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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.

Speciation Rates

Speciation Rates

Genetics of Speciation

Genetics of Speciation

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

Gene Flow

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.

Formation of Species

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.

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 1, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Interdependent Phenotypic and Biogeographic Evolution Driven by Biotic Interactions.

Ignacio Quintero^1,2, Michael J Landis^1,3

¹Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT 06511, USA.

Systematic Biology

|December 21, 2019

Summary

This summary is machine-generated.

Biotic interactions, particularly competition, significantly influence species

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Area of Science:

Evolutionary Biology
Ecology
Biogeography

Background:

Biotic interactions are key drivers of trait and biogeographic evolution during lineage diversification.
Interspecific competition can lead to spatial exclusion or niche divergence in sympatric species.
Limited process-generating models have hindered direct testing of biotic interaction effects on evolution.

Purpose of the Study:

To develop a phylogenetic parametric model to test how biotic interactions shape trait and biogeographic evolution.
To investigate the coevolution of trait and range histories.
To explore the role of competition in Darwin's finch radiation.

Main Methods:

Formulation of a phylogenetic parametric model allowing interdependence between trait and biogeographic evolution.
Application of a Bayesian data augmentation approach for parameter estimation.
Simulation studies to validate model performance in distinguishing biotic interaction scenarios.

Main Results:

Limited support for in situ trait divergence in beak size among Darwin's finches.
Stronger evidence for trait convergence (beak shape, tarsus length) and competitive exclusion.
Findings suggest presympatric niche divergence is more likely than postsympatric divergence.

Conclusions:

The developed model provides a robust framework for testing hypotheses on lineage diversification and coevolution.
Biotic interactions, especially competition, played a significant role in Darwin's finch evolutionary history.
The methodology allows for modeling correlated evolution of continuous and discrete characters.