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Speciation Rates

Speciation Rates

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.

Distribution and Dispersion

Distribution and Dispersion

To understand intra-specific interactions in populations, scientists measure the spatial arrangement of species individuals. This geographic arrangement is known as the species distribution or dispersion. Highly territorial species exhibit a uniform distribution pattern, in which individuals are spaced at relatively equal distances from one another. Species that are highly tied to particular resources, such as food or shelter, tend to concentrate around those resources, and thus exhibit a...

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.

What is Evolutionary History?

What is Evolutionary History?

Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.

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Related Experiment Video

Updated: May 23, 2025

JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning

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Global Diversity Patterns are Explained by Diversification Rates and Dispersal at Ancient, Not Shallow, Timescales.

Patrick R Stephens¹, Maxwell J Farrell^2,3, T Jonathan Davies⁴

¹Department of Integrative Biology, 420 Life Sciences West, Oklahoma State University, Stillwater, OK 74078, USA.

Systematic Biology

|March 12, 2025

Summary

This summary is machine-generated.

Global species richness patterns are explained by deep-time diversification rates and colonization time, not recent rates. This resolves paradoxes in birds, fish, and plants, highlighting long-term factors for lizards and snakes.

Keywords:

Climate colonization time diversification rate latitudinal diversity gradient lizards snakes species richness

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Area of Science:

Evolutionary biology
Ecology
Biogeography

Background:

Global species richness patterns are key to understanding evolution and ecology.
Previous studies on birds, fish, and plants showed higher recent diversification rates at higher latitudes, contrary to lower species richness.

Purpose of the Study:

To investigate global species richness patterns in squamates (lizards and snakes).
To test the hypothesis that recent macroevolutionary rates explain paradoxical findings in other taxa.
To identify key factors driving species richness patterns, including diversification rates, climate, and colonization time.

Main Methods:

Analysis of global richness patterns for 10,213 squamate species.
Quantification of diversification rates at recent and long-term timescales.
Statistical exploration of relationships between richness, diversification rates, climate, and colonization time.

Main Results:

Recent diversification rates showed a mismatch with species richness, consistent with prior studies.
Diversification rates estimated over longer timescales positively correlated with geographic richness patterns.
Tropical species richness was linked to ancient colonization of these regions, with colonization time explaining the most variation.

Conclusions:

Deep-time diversification rates, rather than recent rates, are positively related to species richness patterns.
Colonization time is a significant predictor of species richness, suggesting historical factors are crucial.
Understanding large-scale diversity patterns requires integrating climate, long-term diversification dynamics, and regional occupation history.