Living in the city: Resource availability, predation, and bird population dynamics in urban areas

John Anderies, Madhusudan Katti, Eyal Shochat

Research output: Contribution to journalArticlepeer-review

85 Scopus citations

Abstract

This article explores factors that shape population structure in novel environments that have received scant theoretical attention: cities. Urban bird populations exhibit higher densities and lower diversity. Some work suggests this may result from lower predation pressure and more predictable and abundant resources. These factors may lead to populations with few winners and many losers regarding access to food, body condition, and reproductive success. We explore these hypotheses with an individual-energy-based competition model with two phenotypes of differing foraging ability. We show that low frequency resource fluctuations favor strong competitors and vice versa. We show that low predation skews equilibrium populations in favor of weak competitors and vice versa. Increasing the time between resource pulses can thus shift population structure from weak to strong competitor dominance. Given recent evidence for more constant resource input and lower predation in urban areas, the model helps understand observed urban bird population structure.

Original languageEnglish (US)
Pages (from-to)36-49
Number of pages14
JournalJournal of Theoretical Biology
Volume247
Issue number1
DOIs
StatePublished - Jul 7 2007

Keywords

  • Birds
  • Population dynamics
  • Predation
  • Resource dynamics
  • Urban

ASJC Scopus subject areas

  • Statistics and Probability
  • Modeling and Simulation
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Agricultural and Biological Sciences(all)
  • Applied Mathematics

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