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Fig. 4 | Frontiers in Zoology

Fig. 4

From: Seasonality at the equator: isotope signatures and hormonal correlates of molt phenology in a non-migratory Amazonian songbird

Fig. 4

Seasonal changes of testosterone levels in males. The seasonal peak of testosterone occurs during the dry season. The red line and filled circles shows means (+/− SE) of testosterone in males over the five sampling periods (April, July, October 2011, and January, February 2012). Red open circles indicate male individual testosterone levels. The blue line indicates the rainfall in mm represented as the monthly values from April 2011 until February 2012. The red shading indicates the period during which seasonal dawn-song occurs [36]

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