A photoperiod of 12 hours is comparable to that experienced in nature, since Borneo lies on the equator.
32.
This may be because fish in milder climates can begin reproductive investment earlier, putting their energy into photoperiod.
33.
In the spring, when the photoperiod increases ( more daylight ), the male canary's testes grow.
34.
In the laboratory, an artificial short day-long night summer photoperiod caused gonadal shrinkage in Great Basin pocket mice.
35.
Prior to the transplantation procedure, the donor birds were entrained to a 12 : 12 light : dark photoperiod cycle.
36.
The Japanese quail mainly eats and drinks at the beginning and end of the day : behavior shown to closely follow the photoperiod.
37.
After completion of the cold treatment, the grafts were moved into the greenhouse with an 18-hour photoperiod until late October.
38.
But, if an extended photoperiod is provided for Sitka spruce, seedlings become unacceptably tall by the end of the first growing season.
39.
Photoperiodism is a plant s response or capacity to respond to photoperiod, a recurring cycle of light and dark periods of constant length.
40.
Artificial extension of the photoperiod in the northern Lake States greatly increased height increment of white and black spruces in the second growing season.
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