next message in archive
no next message in thread
previous message in archive
previous message in thread
Index of Subjects
Index of Subjects Two obvious sources are defecating dogs on Frog Pond Trail and the unnaturally high numbers of water fowl that some visitors insist on feeding. I don't remember ever seeing an algal bloom in the summer on Frog Pond. Dusan Soudek -----Original Message----- From: Nicholas Hill Sent: Monday, December 29, 2014 3:51 PM To: naturens@chebucto.ns.ca Subject: Re: [NatureNS] Frog Pond (Halifax) - Non-native Aquatic - Fanwort (Cabomba sp.) Yes, and we used to drink it in winter playing hockey. Where would the high levels of coliform come from? On Mon, Dec 29, 2014 at 3:18 PM, Dusan Soudek <soudekd@ns.sympatico.ca> wrote: > Interestingly, the Frog Pond watershed is still largely forested, as > much > of it is located within the Sir Sanford Fleming Park. And the entire > shoreline of the pond, with the exception of where it touches Purcells > Cove > Road and a few lookoffs off the Frog Pond Trail, remains undeveloped. This > is quite unusual for HRM's urban and suburban water bodies, most of which > have experienced some degree of eutrophication.... > Dusan Soudek > > > -----Original Message----- From: Nicholas Hill > Sent: Monday, December 29, 2014 12:04 PM > To: naturens@chebucto.ns.ca > Subject: Re: [NatureNS] Frog Pond (Halifax) - Non-native Aquatic - Fanwort > (Cabomba sp.) > > > Something must be out of kilter in the Frog Pond; Invasive plants for > the most part, are indicators of a disrupted nutrient or disturbance > regime. The aquatic exotics do us a favour by pointing out lakes with > ecological health problems. The apparent outbreak of Cabomba > caroliniana at Frog Pond may be linked to a decline in that lake's > water quality. Coliform warning was given in 2008 (HRM data) for > coliforms around 800 MPN/100mL ...in summer 2009 no exact figures were > available..in summer 2010, levels spiked to 3500 MPN/100mL (the > highest in HRM?) and in 2011, levels were down to 600MPN range. > > It should be reason for concern and an opportunity to track imbalances > in the signs of health in lakes and this plant should reasonably, also > be in Whimsical Lake if that lake has gone through the same water > quality disruptions. The plant is the warning of imbalance. Instead of > a purple bladderwort growth or the native floating heart, we get > Cabomba, doing the same as these other plants but doing it more > effectively when there is more nutrient in the water or at lower > oxygen levels in more stress. Recall the outbreak of the "invasive" > yellow floating heart. THis was not a biodiversity crisis but rather a > sign that something was out of kilter. > > Nick > > below attached from HRM 2008 > > > > > > Public Service Announcement > > Frog Pond and Whimsical Lake Water Quality Advisory > > Friday, September 5, 2008 - The public is advised that ecological > water quality samples taken August 25th at Whimsical Lake and the Frog > Pond has detected faecal coliform bacteria levels exceeding provincial > and federal recreational/swimming guidelines. > > Whimsical Lake and the Frog Pond are not HRM supervised beaches. > > These water test samples are taken as part of HRM's on-going > ecological water sampling program to help give long term data as to > the health of 62 sampled lakes and are not part of the weekly sampling > program undertaken at HRM's supervised beaches. > > On Sun, Dec 28, 2014 at 4:20 PM, Dusan Soudek <soudekd@ns.sympatico.ca> > wrote: >> >> 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: >> https://www.dropbox.com/sh/5cqlzcbn93wayoh/AABLTH0_OET6amgcDO0bcvR8a?dl=0 >> >> On Fri, Dec 26, 2014 at 11:04 AM, Nicholas Hill <fernhillns@gmail.com> >> wrote: >>> >>> >>> 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 >> >> >> >> > >
next message in archive
no next message in thread
previous message in archive
previous message in thread
Index of Subjects