punctuated equilibrium - a theory of evolution holding that evolutionary change in the fossil record came in fits and starts rather than in a steady process of slow change. The punctuated-equilibrium model Early stage/meeting. The theory holds that species originate too rapidly to enable their origins to be traced by paleontologists (punctuation), and then persist unchanged through geological time in stasis (equilibrium). According to Gould, punctuated equilibrium revised a key pillar "in the central logic of Darwinian theory." Punctuated equilibrium (also called punctuated equilibria) is a theory in evolutionary biology which proposes that once a species appears in the fossil record the population will become stable, showing little evolutionary change for most of its geological history. 1 This model deals with the dynamics of a complex system, suggesting that most nonlinear systems exist in an extended period of stasis, which is later punctuated by sudden shifts of radical change. BibTex. Punctuated equilibrium is a term that refers to the evolutionary changes of plants and animals in a relatively static way. punctuated equilibrium meaning: 1. a theory of evolution that claims that change happens suddenly over short periods of time…. Some evolutionary biologists have argued that while punctuated equilibrium was "of great interest to biology generally," it merely modified neo-Darwinism in a manner that was fully compatible with what had been known before. Citation Help Export. theory of punctuated equilibrium. Put another way, long periods of equilibrium (no change) are "punctuated" by short periods of rapid change. Punctuated equilibrium is a theory that states that evolution occurs primarily through short bursts of intense speciation, followed by lengthy periods of stasis or equilibrium. Punctuated equilibrium definition is - evolution that is characterized by long periods of stability in the characteristics of an organism and short periods of rapid change during which new forms appear especially from small subpopulations of the ancestral form in restricted parts of its geographic range; also : a theory or model of evolution emphasizing this. Punctuated Equilibrium. Punctuated equilibrium asserts that evolution occurs in short bursts followed long periods of equilibrium. Within this universally accepted theory there are different ways in which theorists suggest that groups are formed and develop. The most powerful expectation in this area originates from punctuated equilibrium theory (PET), originally developed by Baumgartner and Jones and subsequently refined by others (e.g., Baumgartner et al. Gradualism is selection and variation that happens more gradually. The punctuated equilibrium model (PEM) of group development was first proposed by Connie Gersick in 1988. Punctuated equilibrium was developed as an alternative to phyletic gradualism, which stresses consistent, cumulative changes to species. ‘believe … that punctuated equilibrium has been accepted by most of our colleagues … as a valuable addition to evolutionary theory.’ 45. Significance And Acceptance Of Punctuated Equilibrium. Punctuated equilibrium (as I understand it from Krasner’s 1984 work “Approaches to the State”) essentially says that institutions continue with the status quo until there is a crisis, and then either adapt to the crisis or die. This model argues that instead of developing gradually over time as proposed by classic linear group development models, work groups progress through long periods of inertia punctuated by concentrated revolutionary periods of quantum change, hence the term “punctuated equilibrium” model. Gradualism and punctuated equilibrium are two ways in which the evolution of a species can occur. In contrast to the concept that life forms change slowly over time in response to their environment, punctuated equilibrium is a theory that …

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