the amount of time per day that an organism is exposed to light (Morris 1992).
natural or artificial cycle of light and darkness alternation to which living organisms may be exposed NOTE - For instance, for the natural cycle of light at the time of the equinoxes, the ratio of light duration (L = 12 h) to darkness duration (D = 12 h) is expressed as LD 12 :12.
<ecology> Recurring cycle of light and dark periods. The natural photoperiod is approximately 24 hours, and the ratio of light to dark hours slowly changes over the course of a year. In controlled experiments, the photoperiod is usually (but not necessarily) retained at 24 hours, and the light:dark ratio is typically constant. ... (09 Oct 199...
(fo´to-pēr″e-әd) the period of time per day that an organism is exposed to daylight (or to artificial light). adj., photoperiod´ic., adj.
Light period of a day.
The duration of the daylight period.
The daily cycle of light and darkness. E.g 18/6, 18 hours of light and 6 hours of dark would be the photoperiod.
the relationship between the length of light and dark in a 24-hour period.
A ratio of hours of light to the hours of dark.
The length of time per day that an animal is exposed to natural or artificial light.
photoperiod 1. The length of a day. 2. The amount of time that an organism is exposed to daylight.
The amount of a 24-hour day in which birds are exposed to light.
Length of day (or length of period that that artificial light is provided). This also can be expressed as a ratio of daylight to darkness.
Length of day (or length of period artificial light is provided). Also expressed as a ratio of daylight to darkness.
The relationship between the length of light and dark in a 24 hour period.
The relationship between the length of light and dark in a 24 hour period.