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Invasion Dynamics in an Intraguild Predation System with Predator-Induced Defense.

M C Köhnke1

  • 1Institute of Environmental Systems Research, School of Mathematics/Computer Science, Osnabrück University, Barbarastraße 12, 49076, Osnabrück, Germany. merlin.koehnke@uos.de.

Bulletin of Mathematical Biology
|August 22, 2019
PubMed
Summary
This summary is machine-generated.

Adaptive defense mechanisms in intraguild predation systems can promote predator coexistence. However, local adaptation may lead to transient global maladaptation, impacting invasion dynamics.

Keywords:
AdaptivityFitnessIntraguild predationInvasionReactivity–accuracy trade-offState-dependent diffusion

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Area of Science:

  • Ecology
  • Theoretical Ecology
  • Mathematical Biology

Background:

  • Intraguild predation systems, where predators consume prey that also competes for resources, are common in food webs.
  • Classical models (Holling type II) fail to predict predator coexistence in resource-rich environments.
  • Previous models often used artificial bounding terms to achieve coexistence.

Purpose of the Study:

  • To investigate how adaptive predator-induced and fitness-dependent defense mechanisms influence predator coexistence.
  • To explore coexistence without relying on artificial bounding terms.
  • To analyze the impact of adaptivity on invasion dynamics.

Main Methods:

  • Incorporation of adaptive defense mechanisms into an intraguild predation model.
  • Utilizing numerical bifurcation software to analyze parameter spaces for coexistence.
  • Distinguishing between two adaptation parameters under varying environmental conditions.
  • Examining the effect of adaptivity on dispersal and invasion waves in a 1D domain.

Main Results:

  • Adaptive defense significantly expands parameter ranges that allow for predator coexistence.
  • The reactivity-accuracy trade-off in adaptation is environment-dependent.
  • Adaptivity's impact on dispersal alters the speed and shape of invasion waves.
  • A system that is locally adaptive can exhibit transient global maladaptation.

Conclusions:

  • Adaptive defense is a crucial factor for predator coexistence in intraguild systems.
  • Environmental conditions dictate the nature of adaptive trade-offs.
  • Understanding adaptivity's role in dispersal is key for predicting biological invasion patterns.
  • Local adaptation does not guarantee global stability, especially in transient dynamics.