Trophic dynamics (Dissolved Inorganic Nitrogen-DIN and Dissolved Inorganic Phosphorus-DIP) in tropical urban estuarine systems during periods of high and low river discharge rates

Noriega, Carlos; Araújo, Moacyr; Flores‐Montes, Manuel; Araujo, Julia

doi:10.1590/0001-3765201920180244

Cited by 5 publications

(4 citation statements)

References 18 publications

(16 reference statements)

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“…Further examination of the results revealed that winter acted as a phosphate sink, while the bay served as a phosphate source during the other three seasons, with autumn exhibiting the highest phosphate output. The daily average discharge of SRP into the bay stood at 21.74 kg/d, lower than that of Shenzhen Bay and Pernambuco, Brazil [1,67]. Additionally, the annual groundwater input of SRP in the study area was 6.16 kg/d [34], surpassing the amount of SRP discharged into the bay via surface rivers in winter.…”

Section: Analysis Of the Characteristics Of Nutrient Balance In Dapen...mentioning

confidence: 74%

Dissolved Inorganic Nutrient Biogeochemistry in an Urbanized Coastal Region: A Study of Dapeng Cove, Shenzhen

Tong,

Chen,

Zhang

2023

Sustainability

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Dissolved inorganic nutrients are pivotal in maintaining the material and energy balance of marine ecosystems, impacting the survival and dynamic succession of marine organisms. To gain a deeper understanding of the source and sink characteristics of dissolved inorganic nutrients in bays affected by human activities and to elucidate the processes involving filter-feeding shellfish in relation to these nutrients, this study investigated the source and sink dynamics of dissolved inorganic nutrients in the Dapeng Cove sea area of Shenzhen. Over the past decade, a significant change in the N/P ratio within the survey area has been observed, suggesting a shift in nutrient limitation from nitrogen to phosphorus or phosphorus–silicon limitation. This induced change in the N/P ratio, along with Si/N and Si/P ratios, may facilitate the growth of cyanobacteria and, subsequently, alter the proportions of diatoms, dinoflagellates, and cyanobacteria. Seasonal fluctuations in human disturbance intensity and precipitation determine the seasonal and spatial distribution of nutrients in the bay, thereby influencing the bay ecosystem metabolism. The Land–Ocean Interactions in the Coastal Zone (LOICZ) model analysis revealed that the bay represents a major source of inorganic nitrogen and a source of phosphate in spring, summer, and autumn, while acting as a sink for phosphate in winter. Furthermore, rivers and groundwater represent the primary sources of phosphate and inorganic nitrogen in the bay. The bay exhibits an annual net ecosystem metabolic rate of 7.06 mmol C/m2/d, with denitrification dominating the nitrogen cycle at 12.65 mmol C/m2/d. Overall, the Dapeng Cove ecosystem displays net production exceeding respiration, classifying it as an autotrophic system. Additionally, the nitrogen cycle in the sea area is predominantly driven by denitrification. The analysis also revealed that the impact of oyster proliferation on the physical and chemical factors in the surveyed area is relatively weaker than that of surface runoff and groundwater inputs.

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Section: Analysis Of the Characteristics Of Nutrient Balance In Dapen...mentioning

confidence: 74%

Dissolved Inorganic Nutrient Biogeochemistry in an Urbanized Coastal Region: A Study of Dapeng Cove, Shenzhen

Tong,

Chen,

Zhang

2023

Sustainability

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“…These contaminants can directly affect the abundance and diversity of meiofauna ( Moens et al, 2014 ). Additionally, agricultural fertilizer can be observed ( Noriega et al, 2019 ) which can cause eutrophication and anoxia due to bacterial proliferation ( Carriço et al, 2013 ). Furthermore the input of tributyltin ( Maciel et al, 2018 ) can interrupt faunal reproductive processes and cause juvenile deaths ( Schratzberger et al, 2002 ).…”

Section: Discussionmentioning

confidence: 99%

Effects of PAHs on meiofauna from three estuaries with different levels of urbanization in the South Atlantic

Silva

Santos

Farias

et al. 2022

PeerJ

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Estuarine environments are suggested to be the final receivers of human pollution and are impacted by surrounding urbanization and compounds carried by the river waters that flow from the continent. Polycyclic aromatic hydrocarbons (PAHs) are among the contaminants that can reach estuaries and can directly affect marine conservation, being considered highly deleterious to organisms living in these environments. This research investigated the meiofauna of three estuaries exposed to different levels of urbanization and consequently different levels of PAH concentrations, in order to assess how these compounds and environmental factors affect the distribution, structure and diversity of these interstitial invertebrates. A total of 15 major meiofauna groups were identified, with Nematoda being the dominant taxon (74.64%), followed by Copepoda (9.55%) and Polychaeta (8.56%). It was possible to observe significant differences in all diversity indices studied in the estuaries. With the exception of average density, the diversity indices (richness, Shannon index and evenness) were higher in the reference estuary, Goiana estuarine system (GES). On the other hand, the Timbó estuarine system (TES) had the lowest Shannon index value and richness, while the Capibaribe estuarine system (CES) had the lowest evenness value. The latter two estuaries (TES and CES) presented intermediate and high levels of urbanization, respectively. The ecological quality assessment (EcoQ) in the studied estuaries was classified from Poor to Moderate and the estuary with the lowest demographic density in its surroundings, GES, showed a better ecological quality (Moderate EcoQ). A significant distance-based multivariate linear modelling regression (DistLM) was observed between the environmental variables and the density of the meiobenthic community, where PAHs and pH were the main contributors to organism variation. The sediments were characterized by predominance of very fine sand and silt-clay in the most polluted environments, while the control site environment (GES) was dominated by medium grains. The highest concentrations of PAHs were found in the most urbanized estuaries, and directly affected the structure of the interstitial benthic community. The metrics used in the present study proved to be adequate for assessing the environmental quality of the investigated estuaries.

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“…inputs from rivers (Noriega et al, 2019). In the case of the Paraguaçu River estuary, the influence of the Pedra do Cavalo dam that controls the flow of freshwater in the estuarine gradient must be considered, which ats as a physical barrier, retaining the material in the river channel.…”

Section: Discussionmentioning

confidence: 99%

Phytoplankton community in a tropical estuarine gradient after an exceptional harmful bloom of Akashiwo sanguinea (Dinophyceae) in the Todos os Santos Bay

et al. 2021

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Trophic dynamics (Dissolved Inorganic Nitrogen-DIN and Dissolved Inorganic Phosphorus-DIP) in tropical urban estuarine systems during periods of high and low river discharge rates

Abstract: Inorganic Nitrogen-DIN and Dissolved Inorganic Phosphorus-DIP) in tropical urban estuarine systems during periods of high and low river discharge rates. An Acad Bras Cienc 91: e20180244.

Cited by 5 publications

References 18 publications

Dissolved Inorganic Nutrient Biogeochemistry in an Urbanized Coastal Region: A Study of Dapeng Cove, Shenzhen

Dissolved Inorganic Nutrient Biogeochemistry in an Urbanized Coastal Region: A Study of Dapeng Cove, Shenzhen

Effects of PAHs on meiofauna from three estuaries with different levels of urbanization in the South Atlantic

Phytoplankton community in a tropical estuarine gradient after an exceptional harmful bloom of Akashiwo sanguinea (Dinophyceae) in the Todos os Santos Bay

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