An ecological evaluation of heated water discharge on phytoplankton blooms in the Potomac River

Hydrobiologia ◽  
1974 ◽  
Vol 45 (4) ◽  
pp. 441-465 ◽  
Author(s):  
George M. Simmons ◽  
Brian J. Armitage ◽  
John C. White
Keyword(s):  
Water Discharge ◽  
Potomac River ◽  
Phytoplankton Blooms ◽  
Ecological Evaluation ◽  
Heated Water

scholarly journals Seasonal variability of phytoplankton blooms in the coastal waters along the East coast of India

2014 ◽  
Vol XL-8 ◽  
pp. 1065-1071 ◽  
Author(s):  
T. Preethi Latha ◽  
K. H. Rao ◽  
E. Amminedu ◽  
P. V. Nagamani ◽  
S. B. Choudhury ◽  
...  
Keyword(s):  
Fresh Water ◽  
Bay Of Bengal ◽  
Coastal Waters ◽  
Algal Blooms ◽  
East Coast ◽  
Water Discharge ◽  
Marine Ecosystem ◽  
Chlorophyll Concentration ◽  
Phytoplankton Blooms ◽  
East Coast Of India

Bay of Bengal (BOB) is a semi enclosed tropical basin located in the north eastern part of the Indian Ocean with high influence of fresh water discharge from major rivers and rainfall. Bay of Bengal (BOB) is highly influenced by monsoons and represents a natural laboratory to study the effect of fresh water fluxes on the marine ecosystem. Bay of Bengal (BOB) is very low in productivity often with the observations of Phytoplankton Blooms. Phytoplankton blooms are one of the prominent features of biological variability in the coastal ecosystems such as estuaries, lagoons, bays, and tidal rivers with rapid production and accumulation of phytoplankton biomass in the ocean. These blooms usually respond to changing physical forcings originating in the coastal ocean like tides, currents and river runoff and to the atmospheric forcing like wind. These physical forcings have different timescales of variability, so algal blooms can be short-term episodic events, recurrent seasonal phenomena, or rare events associated with exceptional climatic or hydrologic conditions. Bloom events and their variability on spatial & temporal scales monitoring through field measurements is difficult. Based on this key hypothesis an effort is made to understand the seasonal and spatial variability of Phytoplankton Blooms along the East Coast of India. In this paper we present the bloom dynamics in their context to the chlorophyll concentration along with species composition and abundance in estuarine and near shore coastal waters of Godavari basin using Oceansat-2 Ocean Colour Monitor (OCM). The initial results revealed that the quasi permanent phytoplankton blooms initiates in the month of mid- February and evolves for a period of two months and then slowly starts decaying by the mid of May month. The results also stand as a base for the study of influence of Phytoplankton Blooms on the carbon flux estimations and bio-geo-chemical processes in the Bay of Bengal.

Calculation of Coaxial Heated Water Discharge

1983 ◽  
Vol 109 (10) ◽  
pp. 1380-1385 ◽  
Author(s):  
Michael A. Leschziner ◽  
Wolfgang Rodi
Keyword(s):  
Water Discharge ◽  
Heated Water

scholarly journals Effect of Anthropogenic Factors on the Ecosystem of the Yenisei River Anabranch within the City of Krasnoyarsk

2021 ◽  
pp. 208-237
Author(s):  
Elena S. Kravchuk
Keyword(s):  
Primary Production ◽  
Water Flow ◽  
Water Discharge ◽  
Freshwater Ecosystems ◽  
Anthropogenic Factors ◽  
Economic Damage ◽  
Yenisei River ◽  
Heated Water ◽  
The Yenisei River ◽  
Water Plants

In recent decades, freshwater ecosystems have regularly experienced blooms of green algae (green tides), causing environmental and economic damage. Blooms of green alga Spirogyra sp. occur in the ‘Abakanskaya’ anabranch of the Yenisei River in summer months. The anabranch is influenced by several anthropogenic factors: construction of a dam in the upper reaches; heated water discharge from a thermal power plant; fish farming. The aim of this study was to assess the impact of anthropogenic factors on the ecosystem of the Abakanskaya anabranch and to identify the main factors favoring Spirogyra sp. blooms. Samples were taken in May-September 2018-2019 at four sites: 1 – upstream of the dam (control), 2 – downstream of the dam, 3 – near the point of heated water discharge, 4 – downstream of the fish farm. Physical and chemical parameters, biomass and species composition of phytoplankton, phytoperiphyton, zooplankton, zoobenthos, and higher water plants, gross primary production (GPP), nitrogen content in biomass of periphyton, higher plants, and zoobenthos were studied. The main factor that caused changes in the community was that there was no water flow in the anabranch because of the low capacity of the dam drainage pipes. While upstream of the dam most ecosystem features were within the limits typical for this part of the Yenisei River, downstream of the dam, the system seemed to change from lotic to lentic: percentage of motile forms of phytoplankton, biomass of zooplankton, percentage of true zooplankton species, taxon number and taxonomic diversity of zooplankton and zoobenthos became higher; phytoperiphyton primary production rose (because of Spirogyra sp. bloom); higher water plants thrived. The other investigated factors, namely, thermal, nutrient, and organic pollution evidently produced combined effect on the ecosystem because of the absence of water flow, and their specific effects were not obvious

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