When is overkill optimal? Tritrophic interactions reveal new insights into venom evolution

Gangur, Alex N., Seymour, Jamie E., Liddell, Michael J., Wilson, David, Smout, Michael J., and Northfield, Tobin D. (2018) When is overkill optimal? Tritrophic interactions reveal new insights into venom evolution. Theoretical Ecology, 11 (2). pp. 141-149.

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Organisms embedded within food webs must balance arms races with their predators and prey. For venom users, venom may mediate each arms race, but the dynamical evolutionary changes in venom production in response to the two arms races are still poorly understood. Here, we use a simple model to evaluate the evolutionary response of a venomous consumer to the presence of an apex generalist predator and evolution of the consumer's prey. We find that introduction of the apex predator can weaken the arms race between the two lower trophic levels. In addition, when consumer prey capture and predator defense venoms functionally overlap, a reduced evolutionary response in the prey population can drive investment in venom used for prey capture going beyond what is optimal for subduing prey. These dynamics suggest that interactions with multiple trophic levels can substantially alter the venom complexity in predatory venomous animals and may explain the paradox of the overkill hypothesis.

Item ID: 51770
Item Type: Article (Research - C1)
ISSN: 1874-1746
Keywords: predator; prey; coevolution; food web; arms race
Date Deposited: 15 Dec 2017 01:13
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310302 Community ecology (excl. invasive species ecology) @ 60%
31 BIOLOGICAL SCIENCES > 3104 Evolutionary biology > 310403 Biological adaptation @ 40%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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