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• W2360116652 endingPage "e0154766" @default.
• W2360116652 startingPage "e0154766" @default.
• W2360116652 abstract "Marine species have colonized extreme environments during evolution such as freshwater habitats. The amphidromous teleost fish, Galaxias maculatus is found mainly migrating between estuaries and rivers, but some landlocked populations have been described in lakes formed during the last deglaciation process in the Andes. In the present study we use mtDNA sequences to reconstruct the historical scenario of colonization of such a lake and evaluated the osmoregulatory shift associated to changes in habitat and life cycle between amphidromous and landlocked populations.Standard diversity indices including the average number of nucleotide differences (Π) and the haplotype diversity index (H) indicated that both populations were, as expected, genetically distinctive, being the landlocked population less diverse than the diadromous one. Similarly, pairwise GST and NST comparison detected statistically significant differences between both populations, while genealogy of haplotypes evidenced a recent founder effect from the diadromous stock, followed by an expansion process in the lake. To test for physiological differences, individuals of both populations were challenged with a range of salinities from 0 to 30 ppt for 8 days following a period of progressive acclimation. The results showed that the landlocked population had a surprisingly wider tolerance to salinity, as landlocked fish survival was 100% from 0 to 20 ppt, whereas diadromous fish survival was 100% only from 10 to 15 ppt. The activity of ATPase enzymes, including Na+/K+-ATPase (NKA), and H+-ATPase (HA) was measured in gills and intestine. Activity differences were detected between the populations at the lowest salinities, including differences in ATPases other than NKA and HA. Population differences in mortality are not reflected in enzyme activity differences, suggesting divergence in other processes.These results clearly demonstrate the striking adaptive changes of G. maculatus osmoregulatory system, especially at hyposmotic environments, associated to a drastic shift in habitat and life cycle at a scale of a few thousand years." @default.
• W2360116652 created "2016-06-24" @default.
• W2360116652 creator A5012783603 @default.
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• W2360116652 date "2016-05-11" @default.
• W2360116652 modified "2023-10-01" @default.
• W2360116652 title "Isolation Driven Divergence in Osmoregulation in Galaxias maculatus (Jenyns, 1848) (Actinopterygii: Osmeriformes)" @default.
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• W2360116652 doi "https://doi.org/10.1371/journal.pone.0154766" @default.
• W2360116652 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4864355" @default.
• W2360116652 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27168069" @default.
• W2360116652 hasPublicationYear "2016" @default.
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