[NatureNS] directional mayfly

From: David & Alison Webster <dwebster@glinx.com>
To: naturens@chebucto.ns.ca
References: <CALrKMTe48r60dSzdiFkJ_Jk1h=4-oh2uDL-zD890kp-oQbB79w@mail.gmail.com>
Date: Fri, 19 Jul 2013 18:19:15 -0300
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Just a guess but aquatic insects, at mating/egg laying stage, tend to be 
attracted by polarized light because this means open water.
Yt, Dave Webster, Kentville
----- Original Message ----- 
From: "nancy dowd" <nancypdowd@gmail.com>
To: "naturens" <naturens@chebucto.ns.ca>
Sent: Friday, July 19, 2013 2:44 PM
Subject: [NatureNS] directional mayfly


> This mayfly (Ephemeroptera) landed on my shirt Wednesday evening. It
> is possibly one of the burrowing mayflies (Ephemeridae). Perhaps
> someone knows its ID:
> http://www.flickr.com/photos/92981528@N08/9319239733/
>
> I nudged it onto a paper to show its 2 tail filaments using the flash:
> http://www.flickr.com/photos/92981528@N08/9319237905/
>
> The really interesting thing about this mayfly was how it maintained
> its direction. Every time I moved the paper for a better view it would
> immediately move back to its original bearing (approximately south)
> just like a compass needle. I have no idea what it could be orienting
> towards (direction, sun, wind, smell) or if this is normal for
> mayflies and perhaps other insects that emerge en masse to breed (such
> as flying ants).
>
> Nancy
>
>
> -----
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