PSII activity and pigment dynamics of Symbiodinium in two Indo-Pacific corals exposed to short-term high-light stress
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This study examined the capacity for photoprotection and repair of photo-inactivated photosystem II in the same Symbiodinium clade associated with two coexisting coral species during high-light stress in order to test for the modulation of the symbiont’s photobiological response by the coral host. After 4 days exposure to in situ irradiance, symbionts of the bleaching-sensitive Pocillopora damicornis showed rapid synthesis of photoprotective pigments (by 44 %) and strongly enhanced rates of xanthophyll cycling (by 446 %) while being insufficient to prevent photoinhibition (sustained loss in F v/F m at night) and loss of symbionts after 4 days. By contrast, Pavona decussata showed no significant changes in F v/F m, symbiont density or xanthophyll cycling. Given the association with the same Symbiodinium clade in both coral species, our findings suggest that symbionts in the two species examined may experience different in hospite light conditions as a result of different biometric properties of the coral host.
KeywordsCoral Species Lincomycin Effective Quantum Yield Coral Host Symbiotic Dinoflagellate
We are grateful to Malin Gustafsson for valuable field assistance and to the staff of Heron Island Research Station for their support. Furthermore, we would like to thank the anonymous reviewers and Dr. David Suggett for their detailed critical comments and suggestions on earlier versions of this paper. This study was financially supported by the Comprehensive Research Funding Programme (CRFP) at the University of Bremen (Project No. 02/115/06). We also thanks support by the Bremen International Graduate School for Marine Sciences (GLOMAR) that is funded by the German Research Foundation (DFG) within the frame of the Excellence Initiative by the German federal and state governments to promote science and research at German universities. Further, this project was supported by means of the Terry Walker Price awarded by the Australian Coral Reef Society (ACRS) to Verena Schrameyer in 2010. Corals were collected under Great Barrier Marine Park Authority (GBRMPA) permit number G09/30854.1.
- Bhagooli R, Hidaka M (2004) Photoinhibition, bleaching susceptibility and mortality in two scleractinian corals, Platygyra ryukyuensis and Stylophora pistillata, in response to thermal and light stresses. Comp Biochem Physiol A: Mol Integr Physiol 137:547–555. doi: 10.1016/j.cbpb.2003.11.008 CrossRefGoogle Scholar
- Brown B, Ambarsari I, Warner M, Fitt W, Dunne R, Gibb S, Cummings D (1999) Diurnal changes in photochemical efficiency and xanthophyll concentrations in shallow water reef corals: evidence for photoinhibition and photoprotection. Coral Reefs 18:99–105. doi: 10.1007/s003380050163 CrossRefGoogle Scholar
- Fitt W, Gates R, Hoegh-Guldberg O, Bythell J, Jatkar A, Grottoli A, Gomez M, Fisher P, LaJeunesse T, Pantos O, Iglesias-Prieto R, Franklin D, Rodrigues L, Torregiani J, van Woesik R, Lesser M (2009) Response of two species of Indo-Pacific corals, Porites cylindrica and Stylophora pistillata, to short-term thermal stress: the host does matter in determining the tolerance of corals to bleaching. J Exp Mar Biol Ecol 373:102–110. doi: 10.1016/j.jembe.2009.03.011 CrossRefGoogle Scholar
- Hill R, Ulstrup K, Ralph P (2009) Temperature induced changes in thylakoid membrane thermostability of cultured, freshly isolated, and expelled zooxanthellae from scleractinian corals. Bull Mar Sci 85:223–244Google Scholar
- Hoegh-Guldberg O, Smith GJ (1989a) The effect of sudden changes in temperature, light and salinity on the population density and export of zooxanthellae from the reef corals Stylophora pistillata Esper and Seriatopora hystrix Dana. J Exp Mar Biol Ecol 129:279–303. doi: 10.1016/0022-0981(89)90109-3 CrossRefGoogle Scholar
- Hoegh-Guldberg O, Smith GJ (1989b) Influence of the population density of zooxanthellae and supply of ammonium on the biomass and metabolic characteristics of the reef corals Seriatopora hystrix and Stylophora pistillata. Mar Ecol Prog Ser 57:173–186. doi: 10.4319/lo.2008.53.5.1853 CrossRefGoogle Scholar
- Muscatine L (1990) The role of symbiotic algae in carbon and energy flux in reef corals. In: Dubinsky Z (ed) Ecosystems of the world, vol 25., Coral reefsElsevier, New York, pp 75–87Google Scholar
- Schreiber U (2004) Pulse-amplitude-modulation (PAM) Fluorometry and saturation pulse method: an overview. In: Papageorgiou G, Govindjee (eds) Chlorophyll a fluorescence: A Signature of Photosynthesis. Springer, Dordrecht, The Netherlands, pp 279–319Google Scholar
- Six C, Finkel ZV, Irwin AJ, Campbell DA (2007) Light variability illuminates niche-partitioning among marine picocyanobacteria. PLoS ONE 2 doi: 10.1371/journal.pone.0001341