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Pulsed removals of individuals from a population lead to lower equilibrium sizes compared to continuous removals. These effects are most pronounced with infrequent, large pulses, especially at low population growth rates.

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Area of Science:

  • Ecology
  • Population Dynamics
  • Mathematical Biology

Background:

  • Resource pulses significantly impact population dynamics, but pulsed top-down factors remain less understood.
  • Continuous versus pulsed inputs have different ecological consequences.

Purpose of the Study:

  • To investigate how pulsed removals of individuals affect population size compared to continuous removals.
  • To analyze the influence of removal pulse characteristics (frequency, magnitude, timing) on population dynamics.

Main Methods:

  • Utilized a simple differential equation population model.
  • Simulated pulsed and continuous removal scenarios.
  • Analyzed population equilibrium sizes and eradication dynamics.

Main Results:

  • Pulsed removals consistently resulted in lower equilibrium population sizes than continuous removals.
  • The difference between pulsed and continuous removals was largest at low population growth rates and high removal rates.
  • Large, infrequent pulses caused the greatest reduction in equilibrium population size.
  • Cyclic removal timing was less likely to lead to eradication than stochastic timing, but eradication occurred faster when it did.

Conclusions:

  • Pulsed removals have distinct and significant effects on population dynamics compared to continuous removals.
  • The characteristics of pulsed removals, including their timing, critically influence population size and eradication probability.
  • Understanding pulsed removals is crucial for effective ecological management and conservation strategies.