Are elemental and strontium isotopic microchemistry of otolith and histomorphometrical characteristics of vertebral bone useful to resolve the eel angilla obscura status in Lalolalo lake in Wallis Island ?

Gilles Bareille; Pierre Sasal; Nathalie Mary; F.J. Meunier; M.H. Deschamps; S. Berail; C. Pecheyran; Raymonde Lecomte-Finiger

Are elemental and strontium isotopic microchemistry of otolith and histomorphometrical characteristics of vertebral bone useful to resolve the eel angilla obscura status in Lalolalo lake in Wallis Island ?

Gilles Bareille ¹ Pierre Sasal ^{2, 3} Nathalie Mary ⁴ F.J. Meunier ⁵ M.H. Deschamps ⁶ S. Berail ¹ C. Pecheyran ¹ Raymonde Lecomte-Finiger ⁷

1 IPREM - Institut Pluridisciplinaire de Recherche sur l'Environnement et les Matériaux

2 Laboratoire d'excellence "CORAIL"

3 CRIOBE - Centre de recherches insulaires et observatoire de l'environnement

4 ETHYC'O - Etude des Hydrosystèmes Continentaux Tropicaux

5 BOREA - Biologie des Organismes et Ecosystèmes Aquatiques

6 Département des Sciences Animales

7 BETM - Biologie et écologie tropicale et méditerranéenne

Abstract : Otolith Sr/Ca, Ba/Ca and 87 Sr/ 86 Sr ratios and vertebral bone histomorphometry were used to investigate the life-history of Anguilla obscura eels from an enclosed lake, Lalolalo (Wallis Island in the Pacific), with no apparent connection with the sea. 87 Sr/ 86 Sr isotopic ratio from the core region gives evidence of indisputable marine origin of eels caught in the lake suggesting that underground connections between the lake and the sea exist. Sr/Ca and Ba/Ca ratios recorded after the elver mark are undifferentiated from seawater ones, thus limiting their used as marker of entrance in the lake and movement. However, 87 Sr/ 86 Sr isotopic ratio demonstrated that: 1) eels enter in the lake just after their metamorphosis and spend their entire adult life in the lake and 2) the lake chemistry is consistent with 1 % seawater-like contribution and 99 % basalt weathering and/or geothermal spring contribution. The vertebrae do not show a particular demineralization of bone matrix (45-52 %). Reversely, the study of bone compactness shows an important loss of bone that favors the hypothesis of a genital maturation that arises in the ecological state of the lake.

Keywords : Anguilla obscura otolith microchemistry isotopic ratios bone histomorphometry ecological status Lalolalo lake

Document type :

Journal articles

Domain :

Chemical Sciences

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Submitted on : Wednesday, June 3, 2015 - 2:04:24 PM
Last modification on : Tuesday, May 14, 2019 - 10:06:09 AM

Are elemental and strontium isotopic microchemistry of otolith and histomorphometrical characteristics of vertebral bone useful to resolve the eel angilla obscura status in Lalolalo lake in Wallis Island ?

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Are elemental and strontium isotopic microchemistry of otolith and histomorphometrical characteristics of vertebral bone useful to resolve the eel angilla obscura status in Lalolalo lake in Wallis Island ?

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