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Related Concept Videos

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.

Conservation of Declining Populations

Conservation of Declining Populations

Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.

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.

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.

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.

Hybrid Zones

Hybrid Zones

Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.

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Related Experiment Video

Updated: Jan 12, 2026

Probing the Limits of Egg Recognition Using Egg Rejection Experiments Along Phenotypic Gradients

Probing the Limits of Egg Recognition Using Egg Rejection Experiments Along Phenotypic Gradients

Published on: August 22, 2018

How common cuckoos adapt to multiple hosts.

Michael D Sorenson¹, Claire N Spottiswoode^2,3

¹Department of Biology, Boston University, Boston, MA, USA.

Science (New York, N.Y.)

|October 30, 2025

Summary

This summary is machine-generated.

Genomic data reveal the complex evolutionary strategies behind cuckoo egg mimicry. This research uncovers the genetic basis for how cuckoos evolve to lay eggs that match their hosts.

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Last Updated: Jan 12, 2026

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Published on: August 22, 2018

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Published on: July 22, 2018

Area of Science:

Evolutionary Biology
Genomics
Ornithology

Background:

Brood parasitism is a significant evolutionary strategy in birds, notably in cuckoos.
Egg mimicry, where parasitic eggs resemble host eggs, is a key adaptation for brood parasites.
Understanding the genetic underpinnings of this mimicry is crucial for evolutionary studies.

Purpose of the Study:

To investigate the genomic basis of egg mimicry evolution in cuckoos.
To explore the genetic complexity and evolutionary pathways driving cuckoo egg adaptations.
To identify genes and genetic mechanisms involved in host-specific egg matching.

Main Methods:

Comparative genomics analysis of cuckoo species with varying degrees of egg mimicry.
Whole-genome sequencing and phylogenetic analyses.
Identification of candidate genes under selection related to eggshell composition and coloration.

Main Results:

Genomic data reveal significant genetic variation associated with egg mimicry.
Specific genes related to pigment production and shell formation show signatures of rapid evolution.
Evidence suggests a complex interplay of genes contributing to the diversity of cuckoo egg phenotypes.

Conclusions:

The evolution of cuckoo egg mimicry is genetically complex and involves multiple genes.
Genomic insights provide a deeper understanding of the co-evolutionary arms race between cuckoos and their hosts.
Future research can leverage these findings to explore other complex adaptive traits in birds.