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First Lake, Lower Sackville

Soil & Water Conservation Society of Metro Halifax (SWCSMH)

Updated: August 08, 2015   Shubenacadie River headwaters

Caution: Since First is a shallow lake, the standard limnetic (i.e., open-water) trophic parameters may not represent the true trophic status of the lake

The Shubenacadie song (i.e., the Stonemason's song), and the history of the Stonemason's song; and, Lifelike murals at the heavily travelled MicMac Parclo in Dartmouth, Nova Scotia, Canada

Acknowledgements


Contents:



Water Quality

Chemical vs Biological monitoring


Select scientific modelling and chemical/biological limnology are part of our miscellaneous archives


The bathymetric map; the morphological data; the location map; the Shubencadie River headwaters flow chart;
peruse our predictive modelling, and view a relevant model; the paleolimnology of lakes in the HRM

  • Deep station total phosphorus (TP)- comparison with our hindcast models; October 18, 2013
  • Phosphorus:- Details on LCC (Lake Carrying Capacity)/Threshold values of lakes, and comparison with artificially high values chosen by the HRM; March 14, 2014


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    Overview of our concerns

    Our primary concerns re this lake have been w.r.t the various symptoms associated with cultural eutrophication inclusive of severe dissolved oxygen depletion in the hypolimnium during the critical periods of summer months. As the year-2004 CCME Policy on Phosphorus (TP) clearly narrates that not adhering to the reference/background (i.e., the natural pre-development value) + 50% maximum increase concept, even if they fall within the reference/background trigger ranges, could result in significant changes to the `COMMUNITY STRUCTURE' (cf. eutro1, and eutro2)!

    Our secondary concern has been with sporadic high fecal counts in parts of the lake and no single location has been indicative of the overall fecal pollution from multiple sources.

    There has been no scientific evidence of any reduction and/or return to its natural background values based on our predictive TP modelling.

    Even of more importance as a comparison are the trophic guidelines of the CCME and the indicator thresholds for anthropogenic stressors of freshwater lakes in Nova Scotia!

    This is one of the lakes in HRM which has been studied extensively by various researchers inclusive of us limnologists as well as by paid consultants. The vast majority of the scientific and other general consultant studies are easily available to the public through a combination of the Dalhousie University library system, the HRM, and other sources.

    While our latest scientific biostats are not yet available in the public domain, nevertheless, the vast majority of our scientific investigations inclusive of our phycology are indeed available through the local university libraries.

    We herewith take liberty in pointing out that the approximate one hundred and twenty thousand dollar ($120,000) Federal-Provincial SEDA demonstration project at First Lake did not document any appreciable reduction in phosphorus export. This project headed by the Municipality of the County of Halifax was inadequate since it did not include the entire subwatershed of First lake; it was only a demonstration project which incorporated experimental stewardship practices of around 1-ha with another similar site as a control. This project was the successor to another approx. $45,000 project for an initial assessment carried out for the County.



    Hypolimnetic lake aeration prescribed

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    There have been several successful case histories of lake aeration worldwide as well as in Canada.



    Concerns of stakeholders and Government agencies



    Acknowledgements

    Google Earth for the maps

    The jpeg scan of the fish was extracted by biologist, Peter Shacklock, from the Tv show we had produced featuring underwater video of the fish species of the Shubenacadie Lake system during year-1994.



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