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What is Natural Selection?

What is Natural Selection?

Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.

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.

Speciation Rates

Speciation Rates

Competition

Competition

When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.

Predator-Prey Interactions

Predator-Prey Interactions

Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.

Mutation, Gene Flow, and Genetic Drift

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).

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Related Experiment Video

Updated: Jun 2, 2025

Methods for Staging Pupal Periods and Measurement of Wing Pigmentation of Drosophila guttifera

Methods for Staging Pupal Periods and Measurement of Wing Pigmentation of Drosophila guttifera

Published on: January 24, 2018

Kin Competition Drives the Evolution of Earlier Metamorphosis.

Bing Dong¹, Andy Gardner¹

¹School of Biology University of St Andrews Dyers Brae St Andrews UK.

Ecology and Evolution

|January 16, 2025

Summary

This summary is machine-generated.

Kin selection influences the timing of metamorphosis by favoring earlier transitions when larvae compete intensely with relatives. This study models how relatedness impacts the evolution of this critical life-history event.

Keywords:

Hamilton's rule complex life cycle inclusive fitness kin competition kin selection metamorphosis

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Last Updated: Jun 2, 2025

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Area of Science:

Evolutionary biology
Developmental biology
Behavioral ecology

Background:

Metamorphosis is a key life-history transition in many animals.
Previous studies focused on ecological benefits, but evolutionary drivers, especially kin selection, are less understood.
Larval stages often exhibit kin clustering, creating opportunities for kin selection.

Purpose of the Study:

To formally investigate how kin selection modulates the evolution of metamorphosis timing.
To develop a mathematical model exploring the interplay between larval competition, relatedness, and metamorphosis.
To predict how kin selection influences the optimal transition from larva to adult.

Main Methods:

Developed a mathematical model analyzing the optimal timing of metamorphosis.
Incorporated varying intensities of larval competition (no competition to full competition).
Included a range of relatedness coefficients (unrelated to clonality).

Main Results:

Kin selection can significantly alter the optimal timing of metamorphosis.
Predictions show how relatedness and competition intensity jointly affect the larva-to-adult transition.
The model provides a framework for understanding empirical observations on metamorphosis timing.

Conclusions:

Kin selection is a crucial factor in the evolutionary dynamics of metamorphosis.
The timing of metamorphosis is sensitive to the degree of relatedness among competing larvae.
This work offers a new perspective on the individual-fitness benefits driving metamorphosis evolution.