City lights create sexual early birds
Male blackbirds exposed to nocturnal illumination ready to mate sooner in spring
By Susan Milius, 15:30 PM January 8, 2013
SAN FRANCISCO — City lights can deliver male birds into reproductive readiness weeks ahead of schedule.
Male European blackbirds monitored in a lab under simulated city lighting started secreting increased levels of testosterone and growing their sexual organs up to a month earlier in the spring than birds kept in country-style darkness, Davide Dominoni of the Max Planck Institute for Ornithology in Radolfzell, Germany, reported January 6 at the annual meeting of the Society for Integrativ...
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