Negative consequences of glacial turbidity for the survival of freshwater planktonic heterotrophic flagellates.

ABSTRACT: Heterotrophic (phagotrophic) flagellates are key components of planktonic food webs in freshwater and marine ecosystems because they are the main consumers of bacteria. Although they are ubiquitous in aquatic ecosystems, they were numerically undetectable in turbid glacier-fed lakes. Here we show that glacial particles had negative effects on the survival and growth of heterotrophic flagellates. The effect of glacial particles was concentration-dependent and was caused by their interference with bacterial uptake rather than by physical damage. These results are the first to reveal why establishment of heterotrophic flagellates populations is hindered in very turbid glacial lakes. Because glaciers are vanishing around the world, recently formed turbid meltwater lakes represent an excellent

SUBMITTER: Sommaruga R 

PROVIDER: S-EPMC3925964 | biostudies-literature | 2014 Feb

REPOSITORIES: biostudies-literature