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Related Concept Videos

Natural Selection and Mating Preferences01:06

Natural Selection and Mating Preferences

The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
Females, due to their biological roles in conception, pregnancy, and nursing, inherently...
Mate Choice01:20

Mate Choice

Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
Inclusive Fitness00:57

Inclusive Fitness

Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.
Evolutionary Psychology01:20

Evolutionary Psychology

Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the human psyche...
Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.

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Related Experiment Video

Updated: May 28, 2026

Using the FishSim Animation Toolchain to Investigate Fish Behavior: A Case Study on Mate-Choice Copying In Sailfin Mollies
10:50

Using the FishSim Animation Toolchain to Investigate Fish Behavior: A Case Study on Mate-Choice Copying In Sailfin Mollies

Published on: November 8, 2018

How do mate-finding Allee effects affect evolutionary rescue?

Puneeth Deraje1,2,3, Hildegard Uecker2

  • 1Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario M5S 3G5, Canada.

Evolution; International Journal of Organic Evolution
|May 26, 2026
PubMed
Summary
This summary is machine-generated.

Mate limitation significantly hinders evolutionary rescue in declining populations. Accounting for this Allee effect is crucial for assessing a population

Keywords:
androdioecydioecyhermaphroditismmate limitationselfingsex ratio

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Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
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Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae

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Related Experiment Videos

Last Updated: May 28, 2026

Using the FishSim Animation Toolchain to Investigate Fish Behavior: A Case Study on Mate-Choice Copying In Sailfin Mollies
10:50

Using the FishSim Animation Toolchain to Investigate Fish Behavior: A Case Study on Mate-Choice Copying In Sailfin Mollies

Published on: November 8, 2018

Assays to Detect UV-reflecting Structures and Determine their Importance in Mate Preference using the Sailfin Molly Poecilia latipinna
06:41

Assays to Detect UV-reflecting Structures and Determine their Importance in Mate Preference using the Sailfin Molly Poecilia latipinna

Published on: September 14, 2016

Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
05:39

Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae

Published on: December 2, 2022

Area of Science:

  • Ecology
  • Evolutionary Biology
  • Population Genetics

Background:

  • Sexually reproducing populations face demographic Allee effects at low densities due to mate-finding challenges.
  • Environmental changes can trigger population declines below the Allee threshold, impeding evolutionary rescue.
  • Existing models often overlook mate limitation, assuming mating is guaranteed even at low population sizes.

Purpose of the Study:

  • To investigate the potential for evolutionary rescue in populations experiencing a demographic Allee effect.
  • To model the impact of mate limitation on evolutionary rescue across different sexual systems.
  • To understand how mate limitation influences optimal evolutionary strategies and genetic variation.

Main Methods:

  • Development of a population genetic model incorporating mate-finding Allee effects.
  • Combination of stochastic computer simulations with mathematical analyses.
  • Examination of effects across various sexual systems (dioecious, androdioecious).

Main Results:

  • Mate limitation can severely impede evolutionary rescue, with impacts varying by sexual system.
  • Optimal sex ratios for rescue shift in dioecious populations but not androdioecious ones.
  • Mate limitation favors standing genetic variation over de novo mutations and alters evolutionary trade-offs.

Conclusions:

  • Mate-finding Allee effects are a critical factor that can limit evolutionary rescue.
  • The structure of sexual systems significantly influences the impact of mate limitation on rescue.
  • Accurate assessment of evolutionary rescue potential requires incorporating positive density dependence.