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Related Experiment Video

Updated: May 8, 2026

Visualizing Visual Adaptation
04:43

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Published on: April 24, 2017

Urban behavioural adaptation.

Colin J Garroway, Ben C Sheldon

    Molecular Ecology
    |August 23, 2013
    PubMed
    Summary
    This summary is machine-generated.

    Urban blackbirds show genetic differences from rural populations, particularly in a gene linked to behavior. This suggests urbanization can drive consistent genetic selection in wild species.

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    Area of Science:

    • Evolutionary biology
    • Urban ecology
    • Behavioral genetics

    Background:

    • Urbanization is a significant human impact causing environmental change and selection pressures.
    • Some species, like the blackbird (Turdus merula), successfully colonize urban environments, offering a model for adaptation studies.
    • Understanding the genetic basis of behavioral adaptation is crucial for explaining species' success in novel environments.

    Purpose of the Study:

    • To investigate the genetic underpinnings of behavioral differences between urban and rural blackbirds.
    • To test for genetic divergence in candidate genes associated with behaviors relevant to urban colonization.
    • To determine if urbanization exerts homogeneous selection pressures leading to genetic adaptation.

    Main Methods:

    • Comparison of paired urban and rural blackbird populations.
    • Analysis of genetic variation at candidate genes, including an exonic microsatellite near the SERT gene.
    • Hypothesizing the role of SERT in behaviors like harm avoidance relevant to urban tolerance.

    Main Results:

    • Evidence of consistent genetic divergence between urban and rural blackbirds at a microsatellite marker associated with the SERT gene.
    • SERT gene is implicated in behavioral traits, such as harm avoidance, potentially facilitating urban adaptation.
    • This study provides early evidence for a genetic basis of behavioral adaptation to urban environments.

    Conclusions:

    • Urban environments can impose significant and potentially homogeneous selection pressures on wild populations.
    • Genetic adaptation, particularly in behavior-related genes like SERT, plays a role in the successful colonization of urban areas by species like the blackbird.
    • Further research into the genetic architecture of adaptation is needed to fully understand species' responses to urbanization.