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Natural Selection and Adaptation

Natural Selection and Adaptation

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.
Beyond physical adaptations,...

Schemas

Schemas

A schema is a mental construct consisting of a cluster or collection of related concepts (Bartlett, 1932). There are many different types of schemata, and they all have one thing in common: schemata are a method of organizing information that allows the brain to work more efficiently. When a schema is activated, the brain makes immediate assumptions about the person or object being observed.

Genetic Drift

Genetic Drift

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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Population Growth

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The Evidence for Evolution

The Evidence for Evolution

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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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.

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Adaptive Evolution in Cities: Progress and Misconceptions.

Max R Lambert¹, Kristien I Brans², Simone Des Roches³

¹Department of Environmental Science, Policy, and Management, University of California Berkeley, Berkeley, CA, USA.

Trends in Ecology & Evolution

|December 21, 2020

Summary

This summary is machine-generated.

Urban adaptation, the evolution of species to cities, is often overstated. A review found only six comprehensive examples, highlighting the need for better research methods to accurately study and conserve urban biodiversity.

Keywords:

convergent evolution local adaptation maladaptation parallel evolution urban adapter urban evolution

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Area of Science:

Evolutionary Biology
Urban Ecology
Conservation Biology

Background:

Current understanding suggests urban adaptation is widespread across species and cities.
However, the actual evidence for adaptive evolution in urban environments is less comprehensive than often portrayed.

Purpose of the Study:

To critically evaluate the evidence for urban adaptation.
To assess the methodologies used to study urban adaptation.
To propose a future research agenda for the field.

Main Methods:

Systematic review of hundreds of studies on urban adaptation.
Analysis of the strengths and limitations of current research methods.
Synthesis of preliminary evidence from diverse urban systems.

Main Results:

Identified only six comprehensive examples of species adaptively evolving to urbanization.
Highlighted methodological challenges and limitations in existing research.
Documented preliminary evidence from various systems requiring further investigation.

Conclusions:

The pervasiveness of urban adaptation is currently not supported by robust evidence.
Improved research methodologies are crucial for accurately understanding and documenting urban evolutionary processes.
Accurate narratives and advanced research are essential for conserving urban biodiversity.