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. Author manuscript; available in PMC: 2010 Sep 1.
Published in final edited form as: Gen Comp Endocrinol. 2009 Jan 23;163(1-2):109–116. doi: 10.1016/j.ygcen.2009.01.003

Figure 6.

Figure 6

Effects of melatonin cycles on pinealectomized (PINX) house sparrows maintained in constant darkness (DD) and on intact sparrows in constant light (LL). PINX birds exhibited small testes (A), small high vocal center (HVC) (B), and small robust nuclei of the archipallium (RA) (C) irrespective of melatonin treatment. Intact sparrows in LL exhibited large testes (A). However, while birds receiving no melatonin or a short duration of melatonin exhibited large HVC and RA (B, C), birds receiving the long duration melatonin showed small HVC and RA even though their testes were large (from Cassone et al. 2008 with permission).