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Speciation Rates

Speciation Rates

Evolutionary Psychology

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...

Mate Choice

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.

Frequency-dependent Selection

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.

Genetics of Speciation

Genetics of Speciation

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

Natural Selection and Mating Preferences

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,...

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Related Experiment Video

Updated: Dec 8, 2025

Manipulation of Color Patterns in Jumping Spiders for Use in Behavioral Experiments

Manipulation of Color Patterns in Jumping Spiders for Use in Behavioral Experiments

Published on: May 21, 2019

Visual mate preference evolution during butterfly speciation is linked to neural processing genes.

Matteo Rossi^1,2, Alexander E Hausmann³, Timothy J Thurman^4,5

¹Division of Evolutionary Biology, LMU, Munich, Germany. rossi@bio.lmu.de.

Nature Communications

|September 22, 2020

Summary

This summary is machine-generated.

Genetic changes in mate preference behaviors drive species divergence. Researchers identified five genes in Heliconius butterflies linked to visual preference, suggesting neural processing shifts enable speciation without altering environmental perception.

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Area of Science:

Evolutionary biology
Neurogenetics
Animal behavior

Background:

Reproductive isolation is key to speciation, often driven by mate choice rather than hybrid inviability.
The genetic underpinnings of mate preference evolution remain largely unknown.
Heliconius butterflies use warning patterns for species recognition, making them a model for studying visual preference divergence.

Purpose of the Study:

To identify genetic factors influencing divergent visual mate preferences in sympatric Heliconius butterflies.
To investigate the role of neural tissue gene expression in the evolution of mate choice behaviors.
To understand the genetic basis of speciation through altered mate recognition.

Main Methods:

Quantitative Trait Loci (QTL) mapping of visual preference divergence.
Population genomic analyses across sympatric species.
Gene expression profiling of neural tissues (central brain, optic lobes, ommatidia) during development.

Main Results:

A specific genomic region containing 200 genes was associated with divergent visual preferences.
Five candidate genes were identified as strongly linked to these behavioral differences.
Three identified genes (an ionotropic glutamate receptor and two regucalcins) are involved in neural signaling pathways.

Conclusions:

Divergent visual preferences in Heliconius butterflies are associated with specific genes involved in neural signaling.
Evolutionary shifts in visual integration or processing may underlie mate preference changes.
These genetic modifications allow for the evolution of mate choice without impacting broader environmental perception, facilitating speciation.