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Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
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Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

Published on: March 12, 2013

Trophic cascades across ecosystems.

Tiffany M Knight1, Michael W McCoy, Jonathan M Chase

  • 1Department of Zoology, University of Florida, Gainesville, Florida 32611, USA. tknight@biology2.wustl.edu

Nature
|October 7, 2005
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Summary
This summary is machine-generated.

Predatory fish in ponds reduce dragonfly larvae, leading to more adult dragonflies that boost terrestrial plant reproduction by increasing pollinator visits. This highlights cross-ecosystem trophic cascades.

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Area of Science:

  • Ecology
  • Food web dynamics
  • Ecosystem interactions

Background:

  • Predation significantly impacts food webs through direct and indirect effects.
  • Organismal fluxes across ecosystem boundaries are crucial for community dynamics.
  • Complex life cycle species act as conduits, coupling different ecosystems.

Purpose of the Study:

  • To investigate how fish predation in aquatic ecosystems influences terrestrial plant reproduction.
  • To elucidate the cascading trophic interactions across ecosystem boundaries.
  • To understand the role of species with complex life histories in linking habitats.

Main Methods:

  • Field observations and experimental manipulations in pond ecosystems.
  • Quantification of larval dragonfly abundance in relation to fish presence.
  • Assessment of adult dragonfly foraging behavior and pollinator visitation rates to nearby plants.
  • Measurement of plant pollen limitation.

Main Results:

  • Fish presence significantly reduced larval dragonfly populations in ponds.
  • Lower larval dragonfly numbers resulted in fewer adult dragonflies in adjacent terrestrial areas.
  • Terrestrial plants near fish-containing ponds received more pollinator visits and exhibited less pollen limitation.
  • Adult dragonflies altered their foraging behavior in response to predator cues.

Conclusions:

  • Cross-ecosystem trophic cascades, initiated by fish predation, can enhance terrestrial plant reproduction.
  • Species with complex life histories play a vital role in mediating ecological effects between aquatic and terrestrial environments.
  • Landscape-level ecological processes are critical drivers of local community interactions and ecosystem functioning.