Does the coral host protect its algal symbionts from heat and light stresses?

Bhagooli, R, Baird, Andrew, and Ralph, Peter (2010) Does the coral host protect its algal symbionts from heat and light stresses? In: Proceedings of the 11th International Coral Reef Symposium. pp. 113-117. From: 11th International Coral Reef Symposium, 07 - 11 July 2008, Fort Lauderdale, FL, USA.

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This study investigated the potential protective role of the host by exposing coral larvae infected with two distinct clades of Symbiodinium (A and D) in two conditions, cultured and in hospite, to three combinations of heat and light levels (control: 24 °C + 40 μmol photons m-2 s-1; high temperature and low light (HT+LL): 31 °C + 40 μmol photons m-2 s-1; high temperature and high light (HT+HL): 31 °C + 390 μmol photons m-2 s-1). HT+HL treatments decreased maximum quantum yield of photosystem II, Fv/Fm, in both cultured and in hospite zooxanthellae, however, the effect was more pronounced in cultured samples. HT+LL led to a decrease in maximum relative photosynthetic electron transport rate (rETRmax) only in cultured algae, while high light reduced rETRmax in both Symbiodinium growth conditions, with rETRmax approaching zero in cultured Symbiodinium. When Symbiodinium cells in hospite were exposed to HT+HL treatments, non-photochemical quenching increased; however for cultured Symbiodinium it declined drastically indicating that this particular form of photoprotection was depleted. These results suggest that in hospite Symbiodinium sustain less photophysiological damage from HT+HL treatments in comparison to their respective free-living counterparts suggesting that the coral host provides some degree of protection to Symbiodinium from thermal and light stresses.

Item ID: 15553
Item Type: Conference Item (Research - E1)
Keywords: coral host, photo-physiology, stress, Symbiodinium
Date Deposited: 08 May 2011 23:28
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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