Do sicydium punctatum adults move in the Caribbean estuaires? New insight from strontium isotopes

H. Tabouret (1, 2) , D. Monti (3) , J. Martin (4, 1) , Sylvain Bérail (1) , Christophe Pécheyran (1) , P. Keith (2) , Gilles Bareille (1)

1 CNRS - Centre National de la Recherche Scientifique
2 BOREA - Biologie des Organismes et Ecosystèmes Aquatiques
3 Université des Antilles (Pôle Guadeloupe)
4 UR EABX - Ecosystèmes aquatiques et changements globaux

Strontium isotopic variations (87Sr:86Sr) were investigated in otoliths of an amphidromous goby, Sicydium punctatum, coming from a tropical insular river and showing contrasted depositional patterns of barium:calcium in otolith (Ba:Caotolith). In our study, varying as well as non-varying Ba:Caotolith individuals exhibited unchanged 87Sr:86Srotolith throughout the adult phase with values typical of stream water flowing through volcanic substrate (0.7053 ± 0.0003). These results unambiguously discard the Ba:Caotolith peaks as markers of migrations between freshwater and brackish estuarine water during the adult phase of the species and open on investigations of sources of variations on microhabitats or unknown physiological effects.

Mots clés: MIGRATIONS; OTOLITH MICROCHEMISTRY; STRONTIUM; INSULAR RIVERS; SICYDIINAE

Domaines: Sciences de l'environnement

H. Tabouret, D. Monti, J. Martin, Sylvain Bérail, Christophe Pécheyran, et al.. Do sicydium punctatum adults move in the Caribbean estuaires? New insight from strontium isotopes. Vie et Milieu / Life & Environment, 2015, 65 (2), pp.85-89. ⟨hal-02601708⟩