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Related Concept Videos

The Evidence for Evolution02:55

The Evidence for Evolution

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
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Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
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Related Experiment Video

Updated: Mar 10, 2026

Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli
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Urban driven phenotypic changes: empirical observations and theoretical implications for eco-evolutionary feedback.

Marina Alberti1, John Marzluff2, Victoria M Hunt3

  • 1Department of Urban Design and Planning, University of Washington, Seattle, WA 98195, USA malberti@uw.edu.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
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Cities are driving micro-evolution, altering ecosystem functions. Understanding these rapid trait changes in urban environments is crucial for ecological and evolutionary theory and long-term ecosystem stability.

Keywords:
eco-evolutionecosystem functionurban ecologyurbanization

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Urban Ecology

Background:

  • Urbanization is increasingly recognized as a driver of micro-evolution.
  • Intraspecific trait variation significantly impacts ecosystem functions like nutrient cycling and productivity.
  • The interplay between ecological changes and evolutionary responses is a developing area of research.

Purpose of the Study:

  • To review mechanisms linking urban development to rapid phenotypic changes in organisms.
  • To distinguish between micro-evolutionary changes and phenotypic plasticity in urban settings.
  • To explore the implications of human-mediated trait changes for ecological and evolutionary theory.

Main Methods:

  • Literature review of existing studies on urbanization and phenotypic trait variation.
  • Analysis of evidence for micro-evolution versus phenotypic plasticity in urban species.
  • Synthesis of findings to understand eco-evolutionary feedback loops.

Main Results:

  • Urban environments present multiple, simultaneous selection pressures that can accelerate trait changes.
  • Evidence suggests both micro-evolutionary adaptation and phenotypic plasticity occur in response to urbanization.
  • These changes have direct consequences for urban ecosystem productivity and stability.

Conclusions:

  • Studying human-mediated trait changes in urban ecosystems offers insights into fundamental ecological and evolutionary processes.
  • Understanding these eco-evolutionary feedbacks is vital for predicting and managing ecosystem function.
  • This research contributes to comprehending the long-term consequences of global urbanization on biodiversity and ecosystem services.