Coupled effects of anthropogenic nutrient sources and meteo-oceanographic events in the trophic state of a subtropical estuarine system

Cabral, Alex; Fonseca, Alessandra

doi:10.1016/j.ecss.2019.05.010

Cited by 12 publications

(7 citation statements)

References 65 publications

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“…The use and inadequate release of fertilizers are the main sources of anthropogenic nitrogen in estuaries, with a global input of ∼118 × 10 9 kg N yr −1 (Lu and Tian, 2017;Malone and Newton, 2020). In addition to the resuspended sediments, excess residual organic matter from farming and the use of pesticides significantly decrease water quality in the effluent-receiving ecosystem (Barraza-Guardado et al 2014;Cabral and Fonseca, 2019). Adding to that is the fact that only 32% of the city's sewage is properly treated (IBGE, 2010).…”

Section: Discussionmentioning

confidence: 99%

“…Rising urbanization and land use are major threats to coastal environments worldwide (Hader et al, 2020). Estuaries have been directly Silva et al affected by anthropogenic activities, including the release of fertilizer and untreated sewage (Alves et al, 2013;Cabral and Fonseca, 2019). These effluents are loaded with organic nutrients, especially nitrogen and phosphorus, and are generally associated with heavy metals and other potential pollutants (Clark et al, 2017;Zhang et al, 2017;Chen et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the trophic status in a tropical estuarine system

et al. 2022

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Estuaries are extremely valuable ecosystems and have been affected by several anthropogenic activities from urban growth and industrial development, such as the release of untreated effluents which decrease water quality. This study aimed to evaluate the seasonal and temporal trophic status variation in the Formoso River Estuarine System (FRES), a tropical estuary. Three campaigns were carried out in each season (rainy and dry), during which surface water was sampled for abiotic parameter analyses. The TRIX index was used for trophic status assessment. For the temporal evaluation, a review of literature addressing the matter in the study area was conducted. Between 2017 and 2018, the TRIX index varied from a mean of 6 ± 0.2 upstream to 5 ± 0.4 downstream during the rainy season, indicating eutrophic conditions throughout most of the FRES extension, especially near the Formoso River, and from 6 ± 1 to 3 ± 0.8 during the dry season. Temporal analyses showed that in 2002 the overall mean TRIX index was 5.72 ± 0.4, decreasing in 2005 and 2014, and followed by an upwards trend. We conclude that the FRES is impacted by the release of untreated effluents such as sewage and fertilizers from the city of Rio Formoso and from various agricultural activities, which are more intense during the rainy season. Nevertheless, over time there were more critical scenarios pertaining to the trophic status. The present diagnosis reinforces the importance of public sanitation policies in estuarine regions and spatial planning instruments for pollution control in fishery areas.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of the trophic status in a tropical estuarine system

et al. 2022

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“…Denitrification, a pivotal process to improve water quality, control trophic states, and regulate nutrient cycling in bays, is essentially a bacterial-mediated nitrification and denitrification process that removes bioavailable nitrogen from the water column and releases it into the atmosphere in the form of molecular nitrogen. This phenomenon has been observed in numerous estuaries and bays worldwide [90]. It has been established that the LOICZ model calculates nitrogen fixation and denitrification in the sea area based on mass balance and CNP stoichiometry.…”

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

confidence: 97%

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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“…Articles from the management discipline numbered only 24 publications, distributed in 22 different countries where China and Bangladesh had 2 publications each, showing a homogenous distribution of articles over the world (Figure 2b). The year of publications of land-sea interactions, based in our criteria of research, began in 1997 with the studies of Naudin et al [23] and Wass et al [24], maintaining a similar rate of publications until 2019, where articles reached a peak with publications from diverse disciplines (e.g., [25][26][27][28]) (Figure 2). Despite the increasing number of articles in recent years, we observed in general a low number of articles on this topic.…”

Section: Location Of Study and Years Of Publicationmentioning

confidence: 99%

Land–Sea Interactions and Ecosystem Services: Research Gaps and Future Challenges

2023

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The land–sea interface is essential for understanding the interconnectedness of terrestrial and marine ecosystems and provides ecosystem services to people. Although research has been conducted on both ecosystems, knowledge about their interactions remains limited. While there has been growing research interest on land–sea interactions over the last decade, other types of knowledge system such as local or indigenous knowledge have not yet been included. The goal of this study is to review the literature related to land–sea interactions using an ecosystem services framework to help classify existing research. A systematic review of the literature was employed by searching peer-reviewed publications in Web of Science using land–sea interaction keywords. The synthesis identified 166 publications. The findings indicate that the primary disciplines that have investigated land–sea interactions were biogeochemistry and ecology, with a focus on nutrients and interactions. In terms of ecosystem services, supporting and regulating services were the most researched, with urbanization and agricultural and forestry effluents as main studied drivers. Results reveal a need for a more comprehensive view of land–sea interactions that recognizes the critical role that social factors play in shaping the sustainability of these systems. Therefore, a future challenge involves using a more holistic approach to the study and management of land–sea interactions.

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Coupled effects of anthropogenic nutrient sources and meteo-oceanographic events in the trophic state of a subtropical estuarine system

Cited by 12 publications

References 65 publications

Assessment of the trophic status in a tropical estuarine system

Assessment of the trophic status in a tropical estuarine system

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

Land–Sea Interactions and Ecosystem Services: Research Gaps and Future Challenges

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