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Related Concept Videos

Natural Selection and Mating Preferences01:06

Natural Selection and Mating Preferences

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The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
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Types of Selection01:46

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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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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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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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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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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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Detecting the ecological footprint of selection.

Juliette Luiselli1,2,3, Isaac Overcast4,5, Andrew Rominger5,6

  • 1Département de Biologie, École Normale Supérieure-PSL, Paris, France.

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|June 7, 2024
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Summary

New competition models reveal ecological selection forces shaping biodiversity, challenging previous assumptions of neutral processes. Advanced data and modeling are key to understanding community assembly.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Biodiversity Science

Background:

  • Community structure is shaped by ecological and evolutionary processes, but distinguishing these from neutral processes is challenging.
  • Classic biodiversity patterns often obscure the underlying mechanisms driving community assembly.

Purpose of the Study:

  • To differentiate ecological selection (competition, environmental filtering) from neutral processes in community assembly.
  • To develop and implement a more realistic pairwise competition model for detecting selective forces.

Main Methods:

  • Utilized Massive Eco-evolutionary Synthesis Simulations (MESS) incorporating species abundances, genetic diversity, and trait variation.
  • Introduced a novel pairwise individual-trait comparison for competition, distinct from community-mean-based approaches.
  • Applied advanced mechanistic models and inference techniques to empirical data.

Main Results:

  • The new pairwise competition model is more readily identifiable in empirical data than previous methods, especially with trait data.
  • Findings suggest that some biodiversity patterns attributed to neutrality may result from pairwise selective forces.
  • Qualitatively different results compared to models using community-mean trait distances.

Conclusions:

  • Advanced mechanistic models and diverse data types are crucial for understanding community assembly.
  • Re-evaluation of empirical data may be needed, as signatures previously attributed to neutrality could be due to pairwise selection.
  • The relative importance of neutral versus selective processes in community assembly requires further investigation.