Journal ArticleDOI
A trophic state index for lakes1
TLDR
A numerical trophic state index for lakes has been developed that incorporates most lakes in a scale of 0 to 100, which represents a doubling in algal biomass as well as various measures of biomass or production.Abstract:
A numerical trophic state index for lakes has been developed that incorporates most lakes in a scale of 0 to 100. Each major division ( 10, 20, 30, etc. ) represents a doubling in algal biomass. The index number can bc calculated from any of several parameters, including Secchi disk transparency, chlorophyll, and total phosphorus. My purpose here is to present a new approach to the trophic classification of lakes. This new approach was developed because of frustration in communicating to the public both the current nature or status of lakes and their future condition after restoration when the traditional trophic classification system is used. The system presented hcrc, termed a trophic state index (TSI), involves new methods both of defining trophic status and of determining that status in lakes. All trophic classification is based on the division of the trophic continuum, howcvcr this is defined, into a series of classes termed trophic states. Traditional systems divide the continuum into three classes: oligotrophic, mesotrophic, and cutrophic. There is often no clear delineation of these divisions. Determinations of trophic state are made from examination of several diverse criteria, such as shape of the oxygen curve, species composition of the bottom fauna or of the phytoplankton, conccntrations of nutrients, and various measures of biomass or production. Although each changes from oligotrophy to eutrophy, the changes do not occur at sharply defined places, nor do they all occur at the same place or at the same rate. Some lakes may be considered oligotrophic by one criterion and eutrophic by another; this problem isread more
Citations
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Journal ArticleDOI
Response of bacterial communities to cyanobacterial harmful algal blooms in Lake Taihu, China.
TL;DR: Potential associations exist between toxic cyanobacterial blooms and bacterial communities but more investigations are needed to obtain a mechanistic understanding of their complex relationships, and significant negative relationships were found between alpha biodiversity indices and Microcystis abundance as well as with intracellular MC concentrations.
Journal ArticleDOI
The relationship between salinity, suspended particulate matter and water clarity in aquatic systems
TL;DR: In this paper, an empirically based new model quantifying the relationship between salinity, suspended particulate matter (SPM) and water clarity (as given by the Secchi depth) and an empirical model for oxygen saturation in the deep-water zone for coastal areas (O2Sat in %).
Journal ArticleDOI
Landscape heterogeneity impacts water chemistry, nutrient regime, organic matter and chlorophyll dynamics in agricultural reservoirs
Usman Atique,Kwang-Guk An +1 more
TL;DR: In this article, the seasonal and temporal variabilities of nutrients, chlorophyll (Chl-a) and some other parameters in 95 agricultural reservoirs influenced by the Asian monsoon during 2008-2017, and elucidates the links of water chemistry dynamics to landscape heterogeneity.
Journal ArticleDOI
Restoration of a Mine Pit Lake from Aquacultural Nutrient Enrichment
Richard P. Axler,Shane Yokom,Craig A Tikkanen,Craig A Tikkanen,Michael P. McDonald,Henry Runke,Dwight Wilcox,Bruce Cady +7 more
TL;DR: A water quality controversy resulted over the potential for long-term degradation of the lakes and regional aquifer, and the Minnesota Pollution Control Agency then mandated that aquaculture be terminated in Twin City-South in May 1993 and the lake restored to preaquaculture conditions by 1996 as mentioned in this paper.
Journal ArticleDOI
The surface waters component of the Environmental Monitoring and Assessment Program (EMAP): an overview
TL;DR: The Environmental Monitoring and Assessment Program (EMAP) as discussed by the authors monitors and assesses the ecological health of major ecosystems, including surface waters, forests, near-coastal waters, wetlands, agricultural lands, arid lands, and the Great Lakes, in an integrated, systematic manner.
References
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Journal ArticleDOI
The phosphorus‐chlorophyll relationship in lakes1,2
P. J. Dillon,F. H. Rigler +1 more
TL;DR: In this article, data for summer chlorophyll and spring total phosphorus concentration were collected from 19 lakes in southern Ontario and combined with data reported in the literature for other North American lakes to produce a regression line that can be used to predict the average summer CHP from a single measurement of phosphorus concentration at spring overturn.
Journal ArticleDOI
Environmental control of photosynthesis in the sea
TL;DR: In this article, a theoretical equation for the photosynthesis-light relation is developed which includes the effects of inhibition in intense light, assuming that phytoplankton adapts to seasonal light changes and that nutrient deficiency affects the carbon:chlorophyll ratio of natural phyto-ankton populations.
Journal Article
Primary production by phytoplankton community in some Japanese lakes and its dependence on lake depth
Journal ArticleDOI
Phosphorus, Nitrogen, and Algae in Lake Washington after Diversion of Sewage
TL;DR: After diversion of sewage effluent from Lake Washington, winter concentrations of phosphate and nitrate decreased at different rates, but nitrate remained at more than 80 percent of the 1963 value and free carbon dioxide and alkalinity remained relatively high.