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Hi Again,
My question was not about composition of guano but whether or not=20
it kills woody perennials (especially trees) in areas where hardening=20
off to avoid cold induced winter kill (largely dessication I think) is=20
not a consideration; tropical to warm temperate. In extreme cases where=20
the deposit rate is high and soil becomes buried I expect all plant life=20
is killed.
I visited a "Crane colony" in NS many years ago and there were no=20
live and lots of dead hardwood trees but I don't recall any noticeable=20
accumulation of bird droppings on the litter.
Yt, DW, Kentville
------ Original Message ------
From: "Laviolette, Lance" <lance.laviolette@lmco.com>
To: "naturens@chebucto.ns.ca" <naturens@chebucto.ns.ca>
Sent: 3/29/2018 4:00:57 PM
Subject: Re[2]: [NatureNS] Cormorants and Great Blues
>Hi David,
>
>
>
>You are far more qualified than I am to understand the soil chemistry=20
>involved. Guano is uric acid so I=E2=80=99ll hypothesis that the acidic=20
>component damages the trees directly.
>
>
>
>Nick Hill might also be able to comment on the effect that gulls have=20
>had on plant community succession on Brier Island. I=E2=80=99d be interest=
ed to=20
>know if it is the soil chemistry of former colony locations suppresses=20
>shrub and tree growth or if there is active destruction of young growth=20
>by gulls.
>
>
>
>Cheers,
>
>
>
>Lance
>
>
>
>From:naturens-owner@chebucto.ns.ca=20
>[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
>
>
>
>Hi Lance & All,
>
> I am guessing that tree death is due to winter kill of growth=20
>which, due to excess N, failed to harden off. But, does guano also kill=20
>woody perennials where winter kill is not possible (too warm) ?
>
>Yt, DW, Kentville
>
>
>
>------ 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
>
>
>
>>Hi Everyone,
>>
>>
>>
>>That=E2=80=99s the usual cycle of Great Blue Heron and Double-creasted=20
>>Cormorant nesting on Nova Scotia Islands.
>>
>>
>>
>>Grass > Brambles> Shrubs > Trees > double-crested cormorants/great=20
>>blue herons > Trees > Shrubs/brambles > Grass
>>
>>
>>
>>Guano is a great fertilizer, rich in nitrogen, phosphate and=20
>>potassium, but like any fertilizer, too much is not a good thing and=20
>>as everyone who has visited a cormorant or great blue heron colony=20
>>knows, they produce a lot of guano.
>>
>>
>>
>>The Great Blue Herons move to start the process on another treed=20
>>island once the trees are all killed and can no longer support a nest=20
>>structure (although I did come across Great Blue Herons nesting on an=20
>>island in a lake in Yarmouth County once).
>>
>>
>>
>>The Grass stage is prolonged as long as gulls and/or the cormorants=20
>>start nesting on the ground. Common Eiders can be in the mix at=20
>>several stages.
>>
>>
>>
>>The Grass stage ends and plant succession begins when these ground=20
>>nesting species are forced to move off the island and erosion hasn=E2=80=
=99t=20
>>reduced the island to mostly bare rock.
>>
>>
>>
>>Cheers,
>>
>>
>>
>>Lance
>>
>>
>>
>>Lance Laviolette
>>
>>Glen Robertson, Ontario
>>
>>
>>
>>
>>
>>
>>
>>From:naturens-owner@chebucto.ns.ca=20
>>[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=E2=80=99s s story from before your time, John K.!
>>
>>
>>
>>Years ago, the island in mid-Yarmouth Harbour was well-treed. Mighta=20
>>been back in the =E2=80=9970=E2=80=99s that cormorants started to get mor=
e abundant=20
>>and really liked that island. Lotsa bushes on the island now; all the=20
>>spruce trees died out.
>>
>>
>>
>>From:naturens-owner@chebucto.ns.ca=20
>>[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
>>
>>
>>
>>John, are double-crested cormorants becoming a disturbance and habitat=20
>>enrichment problem here in NS..similar in a way to herring gulls?
>>
>>Nick
>>
>>
>>
>>On Thu, Mar 29, 2018 at 10:02 AM, John Kearney=20
>><john.kearney@ns.sympatico.ca> wrote:
>>
>>Hi All,
>>Two Double-crested Cormorants and six Great Blue Herons arrived at the=20
>>Johns Island nesting colony in Yarmouth Harbour this morning. There=20
>>seemed to be more cormorants crouching in grass, perhaps recovering=20
>>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
>>
>>
>>
>>
>>
>>
>>--
>>
>>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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