Skip to main content

Free Content Synergistic Effects of UVR and Temperature on the Survival of Azooxanthellate and Zooxanthellate Early Developmental Stages of Soft Corals

Download Article:
(PDF 361.744140625 kb)


The interaction between ambient water temperature and UVR and its possible effect on the survival of coral early life-history stages was investigated in the Red Sea soft corals Heteroxenia fuscescens Eherenberg, 1834, and Rhytisma fulvum fulvum Forsskål, 1775. Planulae and azoo- and zooxanthellate polyps were obtained from colonies collected from the coral reefs at Eilat (Gulf of Aqaba, northern Red Sea). Survival of the different developmental stages under different UVR regimes was examined in the laboratory and monitored every 12 hrs until 50% survival (i.e., LD50) was attained. Maximal LD50 value for H. fuscescens planulae under exposure to UVR was only 70 hrs whereas the unexposed planulae showed 100% survival over the same time period. Survival of Azooxanthellate primary polyps of H. fuscescens increased with higher temperatures under UVR exposure, and zooxanthellate polyps had higher rates of survival than azooxanthellate polyps at 26 °C. Rhytisma fulvum fulvum planulae had higher survival rates compared to those of H. fuscescens planulae, and azoo- and zooxanthellate primary polyps. Our results demonstrate that UVR and elevated temperature may have a synergistic effect on the survival of soft corals at early life-history stages. In addition, Mycosporine-like amino acids (MAAs) may have played a role in the survival of the different juvenile stages of the two studied species.

Document Type: Research Article

Publication date: 2008-09-01

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more