Quaternary refugia and secondary contact in the southern boundary of the Brazilian subregion: comparative phylogeography of freshwater fish

Vertebrate Zoology

article

María C. Bruno¹  Jorge R. Casciotta²  Adriana E. Almirón²  Fernando L. Ricillio⁴  Marta S. Lizarrade⁵ 

[1] Departamento de Biología, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata;División Zoología Vertebrados, Universidad Nacional de La Plata, Paseo del bosque s/n;Comisión de Investigaciones Científicas de la Provincia de Buenos Aires. Camino General Belgrano s/n;Cátedra de Histología y Embriología Animal, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata;Centro Regional de Estudios Genómicos, Facultad de Ciencias Exactas, Universidad Nacional de La Plata

关键词: Corydoras paleatus;    Jenynsia multidentata;    Control region;    Southern Pampean Area.;   

DOI  :  10.3897/vz.65.e31505

学科分类：社会科学、人文和艺术（综合）

来源: Pensoft

【 摘 要 】

Freshwater fish are an ideal model to illustrate how climate-tectonic changes affect the distribution of genetic variation. Freshwater bodies are extensively affected by environmental changes, with streams even changing their courses in the most extreme cases. Fortunately, this situation is reflected in the genetic composition of populations and may currently be inferred from the study of mitochondrial DNA molecular markers. Here we analyze and compare the phylogeographic patterns of the species Corydoras paleatus and Jenynsia multidentata at the southern limit of the Brazilian subregion. These basins are isolated in the current hydrogeographic pattern due to geologic and paleoclimatic changes. Our results support a concurrent pattern for both species. Some lineages have persisted in the area under adverse climate conditions, possibly in environmental refuges, while other lineages may have colonized the area later by means of paleodrainages connections. In addition, the presence of independent, greatly diverging lineages, even within the same watercourses, suggests secondary contact between these lineages. This work represents a first approach to understand how geologic and paleoclimatic changes have affected the distribution of genetic variation in the Southern Pampean Area.

【 授权许可】

CC BY