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
Quantification of chlorophyll-a in typical lakes across China using Sentinel-2 MSI imagery with machine learning algorithm.
Sijia Li,Kaishan Song,Shuai Wang,Ge Liu,Zhidan Wen,Yingxin Shang,Lili Lyu,Fangfang Chen,Shiqi Xu,Hui Tao,Yunxia Du,Chong Fang,Guangyi Mu +12 more
TL;DR: Wang et al. as mentioned in this paper integrated a broad scale dataset of lake biogeochemical characteristics using multispectral imager (MSI) product to seamlessly retrieve the Chlorophyll-a concentration.
Journal ArticleDOI
Benthic oxygen demand in Lake Apopka, Florida
TL;DR: The benthic oxygen demand of Lake Apopka, Florida was determined using laboratory core uptake and flow through system techniques as discussed by the authors, which indicated that the oxygen uptake was primarily biological, with bacterial respiration dominating.
Journal ArticleDOI
Effects of Watershed Land Use and Lake Morphometry on the Trophic State of Chinese Lakes: Implications for Eutrophication Control
TL;DR: Wang et al. as mentioned in this paper examined the relative effects of watershed land use and lake morphology on the trophic state of 19 lakes in the Yunnan plateau and lower Yangtze floodplain, the two most eutrophic regions in China.
Journal ArticleDOI
High-frequency remote monitoring of large lakes with MODIS 500 m imagery
TL;DR: In this paper, the authors developed and evaluated a remote monitoring protocol for water clarity of large lakes using MODIS 500m data and compared MODIS utility to Landsat-based methods, finding that the utility of MODIS data in remote water quality estimation lies in intra-annual monitoring of lake water clarity in inaccessible, large lakes.
Journal ArticleDOI
Are investments to promote biodiversity conservation and ecosystem services aligned
Stephen Polasky,Kris A. Johnson,Bonnie L. Keeler,Kent Kovacs,Erik J. Nelson,Derric Pennington,Andrew J. Plantinga,John C. Withey +7 more
TL;DR: In this paper, the degree of alignment between ecosystem services and biodiversity conservation strategies was investigated using data from the state of Minnesota, USA, where voters recently passed an initiative that provides approximately $171m annually in dedicated funding for conservation.
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.