Biological and physicochemical characteristics of the Ross River Dam, Townsville

1982 ◽  
Vol 33 (5) ◽  
pp. 811 ◽  
Author(s):  
CM Finlayson ◽  
JC Gillies
Keyword(s):  
Water Quality ◽  
Water Level ◽  
Chlorophyll A ◽  
Aquatic Vegetation ◽  
Physicochemical Characteristics ◽  
Artificial Lake ◽  
Management Planning ◽  
Nitrogen Concentrations ◽  
Low Nitrogen ◽  
Future Management

The biological and physicochemical characteristics of the Ross River Dam, an artificial lake near Townsville in northern Queensland, are described. The lake is characterized by a sodium and chloride ionic dominance, may be polymictic, and contains a relatively low ratio of total phosphorus to total nitrogen due to the low nitrogen concentrations. The aquatic vegetation is widespread and dominated by the submerged Hydrilla verricillata and Potamogeton javanicus. Both species are plentiful in the lake but are not, at present, major weeds. The phytoplankton were not found in bloom conditions despite chlorophyll a concentrations near 10 mg m-3. The main fish species of 11 recorded was Glossamia gilli. The results from this survey will provide a useful basis for future management planning, especially if the water level or water-quality conditions were to vary.

Eutrophication study of twenty reservoirs in Taiwan

2001 ◽  
Vol 44 (6) ◽  
pp. 19-26 ◽  
Author(s):  
S. -P. Chang ◽  
S. -M. Chuang
Keyword(s):  
Water Quality ◽  
Nutrient Limitation ◽  
Chlorophyll A ◽  
Total Nitrogen ◽  
Secchi Disc ◽  
Study Results ◽  
Limiting Nutrient ◽  
Nitrogen Concentrations ◽  
North Latitude

Taiwan is an island off the southeastern coast of China with total area of roughly 36,000 km2. The geographic position of Taiwan is between 21° 45′ 25″ to 25° 56′ 31″ north latitude and 119° 18′ 3″ to 124° 34′ 30″ east longitude and includes both tropical and subtropical areas. The study was carried out at twenty main reservoirs in Taiwan area from 1994 to 1998. The study revealed that the water quality of most reservoirs gradually deteriorated during the study period. Total phosphorus concentrations over 60 μg/L were observed in 12.5% of these reservoirs in 1994, but in 22.2% of these reservoirs in 1998. Total nitrogen concentrations over 1.0 mg/L were observed in 37.5% of these reservoirs in 1994, but in 94.4% of these reservoirs in 1998. Secchi disc transparency below 2 m was observed in 75% of these reservoirs in 1994, but in 83.3% of these reservoirs in 1998. Chlorophyll a concentrations over 15 mg/m3 were observed in 12.5% of these reservoirs in 1994, but in 27.8% of these reservoirs in 1998. The TN:TP mass ratios (wt/wt) of all the studied reservoirs except Akungting Reservoir, Fongshan Reservoir, and Chengching Reservoir are higher than 16. The study results on nutrient limitation indicated that phosphorus is the primary limiting nutrient in Taiwan reservoirs except Akungting Reservoir, Fongshan Reservoir, and Chengching Reservoir.

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