Lake Trophic State<\/strong><\/h3>\n Oligotrophic Lakes<\/strong> are the least productive. They characteristically have clear water, with high water column transparency The water column will also be well oxygenated, which, depending on temperature, may allow the lake to support cold-water fish like trout and salmon. These lakes are also often preferred for recreational activities such as swimming, paddling, water skiing, diving, and boating.<\/p>\nMesotrophic lake<\/strong>s are moderately productive, and their water clarity is lower than oligotrophic lakes. The higher primary production results in more algae, which decreases transparency. In addition, higher primary production results in increased bacterial decomposition of organic matter. Bacteria consume oxygen during decomposition, which results in decreased oxygen concentrations in the deeper waters of mesotrophic lakes. Lower oxygen concentrations in the deeper waters make it less likely that these lakes will support cold-water fish. Mesotrophic lakes are often good for fishing for warm-water species such as yellow perch, bass, and northern pike.<\/p>\nEutrophic lakes<\/strong> are highly productive. The water clarity of eutrophic lakes tends to be very low. Eutrophic lakes may have algal blooms problems and taste and odor issues. The high levels of primary production and decomposition will result in low levels of dissolved oxygen, affecting fish and other aquatic organisms. These lakes will have only warm-water fishes, predominately bass.<\/p>\nHypereutrophic lakes<\/strong> are incredibly productive, they are typically dominated by algae scums at the surface, and their transparency is less than 1.5 feet (0.5 meters). These lakes are so productive that they may experience extremely low dissolved oxygen due to decomposition, even in the surface waters, resulting in summer fish kills.<\/p>\nThe description continues with comments on Factors That Influence Trophic State (Nutrient Supply, Lake & Watershed Shape, Lake Aging, Cultural Eutrophication – see allaboutlakes.org<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nTotal Phosphorous Level as\u00a0Predictor of Trophic State<\/strong><\/p>\n![\"\"](\"http:\/\/versicolor.ca\/sandylakebedford\/wp-content\/uploads\/2024\/09\/Screen-Shot-2024-09-25-at-3.34.43-PM-300x200.png\")
<\/a>Total Phosphorous Trigger Ranges for Canadian Lakes and Rivers*<\/strong> <\/a><\/p><\/div>\nFor many lakes and most lakes in NS,\u00a0 it has been shown that the Total Phosphorous level in samples of surface water collected in the spring is\u00a0 a good predictor of the lake productivity, and hence of its trophic state. The table at right shows the generally applied “Trigger Ranges”for Total P in Canada.\u00a0\u00a0 Source: Canadian Council of Ministers of the Environment. 2004. Canadian water quality guidelines for the protection of aquatic life:Phosphorus: Canadian Guidance Framework for the Management of Freshwater Systems. In: Canadian environmental quality guidelines, 2004, Canadian Council of Ministers of the Environment, Winnipeg Available at <\/small>https:\/\/ccme.ca\/en\/res\/phosphorus-en-canadian-water-quality-guidelines-for-the-protection-of-aquatic-life.pdf<\/a><\/small>
\nNote that six Trophic states are distinguished, 3 of them variants of the\u00a0 Ologotrophic, Mesotrophic and Eutrophic States. Often agencies making use of this classification\u00a0 cite only the 3 major states,\u00a0 combining them with some of the variants,\u00a0 e.g AECOM 2014 distinguishes between Oligotrophic (0-10 ug\/L Total P), Mesotrophic (>10.o to 20 ug\/L Total P) and Eutrophic (>20.o ug\/L Total P)<\/p>\nMore Useful Links<\/strong><\/p>\n– Water indicators \u2013 Lake trophic status<\/strong><\/a>
\nAlberta Gov. “Water monitoring results for chlorophyll-a and total phosphorus concentrations and Secchi depth.”<\/p>\n–Pages from Urban Lake Management<\/a>,<\/strong> “A Periodic Bulletin on Urban Watershed Restoration and Protection Tools”, Vol. 3, No. 4 \u2014 December 2001 By Center for Watershed Protection:<\/p>\n– Managing Phosphorus Inputs Into Lakes Introduction<\/strong><\/a><\/em>
\n– I. Determining the Trophic State of Your Lake<\/a><\/strong> by Ted Brown and Jon Simpson<\/em>
\n– II. Crafting an Accurate Phosphorus Budget for Your Lake<\/strong><\/a> by Deb Caraco and Ted Brown
\n– III. Evaluating the Impact of Watershed Treatment<\/strong><\/a> by Deb Caraco<\/em>
\n– The Influence of Septic Systems at the Watershed Level<\/a><\/strong> by Chris Swann<\/em><\/p><\/blockquote>\nAlso view the subpage to this page, Extracts… (About P)<\/strong><\/a>; and lit. relating to Phosphorous on the top level page (Lit and Links<\/a>)<\/p>\n","protected":false},"excerpt":{"rendered":"While for many types of plant and animal communities, higher productivity is associated with desirable features, such as more species and larger wildlife populations, more carbon capture,\u00a0 more food to\u00a0 harvested etc,\u00a0 for many types of lakes including most lakes … Continue reading
Mesotrophic lake<\/strong>s are moderately productive, and their water clarity is lower than oligotrophic lakes. The higher primary production results in more algae, which decreases transparency. In addition, higher primary production results in increased bacterial decomposition of organic matter. Bacteria consume oxygen during decomposition, which results in decreased oxygen concentrations in the deeper waters of mesotrophic lakes. Lower oxygen concentrations in the deeper waters make it less likely that these lakes will support cold-water fish. Mesotrophic lakes are often good for fishing for warm-water species such as yellow perch, bass, and northern pike.<\/p>\n Eutrophic lakes<\/strong> are highly productive. The water clarity of eutrophic lakes tends to be very low. Eutrophic lakes may have algal blooms problems and taste and odor issues. The high levels of primary production and decomposition will result in low levels of dissolved oxygen, affecting fish and other aquatic organisms. These lakes will have only warm-water fishes, predominately bass.<\/p>\n Hypereutrophic lakes<\/strong> are incredibly productive, they are typically dominated by algae scums at the surface, and their transparency is less than 1.5 feet (0.5 meters). These lakes are so productive that they may experience extremely low dissolved oxygen due to decomposition, even in the surface waters, resulting in summer fish kills.<\/p>\n The description continues with comments on Factors That Influence Trophic State (Nutrient Supply, Lake & Watershed Shape, Lake Aging, Cultural Eutrophication – see allaboutlakes.org<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Total Phosphorous Level as\u00a0Predictor of Trophic State<\/strong><\/p>\n Total Phosphorous Trigger Ranges for Canadian Lakes and Rivers*<\/strong> <\/a><\/p><\/div>\n For many lakes and most lakes in NS,\u00a0 it has been shown that the Total Phosphorous level in samples of surface water collected in the spring is\u00a0 a good predictor of the lake productivity, and hence of its trophic state. The table at right shows the generally applied “Trigger Ranges”for Total P in Canada.\u00a0\u00a0 Source: Canadian Council of Ministers of the Environment. 2004. Canadian water quality guidelines for the protection of aquatic life:Phosphorus: Canadian Guidance Framework for the Management of Freshwater Systems. In: Canadian environmental quality guidelines, 2004, Canadian Council of Ministers of the Environment, Winnipeg Available at <\/small>https:\/\/ccme.ca\/en\/res\/phosphorus-en-canadian-water-quality-guidelines-for-the-protection-of-aquatic-life.pdf<\/a><\/small> More Useful Links<\/strong><\/p>\n – Water indicators \u2013 Lake trophic status<\/strong><\/a> –Pages from Urban Lake Management<\/a>,<\/strong> “A Periodic Bulletin on Urban Watershed Restoration and Protection Tools”, Vol. 3, No. 4 \u2014 December 2001 By Center for Watershed Protection:<\/p>\n – Managing Phosphorus Inputs Into Lakes Introduction<\/strong><\/a><\/em> Also view the subpage to this page, Extracts… (About P)<\/strong><\/a>; and lit. relating to Phosphorous on the top level page (Lit and Links<\/a>)<\/p>\n","protected":false},"excerpt":{"rendered":" While for many types of plant and animal communities, higher productivity is associated with desirable features, such as more species and larger wildlife populations, more carbon capture,\u00a0 more food to\u00a0 harvested etc,\u00a0 for many types of lakes including most lakes … Continue reading <\/a>
\nNote that six Trophic states are distinguished, 3 of them variants of the\u00a0 Ologotrophic, Mesotrophic and Eutrophic States. Often agencies making use of this classification\u00a0 cite only the 3 major states,\u00a0 combining them with some of the variants,\u00a0 e.g AECOM 2014 distinguishes between Oligotrophic (0-10 ug\/L Total P), Mesotrophic (>10.o to 20 ug\/L Total P) and Eutrophic (>20.o ug\/L Total P)<\/p>\n
\nAlberta Gov. “Water monitoring results for chlorophyll-a and total phosphorus concentrations and Secchi depth.”<\/p>\n
\n– I. Determining the Trophic State of Your Lake<\/a><\/strong> by Ted Brown and Jon Simpson<\/em>
\n– II. Crafting an Accurate Phosphorus Budget for Your Lake<\/strong><\/a> by Deb Caraco and Ted Brown
\n– III. Evaluating the Impact of Watershed Treatment<\/strong><\/a> by Deb Caraco<\/em>
\n– The Influence of Septic Systems at the Watershed Level<\/a><\/strong> by Chris Swann<\/em><\/p><\/blockquote>\n