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Ecosystems

, Volume 8, Issue 6, pp 682–693 | Cite as

Effects of Multi-chain Omnivory on the Strength of Trophic Control in Lakes

  • Yvonne VadeboncoeurEmail author
  • Kevin S. McCann
  • M. Jake Vander Zanden
  • Joseph B. Rasmussen
Article

Abstract

Omnivory has been implicated in both diffusing and intensifying the effects of consumer control in food chains. Some have postulated that the strong, community level, top-down control apparent in lakes is not expressed in terrestrial systems because terrestrial food webs are reticulate, with high degrees of omnivory and diverse plant communities. In contrast, lake food webs are depicted as simple linear chains based on phytoplankton-derived energy. Here, we explore the dynamic implications of recent evidence showing that attached algal (periphyton) carbon contributes substantially to lake primary and secondary productivity, including fish production. Periphyton production represents a cryptic energy source in oligotrophic and mesotrophic lakes that is overlooked by previous theoretical treatment of trophic control in lakes. Literature data demonstrate that many fish are multi-chain omnivores, exploiting food chains based on both littoral and pelagic primary producers. Using consumer-resource models, we examine how multiple food chains affect fourth-level trophic control across nutrient gradients in lakes. The models predict that the stabilizing effects of linked food chains are strongest in lakes where both phytoplankton and periphyton contribute substantially to production of higher trophic levels. This stabilization enables a strong and persistent top down control on the pelagic food chain in mesotrophic lakes. The extension of classical trophic cascade theory to incorporate more complex food web structures driven by multi-chain predators provides a conceptual framework for analysis of reticulate food webs in ecosystems.

Keywords

top down control omnivory littoral-pelagic coupling consumer-resource models trophic cascades food webs 

Notes

Acknowledgements

We thank Erik Jeppesen and 2 anonymous reviewers for comments on early versions of this manuscript. YV was supported by a GRIL post-doctoral fellowship at McGill University.

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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Yvonne Vadeboncoeur
    • 1
    • 3
    Email author
  • Kevin S. McCann
    • 1
    • 4
  • M. Jake Vander Zanden
    • 2
  • Joseph B. Rasmussen
    • 1
    • 5
  1. 1.Biology DepartmentMcGill UniversityMontrealCanada
  2. 2.Center for LimnologyUniversity of WisconsinMadisonUSA
  3. 3.Department of Biological SciencesWright State UniversityDaytonUSA
  4. 4.Zoology DepartmentUniversity of GuelphGuelphCanada
  5. 5.Department of Biological SciencesUniversity of LethbridgeLethbridgeCanada

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