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Hi Again, Apr 20, 2012
In my earlier post I forgot the mention that the commentary in the =
top URL has some significant misinformation i.e. "Pesticides get more =
concentrated as they move up the food chain..."; a half truth and =
therefore a half falsehood.
Lipid-soluble pesticides are prone to bioaccumulation because they =
partition into lipids and are therefore less exposed to metabolic =
breakdown but even lipid-soluble pesticides require a multistage food =
chain to have much effect.=20
Shortly after this consequence of lipid solubility was recognized, a =
great deal of effort was expended to develop pesticides that were not =
prone to bioaccumulation and the earlier lipid-soluble ones were largely =
retired.
Yt, Dave Webster, Kentville
----- Original Message -----=20
From: James Churchill=20
To: naturens@chebucto.ns.ca=20
Sent: Thursday, April 19, 2012 9:27 AM
Subject: Re: [NatureNS] 50th Anniversary of Silent Spring
Hi folks,=20
Hard to say if she would have a Twitter account...but she might tweet =
the link to this article:
=
http://news.sciencemag.org/sciencenow/2012/04/clues-to-species-decline-bu=
ried.html
Clues to Species Decline Buried in Pile of Bird Excrement
Link to the original paper by Nocera et al. in Proceedings of the =
Royal Society B:
=
http://rspb.royalsocietypublishing.org/content/early/2012/04/15/rspb.2012=
.0445
Excerpt from abstract:
"We argue that DDT applications decimated Coleoptera populations and =
dramatically altered insect community structure by the 1960s, triggering =
nutritional consequences for swifts and other aerial insectivores"
cheers,=20
ps. as I was signing off on this email, Chris Kennedy's email of the =
same topic just came through - same wavelength Chris.
On Thu, Apr 19, 2012 at 8:28 AM, David & Alison Webster =
<dwebster@glinx.com> wrote:
Hi John & All, Apr 19, 2012
For starters she would have thanked Bruce MacKinnon for today's =
political cartoon; a classic if I ever saw one.
Yt, Dave Webster, Kentville
----- Original Message -----=20
From: John Kearney=20
To: naturens@chebucto.ns.ca=20
Sent: Wednesday, April 18, 2012 8:41 PM
Subject: [NatureNS] 50th Anniversary of Silent Spring
Rachel Carson in her book, Silent Spring, exposed the disregard =
for the environment, human health, and wildlife in the pursuit of =
profit. Some would argue that she is directly responsible for the =
establishment of environmental protection agencies around the world. As =
these agencies are now being dismantled or gutted, as our aerial =
insectivores and many other bird species are dramatically declining, I =
would like to honor her memory by asking: What would Rachel Carson write =
today if she was still here.
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--=20
James Churchill
Kentville, Nova Scotia
Email: jameslchurchill@gmail.com
Phone (h): (902) 681-2374
Skype: jameslchurchill
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04/18/12
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<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2>Hi Again, =20
Apr 20, 2012</FONT></DIV>
<DIV><FONT size=3D2> In my earlier post I forgot the =
mention=20
that the commentary in the top URL has some significant misinformation =
i.e.=20
"Pesticides get more concentrated as they move up the food chain..."; a =
half=20
truth and therefore a half falsehood.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> <STRONG>Lipid-soluble</STRONG> =
pesticides=20
are prone to bioaccumulation because they partition into lipids =
and are=20
therefore less exposed to metabolic breakdown but=20
even lipid-soluble pesticides require a multistage food=20
chain to have much effect. </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2> Shortly after this consequence of =
lipid=20
solubility was recognized, a great deal of effort was expended to =
develop=20
pesticides that were not prone to bioaccumulation and the earlier =
lipid-soluble=20
ones were largely retired.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Yt, Dave Webster, Kentville</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
<A title=3Djameslchurchill@gmail.com=20
href=3D"mailto:jameslchurchill@gmail.com">James Churchill</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dnaturens@chebucto.ns.ca=20
href=3D"mailto:naturens@chebucto.ns.ca">naturens@chebucto.ns.ca</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, April 19, 2012 =
9:27=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [NatureNS] 50th =
Anniversary=20
of Silent Spring</DIV>
<DIV><BR></DIV>
<DIV>Hi folks, <BR>Hard to say if she would have a Twitter =
account...but she=20
might tweet the link to this article:</DIV>
<DIV><A=20
=
href=3D"http://news.sciencemag.org/sciencenow/2012/04/clues-to-species-de=
cline-buried.html">http://news.sciencemag.org/sciencenow/2012/04/clues-to=
-species-decline-buried.html</A></DIV>
<DIV>
<H1 id=3Dpage-title class=3D"asset-name entry-title">Clues to Species =
Decline=20
Buried in Pile of Bird Excrement</H1></DIV>
<DIV>Link to the o