Abstract
We evaluated the relative importance of bottom-up and top-down mechanisms in controlling the density of a heterotrophic nanoflagellate (HNF) community in a shallow lake (Guarana Lake) on the Parana River floodplain (State of Mato Grosso do Sul, Brazil). Samples were taken monthly from March 2007 through February 2008, in three strata (surface, middle and bottom). Bacterial and cladoceran densities were the variables most associated with HNF density. However, there was a gradual decoupling between HNF and bacteria from the subsurface to the bottom of the lake. Most likely, this was caused by high predation by cladocerans on HNF in the deeper layer. Our results suggest that the overwhelming dominance of a single type of control on HNF dynamics may be more the exception than the rule.
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