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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...
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Limits to Natural Selection

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.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
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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...
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

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).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
What is Natural Selection?01:32

What is Natural Selection?

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.The Theory of Natural...
Trophic Levels01:35

Trophic Levels

All organisms in an ecosystem occupy a trophic level in the food chain. The lowest level consists of primary producers, which synthesize their food from either solar or chemical energy. Each subsequent level obtains energy from the levels below. Detritivores can occupy any of the levels above primary producers.

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Correction: Pertegal et al. More Than 200 Years Later: <i>Gluvia brunnea</i> sp. nov. (Solifugae, Daesiidae), a Second Species of Camel Spider from the Iberian Peninsula. <i>Insects</i> 2024, <i>15</i>, 284.

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Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
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Published on: March 12, 2013

Genetic variation, predator-prey interactions and food web structure.

Jordi Moya-Laraño1

  • 1Cantabrian Institute of Biodiversity (ICAB), Universidad de Oviedo-Principado de Asturias, 33006 Oviedo, Asturias, Spain. jordi@eeza.csic.es

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|March 30, 2011
PubMed
Summary

Within-population variation in traits like growth and timing can enhance food web stability and persistence. Preserving genetic diversity within species is crucial for maintaining entire ecological communities.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Theoretical Ecology

Background:

  • Food webs illustrate species interactions, but the impact of within-population variation remains understudied.
  • Understanding how individual differences influence ecosystem structure is key to predicting community stability.

Purpose of the Study:

  • To investigate the effects of within-population phenotypic and genetic variation on food web structure and persistence.
  • To explore how variation in traits like growth rates and phenology influences ecological network parameters.

Main Methods:

  • Simulations were used to model the impact of trait variation on food web dynamics.
  • Key traits analyzed included growth rates and phenology, affecting body size variability over time.

Main Results:

  • Variation in growth and phenology can increase food web connectance and omnivory.
  • It also leads to decreased interaction strengths and increased variation among interaction strengths.
  • These effects collectively enhance food web persistence and stability.

Conclusions:

  • Within-population trait variation plays a significant role in shaping food web structure and promoting stability.
  • Preserving genetic variation within populations is vital for conserving ecological communities and their functions.
  • Future research should focus on empirically linking within-population variation to food web dynamics.