نتایج جستجو برای: eutrophication

تعداد نتایج: 4268  

Journal: :Environmental science and pollution research international 2003
Val H Smith

GOAL, SCOPE AND BACKGROUND Humans now strongly influence almost every major aquatic ecosystem, and their activities have dramatically altered the fluxes of growth-limiting nutrients from the landscape to receiving waters. Unfortunately, these nutrient inputs have had profound negative effects upon the quality of surface waters worldwide. This review examines how eutrophication influences the bi...

2006
Robert W. Howarth Roxanne Marino

The first special volume of Limnology and Oceanography, published in 1972, focused on whether phosphorus (P) or carbon (C) is the major agent causing eutrophication in aquatic ecosystems. Only slight mention was made that estuaries may behave differently from lakes and that nitrogen (N) may cause eutrophication in estuaries. In the following decade, an understanding of eutrophication in estuari...

Journal: :تولید گیاهان زراعی 0
بهروز اسماعیل پور دانشگاه محقق اردبیلی سرور خرم دل دانشگاه فردوسی مشهد- دانشکده کشاورزی افسانه امین غفوری دانشگاه پیام نور قوچان

life cycle assessment (lca) had proven to be an appropriate assessment tool for analysis of agri-food products by identifying, quantifying and evaluating the resources consumed and emissions released into the environment. this study was performed for evaluation the environmental impacts of potato agroecosystems based on nitrogen levels by using lca methodology. tuber yield mean during 1999-2013...

Journal: :iranian journal of health sciences 0
mohammad rafiee department of environmental health engineering, school of public health, shahid beheshti universityof medical sciences, tehran, iran mahsa jahangiri-rad young researchers and elites club, science and research branch, islamic azad university, tehran, iran

abstract background and purpose: eutrophication is one of the major environmental problems in waterways causing substantial adverse impact on domestic, livestock and recreational use of water resources. aras dam, iran which provides arasful city with drinking water, has chronic algal blooms since 1990. levels of up to 900,000 cells/ml of toxic cyanobacteria (mainly anabaena and microcystis) hav...

2017
Tyler Wagner Larry E. Erickson

Eutrophication of lakes and reservoirs is a major water quality problem that poses significant environmental, economic and social threats around the world. Monitoring and managing lakes and reservoirs to prevent or limit eutrophication, therefore, has significant value. The literature has been reviewed to study ecological engineering and management methods that have been and can be applied to i...

Journal: :Biology letters 2007
Jan Heuschele Ulrika Candolin

Human-induced eutrophication is a serious environmental problem that constrains visual communication and influences the mate choice process in fishes. Eutrophication also changes the chemical environment and the pH of the water, which could influence the use of olfactory cues in mate choice. Here, we show that an increase in pH enhances the use of male olfactory cues in mate choice in three-spi...

2015
Brian F. Cumming Kathleen R. Laird Irene Gregory-Eaves Kyle G. Simpson Michael A. Sokal Rick N. Nordin Ian R. Walker

Citation: Cumming BF, Laird KR, Gregory-Eaves I, Simpson KG, Sokal MA, Nordin RN and Walker IR (2015) Tracking past changes in lake-water phosphorus with a 251-lake calibration dataset in British Columbia: tool development and application in a multiproxy assessment of eutrophication and recovery in Osoyoos Lake, a transboundary lake in Western North America. Front. Ecol. Evol. 3:84. doi: 10.338...

Journal: :Science 1971
J H Ryther W M Dunstan

The distribution of inorganic nitrogen and phosphorus and bioassay experiments both show that nitrogen is the critical limiting factor to algal growth and eutrophication in coastal marine waters. About twice the amount of phosphate as can be used by the algae is normally present. This surplus results from the low nitrogen to phosphorus ratio in terrigenous contributions, including human waste, ...

Eutrophication is considered as a serious problem in water reservoirs. Awareness about the eutrophic status of each reservoir could help in providing a better understanding of the problem in a global scale. The present study was conducted to assess temporal and spatial eutrophication index in a water reservoir (Sahand dam) in the northwest of Iran. Physico-chemical parametres that are effective...

ژورنال: بوم شناسی آبزیان 2017

One of the most important issues in environmental management of coastal waters is the evaluation of Eutrophication. In this study, the trophic status of coastal waters of Hormozgan province was evaluated using Scale (TRIXCS) and Unscale (UNTRIXCS) trophic indices in 2012. The results showed that TRIXCS values were in the range of 3.6 to 5.9 (in the area 1 Mezo-Eutroph, areas 2 and 3 Mezotroph, ...

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