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 (Guaraná Lake) on the Paraná 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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Acknowledgments
We thank V. F. Farjalla, S. Jati, Janet W. Reid, and two anonymous reviewers for fruitful comments on an earlier version of the manuscript. The authors also thank the post-graduate course in Ecology of Continental Aquatic Habitats (PEA, Maringá State University) and NUPELIA for financial support, material, equipment and facilities during the sampling. This study was supported by the Brazilian Research Council (CNPq) and the Brazilian Federal Agency for the Support and Evaluation of Graduate Education (CAPES).
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Segovia, B.T., Pereira, D.G., Bini, L.M. et al. Effects of bottom-up and top-down controls on the temporal distribution of planktonic heterotrophic nanoflagellates are dependent on water depth. Hydrobiologia 736, 155–164 (2014). https://doi.org/10.1007/s10750-014-1904-7
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DOI: https://doi.org/10.1007/s10750-014-1904-7