[NatureNS] carnivorous plants threated by excess N

From: "Dusan Soudek" <soudekd@ns.sympatico.ca>
To: <naturens@chebucto.ns.ca>
References: <CALrKMTeqO1cUxjhU-0aMwDGsnfbg_sHUHbCDK_gc-hWLO7hr9g@mail.gmail.com>
Date: Wed, 10 Jul 2013 08:30:24 -0300
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Nancy,
   a very interesting topic. By the same token, are all nitrogen-fixing =
plants, such as our alders and clovers, in decline because of nitrate =
excess? My immediate reaction is that alders are as common along our =
waterways as always. But could they be abandoning their symbiotic =
nitrogen-fixing bacteria?
   Dusan Soudek

From: nancy dowd=20
Sent: Wednesday, July 10, 2013 7:10 AM
To: naturens=20
Subject: [NatureNS] carnivorous plants threated by excess N

At the end of Chapter 2 (Green Tyrannosaurs) author Steve Jones =
(Darwin's Island, Abacus, 2010) observes that carnivorous plants are =
threatened by excess human-sourced nitrogen in the environment. His =
argument goes as follows:


Carnivorous plants (pitcher plants, sundews, bladderworts) exist in low =
nutrient, acidic wetlands b/c they are able to absorb nitrogen from =
their insect prey. Other conventional photosynthesizing plants are =
unable to thrive in these environments as they cannot absorb sufficient =
N through their roots so pose no competition to the bog plants. But this =
is changing. Where plant-friendly N has enriched the bog from fertilizer =
runoff or exhaust etc carnivorous plants are switching to photosynthesis =
(Pitcher Plants produce more leaves, Sundews no longer need sticky =
droplets to snare prey and bladderworts lose their bladders). If they =
can now more easily live by that means so can other plants who will move =
in and take over the bog ousting the insect-eaters.


This article touches on the subject =
http://northernwoodlands.org/outside_story/article/nitrogen-pollution-emp=
ties-the-pitcher-plant


What about observations from around here? Has anyone who has had a long =
term relationship with a bog noticed changes? Or studies conducted in =
our region?


Nancy

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<HTML><HEAD></HEAD>
<BODY dir=3Dltr>
<DIV dir=3Dltr>
<DIV style=3D"FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt">
<DIV>Nancy,</DIV>
<DIV>&nbsp;&nbsp; a very interesting topic. By the same token, are all=20
nitrogen-fixing plants, such as our alders and clovers, in decline =
because of=20
nitrate excess? My immediate reaction is that alders are as common along =
our=20
waterways as always. But could they be abandoning their symbiotic=20
nitrogen-fixing bacteria?</DIV>
<DIV>&nbsp;&nbsp; Dusan Soudek</DIV>
<DIV=20
style=3D"FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; =
COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: =
none">
<DIV style=3D"FONT: 10pt tahoma">
<DIV>&nbsp;</DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dnancypdowd@gmail.com=20
href=3D"mailto:nancypdowd@gmail.com">nancy dowd</A> </DIV>
<DIV><B>Sent:</B> Wednesday, July 10, 2013 7:10 AM</DIV>
<DIV><B>To:</B> <A title=3Dnaturens@chebucto.ns.ca=20
href=3D"mailto:naturens@chebucto.ns.ca">naturens</A> </DIV>
<DIV><B>Subject:</B> [NatureNS] carnivorous plants threated by excess=20
N</DIV></DIV></DIV>
<DIV>&nbsp;</DIV></DIV>
<DIV=20
style=3D"FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; =
COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: =
none">
<DIV dir=3Dltr>
<DIV>
<DIV>
<DIV>
<DIV>At the end of Chapter 2 (Green Tyrannosaurs) author Steve Jones =
(Darwin's=20
Island, Abacus, 2010) observes that carnivorous plants are threatened by =
excess=20
human-sourced nitrogen in the environment. His argument goes as=20
follows:<BR><BR></DIV>Carnivorous plants (pitcher plants, sundews, =
bladderworts)=20
exist in low nutrient, acidic wetlands b/c they are able to absorb =
nitrogen from=20
their insect prey. Other conventional photosynthesizing plants are =
unable to=20
thrive in these environments as they cannot absorb sufficient N through =
their=20
roots so pose no competition to the bog plants. But this is changing. =
Where=20
plant-friendly N has enriched the bog from fertilizer runoff or exhaust =
etc=20
carnivorous plants are switching to photosynthesis (Pitcher Plants =
produce more=20
leaves, Sundews no longer need sticky droplets to snare prey and =
bladderworts=20
lose their bladders). If they can now more easily live by that means so =
can=20
other plants who will move in and take over the bog ousting the=20
insect-eaters.<BR><BR></DIV>This article touches on the subject <A=20
href=3D"http://northernwoodlands.org/outside_story/article/nitrogen-pollu=
tion-empties-the-pitcher-plant">http://northernwoodlands.org/outside_stor=
y/article/nitrogen-pollution-empties-the-pitcher-plant</A><BR><BR></DIV>W=
hat=20
about observations from around here? Has anyone who has had a long term=20
relationship with a bog noticed changes? Or studies conducted in our=20
region?<BR><BR></DIV>Nancy<BR></DIV></DIV></DIV></DIV></BODY></HTML>

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