Academic Journal

Recovery from bleaching is mediated by threshold densities of background thermo-tolerant symbiont types in a reef-building coral

التفاصيل البيبلوغرافية
العنوان: Recovery from bleaching is mediated by threshold densities of background thermo-tolerant symbiont types in a reef-building coral
المؤلفون: Line K. Bay, Jason Doyle, Murray Logan, Ray Berkelmans
المصدر: Royal Society Open Science, Vol 3, Iss 6 (2016)
بيانات النشر: The Royal Society, 2016.
سنة النشر: 2016
المجموعة: LCC:Science
مصطلحات موضوعية: symbiodinium, coral, shuffling, thermal stress, physiological adaptation, Science
الوصف: Sensitive molecular analyses show that most corals host a complement of Symbiodinium genotypes that includes thermo-tolerant types in low abundance. While tolerant symbiont types are hypothesized to facilitate tolerance to temperature and recovery from bleaching, empirical data on their distribution and relative abundance in corals under ambient and stress conditions are still rare. We quantified visual bleaching and mortality of coral hosts, along with relative abundance of C- and D-type Symbiodinium cells in 82 Acropora millepora colonies from three locations on the Great Barrier Reef transplanted to a central inshore site over a 13 month period. Our analyses reveal dynamic change in symbiont associations within colonies and among populations over time. Coral bleaching and declines in C- but not D-type symbionts were observed in transplanted corals. Survival and recovery of 25% of corals from one population was associated with either initial D-dominance or an increase in D-type symbionts that could be predicted by a minimum pre-stress D : C ratio of 0.003. One-third of corals from this population became D dominated at the bleached stage despite no initial detection of this symbiont type, but failed to recover and died in mid to late summer. These results provide a predictive threshold minimum density of background D-type symbionts in A. millepora, above which survival following extreme thermal stress is increased.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 2054-5703
Relation: https://doaj.org/toc/2054-5703
DOI: 10.1098/rsos.160322
URL الوصول: https://doaj.org/article/b2da533498f848fd90d26dc924aa4bd5
رقم الانضمام: edsdoj.b2da533498f848fd90d26dc924aa4bd5
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:20545703
DOI:10.1098/rsos.160322