Dose-response effects of light at night on the reproductive physiology of great tits (Parus major): Integrating morphological analyses with candidate gene expression.

Post hoc comparisons of estimated means and confidence intervals indicated that there was a slight, nonsignificant increase in testis volume between the dark group and the 0.5 lux group, and a much larger, highly significant increase between 0.5 and 1.5 lux and between 1.5 and 5 lux (Figure 2 a, Supporting Information Table S2 ).

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