Bacterioplankton and Carbon Turnover in a Dense Macrophyte Canopy
Studies on cascading trophic interactions in lakes have shown that planktonic food web changes may take place to the level of protozoans (reviewed by Carpenter and Kitchell, 1993; Riemann and Christoffersen, 1993). It is more unclear if and how cascading might influence bacterioplankton (Jeppesen et al., 1992; Christoffersen et al, 1993; Pace, 1993). From studies in oligo-mesotrophic temperate lakes, Pace (1993) concluded “that bacteria responded to changes in phytoplankton and increases in nutrients, but not to changes in Zooplankton.“ More generally, it was suggested that “trophic cascades do not have immediately obvious consequences for microbial processes in lakes” (Kitchell and Carpenter, 1993). In accordance, Jeppesen et al. (1992) found that a trophic cascade with high grazing by clado-cerans and a four- to sixfold reduction in phytoplankton biomass only slightly altered bacterioplankton production in two fish-manipulated shallow and eu-trophic Danish lakes.
KeywordsOrbital Period Radial Velocity Trophic Cascade Common Envelope Radial Velocity Data
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