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Updated: May 2, 2026

Milk Collection Methods for Mice and Reeves' Muntjac Deer

Milk Collection Methods for Mice and Reeves' Muntjac Deer

Published on: July 19, 2014

Multiple routes to mammalian diversity.

Chris Venditti¹, Andrew Meade, Mark Pagel

¹Department of Biological Sciences, University of Hull, Hull HU6 7RX, UK. c.venditti@hull.ac.uk

|October 21, 2011

Summary

This summary is machine-generated.

Mammalian evolution shows that species don't always fill ecological niches gradually. Instead, rapid bursts of evolutionary rate increase, followed by stabilization, shape mammalian diversity.

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Area of Science:

Evolutionary biology
Paleontology
Mammalian radiation

Background:

Traditional evolutionary theory posits early rapid divergence followed by slow fine-tuning.
This model suggests species gradually fill ecological niches.
Recent research challenges this long-held assumption.

Purpose of the Study:

To investigate temporal shifts in evolutionary rates across mammalian diversification.
To test established theories of species divergence and niche filling.
To analyze the relationship between morphological diversification and speciation.

Main Methods:

Application of statistical methods to detect shifts in evolutionary rates.
Analysis of a comprehensive mammalian phylogeny.
Inclusion of body size data for 3,185 extant species.

Main Results:

Most mammal species show no sustained increase in evolutionary rates.
A subset experienced explosive, short-lived rate increases (10- to 52-fold) preceding diversification.
Other species exhibited sustained rate increases or decreases.
Morphological diversification is decoupled from speciation.

Conclusions:

Ecological niches do not appear to fill up predictably.
Morphological diversity arises through varied processes, rates, and timings.
Evolutionary diversification is more flexible than previously assumed.