bioclimatic law

bioclimatic law

[¦bī·ō‚klī′mad·ik ′lȯ]
(ecology)
The law which states that phenological events are altered by about 4 days for each 5° change of latitude northward or longitude eastward; events are accelerated in spring and retreat in autumn.
References in periodicals archive ?
The general rule (officially Hopkins Bioclimatic Law) is that for each 100-foot gain in elevation, fall colors will arrive a day earlier than below.
THE FACTS BEHIND Fall Foliage: Learn how the life cycles of deciduous trees contain the key to the brilliant autumn colors that grace us annually
To compare the timing of such events at distant locations, Hopkins (1918) proposed his Bioclimatic Law, a rule-of-thumb formula to measure the average spring delay in days as one travels northward, eastward and upward in elevation.
Avian spring arrival differences in east-central Illinois, 1903-1922 and 1965-1987
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