Eutrophication and water quality in a tropical Brazilian estuary

Alves, Gilson; Flores‐Montes, Manuel; Gaspar, Felipe; Gomes, J. L.; Feitosa, Fernando Antônio do Nascimento

doi:10.2112/si65-002.1

Cited by 29 publications

(16 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Among them, one finds an increase in salinity, a dilution of nutrient salts and, consequently, a decrease in chlorophyll-a concentrations and primary productivity. Studies conducted in the past have reported that changes in the coastal dynamics in the Suape port area affected nutrient and algal biomass contents [15], as well as the species composition of phytoplankton [35] and zooplankton populations [36]. Water transparency in estuarine ecosystems may vary depending on rainfall intensity and duration.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Phytoplankton Productivity and Hydrology in an Impacted Estuarine Complex in Northeastern Brazil

Silva¹,

Feitosa²,

Montes³

et al. 2019

OJE

View full text Add to dashboard Cite

The aim of the current study was to evaluate the productive capacity of the phytoplankton community and other environmental variables in the estuarine area of Suape; while considering the constant morphological, sedimentological and hydrological changes, the site has been facing due to the implementation and expansion of an industrial and port complex. The study comprised 6 campaigns: 3 in the dry season and 3 in the rainy season. Water samples were collected from the surface layer of the internal and external portions of the estuarine bay during low spring tides. The salinity ranged from 32.20 to 37.10, the water temperature ranged from 26.60˚C to 29.40˚C, and the oxygen saturation rate ranged from 58.5% to 114.5%. There was significant seasonal variation. The nitrite concentration was higher during the rainy season, whereas the ammonia concentration was higher during the dry season; the higher ammonia concentration helped increase chlorophyll-a levels and rates of primary productivity, which ranged from 0.02-2.45 mg•m −3 and from 0.34 to 4.32 mg•C•m −3 •h −1 , respectively. Chlorophyll-a < 20 μm was the fraction of biomass most commonly present in the estuarine ecosystem, accounting for 88.6% of the chlorophyll-a-containing biomass, and this reflected the low nutrient content in the water and indicated that the area was free from eutrophication processes. The decrease of rainfall during the sampling months and the anthropogenic changes in the environment led to reduced continental contributions, increased marine interference, nutrient dilution and loss of phytoplankton production capacity in Suape Bay, which severely damaged other trophic links in the ecosystem.

show abstract

Section: Discussionmentioning

confidence: 99%

“…In recent years, the estuary has faced a continuous degradation process due to the construction and expansion of an industrial and port complex. Several studies have focused on evaluating the quality of the water ( [14] [15] [16] [17]) and investigating the local biodiversity ([18] [19] [20] [21]).…”

Section: Introductionmentioning

confidence: 99%

Phytoplankton Productivity and Hydrology in an Impacted Estuarine Complex in Northeastern Brazil

Silva¹,

Feitosa²,

Montes³

et al. 2019

OJE

View full text Add to dashboard Cite

show abstract

“…In Kuttanad agrarian zone the annual consumption of fertilizer was 8409 tonnes of N, 5044 tonnes of P and 6786 tonnes of K and the pesticides/fungicides/weedicides were about 500 tonnes/annum [61]. Dissolved inorganic phosphorus was the nutrient most associated with eutrophication in aquatic system [83]. The low N:P ratio from the study specifies the surplus loading of phosphorus into the estuary.…”

Section: Discussionmentioning

confidence: 99%

Ecosystem analysis of the degrading Vembanad wetland ecosystem, the largest Ramsar site on the South West Coast of India — Measures for its sustainable management

Asha

Retina

Suson

et al. 2016

Regional Studies in Marine Science

View full text Add to dashboard Cite

“…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). 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.…”

Section: Abstract: Aimmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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 ...

show abstract

Eutrophication and water quality in a tropical Brazilian estuary

Cited by 29 publications

References 16 publications

Phytoplankton Productivity and Hydrology in an Impacted Estuarine Complex in Northeastern Brazil

Phytoplankton Productivity and Hydrology in an Impacted Estuarine Complex in Northeastern Brazil

Ecosystem analysis of the degrading Vembanad wetland ecosystem, the largest Ramsar site on the South West Coast of India — Measures for its sustainable management

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

Contact Info

Product

Resources

About