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
More filters
Journal ArticleDOI
Application of Machine Learning for eutrophication analysis and algal bloom prediction in an urban river: A 10-year study of the Han River, South Korea.
Quang Viet Ly,Xuan Cuong Nguyen,Ngoc C. Lê,Tien-Dung Truong,T. H. Hoang,Tae Jun Park,Tahir Maqbool,JongCheol Pyo,Kyung Hwa Cho,Kwang-Sik Lee,Jin Hur +10 more
TL;DR: In this paper, the authors applied different Machine Learning (ML) algorithms to suggest the best option for algal bloom prediction in the Han River, a large river in South Korea.
Journal ArticleDOI
Classifying lakes to improve precision of nutrient–chlorophyll relationships
Lester L. Yuan,Amina I. Pollard +1 more
TL;DR: In this paper, an approach for classifying lakes and reservoirs that can improve estimates of the relationships between total P (TP) and chlorophyll a (chl a) concentration, while preserving a model that can be readily interpreted by environmental managers and stakeholders.
Journal ArticleDOI
Pollutant Loading Capacity for the Black River, Chehalis River System, Washington
TL;DR: In this paper, the effect of biochemical oxygen demand (BOD), ammonia, and nutrient loads on DO in the Black River was evaluated using the WASP5 model and a TMDL was proposed for BOD and ammonia that would prevent significant degradation of DO.
Journal ArticleDOI
Seasonal changes of water quality in a tropical shallow and eutrophic reservoir in the metropolitan region of Recife (Pernambuco-Brazil)
Fábio Henrique Portella Corrêa de Oliveira,André L.S. Capela E Ara,César Henrique Pinto Moreira,Osman de Oliveira Lira,Maria do Rosário de Fátima Padilha,Neide Kazue Sakugawa Shinohara +5 more
TL;DR: Investigation in an urban eutrophic reservoir in Northeastern Brazil found that seasonality exerted some influence on both biotic and abiotc variables, leading to changes in water quality of the reservoir.
Journal ArticleDOI
Advances in understanding calcite varve formation: new insights from a dual lake monitoring approach in the southern Baltic lowlands
Patricia Roeser,Nadine Dräger,Dariusz Brykała,Florian Ott,Sylvia Pinkerneil,Piotr Gierszewski,Christin Lindemann,Birgit Plessen,Brian Brademann,Michał Kaszubski,Michał Fojutowski,Markus J. Schwab,Michał Słowiński,Mirosław Błaszkiewicz,Achim Brauer +14 more
References
More filters
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.