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cline

 
(klīn) pronunciation
n.
A gradual change in a character or feature across the distributional range of a species or population, usually correlated with an environmental or geographic transition.

[From Greek klīnein, to lean.]

clinal clin'al (klī'nəl) adj.

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cline, 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.


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What is a cline?

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A cline refers to geographic variation due to a gradient of climatic features. For example, a north-south gradient may include a range of temperature and a range of plant sizes, with taller plants at the southern end and shorter plants at the northern end.

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Cline

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pronunciation

IN BRIEF: n. - American geneticist who succeeded in transferring a functioning gene from one mouse to another (born in 1934).

Tutor's tip: In this "clime" (climate), a "cline" (gradual change in organisms of similar species often due to environmental or geographic changes) will occur as one continues the mountainous "climb" (to go up).

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Related topics:
–cline (suffix)
Classics (1995 Album by Patsy Cline)
chronocline (paleontology)

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