Osmoregulation as a potential factor for the differential distribution of two cryptic gobiid species, Pomatoschistus microps and P. marmoratus in French Mediterranean lagoons

Authors

  • François Rigal Laboratoire Ecosystèmes Lagunaires, Université Montpellier II
  • Thibaud Chevalier Laboratoire Ecosystèmes Lagunaires, Université Montpellier II
  • Catherine Lorin-Nebel Equipe Adaptation Ecophysiologique et Ontogenèse, Université Montpellier II.
  • Guy Charmantier Equipe Adaptation Ecophysiologique et Ontogenèse, Université Montpellier II.
  • Jean-Antoine Tomasini Laboratoire Ecosystèmes Lagunaires, Université Montpellier II
  • Fabien Aujoulat Equipe Adaptation Ecophysiologique et Ontogenèse, Université Montpellier II.
  • Patrick Berrebi Laboratoire Ecosystèmes Lagunaires, Université Montpellier II

DOI:

https://doi.org/10.3989/scimar.2008.72n3469

Keywords:

competition, lagoons, osmoregulation, Pomatoschistus, salinity tolerance

Abstract


This study was aimed at the detection of potential differences in the osmoregulatory capacity of two cryptic species of gobies, Pomatoschistus microps (Krøyer, 1838) and P. marmoratus (Risso, 1810), that have different distributions in French Mediterranean lagoons characterised by different salinity regimes. Specimens of both species were experimentally exposed to different salinities, their salinity tolerance was evaluated and their blood osmolality was measured. Both species are strong osmoregulators over a wide range of salinities but P. microps showed higher performances of hyper-regulation at very low salinities (10 and 40 mosm/kg, i.e. freshwater 0.3 and 1.4) and of hypo-regulation at high salinities (1500 mosm/kg, 51). Only P. microps was able to tolerate freshwater exposure over 4 days. We conclude that the high osmoregulatory capacity found in P. microps is linked to its better survival at very low salinities and is a physiological requirement for living in areas such as the Mauguio lagoon where salinity is highly variable. In contrast, as osmoregulation of P. marmoratus is less efficient at extreme salinities, this species cannot colonise such environments and is restricted to habitats where salinity is more stable, such as the Thau lagoon.

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Author Biographies

François Rigal, Laboratoire Ecosystèmes Lagunaires, Université Montpellier II

Equipe Adaptation Ecophysiologique et Ontogenèse, Université Montpellier II.

Thibaud Chevalier, Laboratoire Ecosystèmes Lagunaires, Université Montpellier II

Equipe Adaptation Ecophysiologique et Ontogenèse, Université Montpellier II.

Patrick Berrebi, Laboratoire Ecosystèmes Lagunaires, Université Montpellier II

Institut des Sciences de l’Evolution, Université Montpellier II.

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Published

2008-09-30

How to Cite

1.
Rigal F, Chevalier T, Lorin-Nebel C, Charmantier G, Tomasini J-A, Aujoulat F, Berrebi P. Osmoregulation as a potential factor for the differential distribution of two cryptic gobiid species, Pomatoschistus microps and P. marmoratus in French Mediterranean lagoons. Sci. mar. [Internet]. 2008Sep.30 [cited 2024Mar.28];72(3):469-76. Available from: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1004

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