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<title lang=en>From the geochemistry of coral reef fish otoliths to climate : what can we learn from the example ofTaiaro lagoon ?</title>
<creator>Morat, F.</creator>
<creator>Blamart, D.</creator>
<creator>Lecomte-Finiger, Raymonde</creator>
<creator>Planes, Serge</creator>
<creator>Galzin, René</creator>
<contributor>Irstea</contributor>
<contributor>Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE) ; Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) - Commissariat à l'énergie atomique et aux énergies alternatives (CEA) - Université Paris-Saclay - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Centre de recherches insulaires et observatoire de l'environnement (CRIOBE) ; Université de Perpignan Via Domitia (UPVD) - École pratique des hautes études (EPHE) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire d'Excellence CORAIL (LabEX CORAIL) ; Institut de Recherche pour le Développement (IRD) - Université des Antilles et de la Guyane (UAG) - École des hautes études en sciences sociales (EHESS) - École pratique des hautes études (EPHE) - Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) - Université de la Réunion (UR) - Université de la Polynésie Française (UPF) - Université de Nouvelle Calédonie - Institut d'écologie et environnement</contributor>
<description>International audience</description>
<source>ISSN: 0240-8759</source>
<source>Vie et Milieu</source>
<publisher>Laboratoire Arago</publisher>
<identifier>hal-01162477</identifier>
<identifier>https://hal-univ-perp.archives-ouvertes.fr/hal-01162477</identifier>
<source>https://hal-univ-perp.archives-ouvertes.fr/hal-01162477</source>
<source>Vie et Milieu, Laboratoire Arago, 2015, 65 (1), pp.21-28</source>
<language>en</language>
<subject lang=en>Coral</subject>
<subject lang=en>Climate Change</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The analysis of the C-O stable isotope composition of coral reef fish otoliths from Taiaro, a French Polynesian atoll normally isolated from the Pacific Ocean, has been performed to address two main questions. The first is to confirm previous results which suggest that a lagoonal coral reef fish population is able to achieve its ontogenetic cycle without any open ocean phase. If so, are O isotopic values of otoliths an indicator of temperature fluctuations in the tropical Pacific Ocean related to climate change and in particular temperature variations of water masses? δ18O and δ13C values on both lagoon and open ocean fish otoliths caught in 2006 indicated clearly that O-isotopes reached the isotopic equilibrium; in contrast, all δ13C values exhibited a strong isotopic disequilibrium related to metabolic activity. Stable isotope compositions revealed a clear differentiation between fish from lagoons and those from the open ocean (with a δ18O enrichment of 1 ‰ in favour of the lagoon). This confirmed a lack of connectivity between habitats and that fish from lagoon lived their entire life cycle in the lagoon. Both δ18O and δ13C data indicated differences between nucleus and edge signatures with changes in fish behavior from the larval life to adulthood (habitat, diet, etc.), and a clear adaptation of dietary behavior of lagoon fish. The comparison of the 2006 data set with those of 1994 showed that environmental conditions were stable in the lagoon, leading to a very narrow range of variations in the δ18O values. δ18O of fish otoliths of the open ocean exhibited a wider variation (+0.25 ‰) between 1994 and 2006, suggesting a decrease in temperature linked to a change of SST, which can be interpreted in terms of climate change associated with El Nino Southern Oscilation (ENENSO). These differences could also be due to a switch of habitats during the life cycle of fish from the open ocean.</description>
<date>2015</date>
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