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Hi Dave,
It all seemed counter-intuitive to me at first when thought of in terms of a
predator-prey relationship. But as the article seems to suggest, perhaps the
cicada cycle has an environmental effect that impacts bird populations in a
way that is not at all related to birds eating cicadas. I saw this article
referred to on another bird listserv that was having a discussion similar to
the one held here recently concerning the apparent lack of a dawn chorus in
some regions while observers in other areas reported that all seems normal.
According to Andrew Hebda on the CBC recently, Nova Scotia is having a
cicada boom this year. Perhaps those who are noticing a decline in birds in
their region should also be listening for cicadas.
John
From: naturens-owner@chebucto.ns.ca [mailto:naturens-owner@chebucto.ns.ca]
On Behalf Of David & Alison Webster
Sent: June 19, 2013 18:40
To: naturens@chebucto.ns.ca
Subject: Re: [NatureNS] Dawn Chorus and Cicadas
Hi John & All, June 19, 2013
The 'mystery' of there being fewer birds where cicadas are present
disappears in an apocalyptic inversion if this relationship is viewed as a
case of 'cicadas being present where birds are less abundant'.
If the cicada-eating bird population in an area is high enough then
cicadas will be eaten shortly after emergence (when their exoskeleton is
still relatively soft) leading to many birds and few or no cicadas. If the
opposite holds; low population of cicada-eating birds in an area then many
cicadas will survive leading to few birds and many cicadas.
Yt, Dave Webster
----- Original Message -----
From: John Kearney <mailto:john.kearney@ns.sympatico.ca>
To: naturens@chebucto.ns.ca
Sent: Wednesday, June 19, 2013 4:27 PM
Subject: [NatureNS] Dawn Chorus and Cicadas
Reference to an interesting article relating the disappearance of birds to
Cicada blooms
http://blogs.discovermagazine.com/crux/2013/06/18/the-cicada-paradox#.UcIE2d
jNkpZ
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class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Hi Dave,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>It all seemed counter-intuitive to me at first when thought of in =
terms of a predator-prey relationship. But as the article seems to =
suggest, perhaps the cicada cycle has an environmental effect that =
impacts bird populations in a way that is not at all related to birds =
eating cicadas. I saw this article referred to on another bird listserv =
that was having a discussion similar to the one held here recently =
concerning the apparent lack of a dawn chorus in some regions while =
observers in other areas reported that all seems normal. According to =
Andrew Hebda on the CBC recently, Nova Scotia is having a cicada boom =
this year. Perhaps those who are noticing a decline in birds in their =
region should also be listening for cicadas.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>John<o:p></o:p></span></p><p class=3DMsoNormal><span =
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D'><o:p> </o:p></span></p><div><div =
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0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US =
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om:</span></b><span lang=3DEN-US =
style=3D'font-family:"Tahoma","sans-serif";mso-fareast-language:EN-CA'> =
naturens-owner@chebucto.ns.ca [mailto:naturens-owner@chebucto.ns.ca] =
<b>On Behalf Of </b>David & Alison Webster<br><b>Sent:</b> June 19, =
2013 18:40<br><b>To:</b> nat