[NatureNS] Kelp flies

Date: Wed, 21 Feb 2007 09:22:59 -0400
Thread-Topic: Kelp flies
Thread-Index: AcdVu2g7wcX7xOM7RAuusQKzR2ZLIg==
From: "Sabine, Dwayne \(DNR/MRN\)" <Dwayne.Sabine@gnb.ca>
To: <naturens@chebucto.ns.ca>
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Original-Recipient: rfc822;"| (cd /csuite/info/Environment/FNSN/MList; /csuite/lib/arch2html)"

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I have seen kelp flies very active (scattering away as I walked, rather
than just crawling about) along the Bay of Fundy in late February when
temperatures were -10C or thereabouts.  However, this was always on
sunny, windless days when there was no snow on the wrack, and radiant
heating from the blackened seaweed created a layer of warm air directly
overhead - the air temperature where the flies were active would have
been above zero.  If a bit of breeze is added to the mix, breaking up
that warm layer, the temperature must be quite a bit warmer (perhaps a
few degrees below zero) before they seem to be as active.

Dwayne



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<P><FONT SIZE=3D2 FACE=3D"Arial">I have seen kelp flies very active =
(scattering away as I walked, rather than just crawling about) along the =
Bay of Fundy in late February when temperatures were -10C or =
thereabouts.&nbsp; However, this was always on sunny, windless days when =
there was no snow on the wrack, and radiant heating from the blackened =
seaweed created a layer of warm air directly overhead - the air =
temperature where the flies were active would have been above =
zero.&nbsp; If a bit of breeze is added to the mix, breaking up that =
warm layer, the temperature must be quite a bit warmer (perhaps a few =
degrees below zero) before they seem to be as active.</FONT></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Dwayne</FONT>
</P>
<BR>

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