Fig 6.

Time course of the density of microbes and their rates of removal from the overflow trough water by H. schlegeli clams. The rate of microbe removal (as a percentage) was calculated as described in the text. Means and standard deviations are shown based on results from five replicates. The absence of bars indicates that the error was smaller than the symbol. (A) Heterochromulina sp. (class Phytomastigophora); (B) Gymnamoebia sp. (class Lobesea); (C) Testacealobosia sp. (class Lobesea); (D) Vorticella sp. (class Ciliatea). ▨, density of microbes with clams present; □, density of microbes without clam present (control); ●, rate of microbe removal by the clams.