The role of bioirrigation in sediment phosphorus dynamics and blooms of toxic cyanobacteria in a temperate lagoon

Zhu, Yafei; Hipsey, Matthew R.; McCowan, Andrew; Beardall, John; Cook, Perran

doi:10.1016/j.envsoft.2016.09.023

Cited by 9 publications

(7 citation statements)

References 53 publications

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“…In the following summer, a large toxic cyanobacteria bloom occurred in the lakes that persisted from mid-November 2011 to the end of January 2012. It was found that sediment phosphorus release as a result of depleted bottom DO rather than catchment load supplied most of the phosphorus to support the development of the bloom (Zhu et al, 2016).…”

Section: Study Sitementioning

confidence: 99%

“…We have previously shown that the primary source of phosphorus fuelling summer blooms of N-fixing cyanobacteria was from the sediment (Scicluna et al, 2015;Zhu et al, 2016). This sediment release of phosphorus was induced by hypoxia, which was in turn driven by internal primary production.…”

Section: Internal Nutrient Dynamicsmentioning

confidence: 99%

“…The coupled model was calibrated and validated for the period between May 2010 and July 2012 and it has reproduced the hydrodynamic and biogeochemical conditions in the lakes well and successfully replicated the 2011-2012 summer cyanobacterial bloom (Zhu et al, 2016).…”

Section: Model Descriptionmentioning

confidence: 99%

“…Therefore, it was assumed that 60 % of the catchment organic nutrient loads were labile and the rest were refractory and not bioavailable over the timescale of water residence time. Therefore, a very low mineralisation rate (0.005 day −1 ) was used for the refractory portion (Zhu et al, 2016).…”

Section: Nutrient Scenariosmentioning

confidence: 99%

“…The coupled model used in the current study was developed by Zhu et al (2016) using DHI's MIKE3 FM and ECO Lab. The model consists of two components, the hydrodynamic model and the biogeochemical model.…”

Section: Model Descriptionmentioning

confidence: 99%

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Effects of changes in nutrient loading and composition on hypoxia dynamics and internal nutrient cycling of a stratified coastal lagoon

2017

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Abstract. The effects of changes in catchment nutrient loading and composition on the phytoplankton dynamics, development of hypoxia and internal nutrient dynamics in a stratified coastal lagoon system (the Gippsland Lakes) were investigated using a 3-D coupled hydrodynamic biogeochemical water quality model. The study showed that primary production was equally sensitive to changed dissolved inorganic and particulate organic nitrogen loads, highlighting the need for a better understanding of particulate organic matter bioavailability. Stratification and sediment carbon enrichment were the main drivers for the hypoxia and subsequent sediment phosphorus release in Lake King. High primary production stimulated by large nitrogen loading brought on by a winter flood contributed almost all the sediment carbon deposition (as opposed to catchment loads), which was ultimately responsible for summer bottom-water hypoxia. Interestingly, internal recycling of phosphorus was more sensitive to changed nitrogen loads than total phosphorus loads, highlighting the potential importance of nitrogen loads exerting a control over systems that become phosphorus limited (such as during summer nitrogen-fixing blooms of cyanobacteria). Therefore, the current study highlighted the need to reduce both total nitrogen and total phosphorus for water quality improvement in estuarine systems.

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Section: Study Sitementioning

confidence: 99%

Section: Internal Nutrient Dynamicsmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

Section: Nutrient Scenariosmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

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Effects of changes in nutrient loading and composition on hypoxia dynamics and internal nutrient cycling of a stratified coastal lagoon

2017

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Respiration and aeration by bioturbating Tubificidae alter biogeochemical processes in aquatic sediment

et al. 2018

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This study investigates the potential of bioturbating Tubificidae to alter biogeochemical processes by sediment aeration in order to enhance ecosystem development in eco-engineering projects. We introduced Tubificidae in three different densities (5000, 15,000, and 30,000 individuals m −2 ) in clay-rich sediment from lake Markermeer (The Netherlands). Redox potential, nutrients and major elements were measured from the water column and porewater at different depths. Mineral phase and redox transfers were chemically modelled and oxygen concentrations in bioturbated sediments for each density were mathematically predicted. The measured results of this experiment showed that Tubificidae oxygenated the upper 15 mm of the sediment. This resulted in decomposition of sedimentary organic matter with an associated sixfold increase in NH 4 and NO x concentrations in the porewater and the water column. However, phosphorus concentrations were declining in the upper 16 mm, likely as a result of immobilization by pyrite oxidation and production of iron oxides. These bioturbation effects were highest in the treatment with an intermediate density of Tubificidae (15,000 worms m −2 ) as aeration effects in the treatment with the highest density of Tubificidae (30,000 worms m −2 ) was impeded by high respiration rates. Furthermore, with a two dimensional diffusion model, simulated effects of respiration and aeration on the oxygen concentration in the sediment suggest that the bioturbation effect is strongest at a density of 12,000 worms m −2 . In ecological engineering projects where fast ecosystem development is important, introducing Tubificidae to aquatic sediments to optimal densities might enhance initial ecosystem development due to improved availability of nitrogen as nutrient.

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Peel-Harvey Estuary, Western Australia

Valesini

Hallett

Hipsey

et al. 2019

Coasts and Estuaries

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The role of bioirrigation in sediment phosphorus dynamics and blooms of toxic cyanobacteria in a temperate lagoon

Cited by 9 publications

References 53 publications

Effects of changes in nutrient loading and composition on hypoxia dynamics and internal nutrient cycling of a stratified coastal lagoon

Effects of changes in nutrient loading and composition on hypoxia dynamics and internal nutrient cycling of a stratified coastal lagoon

Respiration and aeration by bioturbating Tubificidae alter biogeochemical processes in aquatic sediment

Peel-Harvey Estuary, Western Australia

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