Tolerance of developing salmonid eggs and fry to nitrate exposure

Kincheloe, John W.; Wedemeyer, Gary; Koch, David L.

doi:10.1007/bf01770006

Cited by 63 publications

(33 citation statements)

References 1 publication

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“…Furthermore, the concentration of nitrate-N in our study was generally low, even below the guidelines for surface waters from the Ministerio del Ambiente del Ecuador (MAE, 13 mg/L) and the European Commission (EC, 50 mg/L) [69,70]. Our observed maximum concentration of nitrate-N also equaled the appropriate maximum level to protect the most sensitive freshwater species (2 mg/L) [71,72]. A previous study by Borbor-Cordova et al [73] suggested that some parts of the Guayas River basin have experienced nutrient loss and soil degradation due to their intensive farming activities, in which the amount of nutrients that leave the soil through exported crops is higher than the original soil content plus the applied chemical fertilizers [73].…”

Section: Biotic Integrity and Potential Restoration Actionssupporting

confidence: 44%

Generalized Linear Models to Identify Key Hydromorphological and Chemical Variables Determining the Occurrence of Macroinvertebrates in the Guayas River Basin (Ecuador)

Damanik-Ambarita

Everaert

Forio

et al. 2016

Water

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Abstract:The biotic integrity of the Guayas River basin in Ecuador is at environmental risk due to extensive anthropogenic activities. We investigated the potential impacts of hydromorphological and chemical variables on biotic integrity using macroinvertebrate-based bioassessments. The bioassessment methods utilized included the Biological Monitoring Working Party adapted for Colombia (BMWP-Col) and the average score per taxon (ASPT), via an extensive sampling campaign that was completed throughout the river basin at 120 sampling sites. The BMWP-Col classification ranged from very bad to good, and from probable severe pollution to clean water based on the ASPT scores. Generalized linear models (GLMs) and sensitivity analysis were used to relate the bioassessment index to hydromorphological and chemical variables. It was found that elevation, nitrate-N, sediment angularity, logs, presence of macrophytes, flow velocity, turbidity, bank shape, land use and chlorophyll were the key environmental variables affecting the BMWP-Col. From the analyses, it was observed that the rivers at the upstream higher elevations of the river basin were in better condition compared to lowland systems and that a higher flow velocity was linked to a better BMWP-Col score. The nitrate concentrations were very low in the entire river basin and did not relate to a negative impact on the macroinvertebrate communities. Although the results of the models provided insights into the ecosystem, cross fold model development and validation also showed that there was a level of uncertainty in the outcomes. However, the results of the models and sensitivity analysis can support water management actions to determine and focus on alterable variables, such as the land use at different elevations, monitoring of nitrate and chlorophyll concentrations, macrophyte presence, sediment transport and bank stability.

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Section: Biotic Integrity and Potential Restoration Actionssupporting

confidence: 44%

Generalized Linear Models to Identify Key Hydromorphological and Chemical Variables Determining the Occurrence of Macroinvertebrates in the Guayas River Basin (Ecuador)

Damanik-Ambarita

Everaert

Forio

et al. 2016

Water

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“…Field and laboratory evidence suggests that acute and chronic toxic impacts are possible as a consequence of N-induced changes in surface water chemistry (Kincheloe et al 1979, Zischke et al 1983, Magnuson et al 1984, Lemly and Smith 1987, Ingersoll et al 1990a. Episodic acidification was studied in 13 small streams in the Adirondack region of New York, in the Catskills of New York, and in the northern Appalachian Plateau, Pennsylvania .…”

Section: Toxicity Of Surface Watersmentioning

confidence: 99%

Nitrogen Excess in North American Ecosystems: Predisposing Factors, Ecosystem Responses, and Management Strategies

Fenn¹,

Poth²,

Aber³

et al. 1998

Ecological Applications

328

492

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Abstract. Most forests in North America remain nitrogen limited, although recent studies have identified forested areas that exhibit symptoms of N excess, analogous to overfertilization of arable land. Nitrogen excess in watersheds is detrimental because of disruptions in plant/soil nutrient relations, increased soil acidification and aluminum mobility, increased emissions of nitrogenous greenhouse gases from soil, reduced methane consumption in soil, decreased water quality, toxic effects on freshwater biota, and eutrophication of coastal marine waters. Elevated nitrate ( ) loss to groundwater Ϫ

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“…Reduced nitrogen is formed, as ammonia is oxidized in fresh-water systems causing oxygen depletion (Sharma and Ahlert 1977). Kincheloe et al (1979) and Camargo et al (2005) have stated the maximum permissible limit of nitrite nitrogen as 2.0 mg/l for protecting most sensitive freshwater species. Recognizing that the toxic effects of nitrite or nitrate on warm or cold water fishes could rarely occur in nature, no restrictive criteria are recommended by US EPA.…”

mentioning

confidence: 99%

Spatial–temporal variation and comparative assessment of water qualities of urban river system: a case study of the river Bagmati (Nepal)

Kannel

Lee

Kanel

et al. 2007

Environ Monit Assess

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The study presents the assessment of variation of water qualities, classification of monitoring networks and detection of pollution sources along the Bagmati River and its tributaries in the Kathmandu valley of Nepal. Seventeen stations, monitored for 23 physical and chemical parameters in pre-monsoon, monsoon, post-monsoon and winter seasons, during the period 1999-2003, were selected for the purpose of this study. The study revealed that the upstream river water qualities in the rural areas were increasingly affected from human sewage and chemical fertilizers. In downstream urban areas, the river was heavily polluted with untreated municipal sewage. The contribution of industries to pollute the river was minimal. The higher ratio of COD to BOD (3.74 in the rural and 2.06 in the urban) confirmed the increased industrial activities in the rural areas. An increasing trend of nitrate was found in the rural areas. In the urban areas, increasing trend of phosphorus was detected. The water quality measurement in the study period showed that DO was below 4 mg/l and BOD, COD, TIN, TP and TSS above 39.1, 59.2, 10.1, 0.84 and 199 mg/l, respectively, in the urban areas. In the rural areas, DO was above 6.2 mg/l and BOD, COD, TIN, TP and TSS below 15.9, 31, 5.24, 0.41 and 134.5 mg/l, respectively. The analysis for data from 1988 to 2003 at a key station in the river revealed that BOD was increasing at a rate of 1.8 mg/l in the Bagmati River. A comparative study for the water quality variables in the urban areas showed that the main river and its tributaries were equally polluted. The other comparison showed the urban water qualities were significantly poor as compared with rural. The cluster analysis detected three distinct monitoring groups: (1) low water pollution region, (2) medium water pollution region, (3) heavy water pollution region. For rapid assessment of water qualities using the representative sites could serve to optimize cost and time without loosing any significance of the outcome. The factor analysis revealed distinct groups of sources and pollutions (organics, nutrients, solutes and physicochemical).

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Tolerance of developing salmonid eggs and fry to nitrate exposure

Cited by 63 publications

References 1 publication

Generalized Linear Models to Identify Key Hydromorphological and Chemical Variables Determining the Occurrence of Macroinvertebrates in the Guayas River Basin (Ecuador)

Generalized Linear Models to Identify Key Hydromorphological and Chemical Variables Determining the Occurrence of Macroinvertebrates in the Guayas River Basin (Ecuador)

Nitrogen Excess in North American Ecosystems: Predisposing Factors, Ecosystem Responses, and Management Strategies

Spatial–temporal variation and comparative assessment of water qualities of urban river system: a case study of the river Bagmati (Nepal)

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