONICET-UBA) Intendente Güiraldes y Costanera Norte s/n 4to. Piso, Pabellón II, Ciudad Universitaria CI1428 EHA Ciudad Autónoma de Buenos Aires Argentina., Carús Guedes JV; Departamento de Defesa Fitossanitária Centro de Ciências Rurais Universidade Federal de Santa Maria Prédio 42, Campus Universitário 97105-900 Santa Maria Rio Grande do Sul Brazil., Confalonieri VA; Departamento de Ecología Genética y Evolución Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires, IEGEBA (CONICET-UBA) Intendente Güiraldes y Costanera Norte s/n 4to. Piso, Pabellón II, Ciudad Universitaria CI1428 EHA Ciudad Autónoma de Buenos Aires Argentina. |
| Abstrakt: |
Previous research revealed complex diversification patterns in the parthenogenetic weevil Naupactus cervinus. To understand the origin of clonal diversity and successful spreading of this weevil, we investigated its geographic origin and possible dispersal routes and whether parthenogens can persist in habitats under unsuitable environmental conditions. This study is based on samples taken throughout a broad area of the species' range. We used both mitochondrial and nuclear markers and applied phylogenetic and network analyses to infer possible relationships between haplotypes. Bayesian phylogeographic analyses and ecological niche modeling were used to investigate the processes that shaped genetic diversity and enabled the colonization of new geographic areas. Southeastern Brazil emerges as the original distribution area of N. cervinus. We detected two range expansions, one along natural corridors during the Pleistocene and the other in countries outside South America during recent times. Isolation due to climate shifts during the early Pleistocene led to diversification in two divergent clades, which probably survived in different refugia of the Paranaense Forest and the Paraná River delta. The origin of the clonal diversity was probably a complex process including mutational diversification, hybridization, and secondary colonization. The establishment of N. cervinus in areas outside its native range may indicate adaptation to drier and cooler conditions. Parthenogenesis would be advantageous for the colonization of new environments by preventing the breakup of successful gene combinations. As in other insect pests, the present distribution of N. cervinus results from both its evolutionary history and its recent history related to human activities. |
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