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Limits to Natural Selection

Limits to Natural Selection

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.

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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Visually Sexing Loggerhead Shrike Lanius Ludovicianus Using Plumage Coloration and Pattern

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Published on: March 8, 2020

Urbanization drives adaptive evolution in a Neotropical bird.

Rilquer Mascarenhas¹, Pedro Milet Meirelles¹, Henrique Batalha-Filho¹

¹National Institute of Science and Technology in Interdisciplinary and Transdisciplinary Studies in Ecology and Evolution (INCT IN-TREE), Instituto de Biologia, Universidade Federal da Bahia, 40170-115 Salvador, Bahia, Brazil.

Current Zoology

|August 28, 2023

Summary

Urban birds, like the bananaquit (Coereba flaveola), show genetic changes linked to adaptation. These genetic shifts in urban populations may enhance behavioral flexibility in response to city environments.

Keywords:

South America behavioral adaptation phenotypic plasticity selection selective sweep

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Area of Science:

Evolutionary biology
Urban ecology
Genomics

Background:

Urbanization significantly alters natural habitats, potentially driving local adaptation in wildlife populations.
Behavioral plasticity is a key factor in avian adaptation to changing environments, but underlying genetic mechanisms are often unclear.
Understanding genetic adaptation in urban populations is crucial for both evolutionary theory and conservation management.

Purpose of the Study:

To investigate local adaptation in urban populations of the Neotropical bird, Coereba flaveola.
To determine if observed behavioral adaptations in urban birds correlate with genetic signatures of natural selection.
To identify specific genes and biological processes influenced by urban selective pressures.

Main Methods:

A genome-scan approach using RADseq genomic data was employed.
24 Coereba flaveola individuals were sampled from both urban and rural environments.
Genomic data were generated, assembled using a reference genome, and analyzed to detect loci under selection.

Main Results:

46 loci were identified as putative selection outliers.
30 of these loci were associated with biological processes relevant to urban adaptation, including metabolism, gene expression, and immunity.
Genes involved in nervous system development showed significant signatures of selection, linking behavioral and genetic adaptation.

Conclusions:

Urban environments exert selective pressures that drive local adaptation in bird populations.
Behavioral plasticity in urban birds may be facilitated by genetic changes, particularly in genes related to nervous system development.
Findings support the role of cities as unique selective environments promoting adaptation through genetic mechanisms.