Availability of Prey Resources Drives Evolution of Predator-prey Interaction

Overview

Journal Proc Biol Sci

Specialty Biology

Date 2008 Apr 24

PMID 18430643

Citations 30

Authors

Ville-Petri Friman

Teppo Hiltunen

Jouni Laakso

Veijo Kaitala

Affiliations

Soon will be listed here.

Abstract

Productivity is predicted to drive the ecological and evolutionary dynamics of predator-prey interaction through changes in resource allocation between different traits. Here we report results of an evolutionary experiment where prey bacteria Serratia marcescens was exposed to predatory protozoa Tetrahymena thermophila in low- and high-resource environments for approximately 2400 prey generations. Predation generally increased prey allocation to defence and caused prey selection lines to become more diverse. On average, prey became most defensive in the high-resource environment and suffered from reduced resource use ability more in the low-resource environment. As a result, the evolution of stronger prey defence in the high-resource environment led to a strong decrease in predator-to-prey ratio. Predation increased temporal variability of populations and traits of prey. However, this destabilizing effect was less pronounced in the high-resource environment. Our results demonstrate that prey resource availability can shape the trade-off allocation of prey traits, which in turn affects multiple properties of the evolving predator-prey system.

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