stable photosymbiotic relationship under co2-induced acidification in the acoel worm symsagittifera roscoffensis稳定的photosymbiotic关系在acoel co2-induced酸化下蜗杆symsagittifera roscoffensis.pdfVIP

Stable Photosymbiotic Relationship under CO -Induced 2 Acidification in the Acoel Worm Symsagittifera Roscoffensis 1 ´ 2,3 4 Sam Dupont *, Aurelie Moya , Xavier Bailly ¨ ´ 1 Department of Marine Ecology, University of Gothenburg, Fiskebackskil, Sweden, 2 INSU-CNRS UPMC University of Paris 06, Laboratoire d’Oceanographie de ´ Villefranche, Villefranche-sur-mer, France, 3 ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Australia, 4 Universite Pierre et Marie Curie - CNRS, FR2424, Station Biologique de Roscoff, Roscoff, France Abstract As a consequence of anthropogenic CO2 emissions, oceans are becoming more acidic, a phenomenon known as ocean acidification. Many marine species predicted to be sensitive to this stressor are photosymbiotic, including corals and foraminifera. However, the direct impact of ocean acidification on the relationship between the photosynthetic and nonphotosynthetic organism remains unclear and is complicated by other physiological processes known to be sensitive to ocean acidification (e.g. calcification and feeding). We have studied the impact of extreme pH decrease/pCO2 increase on the complete life cycle of the photosymbiotic, non-calcifying and pure autotrophic acoel worm, Symsagittifera roscoffensis. Our results show that this