caa a22 4500 445818956 CHVBK 20180317145238.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s00338-010-0696-0 doi (NATIONALLICENCE)springer-10.1007/s00338-010-0696-0 Many corals host thermally resistant symbionts in high-temperature habitat [Elektronische Daten] [T. Oliver, S. Palumbi] Physiologically distinct lines of dinoflagellate symbionts, Symbiodinium spp., may confer distinct thermal tolerance thresholds on their host corals. Therefore, if a coral can alternately host distinct symbionts, changes in their Symbiodinium communities might allow corals to better tolerate increasing environmental temperatures. However, researchers are currently debating how commonly coral species can host different symbiont types. We sequenced chloroplast 23s rDNA from the Symbiodinium communities of nine reef-building coral species across two thermally distinct lagoon pools separated by ~500m. The hotter of these pools reaches 35°C in the summer months, while the other pool's maximum temperature is 1.5°C cooler. Across 217 samples from nine species, we found a single haplotype in both Symbiodinium clades A and D, but four haplotypes in Symbiodinium clade C. Eight of nine species hosted a putatively thermally resistant member of clade D Symbiodinium at least once, one of which hosted this clade D symbiont exclusively. Of the remaining seven that hosted multiple Symbiodinium types, six species showed higher proportions of the clade D symbiont in the hotter pool. Average percentage rise in the frequency of the clade D symbiont from the hotter to cooler pool was 52% across these six species. Even though corals hosted members of both the genetically divergent clades D and C Symbiodinium, some showed patterns of host-symbiont specificity within clade C. Both Acropora species that hosted clade C exclusively hosted a member of sub-clade C2, while all three Pocillopora species hosted a member of sub-clade C1 (sensu van Oppen et al. 2001). Our results suggest that coral-algal symbioses often conform to particular temperature environments through changes in the identity of the algal symbiont. Springer-Verlag, 2010 Symbiodinium nationallicence Host-symbiont specificity nationallicence Acropora nationallicence Pocillopora nationallicence Pavona nationallicence Platygyra nationallicence Millepora nationallicence Clade D water temperature nationallicence Oliver T. Department of Biological Sciences, Hopkins Marine Station, Stanford University, 120 Oceanview Boulevard, 93950, Pacific Grove, CA, USA aut Palumbi S. Department of Biological Sciences, Hopkins Marine Station, Stanford University, 120 Oceanview Boulevard, 93950, Pacific Grove, CA, USA aut Coral Reefs Springer-Verlag 30/1(2011-03-01), 241-250 0722-4028 30:1<241 2011 30 338 https://doi.org/10.1007/s00338-010-0696-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00338-010-0696-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Oliver T. Department of Biological Sciences, Hopkins Marine Station, Stanford University, 120 Oceanview Boulevard, 93950, Pacific Grove, CA, USA aut NATIONALLICENCE 700 1- Palumbi S. Department of Biological Sciences, Hopkins Marine Station, Stanford University, 120 Oceanview Boulevard, 93950, Pacific Grove, CA, USA aut NATIONALLICENCE 773 0- Coral Reefs Springer-Verlag 30/1(2011-03-01), 241-250 0722-4028 30:1<241 2011 30 338 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer