Deep dynamic pools of phosphorus in the sediment of a temperate lagoon with recurring blooms of diazotrophic cyanobacteria

Scicluna, Todd Richard; Woodland, Ryan J.; Zhu, Yafei; Grace, Mike; Cook, Perran

doi:10.1002/lno.10162

Cited by 12 publications

(17 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Site S3 was chosen for an in-depth study of the relationships between the variables. Unlike lakes and estuaries, hypoxia and anoxia in river water are driven by catchment inflows and stratification (Scicluna et al, 2015). Seasonal hypoxia in shallow rivers may be induced by pollution inputs, seasonal rainfall, and temperature (Wang et al, 2016).…”

Section: Tablementioning

confidence: 99%

Do NH 3 and chemical oxygen demand induce continuous release of phosphorus from sediment in heavily polluted rivers?

Zhang

Jin

Zhu

et al. 2017

Ecological Engineering

View full text Add to dashboard Cite

a b s t r a c tWhile phosphorus (P) is a vital element in freshwater systems, excessive P loads will induce eutrophication. Large inputs of various pollutants, including P, to rivers in semi-arid regions result in complex environmental problems. In this study, we investigate dissolved oxygen (DO), ammoniacal nitrogen (NH 3 ), chemical oxygen demand (CODcr), soluble reactive P (SRP) in surface water and pore water, and sediment P in the Niuwei River, within the Hai River Basin. From our results we developed and tested a theory for P release in semi-arid regions driven by DO. The results show that NH 3 and CODcr can cause variations in DO in surface water. The presence of pollutants at high concentrations caused seasonal hypoxia. Hypoxic river water induced adsorption and hydrolysis of NaOH-Pi and labile organic P (L-Po), which then resulted in increased SRP concentrations in pore water and surface water. Overall, our results illustrate that NH 3 and CODcr may be important for P adsorption and desorption and for management of water quality problems in rivers in semi-arid regions.

show abstract

Section: Tablementioning

confidence: 99%

Do NH 3 and chemical oxygen demand induce continuous release of phosphorus from sediment in heavily polluted rivers?

Zhang

Jin

Zhu

et al. 2017

Ecological Engineering

View full text Add to dashboard Cite

show abstract

“…4) is consistent with increased hypoxia in this period (Zillen and Conley, 2010). A key effect of this would be to enhance the release of phosphorus from the sediment, which is a key driver of N. spumigena blooms in the Gippsland Lakes (Cook et al, 2010;Scicluna et al, 2015).…”

Section: Cyanobacteria Blooms and Eutrophicationmentioning

confidence: 99%

“…The generally lower sediment δ 15 N values prior to 1870 (below 130 cm) are consistent with this. Second, cyanobacterial blooms are driven by a focused release of phosphorus from the sediments during bottom water hypoxia or anoxia, and it was estimated that a large recent bloom of N. spumigena was caused by a release of ∼ 25 t of phosphorus from the sediment in Lake King (Scicluna et al, 2015). Given that phosphorus is trapped and effectively recycled in periodically anoxic and high residence time systems such as the Gippsland Lakes, it is plausible that a pre-European phosphorus catchment load of 50 t per year could maintain blooms of at least the same magnitude as currently observed (Grayson et al, 2001).…”

Section: Cyanobacteria Blooms and Eutrophicationmentioning

confidence: 99%

Blooms of cyanobacteria in a temperate Australian lagoon system post and prior to European settlement

et al. 2016

Self Cite

View full text Add to dashboard Cite

Abstract. Blooms of noxious N 2 fixing cyanobacteria such as Nodularia spumigena are a recurring problem in some estuaries; however, the historic occurrence of such blooms in unclear in many cases. Here we report the results of a palaeoecological study on a temperate Australian lagoon system (the Gippsland Lakes) where we used stable isotopes and pigment biomarkers in dated cores as proxies for eutrophication and blooms of cyanobacteria. Pigment proxies show a clear signal, with an increase in cyanobacterial pigments (echinenone, canthaxanthin and zeaxanthin) in the period coinciding with recent blooms. Another excursion in these proxies was observed prior to the opening of an artificial entrance to the lakes in 1889, which markedly increased the salinity of the Gippsland Lakes. A coincident increase in the sediment organic-carbon content in the period prior to the opening of the artificial entrance suggests that the bottom waters of the lakes were more stratified and hypoxic, which would have led to an increase in the recycling of phosphorus. After the opening of the artificial entrance, there was a ∼ 60-year period with low values for the cyanobacterial proxies as well as a low sediment organic-carbon content suggesting a period of low bloom activity associated with the increased salinity of the lakes. During the 1940s, the current period of re-eutrophication commenced, as indicated by a steadily increasing sediment organic-carbon content and cyanobacterial pigments. We suggest that increasing nitrogen inputs from the catchment led to the return of hypoxia and increased phosphorus release from the sediment, which drove the reemergence of cyanobacterial blooms.

show abstract

“…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%

“…High primary production as a result of eutrophication can lead to hypoxia or anoxia in poorly mixed bottom water and subsequently enhance the recycling of both nitrogen and phosphorus, which again can reinforce eutrophication (Correll, 1998). This has been found in many stratified estuarine systems around the world, including the Baltic Sea (Vahtera et al, 2007) and the Black Sea (Capet et al, 2016), the Neuse River Estuary (Paerl et al, 1995), and the Gippsland Lakes (Scicluna et al, 2015). The magnitude of sediment phosphorus release is related to severity of bottom-water dissolved oxygen (DO) depletion as well as the duration of hypoxia and/or anoxia.…”

Section: Introductionmentioning

confidence: 97%

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

2017

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Deep dynamic pools of phosphorus in the sediment of a temperate lagoon with recurring blooms of diazotrophic cyanobacteria

Cited by 12 publications

References 34 publications

Do NH 3 and chemical oxygen demand induce continuous release of phosphorus from sediment in heavily polluted rivers?

Do NH 3 and chemical oxygen demand induce continuous release of phosphorus from sediment in heavily polluted rivers?

Blooms of cyanobacteria in a temperate Australian lagoon system post and prior to European settlement

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

Contact Info

Product

Resources

About