[NatureNS] Duckweed

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Hi Nancy & All,
     I admit not having wondered about this but I think he makes a simple=
=20
process complicated. The air pockets to which he refers are presumably=20
intercellular spaces which in the absence of photosynthesis presumably=20
can become water filled. Starch has a specific gravity of 1.5 g/mL and,=20
in cooler weather starch will accumulate when respiration slows more=20
than photosynthesis and the submarine will sink. With warming, growth=20
resumes, respiration and starch consumption rates increase and  the=20
submarine rises.
Yt, DW, Kentville

------ Original Message ------
From: "nancy dowd" <nancypdowd@gmail.com>
To: naturens@chebucto.ns.ca
Sent: 3/10/2018 9:08:02 AM
Subject: [NatureNS] Duckweed

>This is an interesting article on Duckweed seasonal disappearance and=20
>reappearance in the Spring 2018 issue of Northern Woodlands Magazine.=20
>https://northernwoodlands.org/outside_story/article/duckweed-migration
>
>I had never really thought about where it went in Fall or how it=20
>re-emerges in Spring. Such an important floating pond plant in=20
>productive fresh water
>
>Nancy D
>
>Sent from my iPad
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<html><head><style id=3D"css_styles" type=3D"text/css"><!--blockquote.cite=
 { margin-left: 5px; margin-right: 0px; padding-left: 10px; padding-right:0p=
x; border-left: 1px solid #cccccc }
blockquote.cite2 {margin-left: 5px; margin-right: 0px; padding-left: 10px;=
 padding-right:0px; border-left: 1px solid #cccccc; margin-top: 3px; padding=
-top: 0px; }
a img { border: 0px; }
li[style=3D'text-align: center;'], li[style=3D'text-align: right;'] {  list=
-style-position: inside;}
body { font-family: Tahoma; font-size: 12pt;   }--></style></head><body><di=
v>Hi Nancy &amp; All,</div><div>=C2=A0 =C2=A0 I admit not having wondered a=
bout this but I think he makes a simple process complicated. The air pocket=
s to which he refers are presumably intercellular spaces which in the absen=
ce of photosynthesis presumably can become water filled. Starch has a speci=
fic gravity of 1.5 g/mL and, in cooler weather starch will accumulate when=
 respiration slows more than photosynthesis and the submarine will sink. Wit=
h warming, growth resumes, respiration and starch consumption rates increas=
e and =C2=A0the submarine rises.</div><div>Yt, DW, Kentville</div>
<div><br /></div>
<div>------ Original Message ------</div>
<div>From: "nancy dowd" &lt;<a href=3D"mailto:nancypdowd@gmail.com">nancypd=
owd@gmail.com</a>&gt;</div>
<div>To: <a href=3D"mailto:naturens@chebucto.ns.ca">naturens@chebucto.ns.ca=
</a></div>
<div>Sent: 3/10/2018 9:08:02 AM</div>
<div>Subject: [NatureNS] Duckweed</div><div><br /></div>
<div id=3D"xd49ec0a2bdf4406"><blockquote cite=3D"A593EEEC-616D-49BA-B70F-CA=
21003EAEDB@gmail.com" type=3D"cite" class=3D"cite2">
This is an interesting article on Duckweed seasonal disappearance and reapp=
earance in the Spring 2018 issue of Northern Woodlands Magazine. <a href=3D=
"https://northernwoodlands.org/outside_story/article/duckweed-migration">ht=
tps://northernwoodlands.org/outside_story/article/duckweed-migration</a><di=
v><br /></div><div>I had never really thought about where it went in Fall o=
r how it re-emerges in Spring.=C2=A0<span style=3D"background-color: rgba(2=
55, 255, 255, 0);">Such an important floating pond plant in productive fres=
h water=C2=A0</span><br /><div><br /></div><div>Nancy D<br /><br /><div id=
=3D"AppleMailSignature">Sent from my iPad</div></div></div></blockquote></d=
iv>
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