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Related Concept Videos

What is Natural Selection?01:32

What is Natural Selection?

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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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Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
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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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Natural selection, a fundamental concept in evolutionary biology, is the mechanism by which evolution is driven, favoring organisms that are best adapted to their environments. This process enhances their chances of survival and reproduction. Adaptation, a key outcome of this process, involves genetic modifications that optimize an organism's functionality under specific environmental challenges, such as extreme cold or thinner air at high altitudes.
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Individual and Population Differences Shape Species Interactions and Natural Selection.

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    Intraspecific trait variation significantly impacts species interactions and natural selection. Differences within and among populations of gall-forming insects altered enemy attack rates and selection patterns.

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    Area of Science:

    • Community Ecology
    • Evolutionary Biology
    • Behavioral Ecology

    Background:

    • Trait variation within species is crucial for understanding species interactions and community dynamics.
    • Intraspecific variation, both among and within populations, can influence ecological processes at various scales.

    Purpose of the Study:

    • To investigate how within- and among-population intraspecific variation affects species interactions and phenotypic selection.
    • To determine if intraspecific variation alters trait-function relationships and community-level patterns.

    Main Methods:

    • Manipulation of within- and among-population intraspecific variation in wild gall-forming insects.
    • Quantification of species interactions, specifically attack rates by an enemy community.
    • Assessment of phenotypic selection acting on trait variation.

    Main Results:

    • Gall size variation, influenced by both within- and among-population differences, interacted to affect enemy attack rates.
    • Among-population differences in trait variation had a more substantial impact on species interactions than within-population differences.
    • Intraspecific variation influenced species interactions by shifting population positions on trait-function maps and altering trait-function relationships.

    Conclusions:

    • Intraspecific trait variation is a key driver of species interactions and community structure.
    • Differences among populations are particularly important in shaping ecological interactions and natural selection.
    • Intraspecific variation impacts communities and selection through individual and population mechanisms.