Natural and human controls of water quality of an Amazon estuary (Caeté-PA, Brazil)

Monteiro, Marcela Cunha; Jiménez, José A.; Pereira, Luci Cajueiro Carneiro

doi:10.1016/j.ocecoaman.2016.01.014

Cited by 37 publications

(23 citation statements)

References 44 publications

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“…Comparing our results with those of other studies of mangrove regions, it is possible to confirm that this minor estuary sustains similar chlorophyll-a concentrations to those found in much larger Amazonian estuaries (even richer in nitrogenous compounds, for example, with average total dissolved nitrogen around 30% (approximately 30 µmol L -1 ) higher than the levels recorded in the Taperaçu estuary (Monteiro et al 2016;Sousa et al 2016). It thus seems reasonable to assume that the Caeté Estuary can be an important source of nutrients for the Taperaçu Estuary.…”

Section: Discussionsupporting

confidence: 88%

Influence of a Drought Event on Hydrological Characteristics of a Small Estuary on the Amazon Mangrove Coast

Pereira

Costa

et al. 2017

Estuaries and Coasts

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The effects of atypical climatic conditions, such as those of a drought event, are remarkably accentuated in minor estuaries filled with sediments and with reduced or sporadic freshwater input, where the salinity intrusion is pronounced. To understand these effects, hydrological and hydrodynamic parameters were evaluated during a drought period in a small estuary located on the eastern Amazon coast in northern Brazil. Five campaigns were conducted between June 2012 and June 2013. Samples were collected from the surface and bottom layer every three hours over a 25-hour period at three stations of the Taperaçu Estuary. To compare drought and post-drought periods, in terms of salinity and chlorophyll-a, data was recorded until June 2015. Taperaçu is a relatively shallow estuary of the Amazon coastal zone, which is characterized by the absence of any direct fluvial discharge, although it does receive freshwater input from adjacent wetlands, as well as less saline waters from the Caeté Estuary through the Taici Creek. Hydrological variables were controlled by rainfall levels and the tidal range, and the water became more saline and more oxygenated, with reduced dissolved nutrient and chlorophyll-a concentrations when precipitation decreased. Significant variation was found between the months of June 2012 (most intense drought) and 2013 (less intense drought). The connection to the neighboring Caeté Estuary, and adjacent mangroves and wetlands contributed to the influx of nutrient-enriched waters. Overall, then, it is hoped that the results of this study can contribute to the understanding of the effects of drought events in other minor estuaries on the highly indented Amazon coast, as well as in other areas of the equatorial zone with similar environmental characteristics.

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Section: Discussionsupporting

confidence: 88%

Influence of a Drought Event on Hydrological Characteristics of a Small Estuary on the Amazon Mangrove Coast

Pereira

Costa

et al. 2017

Estuaries and Coasts

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“…However, it was atypical, according to the historical series (AZEVEDO et al, 2008). That is a typical scenario for the Amazon regimes (MONTEIRO et al, 2016). The following diagram shows the interrelationships among those variables involved and the phytoplankton community, in which the rain was the enhancing agent of nutrient concentrations and the increase in local blooms.…”

Section: Discussionmentioning

confidence: 99%

Spatial and seasonal variation of microphytoplankton community and the correlation with environmental parameters in a hypereutrophic tropical estuary - Maranhão - Brazil

et al. 2017

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Duarte-dos-Santos et al.: Spatial-seasonal variation of microphytoplankton 356 Spatial and seasonal variation of microphytoplankton community and the correlation with environmental parameters in a hypereutrophic tropical estuary -Maranhão -BrazilThe Bacanga River Estuary has a hydrodynamic behavior and its tidal flow is limited by a dam. It is considered as a hypertrophic environment that receives daily high loads of domestic sewage without treatment. This study aimed to evaluate the spatial and temporal variation of phytoplankton community and its relationship with environmental parameters. Bi-monthly sampling campaigns were carried out at six fixed sites between 2012 and 2013. Physical-chemical and biological parameters were collected (chlorophyll a, phytoplankton composition and abundance) to perform the statistical correlations. The results indicate that phytoplankton community is mostly represented by diatoms, with Skeletonema costatum being the dominant species responsible for bloom in April and June of 2012. The dominance of this species is related to the high silicate concentrations, pH and turbidity. Other blooms events as well as the Euglena gracilis and Chlamydomonas sp. were recorded in February 2013, when the total phosphorus concentrations were high and the dissolved oxygen concentrations were higher. Dinoflagellates, cyanobacteria and diatom Thallassiosira sp. were widely distributed in the dry period and highly correlated with salinity, water transparency and nutrients. Hence, the distribution of phytoplankton community is more defined seasonally, rather than spatially. AbstrActDescriptors: Algal bloom, Microalgae, Nutrients.O estuário do rio Bacanga apresenta um comportamento hidrodinâmico com fluxo de marés limitado por uma barragem. Ele é considerado como um ambiente hipereutrófico que recebe diariamente altas cargas de esgoto doméstico sem tratamento. Este trabalho teve como objetivo avaliar a variação espaço-sazonal da comunidade fitoplanctônica e suas relações com parâmetros ambientais. Amostragens bimestrais foram realizadas em seis pontos fixos entre 2012 e 2013, obtendo valores dos parâmetros físico-químicos e biológicos (clorofila a, composição e abundância do fitoplâncton) para realização das análises estatísticas. Os resultados indicam que a comunidade fitoplanctônica é representada por diatomáceas, sendo Skeletonema costatum a espécie dominante responsável por pulsos de florações em abril e junho de 2012. O predomínio dessa espécie está relacionado aos elevados teores de silicato, pH e turbidez da água. Outros eventos de florações como da Euglena gracilis e Chlamydomonas sp. foram registrados em fevereiro de 2013, quando os teores de fósforo total estiveram elevados e as taxas de oxigênio dissolvido foram superiores. Os dinoflagelados, cianobactérias e a diatomácea Thallassiosira sp. apresentaram ampla distribuição no período de estiagem e estão altamente correlacionados com a salinidade, transparência da água e nutrientes. Desta forma, a distribuição da comunidade fitoplanctônica é ...

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“…Volume and duration of seasonal rainfall increase from east to west along the Pará coast (Moraes et al 2005) with associated variation in salinity (Asp et al 2013). At the oyster culture units, seasonal variation in salinity ranged widely (0.1 to 49.2), due to greater freshwater runoff between February and April (Asp et al 2013;Monteiro et al 2016) at AGRONAM and AQUAVILA, and high rates of estuarine evaporation in the dry season (Berrêdo et al 2008) at AAPPNS, ASAPAQ and AGROMAR. Crassostrea gasar tolerates wide variation in salinity (2-50), but optimal survival is between 4 and 40 (Horodesky et al 2019).…”

Section: Salinitymentioning

confidence: 99%

“…Natural processes such as secondary production of biomass, restricted water exchange, and weather conditions may diminish oxygen produced by photosynthesis and diffusion (Breitburg et al 2015). Sewage outflow from Amazon coastal settlements (Sousa-Felix et al 2017), and wet season detritus input and runoff, result in greater estuarine biological oxygen demand as well as a potentially significant public health risk from contamination by microorganisms (Mignani et al 2013;Monteiro et al 2016;Sousa-Felix et al 2017). For example, coliform bacteria increased in waters around mangrove oyster culture units in Iguape, Bahia state, in the rainy season and during spring tides (Freitas et al 2017).…”

Section: Dissolved Oxygenmentioning

confidence: 99%

Variation in environmental characteristics of waters among Amazon coast oyster culture units

et al. 2020

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Oyster culture has benefited traditional coastal communities along the Amazon macrotidal mangrove coast of Pará state in Brazil since 2006. Currently, seven oyster culture units in five municipalities are expanding production, but with no environmental monitoring, which is important for the control of the impacts of oyster culture on waters as well as for oyster management and conservation. Seasonal variation in environmental characteristics of the water was evaluated at all oyster culture units in Pará, from September to November 2013 (dry season) and February to April 2014 (wet season), to generate baseline data to evaluate future impacts and aid strategic planning, such as diversifying seed production. Salinity, dissolved oxygen, pH, oxidation-reduction potential, depth, temperature, and chlorophyll-a concentration were measured during flooding and ebbing tides, and compared between seasons and among culture units using uni- and multivariate statistics. All variables were significantly higher in the dry season, except depth, which was significantly greater in the wet season. Mean salinity, which varied from 2.4 to 46, explained most of the variation among culture units in relation to season, sampling date within each season and tidal state. However, dissolved oxygen, pH and depth were also important. Oyster culture units in Pará may be suitable for sustainable harvesting of seed/spat from the wild (lower salinity and pH), or for on-growing (higher salinity, higher pH, and greater depth). Seasonal variation is sufficient to allow both activities at most units at appropriate times of the year, which would help increase oyster production in Pará.

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Natural and human controls of water quality of an Amazon estuary (Caeté-PA, Brazil)

Cited by 37 publications

References 44 publications

Influence of a Drought Event on Hydrological Characteristics of a Small Estuary on the Amazon Mangrove Coast

Influence of a Drought Event on Hydrological Characteristics of a Small Estuary on the Amazon Mangrove Coast

Spatial and seasonal variation of microphytoplankton community and the correlation with environmental parameters in a hypereutrophic tropical estuary - Maranhão - Brazil

Variation in environmental characteristics of waters among Amazon coast oyster culture units

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