His theory of peripatric speciation ( a more precise form of allopatric speciation which he advanced ), based on his work on birds, is still considered a leading mode of speciation, and was the theoretical underpinning for the theory of punctuated equilibrium, proposed by Niles Eldredge and Stephen Jay Gould.

Phacopid trilobite Eldredgeops rana crassituberculata, the genus is named after Niles Eldredge

It is a term coined by Stephen Jay Gould and Niles Eldredge to contrast with their model of punctuated equilibrium, which is gradualist itself, but argues that most evolution is marked by long periods of evolutionary stability ( called stasis ), which is punctuated by rare instances of branching evolution.

Eldredge and Gould proposed that the degree of gradualism commonly attributed to Charles Darwin is virtually nonexistent in the fossil record, and that stasis dominates the history of most fossil species.

I coined the term punctuated equilibrium and wrote most of our 1972 paper, but Niles is the proper first author in our pairing of Eldredge and Gould.

" It is this particular commitment that Eldredge and Gould have aimed to overturn.

He concludes that it is his own vision that genes play a causal role in evolution ", while Gould ( and Eldredge ) " sees genes as passive recorders of what worked better than what ".

* 1972 — Stephen Jay Gould and Niles Eldredge proposed an idea they call " punctuated equilibrium ", which states that the fossil record is an accurate depiction of the pace of evolution, with long periods of " stasis " ( little change ) punctuated by brief periods of rapid change and species formation ( within a lineage ).

They are discovered in each other's arms by Lieutenant Biddle ( John Eldredge ), who is also in love with Kit.

Colona, Eldredge, and Dallas are located in the northern reaches of the county along U. S. Highway 550, though Eldredge and Dallas are located within the valleys of the San Juan Mountains while Colona is in the short stretch of the Uncompahgre Valley within Ouray County.

It is also home to the Detroit Skating Club where a number of world-class figure skaters have trained, including single skaters Tara Lipinski, Todd Eldredge, Alissa Czisny, Adam Rippon, Jeremy Abbott and ice dancers Nathalie Pechalat / Fabian Bourzat, Kaitlyn Weaver / Andrew Poje, Naomi Lang / Peter Tchernyshev, Elizabeth Punsalan / Jerod Swallow.

West Cape May, formerly known as Eldredge, is one of the four jurisdictions that comprise Cape Island in Cape May County.

Kim Sterelny ( 2007 ) cites this rapid natural selection as illustrating an important point about periods of relative stasis in the punctuated equilibrium hypothesis of Niles Eldredge and Stephen Jay Gould: " In claiming that species typically undergo no further evolutionary change once speciation is complete, they are not claiming that there is no change at all between one generation and the next.

Before opening night, he insists they marry, but Joyce resists his proposal, hiding the fact she is married to Gordon Heath ( John Eldredge ), an ineffectual but devoted man who was financially ruined by their marriage.

The town is home to the Eldredge Public Library, named for its benefactor and designed by a student of H. H. Richardson.

The theory of punctuated equilibrium developed by Stephen Jay Gould and Niles Eldredge and first presented in 1972 is often mistakenly drawn into the discussion of transitional fossils.

The historian Elizabeth Eldredge challenged Cobbing's thesis on the grounds that there is scant evidence of the resumption of the Portuguese slave trade out of Delagoa Bay before 1823, a finding that undermines Cobbing's thesis that Shaka's early military activities were a response to slave raids.

* Eric Eldredge ( 2008-present )- Based in New York City, New York, he is responsible for programming and live keyboards.

Niles Eldredge ( born August 25, 1943 ) is an American paleontologist, who, along with Stephen Jay Gould, proposed the theory of punctuated equilibrium in 1972.

While some evolutionary biologists claim that speciation events have remained relatively constant over time, some palaeontologists such as Niles Eldredge and Stephen Jay Gould have argued that species usually remain unchanged over long stretches of time, and that speciation occurs only over relatively brief intervals, a view known as punctuated equilibrium.

A year before their 1972 Eldredge and Gould paper, Niles Eldredge published a paper in the journal Evolution which suggested that gradual evolution was seldom seen in the fossil record and argued that Ernst Mayr's standard mechanism of allopatric speciation might suggest a possible resolution.

" Eldredge and Gould, believing that evolution jumps between stability and relative rapidity, are described as " discrete variable speedists ," and " in this respect they are genuinely radical.

In 1972, the notion of gradualism in evolution was challenged by a theory of " punctuated equilibrium " put forward by Gould and Niles Eldredge, proposing evolutionary changes could occur in relatively rapid spurts, when selective pressures were heightened, punctuating long periods of morphological stability, as well-adapted organisms coped successfully in their respective environments.

To explain these jumps, Gould and Eldredge envisaged comparatively long periods of genetic stability separated by periods of rapid evolution.

Although these approaches were not always welcomed ( at least initially ) by specialists in the subjects examined, SOC has nevertheless become established as a strong candidate for explaining a number of natural phenomena, including: earthquakes ( which, long before SOC was discovered, were known as a source of scale-invariant behaviour such as the Gutenberg-Richter law describing the statistical distribution of earthquake sizes, and the Omori law describing the frequency of aftershocks ); solar flares ; fluctuations in economic systems such as financial markets ( references to SOC are common in econophysics ); landscape formation ; forest fires ; landslides ; epidemics ; and biological evolution ( where SOC has been invoked, for example, as the dynamical mechanism behind the theory of " punctuated equilibria " put forward by Niles Eldredge and Stephen Jay Gould ).

Cultural evolution follows punctuated equilibrium which Gould and Eldredge developed for biological evolution.

Mayr later complimented Eldredge and Gould's paper, stating that evolutionary stasis had been " unexpected by most evolutionary biologists " and that punctuated equilibrium " had a major impact on paleontology and evolutionary biology.

John Lyne and Henry Howe, in a more positive evaluation, states that " re-analysis of existing fossil data has shown, to the increasing satisfaction of the paleontological community, that Eldredge and Gould were correct in identifying periods of evolutionary stasis which are interrupted by much shorter periods of evolutionary change.

Early in his career, Gould and Niles Eldredge developed the theory of punctuated equilibrium, in which evolutionary change occurs relatively rapidly, alternating with longer periods of relative evolutionary stability.

* 1972 — Niles Eldredge and Stephen Jay Gould propose punctuated equilibrium, claiming that the evolutionary history of most species involves long intervals of stasis between relatively short periods of rapid change.

Eldredge went on to develop a hierarchical vision of evolutionary and ecological systems.

* Eldredge, N., 1984, « Large-scale biological entities and the evolutionary process », Proceedings of the Biennial Meeting of the Philosophy of Science Association 1984, vol.

This heuristic was also applied to the theory of punctuated equilibrium proposed by Niles Eldredge and Gould.

Apart from the commonly cited example of water turning to steam with increased temperature, Gould and Eldredge noted another analogy in information theory, " with its jargon of equilibrium, steady state, and homeostasis maintained by negative feedback ," and " extremely rapid transitions that occur with positive feedback.

In 1972, paleontologists Niles Eldredge and Stephen Jay Gould published a landmark paper developing this theory and called it punctuated equilibria.

Although some of the basic workings of the theory were proposed and identified by Mayr in 1954, historians of science generally recognize the 1972 paper by Niles Eldredge and Stephen Jay Gould as the foundational document of the new paleobiological research program.

John Wilkins and Gareth Nelson have argued that French architect Pierre Trémaux proposed an " anticipation of the theory of punctuated equilibrium of Gould and Eldredge.

When Eldredge and Gould published their 1972 paper, allopatric speciation was considered the " standard " theory of speciation.

The punctuational nature of punctuated equilibrium has engendered perhaps the most confusion over Eldredge and Gould's theory.

Gould's most significant contribution to science was the theory of punctuated equilibrium, which he developed with Niles Eldredge in 1972.

Niles Eldredge and Stephen Jay Gould developed the same basic theory a century later, a theory known as punctuated equilibrium.