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Index of Subjects This is a multi-part message in MIME format. ------=_NextPart_000_00C7_01CE7D47.B94CC810 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 ------=_NextPart_000_00C7_01CE7D47.B94CC810 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <HTML><HEAD></HEAD> <BODY dir=3Dltr> <DIV dir=3Dltr> <DIV style=3D"FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt"> <DIV>Nancy,</DIV> <DIV> 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> 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> </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> </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> ------=_NextPart_000_00C7_01CE7D47.B94CC810--
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