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 ?
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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