Nutrient fluctuations in the Quatipuru river: A macrotidal estuarine mangrove system in the Brazilian Amazonian basin

Pamplona, Fábio Campos; Páes, Eduardo Tavares; Nepomuceno, Aguinaldo

doi:10.1016/j.ecss.2013.09.010

Cited by 43 publications

(40 citation statements)

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“…Based on that, the seasonal rainfall in tropical areas produce fluctuations in salinity, nutrient concentrations, turbidity and biological productivity (SANTIAGO et al, 2010) and the ammonium was the main inorganic form of DIN in the Bacanga River Estuary, corroborating with the data of MOSER et al (2005); PAMPLONA et al (2013) and SILVA et al (2015).…”

Section: Discussionsupporting

confidence: 74%

“…The rain influences directly the salinity, which showed values significantly lower during the months of April and June, and it causes an increased salinity gradient toward the downstream, similar to that registered by PAMPLONA et al (2013) in the Amazon estuary. The blooms of Skeletonema costatum, Euglena gracilis and Chlamydomonas sp occur when there is an intensification of the rainfall (LEÃO et al, 2008;BAZIN et al, 2014;JENDYK et al, 2014).…”

Section: Discussionmentioning

confidence: 90%

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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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Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 90%

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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“…In the present study, current speeds recorded in the Caet e Estuary during the dry seasons were much higher during the ebb tide compared with the flood tide, whereas during the rainy season, the opposite trend was observed, due to the increased fluvial discharge. Similar seasonal patterns have been observed in other estuaries of the Amazon Coast (Asp et al 2012;Pamplona et al 2013), although the effects of this variation on the zooplankton community remain unclear.…”

Section: River Discharge Hydrodynamics Hydrological Patterns and Cosupporting

confidence: 73%

“…; Pamplona et al . ), although the effects of this variation on the zooplankton community remain unclear.…”

Section: Discussionmentioning

confidence: 99%

“…The 2500 km of the Amazon Coast form a complex system of estuaries in a highly dynamic environment characterized by a unique set of hydrological and hydrodynamic attributes (e.g. nutrient-rich waters, high productivity, strong tidal currents and a macrotidal semidiurnal regimensee Goes et al 2014;Pamplona et al 2013;Pereira et al 2010;Santos et al 2008) and encompasses the world's second-largest continuous tract of mangrove forest (Souza Filho 2005). These conditions provide unusually large amounts of nutrients and organic matter, which exceed those found in most aquatic systems anywhere else in the world (Nittrouer & DeMaster 1986;Geyer et al 1996;Dittmar & Lara 2001), with a direct influence on the biological productivity of the estuarine and coastal waters of the Amazon littoral.…”

Section: Introductionmentioning

confidence: 99%

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Copepod assemblages in a highly dynamic equatorial estuary on the Brazilian Amazon Coast

et al. 2016

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This study describes the spatial and temporal dynamics of the copepod fauna in the estuary of the Caeté River, a highly dynamic environment characterized by a unique set of hydrological and hydrodynamic attributes. This ecosystem is part of the Amazon Coastal Zone (ACZ), which sustains one of the world's largest continuous tracts of mangrove forest. In the present study, a predominance of high‐energy conditions characterized by macrotides and strong tidal currents was observed throughout the year. Salinity (0.03 ± 0.05–40.00 ± 0.84) and temperatures (26.43 ± 0.10–30.08 ± 0.43 °C) were higher than during the rainy season at all sampling stations. The highest chl‐a concentration (3.92 ± 1.47–17.63 ± 2.60 mg·m−3) was recorded at the most oligohaline (innermost) station during the rainy season, while no spatial or seasonal pattern was found in dissolved nutrient concentrations, except for phosphates, which exhibited the highest concentrations during the dry season. A total of 22 copepod taxa was identified, of which the most abundant were Oithona hebes, Oithona oswaldocruzi, Acartia tonsa, Paracalanus quasimodo, Euterpina acutifrons and Pseudodiaptomus marshi. Copepodites and nauplii were also recorded. Mean total copepod abundance varied from 710.73 ± 897 individuals (ind.)·m−3 at the inner station to 236,486 ± 398,360 ind.·m−3 near the mouth of the estuary (outermost station). The results reflected rainfall‐influenced oscillations in hydrological variables, mainly salinity, which determined shifts in the distribution of copepods and their community structure within the study area. This pattern may be typical of estuaries in the ACZ with similar hydrodynamic and hydrological attributes that are not influenced by the Amazon River plume.

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Tropical Marine Ecology

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Nutrient fluctuations in the Quatipuru river: A macrotidal estuarine mangrove system in the Brazilian Amazonian basin

Cited by 43 publications

References 43 publications

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

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

Copepod assemblages in a highly dynamic equatorial estuary on the Brazilian Amazon Coast

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