A Simple Index of Trophic Status in Estuaries and Coastal Bays Based on Measurements of pH and Dissolved Oxygen

O’Boyle, Shane; McDermott, Georgina; Noklegaard, Tone; Wilkes, Robert

doi:10.1007/s12237-012-9553-4

Cited by 49 publications

(27 citation statements)

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“…The same limitation was observed for the integrated model for the Assessment of Estuarine Trophic Status (ASSETS) developed by Bricker et al (2003). A recent and simplified index of the status of eutrophication was developed by using pH-and dissolved oxygen saturation for estuaries and coastal bays (O'Boyle et al, 2013). Some comparison between the TRIX and the ASSETS indicated that TRIX can be used as an indicator of trophic state whereas ASSETS showed good potential to assess eutrophication in coastal areas (Lai et al, 2014).…”

Section: Abstract: Aimmentioning

confidence: 77%

Section: Abstract: Aimmentioning

confidence: 99%

“…This aspect supports the relevance of the use of quantitative numerical indices for the determination of the trophic water quality, involving the integration of several parameters, which provide better spatial and temporal coverage. Generation of water classification using numerical trophic indices provides subsidies for the formulation of public management programs that aim at the preservation and good management of water resources (Baumgarten & Paixão, 2013;O'Boyle et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…However, some similarities between both, the index and the model, were evident in an estuarine area located on the southern coast in Pernambuco, Brazil (Alves et al, 2013). TRIX was also more efficient to indicate the trophic state of Guanabara Bay, Rio de Janeiro, Brazil (Santos, 2015), in comparison with the TSI developed by O'Boyle et al (2013), since this bay has a high seawater exchange.Considering the limitation of a more recent index for brackish water lagoons, the adaptation of TSI seems to be more suitable to be applied to these areas. A different approach of the TSI calculation to be applied to continental and estuarine waters in Brazil was observed by some previous studies.…”

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confidence: 99%

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Trophic quality of waters in the Patos Lagoon estuary: a comparison between its margins and the port channel located in Rio Grande, RS, Brazil

2017

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Qualidade trófica das águas no estuário da Lagoa dos Patos (RS, Brasil): comparação entre suas margens e o canal do porto localizado em Rio Grande, RS, Brasil Abstract: Aim:This study aimed to evaluate the Trophic State Index (TSI) at the margin and in the channel of the Patos Lagoon estuary, considering different hydrological conditions. Methods: Surface and bottom water samples were collected in three sites in the channel (margin and center) and in two sites at the Saco da Mangueira in different hydrological conditions in 2011. Results: Waters at the Saco da Mangueira are very contaminated by phosphate and nitrogenous compounds. The TSI classifies these waters as being hypereutrophic, the consequence of both the release of effluents which were poorly treated and the low water flow in the inlet. Contamination was mild at the margins of the channel, where waters were classified as being eutrophic and mesotrophic. Trophic balance (mesotrophic waters -oligotrophic surface -bottom) was found in the center of the channel as a consequence of strong water flow and dilution of contaminants coming from the margins. Conclusions: Spatial variation in the TSI value enabled clear distinction to be observed between the areas at the margins and in the channel, because it reflected the punctual presence of anthropogenic input in the marginal waters, mainly in the Saco da Mangueira. Effluent treatment must be required in order to control severe trophic imbalance in the waters at the margins of the city. Variations of the proposed index are a useful tool to identify sources of phosphate compounds in other aquatic environments.Keywords: effluents; organic contamination; phytonutrients; Trophic State Index.Resumo: Objetivo: O objetivo deste estudo foi avaliar o Índice de Estado Trófico (IET) das margens e do canal da Lagoa dos Patos, considerando diferentes condições hidrológicas. Métodos: amostras de águas da superfície e do fundo foram coletadas em 2011 em três locais no canal (margem e centro) e em dois locais do Saco da Mangueira em diferentes condições hidrológicas. Resultados: As águas do Saco da Mangueira são muito contaminadas por fosfato e compostos nitrogenados. O TSI classifica estas águas como sendo hipertróficas, como consequência de ambos, a liberação de efluentes que são pouco tratados e baixo fluxo de água na enseada. No eixo deste canal houve equilíbrio trófico (águas mesotróficas -superfície e oligotróficas -fundo), consequência da intensa circulação da água e diluição dos contaminantes oriundos das margens. Conclusões: A variação espacial nos valores do TSI indicou uma distinção clara entre as áreas nas margens e no canal, visto que refletem a presença pontual de aportes antropogênicos nas águas de margem, principalmente do Saco da Mangueira. for lagoons has also been modified with the use of nitrite-nitrogen, chlorophyll-a, and Secchi disk depth for the estimation of the status of eutrophication (Gupta, 2014). Other approaches used the trophic index TRIX, based on Chl-a, oxygen saturation, total nitrogen, and ...

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Section: Abstract: Aimmentioning

confidence: 77%

Section: Abstract: Aimmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Trophic quality of waters in the Patos Lagoon estuary: a comparison between its margins and the port channel located in Rio Grande, RS, Brazil

2017

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“…It is possible that in an environment with low levels of organic matter and low levels of respiration, any hydrogen ions released are being absorbed by the alkalinity of the surrounding seawater [10]. COD is lower than the threshold limit of the first class water quality standard and is insignificantly related with other water quality parameters, implying the low organic matter in this environment.…”

Section: Resultsmentioning

confidence: 99%

Identification of Seawater Quality by Multivariate Statistical Analysis in Xisha Islands, South China Sea

Wu¹,

Dong²,

Wang³

2017

Water Quality

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Xisha waters are considered to be in pristine condition, while facing the fast increasing stress under anthropogenic activities. Water quality around Yongxing Island (YX) has been measured in May, 2012. The results show that the water quality is of the first class standards as compared to the water quality of China, with insignificant difference among the monitoring stations. Robust principal component analysis (PCA) was used to identify the spatial pattern of water quality. YX is characterized by high DO, salinity, and Chl-a with low nutrients, indicating phytoplankton photosynthesis is stronger in YX island waters than the rest of the study areas. Beidao (BD) is characterized by high NH 4 -N and COD, and low pH, implying that these areas may have higher organic matter decomposition than rest of the areas. The water quality monitoring stations should cover spatially and temporally around Xisha waters for protecting the marine environment.

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Water Quality Assessment of Aswan High Dam Reservoir

Elshemy

Meon

2016

The Handbook of Environmental Chemistry

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A Simple Index of Trophic Status in Estuaries and Coastal Bays Based on Measurements of pH and Dissolved Oxygen

Cited by 49 publications

References 25 publications

Trophic quality of waters in the Patos Lagoon estuary: a comparison between its margins and the port channel located in Rio Grande, RS, Brazil

Trophic quality of waters in the Patos Lagoon estuary: a comparison between its margins and the port channel located in Rio Grande, RS, Brazil

Identification of Seawater Quality by Multivariate Statistical Analysis in Xisha Islands, South China Sea

Water Quality Assessment of Aswan High Dam Reservoir

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