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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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What is Natural Selection?01:32

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Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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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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Symbiosis00:58

Symbiosis

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Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
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Related Experiment Video

Updated: Mar 6, 2026

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
10:20

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Predator: non-predator ratios in beetle assemblages.

Kevin J Gaston1, Philip H Warren2, Peter M Hammond1

  • 1Department of Entomology, The Natural History Museum, Cromwell Road, SW7 5BD, London, UK.

Oecologia
|March 18, 2017
PubMed
Summary
This summary is machine-generated.

Terrestrial beetle assemblages show a consistent relationship between predatory and non-predatory species numbers. This pattern is influenced by factors beyond simple trophic interactions, with sampling methods and latitude playing key roles.

Keywords:
ColeopteraPredator-prey ratiosTrophic structure

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Area of Science:

  • Ecology
  • Community Ecology
  • Biodiversity Studies

Background:

  • Predator-prey dynamics are fundamental to community structure.
  • Previous studies show correlations between predatory and non-predatory species in various taxa.
  • The specific drivers of these relationships in terrestrial beetle assemblages require further investigation.

Purpose of the Study:

  • To investigate the relationship between predatory and non-predatory species numbers in terrestrial beetle assemblages.
  • To evaluate potential explanations for observed patterns, including trophic interactions, species pools, energetics, and non-trophic factors.
  • To identify factors causing deviations from the general pattern, such as sampling methods and geographic location.

Main Methods:

  • Statistical analysis of species counts from terrestrial beetle samples.
  • Logarithmic transformation to linearize the relationship between predatory and non-predatory species.
  • Comparison of patterns across different sampling methods and latitudinal gradients.

Main Results:

  • A significant positive correlation exists between predatory and non-predatory beetle species numbers.
  • Trophic interaction dynamics alone are insufficient to explain the observed proportionality.
  • Sampling method and latitude significantly influence the proportion of predatory species, with temperate and ground-trapped samples showing higher proportions.

Conclusions:

  • The proportionality between predatory and non-predatory species in beetle assemblages is robust.
  • Explanations involving local-regional species pools, energetics, or non-trophic factors are more plausible than simple trophic dynamics.
  • Sampling artifacts and latitudinal effects are critical considerations when interpreting beetle community structure data.