DISTRIBUTION OF PYRODINIUM BAHAMENSE VAR. COMPRESSUM AND OTHER DINOFLAGELLATE CYSTS IN SURFACE SEDIMENTS OF CANCABATO BAY, LEYTE, PHILIPPINES
Cysts withstand hostile environmental conditions and are source of inoculum for recurrent blooms. In the Philippines, the first recorded bloom of the phytoplankton, Pyrodinium bahamense var. compressum (Pbc) was observed in Samar-Leyte areas including Cancabato Bay in 1983. Since then, shellfish bans here had been imposed periodically. But until the present, there is no thorough study done on dinoflagellate cysts in this bay. This study assessed the abundance and distribution of dinoflagellate cysts in the area. Surface sediment samples were collected and characterized. Palynological technique was used for cyst processing. A total of 21 species of dinoflagellate cysts were identified that belonged to 5 groups: Gonyaulacoid, Protoperidinioid, Gymnodinioid, Calciodinellid and Diplopsalid. Cysts were detected in all stations, with cyst densities ranging from 1-80 cysts g-1 DW. Protoceratium reticulatum was the dominant species in 4 stations. Low levels of Pbc cysts were detected in 13 stations, the densest Pbc cysts count was at 16 cysts g-1 DW. Most cysts were concentrated in the inner part of the bay. Concentrations of cysts were affected by several factors including substrate type, current speed, depth, and carbonate content. This important stage of the lifecycle of dinoflagellates will be factored in future models to predict Pbc blooms in the bay.
Yap-Dejeto, L. G., University of the Philippines Visayas-Tacloban College, Philippines, firstname.lastname@example.org
Durante, Y. C., University of the Philippines Visayas-Tacloban College, Philippines
Tan, I. L., University of the Philippines Visayas-Tacloban College, Philippines
Time: 11:00 - 12:00
Location: Poster/Exhibit Hall
Presentation is given by student: No