Seasonal fluctuations in photochemical efficiency of symbiodinium harbored by three reef-building corals that differ in bleaching susceptibility

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dc.contributor.authorChauka, Leonard J.
dc.contributor.authorMbije, Nsajigwa E
dc.contributor.authorKangwe, Simon J
dc.date.accessioned2022-08-01T06:46:06Z
dc.date.available2022-08-01T06:46:06Z
dc.date.issued2015
dc.descriptionJournal Articleen_US
dc.description.abstractCoral reefs are amongst the most vulnerable ecosystems to climate change. This study was conducted to evaluate the fluxes in the adaptations of reef-building corals to climate change. In order to explore this, chlorophyll a fluorescence, Symbiodinium abundance and types were monitored in nursery-reared corals for two years in three species that differ in bleaching susceptibility. The species were Pocillopora verrucosa, Porites cylindrica and Acropora formosa. Internal transcribed spacer two (ITS-2) region of nuclear ribosomal DNA genes (rDNA) was used in monitoring the Symbiodinium types associated with the studied coral species. Pulse Amplitude Modulated (PAM) fluorometry was used to determine seasonal changes in chlorophyll a fluorescence. In this study, it was found that A. formosa, P. verrucosa and P. cylindrica maintained their Symbiodinium types; C3u, C1h, and C15 respectively throughout the seasons. A. formosa and P. verrucosa responded significantly to seasonal fluctuation in both solar radiation and sea surface temperature by regulating their Symbiodinium cell density and photochemical efficiency whereas P. cylindrica did not. However, such seasonal fluctuations in these environmental parameters are not accompanied by acquisition of foreign Symbiodinium types from the environmental pool. It is concluded that seasonal fluctuations in both solar radiations and sea surface temperatures are not intense enough to effect acquisition of foreign Symbiodinium types by reef building corals in Zanzibar watersen_US
dc.identifier.issn0856-860X
dc.identifier.urihttp://www.suaire.sua.ac.tz/handle/123456789/4354
dc.language.isoenen_US
dc.subjectCoral Reefsen_US
dc.subjectChlorophyll a fluorescenceen_US
dc.subjectSymbiodiniumen_US
dc.subjectPAM fluorometryen_US
dc.subjectPhotosynthesisen_US
dc.subjectResilienceen_US
dc.titleSeasonal fluctuations in photochemical efficiency of symbiodinium harbored by three reef-building corals that differ in bleaching susceptibilityen_US
dc.typeArticleen_US

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