Abstract
Predation on bacteria is now considered as an essential component of aquatic and terrestrial food webs, with important implications for many ecosystem processes. Studies in recent years have also focused on the mechanisms of predation and its implications for the structure of bacterial communities. This chapter gives an overview on predation on free-living bacteria by the major predator groups encountered in aquatic systems: bacteriophages, predatory prokaryotes, protists and metazoans. Quantitative as well as qualitative predation impacts on bacterial communities by the different predators, as derived from field studies and laboratory experiments, are summarized. The different predator types encompass several orders of magnitude in size and differ with respect to foraging strategy, consumption rates and selectivity. Bacteria have evolved various strategies to reduce predatory mortality. These have been studied most extensively with respect to protist predation and encompass behavioural, morphological and physiological adaptations, which act at different stages of the predator–prey interactions between bacteria and bacterivores. Field studies and food web manipulation experiments in pelagic systems have also demonstrated the relevance of predation for the taxonomic and morphological composition of natural bacterial assemblages. Compared to bacterivorous protists, much less is known about the predation impact of the smallest, parasitoid-like predators such as bacteriophages and prokaryotic predators (e.g. Bdellovibrio) and the resulting anti-predator strategies of bacteria.
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Jürgens, K. (2006). Predation on Bacteria and Bacterial Resistance Mechanisms: Comparative Aspects Among Different Predator Groups in Aquatic Systems. In: Jurkevitch, E. (eds) Predatory Prokaryotes. Microbiology Monographs, vol 4. Springer, Berlin, Heidelberg . https://doi.org/10.1007/7171_053
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DOI: https://doi.org/10.1007/7171_053
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