%0 Journal Article
%T Highly contrasted responses of Mediterranean octocorals to climate change along a depth gradient
%+ Mathématiques pour l'Industrie et la Physique (MIP)
%+ Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE)
%+ Institut méditerranéen d'océanologie (MIO)
%A Masmoudi, M.
%A Kara, H.
%A Chaoui, L.
%A Aurelle, D.
%A Pivotto, I. D.
%A Nerini, David
%< avec comité de lecture
%@ 2054-5703
%J Royal Society Open Science
%I The Royal Society
%V 2
%N 5
%8 2015-05
%D 2015
%R 10.1098/rsos.140493
%Z Environmental Sciences/Biodiversity and EcologyJournal articles
%X Climate change has a strong impact on marine ecosystems, including temperate species. Analysing the diversity of thermotolerance levels within species along with their genetic structure enables a better understanding of their potential response to climate change. We performed this integrative study on the Mediterranean octocoral Eunicella cavolini, with samples from different depths and by means of a common garden experiment. This species does not host photosynthetic Symbiodinium, enabling us to focus on the cnidarian response. We compared the thermotolerance of individuals from 20 m and 40 m depths from the same site and with replicates from the same colony. On the basis of an innovative statistical analysis of necrosis kinetics and risk, we demonstrated the occurrence of a very different response between depths at this local scale, with lower thermotolerance of deep individuals. Strongly thermotolerant individuals were observed at 20 m with necrosis appearing at higher temperatures than observed in situ. On the basis of nine microsatellite loci, we showed that these marked thermotolerance differences occur within a single population. This suggests the importance of acclimatization processes in adaptation to these different depths. In addition, differences between replicates demonstrated the occurrence of a variability of response between fragments from the same colony with the possibility of an interaction with a tank effect. Our results provide a basis for studying adaptation and acclimatization in Mediterranean octocorals in a heterogeneous environment.
%G English
%L hal-01445197
%U https://hal.science/hal-01445197
%~ SDE
%~ INSU
%~ UNIV-AVIGNON
%~ UNIV-TLSE3
%~ UNIV-TLN
%~ CNRS
%~ UNIV-AMU
%~ INSA-TOULOUSE
%~ MIO
%~ IMBE
%~ OSU-INSTITUT-PYTHEAS
%~ GIP-BE
%~ UT1-CAPITOLE
%~ INSA-GROUPE
%~ OEB
%~ MIO-EMBIO
%~ UNIV-UT3
%~ UT3-INP
%~ UT3-TOULOUSEINP