THE DISTRIBUTION OF TOXIC DINOFLAGELLATES ON SEA GRASS Enhalus acoroides AT PARI ISLAND, SERIBU ISLANDS

Abstract

Benthic dinoflagellates causing Ciguatera Fish Poisoning (CFP), could be found attached either on macroalgae or sea grasses. Research on density and distribution of benthic dinoflagellates on sea grass leaves was conducted in Pari Island waters, Seribu Islands, in April 2012. Research was carried out by collecting Enhalus acoroides leaves from each site, and put inside the plastic jars containing seawater. In order to separate the dinoflagellates species from the leaves, the plastic jars were shaken vigorously and the seawater filtered through a series of sieves (125μm and 20μm). The resulted residue was than observed using Sedgewick rafter cell under light microscope. Based on samples collected, eight benthic dinoflagellates were found, where five of them were potentially toxic. They were Prorocentrum concavum, P. lima, P. rhathymum, Ostreopsis lenticularis, and O. siamensis. The highest abundance was found in the reef flat on the southern side of the island (652 sel/cm2 seagrass leaf). Research showed that the density and distribution of toxic dinoflagellates on sea grass at Pari Island, Seribu Islands were more influenced by local water currents.Keywords: benthic dinoflagellates, Ciguatera Fish Poisoning, Pari Island, seagrass

The role of habitat in the facilitation of Ostreopsis spp. blooms

“…The most sampled macroalgae are species forming medium to low complexity communities, such as shrubs formed by Padina spp., Dictyota spp., Halopteris spp. (Cabrini et al, 2010;Widiarti and Anggraini, 2012;Cohu et al, 2013;Blanfune et al, 2015;Boisnoir et al, 2019) and turfs formed by Corallina spp., Jania spp., Laurencia spp., Hypnea spp. (Simoni et al, 2004;Monti et al, 2007 ;Totti et al, 2010 ;Kim et al, 2011 ;Abbate et al, 2012;Ismael and Halim, 2012 ;Blanfuné et al, 2015;Yong et al, 2018).…”