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Selective predation and productivity jointly drive complex behavior in host-parasite systems.

Spencer R Hall1, Meghan A Duffy, Carla E Cáceres

  • 1School of Integrative Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA. srhall@uiuc.edu

The American Naturalist
|March 4, 2005
PubMed
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Predators significantly influence parasite spread. Ecosystem productivity and predator foraging behavior, including selectivity, can lead to parasite extinction or complex host-parasite dynamics, impacting invasion success.

Area of Science:

  • Ecology
  • Epidemiology
  • Mathematical Biology

Background:

  • Host-parasite dynamics are influenced by community interactions, particularly predation.
  • The interplay of predator density, foraging behavior, and ecosystem productivity on these dynamics is not fully understood.

Purpose of the Study:

  • To investigate how ecosystem productivity modulates host-parasite dynamics influenced by predator foraging behavior.
  • To explore the impact of predator selectivity and density on parasite invasion and persistence.

Main Methods:

  • Modification of a standard susceptible-infected model.
  • Analysis of predator foraging behavior (saturating and selective) and ecosystem productivity.
  • Mathematical modeling of host-parasite systems with predator interactions.

Related Experiment Videos

Main Results:

  • Predator preference for infected hosts can cause oscillations, alternative stable states, Allee effects, and parasite extinction.
  • Intermediate predator selectivity can shift systems between stable and oscillating states.
  • High productivity with neutral or avoiding predators can lead to host and parasite extinction.

Conclusions:

  • Ecosystem context, including productivity and predator behavior, is crucial for host-parasite interactions.
  • Predator foraging strategies can dramatically alter parasite invasion success and population dynamics.
  • Synergistic effects between predators and parasites can have severe consequences for host populations.