Feeding by the heterotrophic dinoflagellate Oxyrrhis marina on the red-tide raphidophyte Heterosigma akashiwo: a potential biological method to control red tides using mass-cultured grazers.

摘要: Abstract As part of the development a method to control outbreak and persistence red tides using mass-cultured heterotrophic protist grazers, we measured growth ingestion rates cultured Oxyrrhis marina (a dinoflagellate) on Heterosigma akashiwo raphidophyte) in bottles laboratory mesocosms (ca. 60 liter) nature, those grazer natural populations red-tide organism set up nature. In bottle incubation, specific O. increased rapidly with increasing concentration prey ca. 950 ng C ml−1 (equivalent 9,500 cells ml−1), but were saturated at higher concentrations. Maximum rate (μmax), KGR (prey sustaining 0.5 μmax) threshold H. 1.43 d−1, 104 ml−1, 8.0 respectively. clearance 1.27 grazer−1 d−1 0.3 μl graze...