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Newham M, Olley J, Orr D, Ramsay I, Burton J. Temporal and spatial water quality impacts of point-source versus catchment-derived nitrogen loads in an urbanised estuary. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 931:172548. [PMID: 38643882 DOI: 10.1016/j.scitotenv.2024.172548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 03/21/2024] [Accepted: 04/15/2024] [Indexed: 04/23/2024]
Abstract
The Brisbane River estuary is an anthropogenically-impacted waterway in southeast Queensland, Australia. The estuary is over 80 km long and flows through an urbanised region. It receives over 500 t per year of total nitrogen (N) from direct point-source discharges in addition to sporadic flood loads of N from an agriculturally impacted upper catchment. Comprehensive water quality monitoring data for the estuary have been collected from at least 2001. This monitoring data includes ambient nutrient concentrations in the estuary, nutrient concentration and volume of the catchment inflows, and nutrient concentration and volume of point source discharges. This long-term data from a range of sources was used to determine temporal and spatial variations in concentrations, forms, stores and loads of N along the estuary for the period 2001 to 2022. Results showed that, during low-flow periods, the store of N in the mid-upper estuary (33-81 km upstream) is significantly determined by point-source discharges to this reach, and therefore the store of N can be modelled. Model parameters are the daily point source loads, a point source load decay factor, and a background constant store. In the lower estuary (0-33 km upstream) N store can be accurately determined based on dilution with seawater, with point sources not having significant influence on total N in the reach. Total N from large flood events was found to largely pass through the estuary without detectable removal processes, delivering catchment derived N directly to coastal waters. This work informs potential application of nutrient offsets in the estuary, guiding where and when offset options will be effective to mitigate the water quality impacts of point-source nutrients.
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Affiliation(s)
- Michael Newham
- Department of Environment, Science and Innovation, GPO Box 2454, Brisbane, Queensland 4001, Australia.
| | - Jon Olley
- Australian Rivers Institute, Nathan Campus, Griffith University, 170 Kessels Road, Nathan, Queensland 4111, Australia
| | - David Orr
- Department of Environment, Science and Innovation, GPO Box 2454, Brisbane, Queensland 4001, Australia
| | - Ian Ramsay
- Department of Environment, Science and Innovation, GPO Box 2454, Brisbane, Queensland 4001, Australia
| | - Joanne Burton
- Department of Environment, Science and Innovation, GPO Box 2454, Brisbane, Queensland 4001, Australia; Council of Mayors South East Queensland, PO Box 12995, George Street, Brisbane, Queensland 4003, Australia
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Cravo A, Barbosa AB, Correia C, Matos A, Caetano S, Lima MJ, Jacob J. Unravelling the effects of treated wastewater discharges on the water quality in a coastal lagoon system (Ria Formosa, South Portugal): Relevance of hydrodynamic conditions. MARINE POLLUTION BULLETIN 2022; 174:113296. [PMID: 34995889 DOI: 10.1016/j.marpolbul.2021.113296] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 12/20/2021] [Accepted: 12/21/2021] [Indexed: 06/14/2023]
Abstract
This study aimed to assess the influence of treated wastewater disposal on Ria Formosa coastal lagoon (South Portugal), the largest national producer of bivalve mollusks. Water quality was evaluated at two areas under different wastewater loads and hydrodynamic conditions, using physico-chemical variables, bacterial indicators of contamination, chlorophyll-a concentration, phytoplankton abundance and composition. Samples were collected monthly, between October 2018 and September 2019. Minor influence of effluent discharge was detected at the eastern Olhão area, exposed to stronger hydrodynamics and higher wastewater load than the northwestern Faro area (ca. 2-4-fold total nitrogen and phosphorus). The lower load weakly flushed area showed a poorer water quality, up to 500 m from the discharge point, more marked during the spring-summer period. The intensity, persistence, and spatial extent of the wastewater footprint, lower for the highest-loading area, reflected the role of local hydrodynamic conditions, modulating the influence of wastewater discharge on lagoonal water quality.
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Affiliation(s)
- A Cravo
- Centro de Investigação Marinha e Ambiental (CIMA), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.
| | - A B Barbosa
- Centro de Investigação Marinha e Ambiental (CIMA), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - C Correia
- Centro de Investigação Marinha e Ambiental (CIMA), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - A Matos
- Centro de Investigação Marinha e Ambiental (CIMA), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - S Caetano
- Centro de Investigação Marinha e Ambiental (CIMA), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - M J Lima
- Centro de Investigação Marinha e Ambiental (CIMA), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - J Jacob
- Centro de Investigação Marinha e Ambiental (CIMA), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
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Ji F, Sun Y, Ma Q, Feng X, Mi D. Response of planktonic communities to environmental stress in the eutrophic waters of Xiaoping Island in China. CHEMOSPHERE 2021; 275:130107. [PMID: 33984899 DOI: 10.1016/j.chemosphere.2021.130107] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 02/22/2021] [Accepted: 02/24/2021] [Indexed: 06/12/2023]
Abstract
Phytoplankton blooms were affected by external environmental nutrient input, while the interspecific interactions in plankton (phytoplankton and mesozooplankton) under the nutrient pollution gradient remain largely unknown. Here, we systematically collected samples for 9 months (from April to December 2018) in the coastal waters of Xiaoping Island in China to analyze the planktonic community structure and identify the main driving environmental factors along the nutrient gradient from the sewage outlet to the open sea. The results indicated that there existed obvious seasonal and spatial variations in the planktonic community. Procrustes test analysis showed that temperature, transparency, dissolved oxygen, nitrate (NO3-N), phosphate (PO4-P), and silicate (SiO3-Si) significantly affected the community compositions and diversity of plankton (p < 0.05). Co-occurrence network showed that seasons and nutrients pollution had an important influence on the inter-specific interactions between phytoplankton and mesozooplankton. In different nutrient pollution gradients, diatom was the most associated with Copepods in Section 1 (9.38%), Section 2 (9.84%), and Section 3 (5.38%), respectively, and it was also associated with Planktonic larva in Section 1 (7.81%), followed by in Section 3 (4.30%) and 2 (1.64%). Dinoflagellates were associated with Chaetognatha only in Section 1 (4.69%). This study may provide new insights into the plankton dynamics and facilitate nearshore environmental management.
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Affiliation(s)
- Fengyun Ji
- Institute of Environmental Systems Biology, Environment Science and Engineering College, Dalian Maritime University, Dalian, Liaoning Province, 116026, China
| | - Yeqing Sun
- Institute of Environmental Systems Biology, Environment Science and Engineering College, Dalian Maritime University, Dalian, Liaoning Province, 116026, China.
| | - Qiao Ma
- Institute of Environmental Systems Biology, Environment Science and Engineering College, Dalian Maritime University, Dalian, Liaoning Province, 116026, China
| | - Xiangda Feng
- Institute of Environmental Systems Biology, Environment Science and Engineering College, Dalian Maritime University, Dalian, Liaoning Province, 116026, China
| | - Dong Mi
- College of Science, Dalian Maritime University, Dalian, Liaoning Province, 116026, China
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Influences of Nutrient Sources on the Alternation of Nutrient Limitations and Phytoplankton Community in Jiaozhou Bay, Southern Yellow Sea of China. SUSTAINABILITY 2020. [DOI: 10.3390/su12062224] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A marine ecosystem box model was developed to reproduce the seasonal variations nutrient concentrations and phytoplankton biomasses in Jiaozhou Bay (JZB) of China. Then, by removing each of the external sources of nutrients (river input, aquaculture, wastewater discharge, and atmospheric deposition) in the model calculation, we quantitatively estimated its influences on nutrient structure and the phytoplankton community. Removing the river input of nutrients enhanced silicate (SIL) limitation to diatoms (DIA) and decreased the ratio of DIA to flagellates (FLA); removing the aquaculture input of nutrients decreased FLA biomass because it provided less dissolved inorganic nitrogen (DIN) but more dissolved inorganic phosphate (DIP) as compared to the Redfield ratio; removing the wastewater input of nutrients changed the DIN concentration dramatically, but had a relatively weaker impact on the phytoplankton community than removing the aquaculture input; removing atmospheric deposition had a negligible influence on the model results. Based on these results, we suppose that the change in the external nutrients sources in the past several decades can explain the long-term variations in nutrient structure and phytoplankton community. Actually, the simulations for the 1960s, 1980s, and 2000s in JZB demonstrated the shift of limiting nutrients from DIP to SIL. A reasonable scenario for this is the decrease in riverine SIL and increase in DIP from aquaculture that has reduced DIA biomass, promoted the growth of FLA, and led to the miniaturization of the phytoplankton.
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Dos Santos CB, Silva MAM, de Souza MFL, da Silva DML. Nitrogen distribution in a tropical urbanized estuarine system in northeastern Brazil. ENVIRONMENTAL MONITORING AND ASSESSMENT 2018; 190:68. [PMID: 29313110 DOI: 10.1007/s10661-017-6420-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 12/19/2017] [Indexed: 06/07/2023]
Abstract
Nitrogen enters estuaries mostly through fluvial discharge and tide, although anthropogenic sources are known to influence the amount of this element in these aquatic ecosystems. Thus, the objective of this work was to verify which river (Cachoeira, Fundão, and/or Santana) exerts greater influence on the distribution of dissolved N forms (Dissolved Organic Nitrogen and Dissolved Inorganic Nitrogen = NH3/NH4+, NO2-, and NO3-) along a tropical urbanized estuarine system in northeastern Brazil. The studies estuarine system lies with in urban municipality, and the upper portion of the Cachoeira river estuary receives the treated effluent from this municipality through a sewage treatment station and untreated effluents from nearby villages. The selected sampling stations were located near the outfall of the rivers in the estuaries to the treatment plant and the villages. Of all the nitrogen forms, dissolved organic nitrogen (DON) prevailed in the estuarine system, followed by nitrate (NO3-) as the main inorganic form. The highest concentrations were recorded in the fluvial portion and upper estuary of Cachoeira river in the dry season. Based on the N concentrations found in the estuarine system, Cachoeira river has the greatest anthropogenic influence due to the amount of untreated effluents from the villages and treated effluents from the sewage treatment plant (STP) in the upper portion of the estuary.
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Affiliation(s)
| | - Maria Aparecida Macêdo Silva
- Departamento de Ciências Exatas e Tecnológicas, Universidade Estadual de Santa Cruz, Ilhéus, BA, 45662-900, Brazil
| | - Marcelo F Landim de Souza
- Departamento de Ciências Exatas e Tecnológicas, Universidade Estadual de Santa Cruz, Ilhéus, BA, 45662-900, Brazil
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Qiao Y, Feng J, Cui S, Zhu L. Long-term changes in nutrients, chlorophyll a and their relationships in a semi-enclosed eutrophic ecosystem, Bohai Bay, China. MARINE POLLUTION BULLETIN 2017; 117:222-228. [PMID: 28185653 DOI: 10.1016/j.marpolbul.2017.02.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 01/30/2017] [Accepted: 02/01/2017] [Indexed: 05/24/2023]
Abstract
As the representative semi-enclosed bay of China, Bohai Bay has experienced severe eutrophication in recent decades. Monitoring data from 1995 to 2013 were analysed by generalized additive models (GAMs) to explore the temporal variations in nutrients concentrations, nutrient ratios, chlorophyll a (Chl a) concentrations and the responses of Chl a to the changes in nutrients in the spring and summer. The results showed that dissolved inorganic nitrogen (DIN) decreased from 1995 to 2000 but increased after 2000 in both the spring and summer, and soluble reactive phosphorus (SRP) decreased while the molar nitrogen/phosphorus (N/P) ratios (DIN to SRP) increased over the last two decades. Generally, P-limited phytoplankton growth was observed in the spring and summer and DIN was identified as the main pollutant constituent in Bohai Bay. Furthermore, negative correlations were found between DIN and Chl a in summer in Bohai Bay.
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Affiliation(s)
- Yinhuan Qiao
- Key Laboratory of Pollution Process and Environmental Criteria of Ministry of Education and Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Jianfeng Feng
- Key Laboratory of Pollution Process and Environmental Criteria of Ministry of Education and Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
| | - Shangfa Cui
- Key Laboratory of Pollution Process and Environmental Criteria of Ministry of Education and Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
| | - Lin Zhu
- Key Laboratory of Pollution Process and Environmental Criteria of Ministry of Education and Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
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Larsson ME, Ajani PA, Rubio AM, Guise K, McPherson RG, Brett SJ, Davies KP, Doblin MA. Long-term perspective on the relationship between phytoplankton and nutrient concentrations in a southeastern Australian estuary. MARINE POLLUTION BULLETIN 2017; 114:227-238. [PMID: 27641109 DOI: 10.1016/j.marpolbul.2016.09.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2016] [Revised: 09/04/2016] [Accepted: 09/06/2016] [Indexed: 06/06/2023]
Abstract
Sixteen years (1997-2013) of physicochemical, nutrient and phytoplankton biomass (Chlorophyll-a (Chl-a)) data and a decade (2003-2013) of phytoplankton composition and abundance data were analyzed to assess how the algal community in a temperate southeastern Australian estuary has responded to decreased chronic point source nitrogen loading following effluent treatment upgrade works in 2003. Nitrogen concentrations were significantly lower (P<0.05) following enhanced effluent treatment and Chl-a levels decreased (P<0.05) during the warmer months. Temperature and nutrient concentrations significantly influenced temporal changes of Chl-a (explaining 55% of variability), while salinity, temperature, pH and nutrient concentrations influenced phytoplankton abundance and composition (25% explained). Harmful Algal Bloom (HAB) dynamics differed between sites likely influenced by physical attributes of the estuary. This study demonstrates that enhanced effluent treatment can significantly decrease chronic point source nitrogen loading and that Chl-a concentrations can be lowered during the warmer months when the risk of blooms and HABs is greatest.
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Affiliation(s)
- Michaela E Larsson
- Climate Change Cluster (C(3)), Faculty of Science, University of Technology Sydney, PO Box 123, Broadway, NSW 2007, Australia.
| | - Penelope A Ajani
- Climate Change Cluster (C(3)), Faculty of Science, University of Technology Sydney, PO Box 123, Broadway, NSW 2007, Australia
| | - Ana M Rubio
- Environment and Human Services, Hornsby Shire Council, 296 Peats Ferry Rd, Hornsby, NSW 2077, Australia
| | - Kristy Guise
- Environment and Human Services, Hornsby Shire Council, 296 Peats Ferry Rd, Hornsby, NSW 2077, Australia
| | - Ross G McPherson
- Environment and Human Services, Hornsby Shire Council, 296 Peats Ferry Rd, Hornsby, NSW 2077, Australia
| | - Steven J Brett
- Microalgal Services, 308 Tucker Rd, Ormond, Victoria 3204, Australia
| | - Kevin P Davies
- Climate Change Cluster (C(3)), Faculty of Science, University of Technology Sydney, PO Box 123, Broadway, NSW 2007, Australia
| | - Martina A Doblin
- Climate Change Cluster (C(3)), Faculty of Science, University of Technology Sydney, PO Box 123, Broadway, NSW 2007, Australia
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Science to Support Management of Receiving Waters in an Event-Driven Ecosystem: From Land to River to Sea. WATER 2013. [DOI: 10.3390/w5020780] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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