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Testing the Sentinel Method: Live and Artificial Prey Display Contrasting Patterns of Predation Across an Urban

Yu Zeng1, Haolin Yang1, Yiheng Pan1

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Artificial prey underestimated predation intensity compared to live prey in urban environments. Live prey revealed distinct predator responses to urbanization, highlighting the need for careful prey selection in ecological studies.

Keywords:
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Area of Science:

  • Ecology
  • Urban Ecology
  • Predator-Prey Dynamics

Background:

  • Assessing biotic interactions across environmental gradients is crucial in ecology.
  • The sentinel method, using artificial or live prey, is common for studying predator-prey interactions.
  • Previous studies show mixed results on differences between artificial and live sentinel prey.

Purpose of the Study:

  • To compare predation intensity using artificial versus live prey along a natural-to-urban gradient.
  • To determine if prey type influences the assessment of predation along urbanization gradients.
  • To investigate how urbanization affects predation rates by different predator groups.

Main Methods:

  • An experiment was conducted at 10 sites across a natural-to-urban gradient in Suzhou, East China.
  • Artificial and live prey were released, either separately or combined, in a randomized sequence.
  • Predation intensity was measured by prey disappearance or evidence of predation.

Main Results:

  • Predation intensity increased with urbanization for both artificial and live prey.
  • Artificial prey showed lower predation rates than live prey and a different urbanization pattern.
  • Live prey predation rates varied by predator type: higher for avian predators and lower for insect predators with increasing urbanization.

Conclusions:

  • Artificial and live prey can yield divergent estimates of predation intensity.
  • Artificial prey may serve as a rapid screening tool, but live prey are preferable for comprehensive studies.
  • Prey type selection is critical for accurately assessing ecosystem services like predation.