Environmental salinity-modified osmoregulatory response in the sub-Antarctic notothenioid fish Eleginops maclovinus

In this study we assessed changes in the osmoregulatory system of juvenile sub-Antarctic Eleginops maclovinus submitted to different environmental salinities (5, 15, 32 and 45 psu) using two different acclimation trials: (1) an end-point experiment (exposure for 14 days) and (2) a time course experi...

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Bibliographic Details
Published in:Polar biology 2014-09, Vol.37 (9), p.1235-1245
Main Authors: Vargas-Chacoff, L., Moneva, F., Oyarzún, R., Martínez, D., Muñoz, J. L. P., Bertrán, C., Mancera, J. M.
Format: Article
Language:English
Subjects:
Adenosine triphosphatase
Agnatha. Pisces
Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Biomedical and Life Sciences
Corticosteroids
Ecology
Eleginops maclovinus
Enzymes
Ethylenediaminetetraacetic acid
Fish
Fishes
Fundamental and applied biological sciences. Psychology
Lactates
Life Sciences
Marine biology
Metabolites
Microbiology
Oceanography
Original Paper
Osmosis
Particular ecosystems
Plant Sciences
Proteins
Salinity
Steroids
Synecology
Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution
Zoology
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Summary:In this study we assessed changes in the osmoregulatory system of juvenile sub-Antarctic Eleginops maclovinus submitted to different environmental salinities (5, 15, 32 and 45 psu) using two different acclimation trials: (1) an end-point experiment (exposure for 14 days) and (2) a time course experiment (specimens were sampled on days 1, 3, 7 and 14 post-transfer). Plasma osmolality, cortisol and metabolites (glucose, lactate and protein) values as well as Na + , K + -ATPase (NKA) activity were assessed in several osmoregulatory tissues (gills, kidney and intestine). In both trials, acclimation to different environmental salinities for 14 days induced changes in plasma metabolites (glucose, lactate and proteins) as well as cortisol values related to salinity challenges. Plasma osmolality and gill NKA activity presented a direct and positive relationship with respect to environmental salinity, while kidney NKA activity showed a “U-shaped” relationship. Anterior intestinal NKA activity increased in response to environmental salinity and apparently did not change in the middle portion of this organ, while it was enhanced in the posterior portion in environmental salinities different than seawater. Plasma metabolite values increased under hypo- and hypersaline conditions, indicating the importance of these energy substrates in extreme environments. The time course study revealed that specimens of E. maclovinus are able to accommodate their osmotic and metabolic system to respond to osmoregulatory challenges by allostatic changes.
ISSN:0722-4060
1432-2056
DOI:10.1007/s00300-014-1515-9