scholarly journals Influences on Water Quality and Abundance of Cladophora, a Shore-Fouling Green Algae, over Urban Shoreline in Lake Ontario

Water ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1569 ◽  
Author(s):  
E. Howell
Keyword(s):  
Water Quality ◽  
Water Column ◽  
Green Algae ◽  
Nutrient Loading ◽  
Inorganic Nitrogen ◽  
Control Plant ◽  
Algal Growth ◽  
Lake Ontario ◽  
External Loading ◽  
Western Lake

Urban centers border western Lake Ontario, the terminus of the Laurentian Great Lakes, impacting water quality on the shores of this oligotrophic lake. The green algae Cladophora proliferates on the shallow lakebed and fouls the shoreline, presenting an eutrophication concern. The conditions over a typical urbanized shoreline were studied to assess linkages between Cladophora and area nutrient sources. The most pervasive of the mixing areas of varying extent identified using field sensor measurements was associated with the discharge of treated sewage from a Water Pollution Control Plant (WPCP). Phosphorus and nitrogen were enriched at times near the WPCP diffuser and also in shallow water along the shoreline. Dissolved nutrients were also measured directly above the lakebed in close proximity to Cladophora. Dissolved phosphorus and inorganic nitrogen were higher in proximity to the WPCP diffuser at times, however, spatial patterns were not as clearly aligned with external inputs as the patterns of enrichment in the water column. Biomass distribution of Cladophora was unrelated to nutrient levels in the water column or at the lakebed. Yet, concentrations of phosphorus in Cladophora, an indicator of nutrient sufficiency, were higher near the WPCP diffuser. This disparity, while possibly an artifact of variable loss rates of biomass among locations, may in part stem from variable water clarity among areas. Abundant dreissenid mussels also potentially obscure the effects of nutrient loading on algal biomass if the sequestering of phosphorus from offshore plankton, suggested by periods of onshore circulation, approaches the extent of external loading. Further study of phosphorus flux at the lakebed is required to establish clear linkages between external nutrient loading and algal growth in order to manage the proliferation of Cladophora over urban coastline.

scholarly journals Phytoplankton from Vam Co River in Southern Vietnam

2016 ◽  
Vol 5 (1) ◽  
pp. 113
Author(s):  
Thanh-Son Dao ◽  
Thi-Nhu-Phuong Bui
Keyword(s):  
Water Quality ◽  
Green Algae ◽  
Quality Evaluation ◽  
Nitrate Concentration ◽  
Inorganic Nitrogen ◽  
Environmental Parameters ◽  
Water Quality Assessment ◽  
Species Number ◽  
Dissolved Phosphorus ◽  
Southern Vietnam

<p class="emsd"><span lang="EN-GB">In this study we investigated the variation of phytoplankton and the water quality in Vam Co River, Southern Vietnam. Phytoplankton were bi-monthly monitored in 2011 at 12 sampling sites in the river. Some basic environmental parameters were also monitored including temperature, pH, turbidity, inorganic nitrogen and dissolved phosphorus. The phytoplankton biodiversity and Diatomeae indices were applied for environmental quality evaluation. The results showed that temperature </span><span lang="EN-GB">ranged from 28.7 – 31.9 </span><span lang="EN-GB">°C during the monitoring. The pH and turbidity were in between 3.9 – 7.0 and 2 – 64 NTU, respectively. The nitrate and ammonium concentrations were from 0.06 – 1.21 and 0.03 – 1.15 mg/L, respectively. The phosphate concentration was between 0.02 and 0.37 mg/L. </span><span lang="EN-GB">The environmental parameters were favorable for phytoplankton development. The phytoplankton analyses showed that there were 290 species of diatoms, green algae, golden algae, yellow algae, euglenoids, dinoflagellates and cyanobacteria of which green algae and diatoms were dominant in species number. </span><span lang="EN-GB">Phytoplankton density ranged from 920 – 383 600 individuals/L with the main dominant species of diatoms. The biodiversity index values during the monitoring were from 0.15 – 3.80 characterized for oligotrophic to eutrophic conditions whereas the Diatomeae index values were more than 0.2 indicating for the eutrophic characteristic of the aquatic environment. Besides, phytoplankton species number positively correlated with temperature but negatively correlated with nitrate concentration. Additionally, the biodiversity positively correlated with temperature and species number, but negatively correlated with nitrate and phytoplankton abundance. The results confirmed the advantage of using phytoplankton and their indices for environmental monitoring and water quality assessment.</span></p><p> </p>

Hydrodynamics and water quality in western Lake Ontario

2012 ◽  
Vol 38 ◽  
pp. 91-98 ◽  
Author(s):  
Yerubandi R. Rao ◽  
J.E. Milne ◽  
C.H. Marvin
Keyword(s):  
Water Quality ◽  
Lake Ontario ◽  
Western Lake

Linkage between Epilithic Algal Growth and Water Column Nutrients in Softwater Lakes

1992 ◽  
Vol 49 (8) ◽  
pp. 1641-1649 ◽  
Author(s):  
G. Winfield Fairchild ◽  
John W. Sherman
Keyword(s):  
Nutrient Limitation ◽  
Water Column ◽  
Chlorophyll A ◽  
Standing Crop ◽  
Crop Production ◽  
Dissolved Inorganic Carbon ◽  
Inorganic Nitrogen ◽  
Algal Growth ◽  
Acidic Lakes ◽  
Softwater Lakes

We examined the dependence of epilithic algal standing crop, production, and nutrient limitation upon water column nutrients in 12 softwater lakes of northeastern Pennsylvania. Elevated dissolved inorganic nitrogen accompanied low dissolved inorganic carbon in the more acidic lakes, while P varied little within the study area. The growth of epilithon on clay flower pot substrata diffusing combinations of N (NaNO3), P (Na2HPO4), and C (NaHCO3) was compared with growth on control substrata to evaluate which of the three nutrients limited growth in each lake. Standing crop accrual as chlorophyll a on control substrata averaged 0.8 μg/cm2, with little variation among lakes. Nutrient limitation of growth, however, was strongly related to lake alkalinity. Chlorophyll a was typically enhanced by N and/or P only in lakes with alkalinity greater than ~100 μeq/L and responded strongly to C enrichment in the two most acidic lakes. Combined addition of all three nutrients produced the largest chlorophyll a accrual in all 12 lakes. Invertebrate grazer biomass, dominated by chironomids in the more acidic lakes and by snails at higher alkalinity, was negatively related to chlorophyll a on these NPC substrata (r = −0.57, p = 0.05) and may have reduced algal standing crop well below nutrient-sustainable levels in some lakes.

scholarly journals Seasonal dissolved inorganic nitrogen and phosphorus budgets for two sub-tropical estuaries in south Florida, USA

2013 ◽  
Vol 10 (10) ◽  
pp. 6721-6736 ◽  
Author(s):  
C. Buzzelli ◽  
Y. Wan ◽  
P. H. Doering ◽  
J. N. Boyer
Keyword(s):  
Nutrient Loading ◽  
Inorganic Nitrogen ◽  
River Estuary ◽  
South Florida ◽  
External Loading ◽  
Dissolved Inorganic Nitrogen ◽  
Nutrient Inputs ◽  
Wet Season ◽  
Nitrogen And Phosphorus ◽  
Annual Variations

Abstract. Interactions among geomorphology, circulation, and biogeochemical cycling determine estuary responses to external nutrient loading. In order to better manage watershed nutrient inputs, the goal of this study was to develop seasonal dissolved inorganic nitrogen (DIN) and phosphorus (DIP) budgets for the two estuaries in south Florida, the Caloosahatchee River estuary (CRE) and the St. Lucie Estuary (SLE), from 2002 to 2008. The Land–Ocean Interactions in the Coastal Zone (LOICZ) approach was used to generate water, salt, and DIN and DIP budgets. Results suggested that internal DIN production increases with increased DIN loading to the CRE in the wet season. There were hydrodynamic effects as water column concentrations and ecosystem nutrient processing stabilized in both estuaries as flushing time increased to >10 d. The CRE demonstrated heterotrophy (net ecosystem metabolism or NEM < 0.0) across all wet and dry season budgets. While the SLE was sensitive to DIN loading, system autotrophy (NEM > 0.0) increased significantly with external DIP loading. This included DIP consumption and a bloom of a cyanobacterium (Microcystis aeruginosa) following hurricane-induced discharge to the SLE in 2005. Additionally, while denitrification provided a microbially-mediated N loss pathway for the CRE, this potential was not evident for the SLE where N2 fixation was favored. Disparities between total and inorganic loading ratios suggested that the role of dissolved organic nitrogen (DON) should be assessed for both estuaries. Nutrient budgets indicated that net internal production or consumption of DIN and DIP fluctuated with inter- and intra-annual variations in freshwater inflow, hydrodynamic flushing, and primary production. The results of this study should be included in watershed management plans in order to maintain favorable conditions of external loading relative to internal material cycling in both dry and wet seasons.

Tissue nutrient content of Gracilaria spp. (Rhodophyta) and water quality along an estuarine gradient

1995 ◽  
Vol 46 (6) ◽  
pp. 975 ◽  
Author(s):  
JL Horrocks ◽  
GR Stewart ◽  
WC Dennison
Keyword(s):  
Water Quality ◽  
Water Column ◽  
Plant Tissue ◽  
Time Course ◽  
Inorganic Nitrogen ◽  
River Mouth ◽  
Nutrient Content ◽  
Moreton Bay ◽  
Tissue Nutrient Content ◽  
Tissue Nitrogen

Tissue nutrient content of Gracilaria spp. (Rhodophyta) was tested as a bioindicator of water column nutrient availability in the Logan River and southern Moreton Bay, south-eastem Queensland. Macroalgae were incubated for one to two weeks within flow-through incubation chambers suspended in the water column. Tissue nutrient content of Gracilaria spp, and water column nutrients were measured at five sites over a five-month period. Tissue nitrogen content (%N) was correlated with dissolved inorganic nitrogen (DIN) at a site 15 km upstream from the Logan River mouth (r² = 0.81), at the Logan River mouth (r² = 0.50), and at a Moreton Bay site 8 km from the Logan River mouth (r² = 0.71). Time-course analyses of water column nutrients and plant tissue content showed more significant correlations with nitrogen (N) than with phosphorus (P). Plant tissue nitrogen-to-phosphorus (N:P) molar ratios ranged between 19 and 23 whereas water column N:P ratios were between 2 and 6, suggesting low nitrogen availability relative to plant requirements and possible N limitation. In the laboratory, Gracilaria verrucosa was subjected to treatments of N, P or N + P nutrient additions. Deepening of the thallus colouration was observed after additions of N. Chlorophyll and phycoerythrin concentrations increased in treatments with N addition; however, owing to wide variability between phycoerythrin replicates, only chlorophyll increases were significant. The amino acid citrulline also increased with the addition of N and accounted for up to 16% of the total tissue N. Macroalgae may be more useful than traditional water quality sampling for integrating biologically available pulses of nutrients, especially for a limiting nutrient such as N in coastal marine ecosystems.

Water Exchange Between Lake Ontario and Hamilton Harbour: Water Quality Implications

1988 ◽  
Vol 23 (2) ◽  
pp. 213-226 ◽  
Author(s):  
J. Barica ◽  
M.N. Charlton ◽  
D.J. Poulton ◽  
R. Kohli
Keyword(s):  
Water Quality ◽  
Beneficial Effect ◽  
Residence Time ◽  
Water Exchange ◽  
Industrial Effluents ◽  
Lake Ontario ◽  
Hydraulic Residence Time ◽  
Hamilton Harbour ◽  
Western Lake ◽  
Harbour Water

Abstract Hamilton Harbour is an enclosed body of water situated at the western end of Lake Ontario and containing about 2.8 x 108 m3 of water, polluted by municipal and industrial effluents. It is connected to Lake Ontario by a ship canal, which facilitates a substantial exchange of water between the two water bodies. Exchange of harbour and lake water through the canal reduces the theoretical hydraulic residence time of the harbour and contributes to improvement of the harbour water quality through dilution and oxygenation. Without it, the Hamilton Harbour water quality situation would be more critical. The beneficial effect of dilution by Lake Ontario far exceeds contamination of western Lake Ontario by Hamilton Harbour water.

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