Browsing by Author "Chauka, Leonard J."
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Item Antimicrobial and Cytotoxicity Activity of Clausena anisata, Acokanthera shemperii and Olea europaea Growing in Tanzania(European Journal of Medicinal Plants) Makirita, Winisia E.; Chauka, Leonard J.; Chacha, MusaItem Antimicrobial and Cytotoxicity Activity of Clausena Anisata, Acokanthera Shemperii and Olea Europaea Growing in TanzaniaMakirita, Winisia E.; Chauka, Leonard J.; Chacha, MusaItem Blind to Morphology: Genetic Identifies Several Widespread Ecologically Common Species and Few Endemics among Indo-Pacific Cauliflower Corals (Pocillopora, Scleractinia).Pinzón, Jorge H.; Sampayo, Eugenia M.; Cox, Evelyn F.; Chauka, Leonard J.; Chen, Chaolun A.; Voolstra, Christian R.; LaJeunesse, Todd C.Item Comparison of Endosymbiotic and Free-Living Symbiodinium (Dinophyceae) Diversity a Hawaiian Reef Environment. J PhycolPochon, Xavier; Stat, Michael; Takabayashi, Misaki; Chasqui, Luis; Chauka, Leonard J.; Logan, Daniel D. K.; Gates, Ruth D.Item Diversity of symbiotic algae in the genus Symbiodinium in Scleractinian corals of Tanzania(Western Indian Ocean Marine Science Association) Chauka, Leonard J.Item Diversity of symbiotic algae in the genus Symbiodinium in Scleractinian corals of Tanzania(Western Indian Ocean Marine Science Association) Chauka, Leonard J.Item Influence of local environmental conditions and bleaching histories on the diversity and distribution of Symbiodinium in reef-building corals in TanzaniaChauka, Leonard J.; Steinert, G.; Mtolera, M. S. P.Item Larvicidal Activity of Clausena Anisata Fruits and Leaves Extracts against Anopheles Gambiae Giless.S, Culex Quinquefasciatus Say and Aedes EgyptiaeMakirita, Winisia E.; Chauka, Leonard J.; Chacha, JumaItem Seasonal fluctuations in photochemical efficiency of symbiodinium harbored by three reef-building corals that differ in bleaching susceptibilityChauka, Leonard J.; Mbije, Nsajigwa E; Kangwe, Simon JItem Seasonal fluctuations in photochemical efficiency of symbiodinium harbored by three reef-building corals that differ in bleaching susceptibility(2015) Chauka, Leonard J.; Mbije, Nsajigwa E; Kangwe, Simon JCoral 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 watersItem Variation in Symbiodinium ITS2 Sequence Assemblages among Coral Colonies. PLoS ONE 6:e15854Stat, Michael; Bird, Christopher E.; Pochon, Xavier; Pochon, Xavier; Chasqui, Luis; Chauka, Leonard J.; Concepcion, Gregory; Logan, Daniel D. K.; Takabayashi, Misaki; Toonen, Robert J.; Gates, Ruth D.