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Related Concept Videos

Predator-Prey Interactions02:39

Predator-Prey Interactions

Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.Although predation is commonly associated with carnivory, for...
Microbial Interactions: Predation01:28

Microbial Interactions: Predation

Microbial predation refers to the process by which one microorganism kills and consumes another to obtain nutrients and energy. It encompasses both bacterial and protozoan predators. This interaction plays a crucial role in shaping microbial communities and regulating nutrient cycling.Bacterial Predators: Epibiotic vs. EndobioticBacterial predators are classified based on their mode of attack as either epibiotic or endobiotic. Epibiotic predators, such as Vampirococcus, attach to the surface of...
Competition02:34

Competition

When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.Intraspecific competition, which occurs between individuals of the same species, serves as a natural mechanism for regulating population size. Too much...
Optimal Foraging00:48

Optimal Foraging

How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
Ecological Niches02:02

Ecological Niches

All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.Multiple species cannot occupy the exact same niche within their habitat. If the niches of two or more species overlap to a large extent, the competitive exclusion principle dictates that one species will outcompete the other, forcing it to...
Keystone Species01:39

Keystone Species

Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a pivotal role in the...

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A predator-prey refuge system: Evolutionary stability in ecological systems.

Ross Cressman1, József Garay

  • 1Department of Mathematics, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada. rcressman@wlu.ca

Theoretical Population Biology
|September 16, 2009
PubMed
Summary

Predator-prey models show that refuges and apparent competition can destabilize evolutionarily stable strategies when prey species interact. This challenges previous assumptions about ecological stability in evolutionary game theory.

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Area of Science:

  • Evolutionary Ecology
  • Game Theory
  • Population Dynamics

Background:

  • Predator-prey interactions are fundamental to ecosystem stability.
  • Refuge use and apparent competition are key ecological factors influencing these dynamics.
  • Evolutionarily stable strategies (ESS) describe stable ecological systems where mutant genotypes cannot invade.

Purpose of the Study:

  • To develop a refuge model for predator-prey systems with one or two prey species.
  • To investigate the evolutionary stability of ecological systems under different refuge and competition scenarios.
  • To explore the combined effects of apparent competition and refuge use on evolutionary stability.

Main Methods:

  • Development of a mathematical model for predator-prey dynamics.
  • Analysis of individual fitness based on strategy choice (ecotype) and population sizes.
  • Application of game-theoretic principles to determine ecological and evolutionary stability.
  • Comparison of stability conditions with and without prey refuges.

Main Results:

  • Stable monomorphic resident systems (Nash equilibria) are ecologically and evolutionarily stable when prey species compete indirectly without refuges.
  • The introduction of refuges for two indirectly competing prey species can destabilize these previously stable systems.
  • Individually stabilizing factors (refuge use, apparent competition) can have a combined destabilizing evolutionary effect.

Conclusions:

  • Refuge use in multi-prey systems can disrupt evolutionary stability, even when apparent competition is present.
  • The study generalizes the concept of evolutionarily stable strategies to complex ecological models.
  • Theoretical insights into predator-prey dynamics and evolutionary stability are provided, with implications for understanding biological examples.