Effects of Phytoplankton Abundance on Excystment of Tintinned Ciliates from Marine Sediments

I have examined the effects of abundance of two species of phytoplankton, Pavlova lutheri and Heterocapsa triquetra, on the excystment of tintinnids from sediments. The total abundance of tintinnids excysting from sediments over five days increased with increasing concentrations of both phytoplankton species. This tendency was particularly notable for Eutintinnus tubulosus and Helicostomella longa. Concentrations ≥5.4 × 104 cells ml–1 of P. lutheri inhibited the excystment of Tintinnopsis beroidea. The optimum concentration of P. lutheri at which excystment of tintinnid species is enhanced is ≥1 × 104 cells ml–1, depending on the species of tintinnids.

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