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Speciation Rates

Speciation Rates

The Evidence for Evolution

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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.

Diversity of Protists II

Diversity of Protists II

Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...

Diversity of Protists III

Diversity of Protists III

Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...

Diversity of Protists IV

Diversity of Protists IV

Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...

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

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Related Experiment Video

Updated: Jul 20, 2025

Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations

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Published on: December 7, 2021

Clade density and the evolution of diversity-dependent diversification.

Marcio R Pie¹, Raquel Divieso², Fernanda S Caron²

¹Biology Department, Edge Hill University, Ormskirk, Lancashire, UK. piem@edgehill.ac.uk.

Nature Communications

|July 29, 2023

Summary

Ecological limits on species diversity are often assumed but lack evidence. This study found no link between closely related species (clade density) and speciation rates in terrestrial vertebrates, questioning diversity-dependent diversification theories.

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Area of Science:

Evolutionary Biology
Ecology
Biodiversity Science

Background:

The concept of ecological limits to species richness is a common assumption in evolutionary studies.
Empirical evidence supporting these diversity-dependent diversification limits is scarce.
Understanding factors that regulate regional species pools is crucial for ecological and evolutionary theory.

Purpose of the Study:

To empirically test the assumption that ecological limits, specifically sympatry with related species, constrain speciation rates.
To investigate the relationship between the density of related species in a region and the rate of new species formation.
To evaluate the mechanistic foundation of diversity-dependent diversification.

Main Methods:

Integrated geographical distribution and phylogenetic data for nearly 6,000 terrestrial vertebrate species.
Introduced and calculated 'clade density': the sum of overlapping areas with related species, weighted by phylogenetic distance.
Statistically analyzed the relationship between clade density and speciation rates across different taxa and phylogenetic uncertainties.

Main Results:

No significant relationship was found between clade density and speciation rates for terrestrial vertebrates.
This lack of correlation held true regardless of the taxonomic group analyzed or uncertainties in phylogenetic reconstructions.
The results challenge the prevailing notion that the presence of related species directly limits diversification.

Conclusions:

The mechanistic basis for diversity-dependent diversification appears fragile and requires re-evaluation.
The study highlights the need for novel research into the actual mechanisms that shape regional species diversity.
Current assumptions about ecological limits to species number may not be universally applicable or empirically supported.