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Figure 3 | Frontiers in Zoology

Figure 3

From: Control of annual reproductive cycle in the subtropical house sparrow (Passer domesticus): evidence for conservation of photoperiodic control mechanisms in birds

Figure 3

Mean (±SE) testis volume (a-c) and follicle diameter (d-f) of house sparrows (n = 5 – 9 each) procured from the wild every month, and transferred to 16 hours light :8 hours darkness (16L:8D) from December 2002 to November 2003 for a period of 17 to 26 weeks. Data are plotted in groups of 4 months for the sake of clarity. There was a time-of-year effect on the gonadal response to 16L:8D, which suggested that physiological mechanisms underlying reproductive cycle in house sparrows underwent seasonal changes.

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