Exclusive juvenile predator resource promotes coexistence in a size-structured intraguild predation system
(English)Manuscript (preprint) (Other academic)
Coexistence in size-structured intraguild predation systems is limited, and is predicted to occur when the IG predator exhibits a complete ontogenetic niche shift, has a similar asymptotic size as the IG prey, or has access to an exclusive resource. Here we experimentally test the effect of a juvenile IG predator exclusive resource by mimicking an ontogenetic habitat shift in the IG predator that switched either to a more or a less productive habitat at maturity. We show that coexistence depends on relative habitat productivities when refuges are present and cannibalism in the IG predator is low, but does not so when refuges are absent and cannibalism in the IG predator is substantial. Overall compared to previous experimental studies without an ontogenetic habitat shift, we how that an exclusive resource for juvenile IG predators promotes coexistence with context-dependent differences in the manifestation of this effect.
population regulation, interaction strength, cannibalism, habitat complexity, life-history-omnivory, habitat productivity, ontogenetic habitat shift
IdentifiersURN: urn:nbn:se:umu:diva-107025OAI: oai:DiVA.org:umu-107025DiVA: diva2:846478