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in biology, any gradual change in a particular characteristic of a population of organisms from one end of the geographical range of the population to the other. Gradients of characteristics usually accompany, and are responses to, environmental gradients; for example, a mountain range features gradients from top to bottom such as a temperature gradient (colder to warmer) and a humidity gradient (wetter to drier). They may also reflect patterns of individual migration or gene flow. In species of birds and mammals, there is usually a cline in body size, with smaller individuals in warm climates and larger individuals tending to be found in colder climates.



in biology, a gradual increase or decrease (quantitative gradient) of some character or property in populations in connection with marked change in physical geographic factors. A cline usually develops when a large area is more or less uniformly populated by a particular species and the populations and their groups are not separated by rigid isolating barriers. A cline provides an advantage in natural selection because it allows adjustment to any direction of change in the corresponding physical geographic factors.

A cline may also develop as a result of the rapid dispersal of a species.


Timofeev-Resovskii, N. V., N. N. Vorontsov, and A. V. Iablokov. Kratkii ocherk teorii evoliutsii. Moscow, 1969. Pages 163, 164, 171, 176.


A graded series of morphological or physiological characters exhibited by a natural group (as a species) of related organisms, generally along a line of environmental or geographic transition.


Patsy, original name Virginia Patterson Hensley. 1932--63, US country singer; her bestselling records include "Walking After Midnight", "I Fall to Pieces", and "Leavin' On Your Mind".
References in periodicals archive ?
There were significant limitations to how a criminal case could proceed against Cline, but ultimately he admitted to his actions and to intentionally misleading investigators," he added.
Established in 1982, Cline Family Cellars is a Sonoma, California based winery that produces awarding-winning Rhone-style wines and Zinfandels, as well as classic Sonoma County varietals including Pinot Noir, Chardonnay, Pinot Gris and Merlot.
Cline had been with the Division of Financial Institutions in 1984 before taking a position with The Huntington National Bank (NASDAQ: HBAN).
All of Cline Wood's employees and leadership, including founders John Cline and Mike Wood and CEO Carol Barnett, are joining MMA's upper Midwest region, which is under a leadership of regional CEO Bill Jeatran.
Jocelyn Neal's "'Nothing But a Little Ole Pop Song': Patsy Cline's Music Style and the Evolution of Genre in the 1950s" shows how the current acceptance of Cline as an "authentic" country musician clashes with the sounds on her hit songs, recordings that fans of "traditional" honky-tonk initially rejected.
Cline said the unidentified man offered to drive her home after she became intoxicated while drinking at a local tavern, police Sgt.
Cline is personally present on every jobsite--in the trenches working right alongside his crews in addition to supervising their progress.
The plot allegedly involved a letter sent to Cline that threatened the coal tycoon's family unless he gave over 13 million dollars.
Cline has 16 years of human resources experience and she has worked in a variety of industries.
The endowment creates the Christopher Cline Chair in Orthopaedic Surgery, and will qualify for matching funds from the state Research Trust Fund, making the total benefit to WVU $4 million.
Rob Cline took on the job of managing the $52 million, 165,000-square-foot Town Toyota Center for developer Global Entertainment Corp.