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Auteur (up) Rind, K.; Rodriguez-Barucg, Q.; Nicolas, D.; Cucchi, P.; Lignot, J.-H. doi  openurl
  Titre Morphological and physiological traits of Mediterranean sticklebacks living in the Camargue wetland (Rhone river delta) Type Article scientifique
  Année 2020 Publication Revue Abrégée J. Fish Biol.  
  Volume Numéro Pages  
  Mots-Clés 3-spined stickleback; ecological causes; Gasterosteus aculeatus; gasterosteus-aculeatus l; gill rakers; ion regulation; k+-atpase activity; morphometry; na+/k+-atpase; NKA activity; osmoregulation; oxygen consumption; oxygen-consumption; pelvic reduction; plate morph evolution; salinity; stickleback; threespine stickleback  
  Résumé Three-spined sticklebacks (Gasterosteus aculeatus L.) living at the southern limit of the species distribution range could possess specific morphological and physiological traits that enable these fish to live at the threshold of their physiological capacities. Morphological analysis was carried out on samples of sticklebacks living in different saline habitats of the Camargue area (Rhone delta, northern Mediterranean coast) obtained from 1993 to 2017. Salinity acclimation capacities were also investigated using individuals from freshwater-low salinity drainage canals and from mesohaline-euryhaline lagoons. Fish were maintained in laboratory conditions at salinity values close to those of their respective habitats: low salinity (LS, 5 parts per thousand) or seawater (SW, 30 parts per thousand). Fish obtained from a mesohaline brackish water lagoon (BW, 15 parts per thousand) were acclimated to SW or LS. Oxygen consumption rates and branchial Na+/K+-ATPase (NKA) activity (indicator of fish osmoregulatory capacity) were measured in these LS or SW control fish and in individuals subjected to abrupt SW or LS transfers. At all the studied locations, only the low-plated “leiurus” morphotype showed no spatial or temporal variations in their body morphology. Gill rakers were only longer and denser in fish sampled from the LS-freshwater (FW) drainage canals. All fish presented similar physiological capacities. Oxygen consumption rates were not influenced by salinity challenge except in SW fish transferred to LS immediately and 1 h after transfer. However, and as expected, gill NKA activity was salinity dependent. Sticklebacks of the Camargue area sampled from habitats with contrasted saline conditions are homogenously euryhaline, have low oxygen consumption rates and do not appear to experience significantly greater metabolic costs when challenged with salinity. However, an observed difference in gill raker length and density is most probably related to the nutritional condition of their habitat, indicating that individuals can rapidly acclimatize to different diets.  
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  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0022-1112 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000526005600001 Approuvé pas de  
  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2770  
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