Phenotypic and genetic differentiation between diadromous and landlocked puyen Galaxias maculatus

ROJO, J.H.; FERNÁNDEZ, D.A.; FIGUEROA, D.E.; BOY, C.C.

JOURNAL OF FISH BIOLOGY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2020 vol. 96 p. 956 - 967

0022-1112

We studied phenotypic andgenetic differences between individuals of puyen Galaxias maculatus from two sites in the same river basin in Tierradel Fuego National Park, southern South America. Individuals from the twosampling sites presented morphometric and genetic differences. The morphometricdifferences indicated that individuals from Laguna Negra (LN) were shorter,more robust, and with larger eyes, whereas those from Arroyo Negro (AN) werethinner, elongated, and with smaller eyes. Genetic differences showed that ANindividuals had a greater genetic structuration and an older demographichistory than LN individuals. From our results, we could affirm that theindividuals from the two sampling sites belong to different populations with ahigh degree of isolation. The demographic history could indicate that theindividuals of G. maculatus whichmigrated to northern areas during the last glaciation settled in the BeagleChannel after its formation. The LN population could have originated after theretreat of the glaciers, migrating from AN.