Trophic Status Evaluation for 154 Lakes in Quebec, Canada: Monitoring and Recommendations

Abstract

Based on chlorophyll a, total phosphorus, transparency (Secchi disk), and total nitrogen, 154 lakes located in southern regions of the Quebec province were classified according to their trophic status. Various classification methods were presented and discussed. The evaluation of existing relationships among quality parameters were established, and suggestions for priority actions and restoration initiatives were given. The ‘Reseau de surveillance de lacs’ of the Ministère de développement durable, environnement et parcs is considered as a very successful program that should be increasingly supported by the government. The program meets sustainable development principles in watershed management. The results showed that although the majority of lakes surveyed were within optimal conditions (oligotrophic status), 22 lakes required closer surveillance and more effective nutrient control measures.

Method for screening water physicochemical parameters to calculate water quality index based on these parameters’ correlation with water microbiota

“…Transparency and chlorophyll a concentration are two important water parameters that are closely related to river and lake primary productivity [ [33] , [34] , [35] , [36] ], and are used to assess the degree of eutrophication of rivers and lakes [ [37] , [38] , [39] , [40] ]. However, they are usually excluded when calculating WQI [ 14 , 32 , 40 ].…”

Trophic Status of Shanti Sagara Reservoir: Implications on Nutrient Management in Reservoir Catchment

“…Shanti Sagara reservoir also known as Sulekere locally, which is inlet of the River Tungabhadra. The reservoir is constructed in the (11 th and 12 th century). Shanti Sagara is second largest freshwater reservoir in Asia and is located in Channagiri Taluk, Davanagere District, Karnataka (Fig.…”

“…In summer, sudden rainstorm disturbance could cause overlaying water to move vertically, and the vigorous agitation of water lead to toxic substance in sediment contaminant diffusing into water, which poses a direct threat to water safety and even results in incidents of dead fish. Water temperature changes with season and reservoirs would turn water over at the seasonal transition period, which accelerate the transformation of sediment contaminants in reservoirs and bring contaminants to surface [11,12]. Researches show that the released nutrients by turning over could promote the reproduce of algae in spring.…”

Peer Review #1 of "Trophic degradation predispositions and intensity in a high-flow, silted reservoir (v0.1)"

“…Concentrations of the substrates nitrogen and phosphorus in reservoir water were relatively high, amounting to 1.46 and 0.171 mg•dm -3 respectively, on average. Mean values for the N:P mass ratio below 10:1 indicate that nitrogen is usually present at concentrations limiting the reservoir's internal production of OM (Galvez-Cloutier & Sanchez, 2007;Hou et al, 2013). A reduction of the ratio of nitrogen to phosphorus (N:P) in water, and therefore stimulation of cyanobacterial bloom, can occur due to the release of phosphates accumulated in sediments (Orihel et al, 2015).…”