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Index of Subjects This was actually suggested when yellow floating heart was found in Little Abro but the correlation between human disturbance and exotic plants is very strong. Although there is a minority of species that may invade undisturbed natural systems, in NS it is really only the glossy buckthorn and maybe rugosa rose that invade undisturbed systems. The observation (John and Nhung) that purple loosestrife, branded as purple killer 20years ago, has not made inroads into native habitat in NS is a case in point. We have some what might be thought of as, highly vulnerable, high diversity coastal plain lakeshores in SW NS. The lakeshores are naturally scoured every year from ice and water level fluctuations and yet, the only time we have seen any exotic plants on these wet meadow fringes of the lakes, is after lakes have been dammed or, as in the Carleton system that has been artificially fertilized by mink farm wastes, enriched. We can manage wild systems as if they were agricultural and spray to make sure we have all natives but we would end up disturbing more the balance of these systems making them more invadable. An example of this was when Kings county stopped spraying roadsides to control ragweed and how this resulted in a dramatic, widespread reduction in roadside ragweed. Given that there is HRM water quality evidence that Frog Pond suffered some water quality disruption, it would be more prudent to monitor this population of Cabomba. If monitoring shows it is still spreading, one can then harvest it and this would help water quality by removing the nutrients the plant had scrubbed in times when excess nutrients were available. Nick On Mon, Dec 29, 2014 at 3:43 PM, Fred Schueler <bckcdb@istar.ca> wrote: > Quoting Dusan Soudek <soudekd@ns.sympatico.ca>: > >> 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.... > > > * the definition of an "invasive" as opposed to a "naturalized" species is > that they'll move into more or less "undisturbed" habitats. It's likely no > fault of the Frog Pond that the Caboma got dumped there, and I suggest the > immediate organization of whatever control actions are appropriate to > suppress this colonization. Invasive species groups and agencies whoop > "rapid detection/rapid response" as their goal - but this rarely happens > except in the case of pests of agriculture or forest trees. > > fred. > ------------------------------------------------------------ > Frederick W. Schueler & Aleta Karstad > Mudpuppy Night - http://pinicola.ca/mudpup1.htm > Vulnerable Watersheds - http://vulnerablewaters.blogspot.ca/ > study our books - http://pinicola.ca/books/index.htm > RR#2 Bishops Mills, Ontario, Canada K0G 1T0 > on the Smiths Falls Limestone Plain 44* 52'N 75* 42'W > (613)258-3107 <bckcdb at istar.ca> http://pinicola.ca/ > "[The] two fundamental steps of scientific thought - the conjecture and > refutation of Popper - have little place in the usual conception of > intelligence. If something is to be dismissed as inadequate, it is surely > not Darwin [, whose] works manifest the activity of a mind seeking for > wisdom, a value which conventional philosophy has largely abandoned." > Ghiselen, 1969. Triumph of the Darwinian Method, p 237. > ------------------------------------------------------------ > >
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