Evaluation of factors related to increased zooplankton biomass and altered species composition following impoundment of a Newfoundland reservoir

1998 ◽  
Vol 55 (1) ◽  
pp. 230-238 ◽  
Author(s):  
Christine E Campbell ◽  
Roy Knoechel ◽  
Douglas Copeman
Keyword(s):  
Species Composition ◽  
Primary Productivity ◽  
Retention Time ◽  
Phytoplankton Biomass ◽  
Water Retention ◽  
Zooplankton Community ◽  
Zooplankton Biomass ◽  
Nutrient Concentrations ◽  
Water Retention Time ◽  
Daphnia Catawba

Zooplankton biomass and species composition were monitored in Cat Arm Lake and Reservoir on Newfoundland's Great Northern Peninsula from 1983 to 1993. Zooplankton biomass increased approximately 19-fold in the oligotrophic reservoir following impoundment in 1984, relative to biomass in the preexisting lake. Microcrustaceans Cyclops scutifer and Daphnia dubia, either rare or absent from Cat Arm Lake prior to impoundment, were consistently measurable components of the zooplankton community by 1993. Similar changes elsewhere have been attributed to both increased water retention time and enhanced phytoplankton biomass, factors whose effects are usually interdependent. In Cat Arm, there were no increases in either phytoplankton biomass or primary productivity during the first 3 years of impoundment, and natality of the dominant cladoceran, Daphnia catawba, did not increase. Summer water retention time increased from preimpoundment levels of 4 days in 1983 to 338 days in 1993. Zooplankton biomass was significantly correlated with water retention time (Spearman's rs = 0.72, p = 0.04) and showed no significant correlation with phytoplankton biomass, primary productivity, nutrient concentrations, pH, colour, or epilimnetic temperature. Changes in the zooplankton community in this subarctic system can thus be attributed most directly to a decrease in losses due to washout.

scholarly journals Long-Term Variations in Chlorophyllaand Primary Productivity in Jiaozhou Bay, China

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Baodong Wang ◽  
Zongling Wang
Keyword(s):  
Primary Productivity ◽  
Linear Response ◽  
Phytoplankton Biomass ◽  
Jiaozhou Bay ◽  
Zooplankton Biomass ◽  
Nutrient Concentrations ◽  
Period Analysis ◽  
Term Data ◽  
Long Term Variations

Based on long-term data of measurements of nutrient and chlorophyllaconcentrations as well as estimates of primary production, the response of phytoplankton to nutrient enrichment was evaluated in the highly urbanized Jiaozhou Bay. Results showed that phytoplankton biomass, as indicated by chlorophyllaconcentration, did not show a direct linear response to increased nutrient concentrations. Instead, chlorophyllaconcentration was maintained at a constant level in the last two decades in Jiaozhou Bay, so did primary productivity. However, a reduction of zooplankton biomass was observed during the same period. Analysis showed that although the scale of phytoplankton blooms might be limited by availability of silicate due to low Si/N ratio and low concentration, top-down control on phytoplankton biomass by bivalve grazing may be an important factor in Jiaozhou Bay ecosystem.

scholarly journals Wastewater Discharge through a Stream into a Mediterranean Ramsar Wetland: Evaluation and Proposal of a Nature-Based Treatment System

2021 ◽  
Vol 13 (6) ◽  
pp. 3540
Author(s):  
Jesús de-los-Ríos-Mérida ◽  
Francisco Guerrero ◽  
Salvador Arijo ◽  
María Muñoz ◽  
Inmaculada Álvarez-Manzaneda ◽  
...  
Keyword(s):  
Retention Time ◽  
Water Retention ◽  
Treatment Plant ◽  
Treated Wastewater ◽  
Nutrient Concentrations ◽  
Systematic Sampling ◽  
Zooplankton Abundance ◽  
Water Retention Time ◽  
Wetland Evaluation ◽  
The Impact

Impacts on wetlands are becoming more pressing every day. Among them, habitat loss, overexploitation of aquifers and changes in land use are considered the most important. However, the impacts linked to wastewater discharges are increasing worldwide. In this context, this study analyses the impacts of input of wastewater to a Mediterranean Ramsar temporary wetland (Fuente de Piedra, south of Spain). To this end, systematic sampling was carried out in the Charcón stream which receives water from a wastewater treatment plant (WWTP) and discharges it into the wetland. The results showed a slight decrease in the nutrient concentrations, particularly for nitrogen compounds. Heterotrophic and fecal bacteria concentration, as well as phytoplankton and zooplankton abundance and biomass, all significantly decreased from the treatment plant to the wetland. When comparing the effect of this discharge with other similar occurring to the same wetland, it was evident that the Charcón stream was responsible for a greater impact. At this point, it is relevant to note that the main difference among both treated wastewater discharges lies in the different water retention time once the wastewater was released from the WWTP. In fact, we recommend an increase in the water retention time by building seminatural ponds, together with the use of biofilters, which will notably contribute to improve the processes of assimilation of nutrients and to decrease the impact generated in the wetland by this spill.

Effect of Water Body Morphology on Phytoplankton Biomass and Species Composition

2013 ◽  
Vol 777 ◽  
pp. 375-379
Author(s):  
Yue Hong Zhang ◽  
Fei Peng Li ◽  
Hu Hu Zhao ◽  
Hai Ping Zhang
Keyword(s):  
Species Composition ◽  
Water Body ◽  
Environmental Variables ◽  
Phytoplankton Biomass ◽  
Population Variation ◽  
Nutrient Concentrations ◽  
Body Morphology ◽  
Key Factor ◽  
Lake Type ◽  
River Type

Environmental variables, phytoplankton biomass and species composition in Nanhu Lake in Yingdong Village, Chongming Island were monitored from August 2010 to September 2011. The relationship between environmental variables and population variation of phytoplankton was discussed. The results showed that water body morphology was the key factor leading to the variation of phytoplankton community. In river-type waters the level of phytoplankton biomass was generally higher than that in lake-type waters, especially in summer. During the period of seasonal change, in river-type waters Cyanophyta dominated longer with the succession from Cyanophyta to Chlorophyta and Bacillariophyta occurred later than that in lake-type waters. Redundancy analysis (RDA) indicated that the morphology of enclosed waters had influence on phytoplankton biomass and species composition. One of the mechanisms may be that water body morphology could have impact on the growth and species dynamics of phytoplankton indirectly by affecting nutrient concentrations.

The effects of water retention time and watershed features on the limnology of two tropical reservoirs in Brazil

2008 ◽  
Vol 13 (4) ◽  
pp. 257-269 ◽  
Author(s):  
Maria Carolina S. Soares ◽  
Marcelo M. Marinho ◽  
Vera L. M. Huszar ◽  
Christina W. C. Branco ◽  
Sandra M. F. O. Azevedo
Keyword(s):  
Retention Time ◽  
Water Retention ◽  
Tropical Reservoirs ◽  
Water Retention Time

scholarly journals Experiment in infiltration studies as a water treatment process

2018 ◽  
Vol 59 ◽  
pp. 00015
Author(s):  
Sylwia Kołaska ◽  
Joanna Jeż-Walkowiak ◽  
Zbysław Dymaczewski
Keyword(s):  
Water Treatment ◽  
Temperature Variation ◽  
Retention Time ◽  
Research Methodology ◽  
Water Retention ◽  
Treatment Process ◽  
Water Infiltration ◽  
Infiltration Process ◽  
Water Treatment Process ◽  
Water Retention Time

This article contains the concept of research methodology of the water infiltration process. The described research was conducted at Dębina intake in Poznan, Poland. Based on the temperature variation curves, it was possible to determine the water retention time in the ground during the flow of water from the infiltration pond through piezometers to the collecting well

scholarly journals Morphometry Dynamical of Siombak Lake, Medan Indonesia

Omni-Akuatika ◽  
2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Ahmad Muhtadi ◽  
Zulham Apandy Harahap ◽  
Rusdi Leidonald
Keyword(s):  
Physical Characteristic ◽  
Retention Time ◽  
Water Retention ◽  
Average Depth ◽  
Lake Morphometry ◽  
Dynamical Study ◽  
Maximum Width ◽  
Lake Volume ◽  
First Impression ◽  
Water Retention Time

Siombak lake (28 ha area) was a salty lake located in Medan coastal, Indonesia. Water fluctuation influenced by the sea tide. Therefore, it needed to do morphometry dynamical study as the first impression of lake physical characteristic. The purpose of this study was to understand the dynamical of Siombak lake morphometry. The research was done in September 2016. Lake mapping was done by making 100 line zig zag and draw with ArcMap. Bathymetry showed that the bottom of the lake was sloping at the center part of west and southeast of the lake, and steeping at north, south and east. Siombak Lake has shoreline length 2,535.78 m, with SDI value 2.70. Maximum length 756 m, with maximum width 246.15 m. Lake maximum depth was 17.7 m at MSL, 18.98 m at highest tide and 16.71 m at lowest tide, with average depth 5.33 m at MSL, 6.30 m at highest tide and 4.30 m at lowest tide. Lake volume was 783,607.16 m3 at MSL, 829,395.52 m3 at highest tide and 355,544.14 m3 at lowest tide, with water debit around 32.50 – 50.17 m3s-1. Water retention time was ± 4.33 – 6.75 hours

Riverine water transformation during retention in small lowland reservoirs

2009 ◽  
Vol 38 (4) ◽  
Author(s):  
Tomasz Suchowolec ◽  
Andrzej Górniak
Keyword(s):  
Retention Time ◽  
Water Retention ◽  
Riverine Water ◽  
Dam Reservoirs ◽  
Water Retention Time ◽  
Lowland Reservoirs ◽  
Northeastern Poland ◽  
Phosphorus Sedimentation ◽  
Almost All ◽  
Phosphorus Reduction

Riverine water transformation during retention in small lowland reservoirsSix small dam reservoirs in northeastern Poland, with different hydrologic and catchment characteristics were selected for research from March to October (2001-2003). There was a significant correlation between DOC and TP in the reservoirs and the water retention time (WRT). The highest values of electrical conductivity (EC) were recorded in reservoirs with an agricultural basin. In almost all reservoirs a statistically significant decrease of EC, compared to inflowing waters, was noted. Nitrates were substantially reduced in afforested catchment reservoirs. The highest TP concentration was recorded in a newly flooded reservoir. In reservoirs with long retention time, phosphorus sedimentation takes place more intensively. This caused phosphorus reduction in outflowing waters.

scholarly journals A Novel Statistical Model for Water Age Estimation in Water Distribution Networks

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Wei-ping Cheng ◽  
En-hua Liu ◽  
Jing-qing Liu
Keyword(s):  
Statistical Model ◽  
Retention Time ◽  
Water Distribution ◽  
Water Retention ◽  
Distribution Networks ◽  
Water Distribution Networks ◽  
Residual Chlorine ◽  
Water Age ◽  
Important Indicator ◽  
Water Retention Time

The water retention time in the water distribution network is an important indicator for water quality. The water age fluctuates with the system demand. The residual chlorine concentration varies with the water age. In general, the concentration of residual chlorine is linearly dependent on the water demand. A novel statistical model using monitoring data of residual chlorine to estimate the nodal water age in water distribution networks is put forward in the present paper. A simplified two-step procedure is proposed to solve this statistical model. It is verified by two virtual systems and a practical application to analyze the water distribution system of Hangzhou city, China. The results agree well with that from EPANET. The model provides a low-cost and reliable solution to evaluate the water retention time.

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