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

L. Vargas-Chacoff; F. Moneva; R. Oyarzún; D. Martínez; J. L.P. Muñoz; C. Bertrán; J. M. Mancera

doi:10.1007/s00300-014-1515-9

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

L. Vargas-Chacoff^*, F. Moneva, R. Oyarzún, D. Martínez, J. L.P. Muñoz, C. Bertrán, J. M. Mancera

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	1235-1245
Number of pages	11
Journal	Polar Biology
Volume	37
Issue number	9
DOIs	https://doi.org/10.1007/s00300-014-1515-9
State	Published - 2014
Externally published	Yes

Bibliographical note

Funding Information:
Acknowledgments This study was carried out in the framework of FONDECYT Project 1110235. We thank Dr. Lafayette Eaton and Mr. Ignacio Ruiz-Jarabo (Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, España) for their help checking this manuscript and the Dirección de Investigación of the Universidad Austral de Chile (DID).

ASJC Scopus subject areas

General Agricultural and Biological Sciences

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10.1007/s00300-014-1515-9

Cite this

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title = "Environmental salinity-modified osmoregulatory response in the sub-Antarctic notothenioid fish Eleginops maclovinus",

abstract = "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.",

keywords = "Cortisol, Eleginops maclovinus, Osmoregulatory organs, Salinity",

author = "L. Vargas-Chacoff and F. Moneva and R. Oyarz{\'u}n and D. Mart{\'i}nez and Mu{\~n}oz, {J. L.P.} and C. Bertr{\'a}n and Mancera, {J. M.}",

note = "Funding Information: Acknowledgments This study was carried out in the framework of FONDECYT Project 1110235. We thank Dr. Lafayette Eaton and Mr. Ignacio Ruiz-Jarabo (Departamento de Biolog{\'i}a, Facultad de Ciencias del Mar y Ambientales, Universidad de C{\'a}diz, Espa{\~n}a) for their help checking this manuscript and the Direcci{\'o}n de Investigaci{\'o}n of the Universidad Austral de Chile (DID).",

year = "2014",

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doi = "10.1007/s00300-014-1515-9",

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AU - Moneva, F.

AU - Oyarzún, R.

AU - Martínez, D.

AU - Muñoz, J. L.P.

AU - Bertrán, C.

AU - Mancera, J. M.

N1 - Funding Information: Acknowledgments This study was carried out in the framework of FONDECYT Project 1110235. We thank Dr. Lafayette Eaton and Mr. Ignacio Ruiz-Jarabo (Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, España) for their help checking this manuscript and the Dirección de Investigación of the Universidad Austral de Chile (DID).

PY - 2014/9

Y1 - 2014/9

N2 - 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.

AB - 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.

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JO - Polar Biology

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ER -

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

Abstract

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ASJC Scopus subject areas

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