Punctuated equilibrium, bottom, consists of Morphology ( biology ) | morphological stability and rare bursts of evolutionary change

Punctuated equilibrium ( also called punctuated equilibria form ) is a theory in evolutionary biology which proposes that most species will exhibit little net evolutionary change for most of their geological history, remaining in an extended state called stasis.

Punctuated equilibrium is commonly contrasted against the theory of phyletic gradualism, which states that evolution generally occurs uniformly and by the steady and gradual transformation of whole lineages ( called anagenesis ).

Punctuated equilibrium originated as a logical extension of Ernst Mayr's concept of genetic revolutions by allopatric and especially peripatric speciation as applied to the fossil record.

Punctuated equilibrium differs from Mayr's hypothesis mainly in that Eldredge and Gould placed considerably greater emphasis on stasis, whereas Mayr was generally concerned with explaining the morphological discontinuity ( or " sudden jumps ") found in the fossil record.

Punctuated equilibrium is often portrayed to oppose the concept of gradualism, when it is actually a form of gradualism.

Punctuated equilibrium in social theory is a method of understanding change in complex social systems, particularly how policy change and the development of conflicts seem to progress in extended periods of stasis, punctuated by sudden shifts in radical change.

( 1992 ) " Punctuated equilibrium in fact and theory.

nl: Punctuated equilibrium ( biologie )

Punctuated equilibrium, bottom, consists of Morphology ( biology ) | morphological stability and rare, relatively rapid bursts of evolutionary change.

* Punctuated equilibrium ( occasional periods of sudden change in evolution )

* Punctuated equilibrium was coined in 1972 in the category of evolution, or speciation, etc., but could obviously be applied to other " topics ".

Punctuated equilibrium is different from gradualism.

# REDIRECT Punctuated equilibrium

Punctuated equilibrium is a refinement to evolutionary theory.

* Punctuated equilibrium

# REDIRECT Punctuated equilibrium

Punctuated equilibrium, bottom, consists of Morphology ( biology ) | morphological stability and rare bursts of evolutionary change

* Punctuated equilibrium

Gaster also appears on the album Punctuated Equilibrium by Scott " Wino " Weinrich, released via Southern Lord Records in 2009.

( 1982 ) " Punctuated Equilibrium — A Different Way of Seeing.

* Punctuated Equilibrium at Twenty-by Donald R. Prothero

One style of pottery first found in Carrabelle is named Carrabelle Punctuated.

Her poem Signal at Red, written 1964, is addressed to her correspondent, John Cairns, and alludes to Ian Hamilton Finlay, with whom she had put on plays at the Falcon Theatre in 1962, hers being Punctuated Rhythms.

His play Punctuated Equilibrium received a staged reading by the Hangar Theatre Lab in Ithaca, NY in July 2010.

" Punctuated Culture Change in the San Francisco Bay Area.

Notice that at equilibrium the surface adopts a shape such that an element of volume at any location on its surface has the same potential energy as at any other.

An underlying principle is that the chain may be considered a rigid body once it has attained equilibrium.

This removed their tremendous weight, allowing the land under them to begin to rebound upward in the polar regions, which has been continuing and will continue until isostatic equilibrium is reached.

The theory of comparative advantage argues that in an unrestricted marketplace ( in equilibrium ) each source of production will tend to specialize in that activity where it has comparative ( rather than absolute ) advantage.

General equilibrium theory has demonstrated, with varying degrees of mathematical rigor over time, that under certain conditions of competition, the law of supply and demand predominates in this ideal free and competitive market, influencing prices toward an equilibrium that balances the demands for the products against the supplies.

It re-radiates in all directions, both upwards and downwards ; in equilibrium ( by definition ) the same amount as it has absorbed.

Unlike many other liquids, honey has very poor thermal conductivity, taking a long time to reach thermal equilibrium.

: This model has been used in general equilibrium theory, particularly to show existence and Pareto efficiency of economic equilibria.

Work from the Widom laboratory has shown that nucleosomal DNA is in equilibrium between a wrapped and unwrapped state.

However, in moving the mass back to the equilibrium position, it has acquired momentum which keeps it moving beyond that position, establishing a new restoring force in the opposite sense.

In the spring-mass system, oscillations occur because, at the static equilibrium displacement, the mass has kinetic energy which is converted into potential energy stored in the spring at the extremes of its path.

This assumption of negligible impact of each agent on the equilibrium price has been formalized by Aumann ( 1964 ) by postulating a continuum of infinitesimal agents.

At room temperature and pressure, the water jar reaches equilibrium when the air over the water has a humidity of about 3 %.

Automobile exhaust gas capture has also been proposed to be economical but would require extensive design changes or retrofitting .< ref name = Musadi2011 > Since carbonic acid in seawater is in chemical equilibrium with atmospheric carbon dioxide, extraction of carbon from seawater has been studied.

Much confusion has arisen over what proponents of punctuated equilibrium actually argued, what mechanisms they advocated, how fast the punctuations were, what taxonomic scale their theory applied to, how revolutionary their claims were intended to be, and how punctuated equilibrium related to other ideas like quantum evolution, saltationism, and mass extinction.

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

Dawkins also emphasizes that punctuated equilibrium has been " oversold by some journalists ", but partly due to Eldredge and Gould's " later writings ".

In linguistics, R. M. W. Dixon has proposed a punctuated equilibrium model for language histories, with reference particularly to the prehistory of the indigenous languages of Australia and his objections to the proposed Pama – Nyungan language family there.

there has been an increase in demand which has caused an increase in ( equilibrium ) quantity.

The quantity supplied at each price is the same as before the demand shift, reflecting the fact that the supply curve has not shifted ; but the equilibrium quantity and price are different as a result of the change ( shift ) in demand.