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Urbanization drives contemporary evolution in stream fish.

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Summary
This summary is machine-generated.

Urbanization drives evolutionary changes in fish body shape. Different fish species adapt uniquely to altered stream conditions, showing rapid, genetically based morphological shifts.

Keywords:
Rhinichthys obtususSemotilus atromaculatuscreek chubglobal environmental changehuman impactsmorphologyphenotypic plasticityurban streamswestern blacknose dace

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Environmental Science

Background:

  • Human activities like urbanization can impact biodiversity.
  • Urbanization alters aquatic environments, specifically stream hydrology and water velocity.
  • These environmental changes can impose new selective pressures on aquatic species.

Purpose of the Study:

  • To investigate how urbanization drives evolutionary divergence in fish body morphology.
  • To examine the adaptive responses of western blacknose dace and creek chub to urban stream conditions.
  • To determine if observed morphological differences are genetically based or due to phenotypic plasticity.

Main Methods:

  • Compared fish morphology in urban versus rural streams.
  • Analyzed historical museum collections of creek chub over 50 years.
  • Conducted laboratory experiments raising creek chub from different populations under controlled conditions.

Main Results:

  • In urban streams, dace evolved more streamlined bodies, while chub developed deeper bodies.
  • Creek chub showed rapid deepening of bodies correlating with increasing urbanization over 50 years.
  • Morphological differences in creek chub were primarily genetically based, not environmentally induced plasticity.

Conclusions:

  • Urbanization can induce rapid, adaptive evolutionary changes in fish morphology.
  • Different species exhibit distinct evolutionary trajectories in response to urbanization.
  • These findings highlight the potential for unpredictable evolutionary responses to environmental disturbances.