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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 ?
metropolitan area, the book outlines the terms on which Cline could begin her music career.
Cline had been with the Division of Financial Institutions in 1984 before taking a position with The Huntington National Bank (NASDAQ: HBAN).
How you get your project in the mix is very important,'' Cline said.
Cline will oversee Towne Park's business development and growth strategies focusing primarily on prospective hotel business and Towne Park's national accounts program.
Cline established a private practice as an OB/GYN in New York City.
Cline is the Chairman of the Breast leadership program at Marietta Memorial Hospital.
CUTLINE: Becky Barta has portrayed Patsy Cline in 20 productions of "Always .
Practice Personalities for Adults, and The Amazing Incredible Shrinking Violin), Thornton Cline is an in-demand teacher, speaker, clinician, performer and songwriter.
This website design was completed with online shopping, merchant services, and back-end administration by the staff at Cline Computers.
We are extremely pleased to have both Mr Cline and Mr.
and Israel and reports directly to The Cline Group's CEO Josh Cline.
Playing Cline in this two-woman show - with Emily Gilbert as Cline's real-life fan and friend, Louise Seger - is not play but work.