Corpus ID: 83431839

Punctuated equilibria: an alternative to phyletic gradualism

  title={Punctuated equilibria: an alternative to phyletic gradualism},
  author={Niles Eldredge and S. Gould},
Editorial introduction. Moving from populations to species. we recall that the process of speciation as seen through the hyperopic eyes of the paleontologist is an old and venerable theme. But the significance of "gaps" in the fossil record has been a recurrent "difficulty, .. used on the one hand to show that spontaneous generation is a "fact, .. and on the other hand to illustrate the" incompleteness .. of the fossil record. Some have expressed a third interpretation. which views such gaps as… Expand
Punctuated equilibrium in a neontological context
Against the historical background of the concept of evolution concentrated in speciation events, attempts to investigate tempo and mode of evolution using present-day species since the introduction of the theory of punctuated equilibrium are reviewed. Expand
Detection of punctuated equilibrium from molecular phylogenies
A method to detect punctuated evolution without reference to fossil data is presented, based on the phenotypes of extant species and on their relatedness as revealed by molecular phylogeny, describing morphological differentiation of two species over time. Expand
Modeling Modes of Evolution: Comparing Phyletic Gradualism & Punctuated Equilibrium.
Paleontologists have discovered two major patterns in life that make it difficult to support a totally uniformitarian view of life's development, known as "phyletic gradualism" and "punctuated equilibrium". Expand
Trémaux on species: a theory of allopatric speciation (and punctuated equilibrium) before Wagner.
An interpretation based on translating the term sol as "habitat" is offered to show that Trémaux proposed a theory of allopatric speciation before Wagner and a punctuated equilibrium theory before Gould and Eldredge, and it is suggested that Gould's dismissal of TrÉmaux is motivated by concern that others might think punctuatedilibrium theory was tainted by a connection with Trémaux. Expand
  • S. Stanley
  • Biology, Medicine
  • Evolution; international journal of organic evolution
  • 1982
New evidence is described that strengthens the verdict of the test of adaptive radiation in favor of the punctuational model, which is motivated by statements of earlier workers that the fossil record's testimony is equivocal. Expand
Is there room for punctuated equilibrium in macroevolution?
It is argued that PE is actually a tangle of four unnecessarily conflated questions, and combining these conceptually distinct ideas under the single framework of PE is distracting and confusing, and more likely to hinder progress than to spur it. Expand
Tempo and Mode in Evolution: Punctuated Equilibria and the Modern Synthetic Theory
It is argued that, even accepting punctuated equilibria and an irreducible evolutionary hierarchy, the modern synthetic theory is adequate to explain evolutionary change at all levels of the hierarchy. Expand
Allopatric Speciation and the Fold Catastrophe
A model of a population in a homogenous environment which varies gradually with time and location, and predicts that the morphological variation in the vicinity of the speciation obeys a "square root" law, which in principle can be tested. Expand
Punctuated equilibria; the tempo and mode of evolution reconsidered
It is argued that virtually none of the examples brought forward to refute the model of punctuated equilibria can stand as support for phyletic gradualism; many are so weak and ambiguous that they only reflect the persistent bias for gradualism still deeply embedded in paleontological thought. Expand
The Genomic Drive hypothesis and punctuated evolutionary taxonations, or radiations
The Genomic Drive hypothesis, which is supported by current data, will open the way for the reconciliation of evolutionary theory with the findings of most palaeontologists, and may help to explain the extraordinary fecundity of some orders, and the paucity of species in others, and why there are "fossil species". Expand


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apparent saltation in the Pelicaria lineage
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Lenses are arranged on the visual surface of the eye in vertical dorso-ventral files (Clarkson
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Micraster senonensis was a migrant from elsewhere and that it did not arise and diverge gradually from M. cortestudinarium
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