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Mixotrophy and intraguild predation – dynamic consequences of shifts between food web motifs

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Abstract

Mixotrophy is ubiquitous in microbial communities of aquatic systems with many flagellates being able to use autotroph as well as heterotroph pathways for energy acquisition. The usage of one over the other pathway is associated with resource availability and the coupling of alternative pathways has strong implications for system stability. We investigated the impact of dominance of different energy pathways related to relative resource availability on system dynamics in the setting of a tritrophic food web motif. This motif consists of a mixotroph feeding on a purely autotroph species while competing for a shared resource. In addition, the autotroph can use an additional exclusive food source. By changing the relative abundance of shared vs. exclusive food source, we shift the food web motif from an intraguild predation motif to a food chain motif. We analyzed the dependence of system dynamics on absolute and relative resource availability. In general, the system exhibits a transition from stable to oscillatory dynamics with increasing nutrient availability. However, this transition occurs at a much lower nutrient level for the food chain in comparison to the intraguild predation motif. A similar transition is also observed with variations in the relative abundance of food sources for a range of nutrient levels. We expect this shift in food web motifs to occur frequently in microbial communities and therefore the results from our study are highly relevant for natural systems.

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Authors and Affiliations

  1. Leibniz – Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587, Berlin, Germany

    Rajat Karnatak & Sabine Wollrab

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  1. Rajat Karnatak
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  2. Sabine Wollrab
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Correspondence to Rajat Karnatak or Sabine Wollrab.

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Karnatak, R., Wollrab, S. Mixotrophy and intraguild predation – dynamic consequences of shifts between food web motifs. Eur. Phys. J. Spec. Top. 226, 2135–2144 (2017). https://doi.org/10.1140/epjst/e2017-70033-5

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  • DOI: https://doi.org/10.1140/epjst/e2017-70033-5

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