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Hi Nick, John, and all,
In his 1930 monograph on the Double-crested Cormorant, Harrison Lewis, a =
contemporary of Robie Tufts, wrote =E2=80=9CFor one reason or another or =
for no reason at all, Double-crested Cormorants have been continually =
and consistently persecuted.=E2=80=9D Archaeological research indicates =
that they were more abundant prior to European settlement and declined =
greatly due to hunting, and the destruction of their eggs and young. =
Even after receiving some legal protection, they underwent further =
decline, along with Ospreys, and eagles, from pesticides in the fish =
food chain. Any indications now that they are increasing are likely a =
recovery to more historic levels. Thus whatever nutrient enrichment they =
may be responsible for would be similar to a prior ecological cycle. The =
enrichment problem caused by gulls, on the other hand, is the result of =
the lack of or insufficient treatment of human waste products.
I=E2=80=99ve seen many instances where heron and cormorant colonies have =
killed all the trees. These localities would be very rich in nutrients. =
At one time, our neighbour to the south would annex any unclaimed island =
that had a cormorant colony on it in order to mine the guano.
John
=20
=20
From: naturens-owner@chebucto.ns.ca <naturens-owner@chebucto.ns.ca> On =
Behalf Of Nick Hill
Sent: Thursday, March 29, 2018 10:21
To: naturens@chebucto.ns.ca
Subject: Re: [NatureNS] Cormorants and Great Blues
=20
John, are double-crested cormorants becoming a disturbance and habitat =
enrichment 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 <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=E2=80=99t tell for sure.
None of these were there yesterday when I checked.
John
Sent from my iPhone
=20
--=20
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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class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>Hi Nick, John, and =
all,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>In his 1930 monograph on the =
Double-crested Cormorant, Harrison Lewis, a contemporary of Robie Tufts, =
wrote =E2=80=9CFor one reason or another or for no reason at all, =
Double-crested Cormorants have been continually and consistently =
persecuted.=E2=80=9D Archaeological research indicates that they were =
more abundant prior to European settlement and declined greatly due to =
hunting, and the destruction of their eggs and young. Even after =
receiving some legal protection, they underwent further decline, along =
with Ospreys, and eagles, from pesticides in the fish food chain. Any =
indications now that they are increasing are likely a recovery to more =
historic levels. Thus whatever nutrient enrichment they may be =
responsible for would be similar to a prior ecological cycle. The =
enrichment problem caused by gulls, on the other hand, is the result of =
the lack of or insufficient treatment of human waste =
products.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>I=E2=80=99ve seen many instances =
where heron and cormorant colonies have killed all the trees. These =
localities would be very rich in nutrients. At one time, our neighbour =
to the south would annex any unclaimed island that had a cormorant =
colony on it in order to mine the guano.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>John<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><p =
class=3DMsoNormal><b><span lang=3DEN-US>From:</span></b><span =
lang=3DEN-US> naturens-owner@chebucto.ns.ca =
<naturens-owner@chebucto.ns.ca> <b>On Behalf Of </b>Nick =
Hill<br><b>Sent:</b> Thursday, March 29, 2018 10:21<br><b>To:</b> =
naturens@chebucto.ns.ca<br><b>Subject:</b> Re: [NatureNS] Cormorants and =
Great Blues<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><