Dissolved nutrient fluxes in macrotidal estuary in the Amazonian region, Brazil

Santos, Thays Thayanne Luz; Serejo, Jefferson Horley Feitosa; Lima, Hugo Pereira; Eschrique, Samara Aranha

doi:10.5914/tropocean.v48i1.247360

Cited by 1 publication

(2 citation statements)

References 25 publications

(42 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Corrêa et al (2019) recorded pH higher than 8.0 for the coast of the state of Maranhão, attributing these values to the direct influence of macro-tides in the region. The pH in the ERA can also be altered by factors such as photosynthesis and decomposition of organic matter (Santos et al, 2020).…”

Section: Physical and Chemical Characterizationmentioning

confidence: 99%

“…Lower concentrations of TSS were found in the dry period, when the freshwater input is diminished and the estuary is influenced more by marine waters, which have lower concentrations of suspended particulate matter. In studies on a macrotidal estuary in the state of Maranhão, Santos et al (2020) report that the tide plays an important role in the dynamics of the sediments and concentrations of TSS at the surface. The movements of the tide re-suspend fine sediments, increasing concentrations of TSS in the water column as well as controlling the distribution and reworking of bottom sediments.…”

Section: Physical and Chemical Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Distribution of physical and chemical variables in the water column and characterization of the bottom sediment in a macrotidal estuary on the Amazon coast of the state of Maranhão, Brazil

Machado¹,

Eschrique²,

Lima³

et al. 2022

Rev. ambiente água

Self Cite

View full text Add to dashboard Cite

The objective of this research was to characterize the distribution of dissolved nutrients at six sampling stations in the estuary of the Anil River (ARE) and characterize the bottom sediment. The study area is influenced by a tropical climate and semidiurnal macrotidal regime. Sampling of the surface water and sediment was performed in the main channel at six sampling stations distributed along the estuary in the rainy period (May 9th) and dry period (October 5th) during the spring. Physical variables were collected with the aid of a HANNA HI-8424 multi-parameter probe (water temperature, salinity, pH, dissolved oxygen, and turbidity) and YSI CTD (conductivity, temperature, and depth) probe. A van Veen dredge was used for the collection of bottom sediment from the main channel. The sedimentological results were heterogeneous. Grain size ranged from very fine to medium sand. Dissolved nutrients in the ARE had different sources depending on the season. Continental and fluvial inputs, evidenced by salinity values, governed the distribution of nutrients in the rainy period (January to June), whereas nutrient concentrations were related to the recycling of organic material in the estuary in the dry season (July to December). The considerable presence of sand in the main channel indicates that the sediments available in ARE are exposed to intense hydrodynamics. The distribution of nutrients and the grain size revealed the occurrence of different sources in the estuary according to the rainfall regime and the intense hydrodynamics of tidal currents (semidiurnal macrotidal). Keywords: dissolved nutrients, estuarine environment, sedimentology.

show abstract

Section: Physical and Chemical Characterizationmentioning

confidence: 99%

Section: Physical and Chemical Characterizationmentioning

confidence: 99%