Discerning the Causes of Toxic Cyanobacteria (Lyngbya majuscula) Blooms in Moreton Bay, Australia

O’Neil, Judith M.; Dennison, William C.

doi:10.1007/978-3-319-30259-1_21

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…This implies that significant volumes of fresh groundwater transport through the soil profiles at depth, transporting chemical solutes (including dissolved Fe(II)) to the adjacent intertidal area in Deception Bay, Queensland, Australia (Albert et al, 2005). The benthic release of Fe(II) was further validated through additional field and laboratory studies (Ahern et al, 2006a;Hanington et al, 2016;O'Neil and Dennison, 2016). Additionally, as emphasized in Section 4.4, biogeochemical mechanisms, particularly microbial reduction processes driven by Fe-reducing bacteria, may potentially convert Fe(III) to Fe(II) under anaerobic conditions, thereby facilitating the remobilization of Fe oxides in marine sediments.…”

Section: Sources Of Fe and Mobilization Of Subterranean Fementioning

confidence: 99%

Porewater exchange and iron transformation in a coastal groundwater system: a field investigation, driving mechanisms analysis, and conceptual model

Cao,

Hofmann,

Yan

et al. 2024

Front. Mar. Sci.

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The high concentration of dissolved iron (Fe) in coastal waters triggers Lyngbya blooms in the Moreton Bay region of Southeast Queensland, Australia. Previous studies have provided a restricted understanding of how land-derived Fe is transported and then transformed into other forms (e.g., Fe oxides) before its release into the ocean. Here, a field investigation was conducted at a sandy beach on the northern end of Deception Bay, Queensland, Australia, focusing on porewater exchange and Fe transformation. This study revealed that tides provided a significant mechanism for driving the groundwater-seawater mixing in the intertidal area. Such forcing formed an upper saline plume (USP) with high dissolved oxygen (DO), creating a dynamic reaction zone for Fe oxidation and precipitation beneath the USP. The spatial distribution of Fe oxides highlighted a substantial Fe content in the subsurface, providing concrete evidence for the transformation of Fe from an aqueous state to a solid form. It also exhibited a low-permeable area that served as a geochemical barrier, absorbing chemical components like phosphate. These findings can assist in constructing a more accurate transport model that couples physical and geochemical processes to quantify the mechanisms driving Fe transformation in coastal areas and further deepen our comprehension of the hydrogeochemical functionalities in land-ocean connectivity via groundwater.

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Section: Sources Of Fe and Mobilization Of Subterranean Fementioning

confidence: 99%

Porewater exchange and iron transformation in a coastal groundwater system: a field investigation, driving mechanisms analysis, and conceptual model

Cao,

Hofmann,

Yan

et al. 2024

Front. Mar. Sci.

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“…As illustrated in Figure 4, early research revealed the elevated concentration of dissolved Fe(II) in the streams flowing into Deception Bay (northwest end of Moreton Bay), Queensland, Australia [40]. It has been identified as a key factor contributing to the occurrence of Lynbya blooms in the coastal area [41]. Subsequent field studies on the Deception Bay catchment and Caboolture River sub-catchment (Queensland, Australia) discovered that the outcropping sediments contained ironstone and Fe minerals (up to 8.5%).…”

Section: Field Investigationsmentioning

confidence: 99%

“…The conceptual model of CUA systems has been in existence for 20 years, with the GDT recognized as an important pathway for delivering land-derived chemicals (e.g., N, P, Fe, and DOM) to nearshore environments [11]. This potentially contributes to coastal pollution, as Lyngbya blooms were reported in many parts of Queensland, Australia [41], which threaten coral populations and marine ecosystems. To date, most research efforts have been devoted to addressing physical processes in intertidal areas, with little emphasis on their coupling with geochemical processes (e.g., oxidative precipitation of Fe(II)).…”

Section: Knowledge Gaps and Research Needsmentioning

confidence: 99%

State of the Art on Fe Precipitation in Porous Media: Hydrogeochemical Processes and Evolving Parameters

Cao,

Yan,

Hofmann

et al. 2024

JMSE

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The mixing of terrestrial groundwater and seawater creates dynamic reaction zones in intertidal areas, where land-derived Fe(II) is oxidized to Fe(III) and then precipitates as Fe hydroxides at the groundwater–seawater interface. These hydrogeochemical processes contribute to the formation of iron bands at the saltwater wedge (SW) and beneath the upper saline plume (USP). This study provides a comprehensive review of physical and geochemical processes at field scale in coastal areas, explores the impact of mineral precipitation on pore structure at pore scale, and synthesizes reactive transport modeling (RTM) approaches for illustrating continuum-scale soil physio-chemical parameters during the evolution of porous media. Upon this review, knowledge gaps and research needs are identified. Additionally, challenges and opportunities are presented. Therefore, we reach the conclusion that the incorporation of observational data into a comprehensive physico-mathematical model becomes imperative for capturing the pore-scale processes in porous media and their influence on groundwater flow and solute transport at large scales. Additionally, a synergistic approach, integrating pore-scale modeling and non-invasive imaging, is equally essential for providing detailed insights into intricate fluid–pore–solid interactions for future studies, as well as facilitating the development of regional engineering-scale models and physio-chemical coupled models with diverse applications in marine science and engineering.

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Natural and anthropogenic dispersal of cyanobacteria: a review

Curren

Leong

2020

Hydrobiologia

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Discerning the Causes of Toxic Cyanobacteria (Lyngbya majuscula) Blooms in Moreton Bay, Australia

Cited by 4 publications

References 30 publications

Porewater exchange and iron transformation in a coastal groundwater system: a field investigation, driving mechanisms analysis, and conceptual model

Porewater exchange and iron transformation in a coastal groundwater system: a field investigation, driving mechanisms analysis, and conceptual model

State of the Art on Fe Precipitation in Porous Media: Hydrogeochemical Processes and Evolving Parameters

Natural and anthropogenic dispersal of cyanobacteria: a review

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