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Related Concept Videos

Predator-Prey Interactions02:39

Predator-Prey Interactions

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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.
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Competition02:34

Competition

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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.
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Optimal Foraging00:48

Optimal Foraging

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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.
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Types of Selection01:46

Types of Selection

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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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Frequency-dependent Selection01:21

Frequency-dependent Selection

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Limits to Natural Selection01:38

Limits to Natural Selection

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Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
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A Real-Time Interactive System for Studying Confrontational Pursuit Behavior in Rodents
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Theoretical dynamics of competitors under predation.

I Noy-Meir1

  • 1Department of Botany, Institute of Life Sciences, Hebrew University, Jerusalem, Israel.

Oecologia
|March 18, 2017
PubMed
Summary

Predator-prey models reveal complex population dynamics influenced by prey competition and predator behavior. These models explain diverse community outcomes, including coexistence and keystone species effects.

Area of Science:

  • Ecology
  • Population Dynamics
  • Theoretical Biology

Background:

  • Understanding predator-prey interactions is crucial for predicting ecological community structures.
  • Previous models often simplified predator behavior and prey competition, limiting their explanatory power.

Purpose of the Study:

  • To explore continuous population models of two prey species and a predator.
  • To investigate how predator satiation, prey substitution, and competition influence community dynamics.

Main Methods:

  • Utilized isocline analysis to examine population models.
  • Incorporated predator satiation and prey substitution (with and without switching) into the models.
  • Analyzed the impact of prey competitive relations and predator feeding behavior.

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Main Results:

  • Introduced predator satiation and substitution lead to diverse dynamic behaviors.
  • Found complex, predictable dependencies on prey competition and predator efficiency.
  • Demonstrated that seemingly contradictory community phenomena (e.g., coexistence vs. exclusion) can arise as special cases.

Conclusions:

  • Predator-prey models can explain a wide range of ecological community outcomes.
  • Prey tolerant to predation can function as keystone species, impacting other prey positively or negatively.
  • Predator-induced mutualism between prey species is theoretically possible under specific conditions.