[NatureNS] Frog Pond (Halifax) - Non-native Aquatic - Fanwort (Cabomba sp.)

From: "Dusan Soudek" <soudekd@ns.sympatico.ca>
To: <naturens@chebucto.ns.ca>
References: <CAD2SNSBbqbVp0rJr1u-jGx7ZnKJo15H=4Uk22QEx+B9v8D6irQ@mail.gmail.com> <CAOK1_Gaka7D1mEmgAVYw1um5qhU0tUC-yJ680UXrf_gd4LkL1w@mail.gmail.com> <CAD2SNSCVZLv=fje3th7eEYcNwVFvu7fyWVe-Ef=Eb=nrFxriVg@mail.gmail.com>
Date: Sun, 28 Dec 2014 16:20:35 -0400
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This afternoon I had a chance to visit Frog Pond. The amount of floating 
Fanwort (Cabomba caroliniana ??) biomass there is quite impressive, 
particularly along the smallish coves of the northern basin. In places the 
Fanwort zone is several metres wide. Of course,  there is no quick way of 
telling how much of the pond's bottom is covered with this plant.

The rhizomes were lush green, but I didn't observe any of the resident Black 
or Mallard ducks feeding on them. I briefly checked the nearby pond on the 
other (i.e., southern) side of Purcells Cove Road for Fanwort but didn't 
find any. It may be worthwhile to keep checking other nearby freshwater 
bodies (Whimsical Lake, Cunard Pond, Williams Lake) for spread of this 
invasive plant.

Dusan Soudek

-----Original Message----- 
From: Burkhard Plache
Sent: Friday, December 26, 2014 6:35 PM
To: naturens@chebucto.ns.ca
Subject: Re: [NatureNS] Frog Pond (Halifax) - Non-native Aquatic

Here is a link to a few photos of the specimens floating in clear water:

On Fri, Dec 26, 2014 at 11:04 AM, Nicholas Hill <fernhillns@gmail.com> 
> Can you send an image of your aquatic?
> No reports of Cabomba here that I can see. Have you considered the
> bladderworts (e.g, purple bladderwort)?
> Nick
> On Thu, Dec 25, 2014 at 1:27 PM, Burkhard Plache
> <burkhardplache@gmail.com> wrote:
>> For a number of weeks now, I had noticed a heavy accumulation
>> of an aquatic herb at the shoreline of Frog Pond.
>> Initially I assumed it might be Ceratophyllum (hornwort) or
>> Myriophyllum (water milfoil), both reported from Nova Scotia.
>> However, the plant has opposite leaves, which are fan-like,
>> finely divided. I am now certain it is a species of Cabomba,
>> most likely Cabomba caroliniana.
>> The species is not native to NS, but used in aquariums.
>> Maybe this introduction was the result of an aquarium dump.
>> (Could have happened a few years back when a Gold Fish
>> or a Koi was seen in the pond.)
>> In other regions of the world Cabomba is a problematic
>> invasive. Is it problematic here as well?
>> Have people seen this in other parts of Nova Scotia?
>> Wikipedia links to the species mentioned above:
>> https://en.wikipedia.org/wiki/Ceratophyllum
>> https://en.wikipedia.org/wiki/Myriophyllum
>> https://en.wikipedia.org/wiki/Cabomba_caroliniana 

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