Response of sedimentary processes to cyanobacteria loading

Žilius, Mindaugas; Wit, Rutger de; Bartoli, Marco

doi:10.4081/jlimnol.2015.1296

Cited by 8 publications

(9 citation statements)

References 61 publications

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“…Indeed, the spring and summer planktonic OM did not only differ in terms of taxonomic composition, but they also displayed a twofold difference in bulk C : N ratio (Table 1). In the summer plankton material, the C : N ratio of 5.6 was close to that of live zooplankton and cyanobacteria (Walve and Larsson 2010;Zilius et al 2016), while the C : N ratio of 10.9 in the spring plankton material was higher than observed in the water column (Walve and Larsson 2010). Although plankton C : N ratio-especially for phytoplankton-can vary depending on environmental conditions (Geider and La Roche 2002), high C : N ratio can also be indicative of decaying OM (Jiao et al 2010).…”

Section: Effects Of Om Quality On Nitrogen Cyclingmentioning

confidence: 85%

Influence of settling organic matter quantity and quality on benthic nitrogen cycling

Albert

Bonaglia

Stjärnkvist

et al. 2021

Limnology & Oceanography

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Coastal sediments are major contributors to global carbon (C) mineralization and nutrient cycling and are tightly linked to processes in the pelagic environment. In this study, we aimed to investigate the regulating potential of quantity and quality of planktonic organic matter (OM) deposition on benthic metabolism, with a particular focus on nitrogen (N) cycling processes. We simulated inputs of spring (C : N 10.9) and summer (C : N 5.6) plankton communities in high and low quantities to sediment cores, and followed oxygen consumption, nutrient fluxes as well as nitrate reduction rates, that is, denitrification and dissimilatory nitrate reduction to ammonium for 10 d. Our results demonstrate the primary importance of OM quality in determining the fate of organic N once it settles to the sediment surface. Settling of N-rich summer plankton material resulted in a $ twofold lower denitrification efficiency (40-56%) compared to N-poor spring plankton (88-115%). This indicates that N-rich plankton deposition favors recycling of inorganic nutrients to the water column over N-loss via denitrification. OM quantity was positively related to mineralization activity, but this neither directly affected N fluxes nor denitrification activity, highlighting the complex interplay between the OM quantity and quality in regulating N cycling. In light of these new findings, we support the use of simple qualitative indicators such as C : N ratio of OM to investigate how future changes in benthic-pelagic coupling might influence N budgets at the sediment-water interface.

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Section: Effects Of Om Quality On Nitrogen Cyclingmentioning

confidence: 85%

Influence of settling organic matter quantity and quality on benthic nitrogen cycling

Albert

Bonaglia

Stjärnkvist

et al. 2021

Limnology & Oceanography

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“…Here, benthic algae oxidize the upper sediment layer and efficiently retain nutrients, thereby impeding regeneration to the water column (Zilius et al, 2012;Benelli et al, 2018). Deeper sites were always heterotrophic and their seasonal oxygen metabolism and nutrient regeneration was driven by water temperature and phytoplankton blooms; recently settled fresh phytoplankton resulted in significantly higher oxygen uptake, limited oxygen penetration in sediments ( < 1 mm), and high rates of anaerobic to aerobic metabolism (Zilius et al, 2012(Zilius et al, , 2016.…”

Section: Sediments and Benthic Processes As Drivers Of Bloomsmentioning

confidence: 99%

“…The mechanisms underlying P release from sediments were analyzed in detail, as they contribute to lower inorganic DIN:DIP ratio in the water column and favor cyanobacteria (Zilius et al, , 2015(Zilius et al, , 2016Petkuviene et al, 2016). The distribution of sedimentary pools of P, Fe, Mn and S in the Curonian Lagoon was related to riverine influence; sandy sediments adjacent the Nemunas delta were oxidized and have a large geochemical buffer capacity against the effects of anoxia, with limited accumulation of free sulfide (Petkuviene et al, 2016).…”

Section: Sediments and Benthic Processes As Drivers Of Bloomsmentioning

confidence: 99%

“…Muddy areas along the western and southern portion of the lagoon had chemically reduced sediments where the reduction of iron may result in large P release (Petkuviene et al, 2016). In manipulative experimental studies, simulated deposition of phytoplankton material, primarily composed of cyanobacteria, resulted in an increase of dissimilative nitrate reduction over denitrification and large methane production, but with limited reactive P release (Zilius et al, 2016). Experimental manipulations of intact cores, targeting short-term effects of anoxia, revealed that pools of detritial Ca bound P ( > 70 % of inorganic P) and oxidized Fe and Mn, prevent or buffer redox-dependent reactive P release from sediments (Zilius et al, 2015).…”

Section: Sediments and Benthic Processes As Drivers Of Bloomsmentioning

confidence: 99%

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Drivers of Cyanobacterial Blooms in a Hypertrophic Lagoon

et al. 2018

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The Curonian Lagoon is Europe's largest lagoon and one of the most seriously impacted by harmful blooms of cyanobacteria. Intensive studies over the past 20 years have allowed us to identify the major drivers determining the composition and spatial extent of hyperblooms in this system. We summarize and discuss the main outcomes of these studies and provide an updated, conceptual scheme of the multiple interactions between climatic and hydrologic factors, and their influence on internal and external processes that promote cyanobacterial blooms. Retrospective analysis of remote sensed images demonstrated the variability of blooms in terms of timing, extension and intensity, suggesting that they occur only under specific circumstances. Monthly analysis of nutrient loads and stoichiometry from the principal tributary (Nemunas River) revealed large interannual differences in the delivery of key elements, but summer months were always characterized by a strong dissolved inorganic N (and Si) limitation, that depresses diatoms and favors the dominance of cyanobacteria. Cyanobacteria blooms occurred during high water temperatures, long water residence time and low-wind conditions. The blooms induce transient (night-time) hypoxia, which stimulates the release of iron-bound P, producing a positive feedback for blooms of N-fixing cyanobacteria. Consumermediated nutrient recycling by dreissenid mussels, chironomid larvae, cyprinids and large bird colonies, may also affect P availability, but their role as drivers of cyanobacteria blooms is understudied.

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“…Such sediment cores may thus not be representative of in situ sediment due to the oxic layer and NO 3 − reducing zones having been disturbed to varying degrees. Complications from sampling sediments with high gas contents have led to issues while conducting ex situ experiments with IPT (Zilius et al , S. Hietanen, unpubl. data).…”

Section: Environmental Challenges When Applying the Iptmentioning

confidence: 99%

Application of the isotope pairing technique in sediments: Use, challenges, and new directions

Robertson

Bartoli

Brüchert

et al. 2019

Limnology & Ocean Methods

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Determining accurate rates of benthic nitrogen (N) removal and retention pathways from diverse environments is critical to our understanding of process distribution and constructing reliable N budgets and models. The whole‐core 15N isotope pairing technique (IPT) is one of the most widely used methods to determine rates of benthic nitrate‐reducing processes and has provided valuable information on processes and factors controlling N removal and retention in aquatic systems. While the whole core IPT has been employed in a range of environments, a number of methodological and environmental factors may lead to the generation of inaccurate data and are important to acknowledge for those applying the method. In this review, we summarize the current state of the whole core IPT and highlight some of the important steps and considerations when employing the technique. We discuss environmental parameters which can pose issues to the application of the IPT and may lead to experimental artifacts, several of which are of particular importance in environments heavily impacted by eutrophication. Finally, we highlight the advances in the use of the whole‐core IPT in combination with other methods, discuss new potential areas of consideration and encourage careful and considered use of the whole‐core IPT. With the recognition of potential issues and proper use, the whole‐core IPT will undoubtedly continue to develop, improve our understanding of benthic N cycling and allow more reliable budgets and predictions to be made.

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Response of sedimentary processes to cyanobacteria loading

Abstract: Sedimentation of pelagic cyanobacteria in dystrophic freshwater and oligohaline lagoons results in large inputs

Cited by 8 publications

References 61 publications

Influence of settling organic matter quantity and quality on benthic nitrogen cycling

Influence of settling organic matter quantity and quality on benthic nitrogen cycling

Drivers of Cyanobacterial Blooms in a Hypertrophic Lagoon

Application of the isotope pairing technique in sediments: Use, challenges, and new directions

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