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Y207DQoJbWFyZ2luLWJvdHRvbTou --Apple-Mail-4A833BCE-23CD-4D1E-84A2-1776EFC16DC3 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable I wonder if large amounts of guano also have a smothering effect? Nancy Sent from my iPad > On Mar 29, 2018, at 4:00 PM, Laviolette, Lance <lance.laviolette@lmco.com>= wrote: >=20 > Hi David, > =20 > You are far more qualified than I am to understand the soil chemistry invo= lved. Guano is uric acid so I=E2=80=99ll hypothesis that the acidic componen= t damages the trees directly. > =20 > Nick Hill might also be able to comment on the effect that gulls have had o= n plant community succession on Brier Island. I=E2=80=99d be interested to k= now if it is the soil chemistry of former colony locations suppresses shrub a= nd tree growth or if there is active destruction of young growth by gulls. > =20 > Cheers, > =20 > Lance > =20 > From: naturens-owner@chebucto.ns.ca [mailto:naturens-owner@chebucto.ns.ca]= On Behalf Of David > Sent: March 29, 2018 1:45 PM > To: naturens@chebucto.ns.ca > Subject: EXTERNAL: Re[2]: [NatureNS] Cormorants and Great Blues > =20 > Hi Lance & All, > I am guessing that tree death is due to winter kill of growth which, d= ue to excess N, failed to harden off. But, does guano also kill woody perenn= ials where winter kill is not possible (too warm) ? > Yt, DW, Kentville=20 > =20 > ------ Original Message ------ > From: "Laviolette, Lance" <lance.laviolette@lmco.com> > To: "naturens@chebucto.ns.ca" <naturens@chebucto.ns.ca> > Sent: 3/29/2018 12:26:34 PM > Subject: RE: [NatureNS] Cormorants and Great Blues > =20 > Hi Everyone, > =20 > That=E2=80=99s the usual cycle of Great Blue Heron and Double-creasted Cor= morant nesting on Nova Scotia Islands. > =20 > Grass > Brambles> Shrubs > Trees > double-crested cormorants/great blue he= rons > Trees > Shrubs/brambles > Grass > =20 > Guano is a great fertilizer, rich in nitrogen, phosphate and potassium, bu= t like any fertilizer, too much is not a good thing and as everyone who has v= isited a cormorant or great blue heron colony knows, they produce a lot of g= uano. > =20 > The Great Blue Herons move to start the process on another treed island on= ce the trees are all killed and can no longer support a nest structure (alth= ough I did come across Great Blue Herons nesting on an island in a lake in Y= armouth County once). > =20 > The Grass stage is prolonged as long as gulls and/or the cormorants start n= esting on the ground. Common Eiders can be in the mix at several stages. > =20 > The Grass stage ends and plant succession begins when these ground nesting= species are forced to move off the island and erosion hasn=E2=80=99t reduce= d the island to mostly bare rock. > =20 > Cheers, > =20 > Lance > =20 > Lance Laviolette > Glen Robertson, Ontario > =20 > =20 > =20 > From: naturens-owner@chebucto.ns.ca [mailto:naturens-owner@chebucto.ns.ca]= On Behalf Of John and Nhung > Sent: March 29, 2018 10:36 AM > To: naturens@chebucto.ns.ca > Subject: EXTERNAL: RE: [NatureNS] Cormorants and Great Blues > =20 > Here=E2=80=99s s story from before your time, John K.!=20 > =20 > Years ago, the island in mid-Yarmouth Harbour was well-treed. Mighta been= back in the =E2=80=9970=E2=80=99s that cormorants started to get more abund= ant and really liked that island. Lotsa bushes on the island now; all the s= pruce trees died out. > =20 > From: naturens-owner@chebucto.ns.ca [mailto:naturens-owner@chebucto.ns.ca]= On Behalf Of Nick Hill > Sent: March 29, 2018 10:21 AM > To: naturens@chebucto.ns.ca > Subject: Re: [NatureNS] Cormorants and Great Blues > =20 > John, are double-crested cormorants becoming a disturbance and habitat enr= ichment problem here in NS..similar in a way to herring gulls? > Nick > =20 > On Thu, Mar 29, 2018 at 10:02 AM, John Kearney <john.kearney@ns.sympatico.= ca> wrote: > Hi All, > Two Double-crested Cormorants and six Great Blue Herons arrived at the Joh= ns Island nesting colony in Yarmouth Harbour this morning. There seemed to b= e more cormorants crouching in grass, perhaps recovering from their journey.= I couldn=E2=80=99t tell for sure. > None of these were there yesterday when I checked. > John >=20 > Sent from my iPhone >=20 >=20 > =20 > -- > Dr. N.M.Hill > Fern Hill Institute of Plant Conservation > 424 Bentley Road, Berwick, NS, B0P 1E0 >=20 > phone 902-698-0416 --Apple-Mail-4A833BCE-23CD-4D1E-84A2-1776EFC16DC3 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D= utf-8"></head><body dir=3D"auto">I wonder if large amounts of guano also hav= e a smothering effect?<div><br></div><div>Nancy<br><br><div id=3D"AppleMailS= ignature">Sent from my iPad</div><div><br>On Mar 29, 2018, at 4:00 PM, Lavio= lette, Lance <<a href=3D"mailto:lance.laviolette@lmco.com">lance.laviolet= te@lmco.com</a>> wrote:<br><br></div><blockquote type=3D"cite"><div> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8"> <meta name=3D"Generator" content=3D"Microsoft Word 15 (filtered medium)"> <style><!-- /* Font Definitions */ @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4;} @font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4;} @font-face {font-family:"Baskerville Old Face"; panose-1:2 2 6 2 8 5 5 2 3 3;} @font-face {font-family:Tahoma; panose-1:2 11 6 4 3 5 4 4 2 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0cm; margin-bottom:.0001pt; font-size:12.0pt; font-family:"Times New Roman",serif;} a:link, span.MsoHyperlink {mso-style-priority:99; color:blue; text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {mso-style-priority:99; color:purple; text-decoration:underline;} span.EmailStyle17 {mso-style-type:personal-reply; font-family:"Calibri",sans-serif; color:#1F497D;} .MsoChpDefault {mso-style-type:export-only; font-size:10.0pt;} @page WordSection1 {size:612.0pt 792.0pt; margin:72.0pt 90.0pt 72.0pt 90.0pt;} div.WordSection1 {page:WordSection1;} --></style><!--[if gte mso 9]><xml> <o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" /> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext=3D"edit"> <o:idmap v:ext=3D"edit" data=3D"1" /> </o:shapelayout></xml><![endif]--> <div class=3D"WordSection1"> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Cal= ibri",sa