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Intra‐guild predation (IGP) can increase or decrease prey density depending on the strength of IGP by Feng‐Hsun Chang; Bradley J. Cardinale is a Environmental Science article available to read on EtoBox.

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## Abstract In consumer communities, intra‐guild predation (IGP) is a commonly observed interaction that is widely believed to increase resource density. However, some recent theoretical work predicts that resource density should first decrease, and then increase as the strength of IGP increases. This occurs because weak to intermediate IGP increases the IG predator density more than it reduces the IG prey density, so that weak to intermediate IGP leads to the lowest resource density compared to weak or strong IGP. We test this prediction that basal resource density would first decrease and then increase as the strength of IGP increase. We used a well‐studied system with two protozoa species engaged in IGP and three bacteria species as the basal resources. We experimentally manipulated the percentage of the IG prey population that was available to an IG predator as a proxy for IGP strength. We found that bacterial density first decreased (by ~25%) and then increased (by ~30%) as the strength of IGP increased. Using a modified version of a published IGP model, we were able to explain ~70% of the variation in protozoa and bacterial density. Agreement of the empirical results with mod

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Author

Feng‐Hsun Chang; Bradley J. Cardinale

Publisher

Ecological Society of America; Wiley (John Wiley & Sons); Wiley-Blackwell; Wiley (ISSN 0012-9658)

Published

2020

Language

EN

Field

Environmental Science (Physical Sciences)