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Seascape genomics reveals limited dispersal and suggests spatially varying selection among European populations of sea lamprey (Petromyzon marinus)
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Orientador(es)
Resumo(s)
Sea lamprey Petromyzon marinus is an anadromous and semelparous fish without
homing behaviors. Despite being a freshwater, free-living organism for a large part
of their life cycle, its adulthood is spent as a parasite of marine vertebrates. In their
native European range, while it is well-established that sea lampreys comprise a single
nearly-panmictic population, few studies have further explored the evolutionary history of natural populations. Here, we performed the first genome-wide characterization of sea lamprey's genetic diversity in their European natural range. The objectives
were to investigate the connectivity among river basins and explore evolutionary
processes mediating dispersal during the marine phase, with the sequencing of 186
individuals from 8 locations spanning the North Eastern Atlantic coast and the North
Sea with double-digest RAD-sequencing, obtaining a total of 30,910 bi-allelic SNPs.
Population genetic analyses reinforced the existence of a single metapopulation
encompassing freshwater spawning sites within the North Eastern Atlantic and the
North Sea, though the prevalence of private alleles at northern latitudes suggested
some limits to the species' dispersal. Seascape genomics suggested a scenario where
oxygen concentration and river runoffs impose spatially varying selection across their
distribution range. Exploring associations with the abundance of potential hosts further suggested that hake and cod could also impose selective pressures, although the
nature of such putative biotic interactions was unresolved. Overall, the identification
of adaptive seascapes in a panmictic anadromous species could contribute to conservation practices by providing information for restoration activities to mitigate local
extinctions on freshwater sites.
Descrição
Palavras-chave
Freshwater biodiversity Limited dispersal Petromyzon marinus Seascape genomics
Contexto Educativo
Citação
Baltazar-Soares, M., Britton, J. R., Pinder, A., Harrison, A. J., Dominguez, A. V., Andreou, D., Nunn, A. D., Bolland, J. D., Dodd, J. R., Quintella, B. R., Mateus, C. S., & Almeida, P. R. (2023). Seascape genomics reveals limited dispersal and suggests spatially varying selection among European populations of sea lamprey (Petromyzon marinus). Evolutionary Applications, 16(6), 1169–1183. https://doi.org/10.1111/eva.13561
Editora
Wiley-Blackwell