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Hi Rick & All, Aug 18, 2013
More precisely, natural selection is the selective tendency for =
non-survival of detrimental traits. It does not fit on a bumper sticker =
or in a 10 second sound bite nearly as well as 'survival of the fittest' =
but it is closer to the truth I think and helps account for much =
diversity. For example Viola cucullata has clubbed hairs on the lateral =
petals and V. septentrionalis has non-clubbed hairs and both are widely =
distributed. Both clubbed and non-clubbed have persisted because neither =
are detrimental.=20
Yt, Dave Webster, Kentville
----- Original Message -----=20
From: Rick Whitman=20
To: naturens=20
Sent: Saturday, August 17, 2013 7:30 PM
Subject: Re: [NatureNS] caterpillar question- tuft control?
I feel that you are under-estimating the power of natural selection =
i.e. if it benefits the organism, in terms of survival, it just might =
happen. I'm confident they are nothing more than highly evolved "hairs", =
that can be moved in a defensive manner.
Best, Rick.
On Sat, Aug 17, 2013 at 6:41 PM, nancy dowd <nancypdowd@gmail.com> =
wrote:
A week ago I took a picture of this fast-moving and impressive, =
albeit
common, White-Marked Tussock Moth Caterpillar (Orgyia leucostigma).
Pls correct the ID if wrong:
http://www.flickr.com/photos/92981528@N08/9501075283/
Then it reared its head up at me and waved its front tufts in the =
air.
Closeup of front end here:
http://www.flickr.com/photos/92981528@N08/9503879386/
Details are in photo captions.
I thought caterpillar tufts and hairs were passive structures, =
moving
only as the body moves. But they must have muscle control to wave
independently of one another like that. Are they a modified antennae
or leg or? Can't find anything out searching the internet or in the
books I have so I will try here.
Nancy
--=20
Rick Whitman
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.3392 / Virus Database: 3211/6585 - Release Date: =
08/17/13
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<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.23515">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV>Hi Rick & All, =
=20
=
Aug=20
18, 2013</DIV>
<DIV> More precisely, natural selection is the =
selective=20
tendency for non-survival of detrimental traits. It does not fit on a =
bumper=20
sticker or in a 10 second sound bite nearly as well as 'survival of the =
fittest'=20
but it is closer to the truth I think and helps account for much =
diversity. For=20
example Viola cucullata has clubbed hairs on the lateral petals and =
V.=20
septentrionalis has non-clubbed hairs and both are widely =
distributed. Both=20
clubbed and non-clubbed have persisted because neither are=20
detrimental. </DIV>
<DIV>Yt, Dave Webster, Kentville</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=3Ddendroica.caerulescens@gmail.com=20
href=3D"mailto:dendroica.caerulescens@gmail.com">Rick Whitman</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</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, August 17, 2013 =
7:30=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [NatureNS] =
caterpillar=20
question- tuft control?</DIV>
<DIV><BR></DIV>
<DIV dir=3Dltr>I feel that you are under-estimating the power of =
natural=20
selection i.e. if it benefits the organism, in terms of survival, it =
just=20
might happen. I'm confident they are nothing more than highly evolved =
"hairs",=20
that can be moved in a defensive manner.
<DIV>Best, Rick.</DIV></DIV>
<DIV class=3Dgmail_extra><BR><BR>
<DIV class=3Dgmail_quote>On Sat, Aug 17, 2013 at 6:41 PM, nancy dowd =
<SPAN=20
dir=3Dltr><<A href=3D"mailto:nancypdowd@gmail.com"=20
target=3D_blank>nancypdowd@gmail.com</A>></SPAN> wrote:<BR>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; =
PADDING-LEFT: 1ex"=20
class=3Dgmail_quote>A week ago I took a picture of this fast-moving =
and=20
impressive, albeit<BR>common, White-Marked Tussock Moth Caterpillar =
(Orgyia=20
leucostigma).<BR>Pls correct the ID if wrong:<BR><A=20
href=3D"http://www.flickr.com/photos/92981528@N08/9501075283/"=20
=
target=3D_blank>http://www.flickr.com/photos/92981528@N08/9501075283/</A>=
<BR><BR>Then=20
it reared its head up at me and waved its front tufts in the =
air.<BR>Closeup=20
of front end here:<BR><A=20
href=3D"http://www.flickr.com/photos/92981528@N08/9503879386/"=20
=
target=3D_blank>http://www.flickr.com/photos/92981528@N08/9503879386/</A>=
<BR>Details=20
are in photo captions.<BR><BR>I thought caterpillar tufts and hairs =
were=20
passive structures, moving<BR>only as the body moves. But they must =
have=20
muscle control to wave<BR>independently of one another like that. =
Are they a=20
modified antennae<BR>or leg or? Can't find anything out searching =
the=20
internet or in the<BR>books I have so I will try here.<BR><SPAN=20
class=3DHOEnZb><FONT=20
color=3D#888888><BR>Nancy<BR></FONT></SPAN></BLOCKQUOTE></DIV><BR><BR =
clear=3Dall>
<DIV><BR></DIV>-- <BR>Rick Whitman<BR></DIV><A></A>
<P align=3Dleft color=3D"#000000" avgcert??>No virus found in this=20
message.<BR>Checked by AVG - <A