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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.

Evolution of New Traits in Microbes

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...

Convergent Evolution

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.

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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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Updated: Apr 17, 2026

Resurrection of Dormant Daphnia magna: Protocol and Applications

Resurrection of Dormant Daphnia magna: Protocol and Applications

Published on: January 19, 2018

On the complexity of triggering evolutionary radiations.

Yanis Bouchenak-Khelladi¹, Renske E Onstein¹, Yaowu Xing¹

¹Institute of Systematic Botany, University of Zurich, 107 Zollikerstrasse, Zurich, CH-8008, Switzerland.

The New Phytologist

|February 19, 2015

Summary

This summary is machine-generated.

Identifying evolutionary radiation triggers is challenging. This study introduces a framework classifying variables as extrinsic or intrinsic, revealing that both are crucial for radiations, regardless of their origin sequence.

Keywords:

adaptive zone angiosperms diversification drivers diversification rate shifts exaptations key innovations radiation triggers

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Area of Science:

Evolutionary biology
Phylogenetics
Diversification science

Background:

Phylogenetic methods can reconstruct evolutionary radiations from extant taxa.
Identifying the specific triggers of these radiations remains a significant challenge in evolutionary biology.

Purpose of the Study:

To propose a conceptual framework for exploring variables influencing evolutionary radiations.
To classify these variables as extrinsic conditions or intrinsic traits and their roles (background, trigger, modulator).

Main Methods:

Applied a novel conceptual framework to three diverse angiosperm clades (Ericaceae, Fagales, Poales).
Identified radiation events, selected potential diversification-associated variables, and inferred evolutionary temporal sequences.
Classified variables based on their origin relative to radiation events (backgrounds, triggers, modulators).

Main Results:

Detected 13 shifts in diversification regimes across the three clades.
Found that evolutionary radiations necessitate both extrinsic conditions and intrinsic traits.
Demonstrated that the sequence of these factors is not critical for radiation initiation.
Showed that diversification drivers are more variable than conserved traits.

Conclusions:

The proposed framework facilitates the exploration of causative factors behind evolutionary radiations.
Both extrinsic and intrinsic factors are essential, but their temporal order is flexible.
Variable traits act as diversification drivers, while conserved traits facilitate habitat occupation.