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Complex Daphnia interactions with parasites and competitors.

C E Cáceres1, G Davis2, S Duple1

  • 1School of Integrative Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States.

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|December 3, 2014
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Summary

Diluter species can reduce disease in focal hosts but may also compete for resources. This competition can undermine dilution benefits, leading to complex dynamics and potentially reducing focal host populations.

Keywords:
Bifurcation theoryDaphniaEndemic equilibriaEpidemic modelHolling modelResource competition

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Area of Science:

  • Ecology
  • Epidemiology
  • Mathematical Biology

Background:

  • Species interactions significantly impact epidemic dynamics in focal host populations.
  • The dilution effect, where non-host species reduce parasite transmission, is a key ecological interaction.
  • Competition for shared resources between diluter and focal host species can complicate disease dilution benefits.

Purpose of the Study:

  • To model the combined effects of dilution and competition on host-parasite-resource dynamics.
  • To investigate how these interactions influence disease prevalence and population stability.
  • To understand the conditions under which dilution benefits outweigh competition costs for focal hosts.

Main Methods:

  • Development of a mathematical model incorporating four species: focal host, diluter host, parasite, and resource.
  • Analysis of model dynamics, including equilibrium states, stability, and bifurcation analysis.
  • Parameterization based on a plankton system example (zooplankton hosts, fungal parasite, algal resources).

Main Results:

  • Superior competitor diluters can drive focal hosts to extinction, irrespective of parasitism.
  • Inferior competitor diluters can reduce disease prevalence but may also lower focal host densities due to competition.
  • Dilution effects can destabilize host-resource dynamics, and complex dynamics (bifurcations) arise in the four-species system.
  • The net effect of diluters depends on resource carrying capacity, with competition dominating at higher levels.

Conclusions:

  • Dilution and competition create complex ecological trade-offs that can counteract disease control benefits.
  • Disease dilution strategies must carefully consider interspecific competition dynamics.
  • Resource availability critically influences the balance between dilution benefits and competitive costs for focal hosts.