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Figure 3 | Journal of Circadian Rhythms

Figure 3

From: Effects of altitude on circadian rhythm of adult locomotor activity in Himalayan strains of Drosophila helvetica

Figure 3

Curves passing through mean values ( N = 22) of the natural light intensity obtained at the breeding site of the haH strain (A) at Hemkund-Sahib (4,121 m) and the laH strain of D. helvetica (B) at Birahi (1,132 m). Data were collected from 1 to 21 July 2005 when the natural photoperiod was ~14 h and the ambient temperature was maintained at 20 ± 0.5°C, (i.e., the CT regime). The haH flies began activity ~4.5 h after sunrise (SR) when the light intensity was ~79,000 lux while the laH flies began activity ~1 h before sunrise when the light intensity was ~1 lux as in the NFT regime. The haH flies terminated activity ~1 h after sunset (SS) when light intensity was ~1 lux unlike that in the NFT regime, while the laH flies terminated activity ~0.4 h after sunset when the light intensity was ~30 lux as that in the NFT regime. Other symbols as in Figure 1.

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