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Testing for context-dependence in a processing chain interaction among detritus-feeding aquatic insects.

Matthew P Daugherty1, Steven A Juliano

  • 1Behavior, Ecology, Evolution, and Systematics Section, Department of Biological Sciences, Illinois State University, U.S.A.

Ecological Entomology
|December 9, 2008
PubMed
Summary

Scirtid beetles provide minimal benefit to Ochlerotatus triseriatus mosquitoes by producing fine particles. The interaction

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Area of Science:

  • Ecology
  • Insect Ecology
  • Interspecies Interactions

Background:

  • Processing chains describe sequential resource use by different species.
  • Models predict interaction outcomes based on resource processing rates.
  • The scirtid beetle-Ochlerotatus triseriatus mosquito system exemplifies a processing chain.

Purpose of the Study:

  • To test if increased consumer-independent processing reduces scirtid beetle benefits to mosquitoes.
  • To investigate the impact of scirtid beetles on mosquito larvae.
  • To evaluate the accuracy of processing chain models in this system.

Main Methods:

  • Manipulated consumer-independent processing rates using different leaf species and crushing.
  • Quantified fine particle production by scirtid beetles.
  • Assessed the effects of scirtids on mosquito populations.

Main Results:

  • Scirtids increased fine particle production but had weak, non-dependent effects on mosquitoes.
  • A correlation between scirtid feeding and processing rate was observed.
  • Mosquitoes showed evidence of negatively impacting scirtid beetles.

Conclusions:

  • Processing chain models require refinement to accurately describe scirtid-O. triseriatus interactions.
  • Alternative interaction mechanisms beyond resource processing may be significant.
  • The predicted relationship between processing rate and interaction outcome was not strongly supported.