Changing summer sounds

Dog Day Cicada Hatching, licensed for use under the creative commons.

I’ve only just noticed a change since our move 100 kilometres south-west from Guelph to London: there’s a different Cicada that makes up the summer-time chorus.

I’m very used to the song of the Dog-Day Cicada (Tibicen canicularis): it’s song has made up the entirety of my summer aural landscape in Southern Ontario. Now that male Cicadas have started to call (I heard my first Cicada calling on July 11th this year), I’m not just hearing the constant sound that characterizes the Dog-Day’s call. Rather, I’m hearing a loud, buzzy, pulsating call. After a little work, I think I’m hearing male Scissor-grinder Cicadas (Tibicen pruinosa). Neat thing is this species is not common in Guelph, but certainly common enough here in London. Looking at a range map, they’re shown to be in Michigan near the Canadian border, but not shown to be in SW Ontario. Perhaps individuals are slowly moving North due to climate change?

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