Constant extinction, constrained diversification, and uncoordinated stasis in North American mammals

  title={Constant extinction, constrained diversification, and uncoordinated stasis in North American mammals},
  author={John Alroy},
  journal={Palaeogeography, Palaeoclimatology, Palaeoecology},
  • J. Alroy
  • Published 20 December 1996
  • Environmental Science, Geography
  • Palaeogeography, Palaeoclimatology, Palaeoecology

The role of clade competition in the diversification of North American canids

Contrary to current expectation, it is found that competition from phylogenetically distant, but ecologically similar, clades played a more substantial role in canid diversification than climate change and body size evolution.

Cenozoic bolide impacts and biotic change in North American mammals.

  • J. Alroy
  • Environmental Science, Geography
  • 2003
The results challenge the idea that extraterrestrial impacts drive all, most, or even many extinction and radiation episodes in terrestrial organisms, and add to other evidence that natural, long-term biotic changes are often independent of changes in the physical environment.

Coordinated stasis: An overview

Speciation and extinction in the fossil record of North American mammals

Paleontological research has focused far more strongly on taxonomic diversity than on speciation in recent years, and turnover rates have focused on two overriding issues: whether they can be explained using intrinsic dynamic mechanisms, such as either density dependence or constraints on morphology.

Dynamics of origination and extinction in the marine fossil record

  • J. Alroy
  • Environmental Science, Geography
    Proceedings of the National Academy of Sciences
  • 2008
The discipline-wide effort to database the fossil record at the occurrence level has made it possible to estimate marine invertebrate extinction and origination rates with much greater accuracy. The

Global Ordovician faunal transitions in the marine benthos: ultimate causes

The hypothesis that diversity-dependent origination, particularly in trilobites, contributed to the Ordovician faunal transitions is supported, as well as the effects of increased productivity, if indeed they were large enough to influence global diversification patterns, did not proceed in the hypothesized manner.

SIXTEEN Speciation and extinction in the fossil record of North American mammals john alroy

Introduction Paleontological data have been used for decades to address a series of very general and intrinsically interesting questions concerning speciation. Many of them are essentially

The Shifting Balance of Diversity Among Major Marine Animal Groups

  • J. Alroy
  • Environmental Science, Geography
  • 2010
Future assemblies of animals following mass extinction cannot be predicted by analyses of Phanerozoic fossils, and the current global crisis may permanently alter the biosphere’s taxonomic composition by changing the rules of evolution.

Origination and extinction components of taxonomic diversity: general problems

  • M. Foote
  • Environmental Science, Geography
  • 2000
Modeling supports intuitive and empirical arguments that single-interval taxa, being especially sensitive to variation in preservation and interval length, produce many undesirable distortions of the fossil record, and suggests which rate measures are likely to be most accurate in principle.

Faunal turnover rates and mammalian biodiversity of the late Pliocene and Pleistocene of eastern Africa

  • J. McKee
  • Environmental Science, Geography
  • 2001
Abstract Two models of faunal turnover patterns, one with constant turnover and another with climatically induced turnover pulses, were tested against the empirical fossil data of first and last



The challenge of paleoecological stasis: reassessing sources of evolutionary stability.

It is proposed that hierarchical ecosystem theory, when extended to geological time scales, can explain long-term paleoecological stability as the result of ecosystem organization in response to high-frequency disturbance.

Equilibrium Models of Evolutionary Species Diversity and the Number of Empty Niches

A mathematical model of diversification is derived which makes explicit the relationship between maximum species capacity and realized diversity and shows that the proportion of niches empty at equilibrium is a function only of the intrinsic rates of species origination and extinction.

Evolution of land mammal diversity in North America during the Cenozoic

The North American continental patterns of generic richness, extinction, and origination have been reexamined and analyzed in the context of alpha and beta species diversity. The major models of

A kinetic model of Phanerozoic taxonomic diversity; III, Post-Paleozoic families and mass extinctions

The good fit of this model to data on Phanerozoic familial diversity suggests that many of the large-scale patterns of diversification seen in the marine fossil record of animal families are simple consequences of nonlinear interrelationships among a small number of parameters that are intrinsic to the evolutionary faunas and are largely (but not completely) invariant through time.

Probabilities of origination, persistence, and extinction of families of marine invertebrate life

This paper model the process of taxonomic evolution as a Galton-Watson branching process in discrete time and develops methods to estimate the probabilities of origination, persistence, and extinction of fossil taxa.

Conjunction among taxonomic distributions and the Miocene mammalian biochronology of the Great Plains

  • J. Alroy
  • Environmental Science
  • 1992
This paper presents a new means of interpreting the distribution of taxa among taxonomic lists. Traditionally, “similarity” indices have been used to compare lists, and “association” measures have

DOES EVOLUTION TAKE PLACE IN AN ECOLOGICAL VACUUM? II. "'The time has come' the Walrus said..."

Evolution within each of the Ecologic-Evolutionary Units is tightly constrained by ecologic factors-there are no random adaptive radiations, or genera drifting from one community group to another, i.e., overall behaviors and physiologies are not in a continual state of flux.