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Evolutionary processes resulting from the accumulation of minor changes over a relatively short period of time; evolutionary changes due to gene mutation.
Evolution of species.



the aggregate of the actuating evolutionary processes occurring within isolated or neighboring populations of a given species. (Populations here are considered as the elementary evolutionary structure; mutations—the basis for genetic variation—as the elementary evolutionary material; and the mutation process, the waves of life, various forms of isolation, and natural selection, as the elementary evolutionary factors.)

Under the pressure of evolutionary factors, change occurs in the genotypic composition of a population—the leading actuating mechanism of the evolutionary process. The term “micro-evolution,” as counterposed to macroevolution, was once used by certain evolutionists to mean variability and the development of forms within a species. Modern microevolutionary theory developed after the synthesis of genetics and classical Darwinism. The basis for the theory was laid by the Soviet geneticist S. S. Chetverikov in 1926 and the English geneticist R. A. Fisher in 1930. In the modern view (sometimes called the synthetic theory of evolution), all of the basic actuating mechanisms of evolution on all levels occur within species—that is, on the microevolutionary level. Microevolution culminates in species formation—in other words, in the appearance of species that are reproductively isolated from the original and all other closely related species. For this reason, there are no distinctions in principle between microevolution and macroevolution, which differ only in their temporal and spatial scale.

Successful research on the microevolutionary level necessitates the synthesis of populational-genetic experiments and quantitative descriptions of the processes of population dynamics and ecology, study of ethological phenomena, analytical application of the theoretical propositions of genetics, and mathematical models of intrapopulational and interpopulational processes.


Chetverikov, S. S. “O nekotorykh momentakh evoliutsionnogo protsessa s tochki zreniia sovremennoi genetiki.” Zhurnal eksperimentaVnoi biologii, 1926, vol. 2, issue 1.
Timofeev-Resovskii, N. V. “Mikroevoliutsiia.” Botanicheskii zhurnal, 1958. vol. 43, no. 3.
Shmal’gauzen, I. I. Faktory evoliutsii, 2nd ed. Moscow, 1968.
Mayr, E. Zoologicheskii vid i evoliutsiia. Moscow, 1968. (Translated from English.)
Mayr, E. Printsipy zoologicheskoi sistematiki. Moscow, 1971. (Translated from English.)
Timofeev-Resovskii, N. V., N. N. Vorontsov, and A. V. lablokov. Kratkii ocherk teorii evoliutsii. Moscow, 1969.
Fisher, R. A. The Genetical Theory of Natural Selection. Oxford, 1930.
Huxley, J. Evolution: The Modern Synthesis, 2nd ed. London, 1963.


References in periodicals archive ?
Based on recent nuclear molecular genetic evidence, the first colonization of America has been characterized as a pre-Clovis single origin serial founding microevolutionary process (Rothhammer and Dillehay 2009; Wang et al.
Although Ayala (2005) supported this idea, he indicated that the study of microevolutionary phenomena is important to macroevolution, because any correct theory of macroevolution must be compatible with well-established microevolutionary principles and theories.
The Macroevolution Conference of 1980, however, decided that, contrary to theory, microevolutionary changes did not add up to macroevolutionary changes.
The microevolutionary aspect of this discourse assumes that isolation compiled with geo-historical context yields a distinct (and genetically transmitted) population type.
46) What they have in common is that all of the genetic studies reviewed in the following section point to an Asian origin for all Native Americans, with the understanding that Asian populations, like modern Native American populations, have gone through microevolutionary changes since the time of the last common ancestor as well as population movement.
This type of investigation is necessary to answer important questions such as why butterflies evolve to use a particular host plant of set of host plants, and what phenotypic and microevolutionary alternatives are open to a population in exploiting the food plant resource.
One of the reasons why it has been difficult to bring microevolutionary experiments into classrooms is the obvious tradeoff between choosing an allele that is strongly selected against, such as a lethal allele, and choosing one that is easy to visualize.
My research may contribute to answering these questions, and perhaps increase knowledge of how algal blooms are affected by environmental changes and how the population dynamics of these algae appears in a microevolutionary perspective," she said.
While the mark of Ancient Java may not be present in any of the fossil series from the Willandra, establishing a clearer understanding of the microevolutionary processes that may have produced variation in Pleistocene Aboriginal Australians has the potential to inform the international community of the influence the extreme conditions of the Quaternary may have had on modern human morphology and diversity.
Predicting Microevolutionary Responses to Directional Selection on Heritable Variation.
Testing inferences about microevolutionary proceses by means of spatial autocorrelation analysis.