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. 2022 Aug 23;12(8):e9207.
doi: 10.1002/ece3.9207. eCollection 2022 Aug.

Prey identity affects fitness of a generalist consumer in a brown food web

Lily Khadempour  1   2 , Leslie Rivas Quijano  1 , Casey P terHorst  1
Affiliations

Prey identity affects fitness of a generalist consumer in a brown food web

Lily Khadempour et al. Ecol Evol. .

Abstract

The use of ever-advancing sequencing technologies has revealed incredible biodiversity at the microbial scale, and yet we know little about the ecological interactions in these communities. For example, in the phytotelmic community found in the purple pitcher plant, Sarracenia purpurea, ecologists typically consider the bacteria as a functionally homogenous group. In this food web, bacteria decompose detritus and are consumed by protozoa that are considered generalist consumers. Here, we tested whether a generalist consumer benefits from all bacteria equally. We isolated and identified 22 strains of bacteria, belonging to six genera, from S. purpurea plants. We grew the protozoa, Tetrahymena sp. with single isolates and strain mixtures of bacteria and measured Tetrahymena fitness. We found that different bacterial strains had different effects on protozoan fitness, both in isolation and in mixture. Our results demonstrate that not accounting for the composition of prey communities may affect the predicted outcome of predator-prey interactions.

Keywords: Sarracenia purpurea; bottom‐up effects; phytotelmic; predator–prey dynamics.

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Figures

FIGURE 1
FIGURE 1
Protist abundance depends on the identity of bacterial strain (F [21,153] = 14.23, p < .001). Box plot definitions: Center line—median, upper, and lower box limits—upper and lower quartiles, whiskers—1.5× inter‐quartile range, outliers—any points outside the 1.5× inter‐quartile range
FIGURE 2
FIGURE 2
Protist abundance varies depending on a mixture of strains (F [4,34] = 29.46, p < .001). Any strain combination that contained harmful strains of Chromobacterium resulted in poor protozoan growth. Box plot definitions: Center line—median, upper, and lower box limits—upper and lower quartiles, whiskers—1.5× inter‐quartile range, outliers—any points outside the 1.5× inter‐quartile range
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