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morants and Great Blues<u></u><u></u></span></p><p class=3D"M
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I am just re-reading some of the Nature NS exchanges. The ecological
succession of coastal island forests described by Lance is fascinating.
I am reminded of a recent discussion with Dr Malcolm Hunter. He asked
about our eagle populations. It seems that they are growing all over
the eastern seaboard and this has lead to the disappearance of entire
heron colonies in the US. I understand this is occurring here also to
some extent. I shared with him the impacts the eagle populations seem
to be having on loon chicks recently.
It's all about _balance_. Industrial farming and other human-caused
stressors, knock ecosystem components out of kilter, but there are some
ways to minimize our impacts if we want to address the issues.
Rendering plants for poultry carcasses is one easy fix. Are the
cormorants partly filling a niche that is being vacated by declining
heron populations? (I'm a 'forest dweller', so I am less familiar with
our coastal dynamics.)
Donna Crossland
On 2018-03-29 12:26 PM, Laviolette, Lance wrote:
>
> Hi Everyone,
>
> That’s the usual cycle of Great Blue Heron and Double-creasted
> Cormorant nesting on Nova Scotia Islands.
>
> Grass > Brambles> Shrubs > Trees > double-crested cormorants/great
> blue herons > Trees > Shrubs/brambles > Grass
>
> Guano is a great fertilizer, rich in nitrogen, phosphate and
> potassium, but like any fertilizer, too much is not a good thing and
> as everyone who has visited a cormorant or great blue heron colony
> knows, they produce a lot of guano.
>
> The Great Blue Herons move to start the process on another treed
> island once the trees are all killed and can no longer support a nest
> structure (although I did come across Great Blue Herons nesting on an
> island in a lake in Yarmouth County once).
>
> The Grass stage is prolonged as long as gulls and/or the cormorants
> start nesting on the ground. Common Eiders can be in the mix at
> several stages.
>
> The Grass stage ends and plant succession begins when these ground
> nesting species are forced to move off the island and erosion hasn’t
> reduced the island to mostly bare rock.
>
> Cheers,
>
> Lance
>
> Lance Laviolette
>
> Glen Robertson, Ontario
>
> *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
>
> Here’s s story from before your time, John K.!
>
> Years ago, the island in mid-Yarmouth Harbour was well-treed. Mighta
> been back in the ’70’s that cormorants started to get more abundant
> and really liked that island. Lotsa bushes on the island now; all the
> spruce trees died out.
>
> *From:*naturens-owner@chebucto.ns.ca
> <mailto: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 <mailto:naturens@chebucto.ns.ca>
> *Subject:* Re: [NatureNS] Cormorants and Great Blues
>
> John, are double-crested cormorants becoming a disturbance and habitat
> enrichment problem here in NS..similar in a way to herring gulls?
>
> Nick
>
> On Thu, Mar 29, 2018 at 10:02 AM, John Kearney
> <john.kearney@ns.sympatico.ca <mailto:john.kearney@ns.sympatico.ca>>
> wrote:
>
> Hi All,
> Two Double-crested Cormorants and six Great Blue Herons arrived at the
> Johns Island nesting colony in Yarmouth Harbour this morning. There
> seemed to be more cormorants crouching in grass, perhaps recovering
> from their journey. I couldn’t tell for sure.
> None of these were there yesterday when I checked.
> John
>
> Sent from my iPhone
>
>
>
> --
>
> Dr. N.M.Hill
> Fern Hill Institute of Plant Conservation
> 424 Bentley Road, Berwick, NS, B0P 1E0
>
> phone 902-698-0416
>
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<p>I am just re-reading some of the Nature NS exchanges. The
ecological succession of coastal island forests described by Lance
is fascinating. I am reminded of a recent discussion with Dr
Malcolm Hunter. He asked about our eagle populations. It seems
that they are growing all over the eastern seaboard and this has
lead to the disappearance of entire heron colonies in the US. I
understand this is occurring here also to some extent. I shared
with him the impacts the eagle populations seem to be having on
loon chicks recently.</p>
<p>It's all about <u>balance</u>. Industrial farming and other
human-caused stressors, knock ecosystem components out of kilter,
but there are some ways to minimize our impacts if we want to
address the issues. Rendering plants for poultry carcasses is one
easy fix. Are the cormorants partly filling a niche that is being
vacated by declining heron populations? (I'm a 'forest dweller',
so I am less familiar with our coastal dynamics.)<br>
</p>
<p>Donna Crossland<br>
</p>
<br>
<div class="moz-cite-prefix">On 2018-03-29 12:26 PM, Laviolette,
Lance wrote:<br>
</div>
<blockquote type="cite"
cite="mid:990B3EE94E8A61448C998FEBAEAFC024232CEFAF@HCXDSPM2.ca.lmco.com">
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi
Everyone,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">That’s
the usual cycle of Great Blue Heron and Double-creasted
Cormorant nesting on Nova Scotia Islands.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Grass
> Brambles> Shrubs > Trees > double-crested
cormorants/great blue herons > Trees > Shrubs/brambles
> Grass<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Guano
is a great fertilizer, rich in nitrogen, phosphate and
potassium, but like any fertilizer, too much is not a good
thing and as everyone who has visited a cormorant or great
blue heron colony knows, they produce a lot of guano.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">The
Great Blue Herons move to start the process on another treed
island once the trees are all killed and can no longer
support a nest structure (although I did come across Great
Blue Herons nesting on an island in a lake in Yarmouth
County once).
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">The
Grass stage is prolonged as long as gulls and/or the
cormorants start nesting on the ground. Common Eiders can be
in the mix at several stages. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">The
Grass stage ends and plant succession begins when these
ground nesting species are forced to move off the island and
erosion hasn’t reduced the island to mostly bare rock.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Lance<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Baskerville Old
Face",serif;color:#1F497D">Lance Laviolette<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Baskerville Old
Face",serif;color:#1F497D">Glen Robertson, Ontario<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"
lang="EN-US">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"
lang="EN-US"> naturens-owner@chebucto.ns.ca
[mailto:naturens-owner@chebucto.ns.ca]
<b>On Behalf Of </b>John and Nhung<br>
<b>Sent:</b> March 29, 2018 10:36 AM<br>
<b>To:</b> naturens@chebucto.ns.ca<br>
<b>Subject:</b> EXTERNAL: RE: [NatureNS] Cormorants and
Great Blues<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Here’s
s story from before your time, John K.!
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Years
ago, the island in mid-Yarmouth Harbour was well-treed.
Mighta been back in the ’70’s that cormorants started to get
more abundant and really liked that island. Lotsa bushes on
the island now; all the spruce trees died out.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif"
lang="EN-US">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif"
lang="EN-US">
<a href="mailto:naturens-owner@chebucto.ns.ca"
moz-do-not-send="true">naturens-owner@chebucto.ns.ca</a> [<a
href="mailto:naturens-owner@chebucto.ns.ca"
moz-do-not-send="true">mailto:naturens-owner@chebucto.ns.ca</a>]
<b>On Behalf Of </b>Nick Hill<br>
<b>Sent:</b> March 29, 2018 10:21 AM<br>
<b>To:</b> <a href="mailto:naturens@chebucto.ns.ca"
moz-do-not-send="true">naturens@chebucto.ns.ca</a><br>
<b>Subject:</b> Re: [NatureNS] Cormorants and Great Blues<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">John, are double-crested cormorants
becoming a disturbance and habitat enrichment problem here
in NS..similar in a way to herring gulls?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Nick<o:p></o:p></p>
</div>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On Thu, Mar 29, 2018 at 10:02 AM, John
Kearney <<a href="mailto:john.kearney@ns.sympatico.ca"
target="_blank" moz-do-not-send="true">john.kearney@ns.sympatico.ca</a>>
wrote:<o:p></o:p></p>
<p class="MsoNormal">Hi All,<br>
Two Double-crested Cormorants and six Great Blue Herons
arrived at the Johns Island nesting colony in Yarmouth
Harbour this morning. There seemed to be more cormorants
crouching in grass, perhaps recovering from their journey.
I couldn’t tell for sure.<br>
None of these were there yesterday when I checked.<br>
John<br>
<br>
Sent from my iPhone<o:p></o:p></p>
</div>
<p class="MsoNormal"><br>
<br clear="all">
<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal">-- <o:p></o:p></p>
<div>
<p class="MsoNormal">Dr. N.M.Hill<br>
Fern Hill Institute of Plant Conservation<br>
424 Bentley Road, Berwick, NS, B0P 1E0<br>
<br>
phone 902-698-0416<o:p></o:p></p>
</div>
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