Estuarine Phytoplankton

Paerl, Hans W.; Justić, Dubravko

doi:10.1002/9781118412787.ch4

Cited by 8 publications

(7 citation statements)

References 139 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example at LP, dinoflagellates dominated (53.4% and 70% of the overall phytoplankton biomass respectively) when total nutrients (P and N) where high in June 2011 and when total nutrients were low in August 2011. Nutrient ratios are also known to influence phytoplankton groups in different ways (Pedersen and Borum, 1996;Turner et al, 1998;Pearl and Justi c, 2013), however, changes in the DIN:DIP ratio in this study could not be linked to phytoplankton abundance and biomass or taxonomic diversity.…”

Section: Discussioncontrasting

confidence: 70%

Resilience of estuarine phytoplankton and their temporal variability along salinity gradients during drought and hypersalinity

Nche-Fambo

Scharler

Tirok

2015

Estuarine, Coastal and Shelf Science

View full text Add to dashboard Cite

Section: Discussioncontrasting

confidence: 70%

Resilience of estuarine phytoplankton and their temporal variability along salinity gradients during drought and hypersalinity

Nche-Fambo

Scharler

Tirok

2015

Estuarine, Coastal and Shelf Science

View full text Add to dashboard Cite

“…Eutrophication in estuarine and coastal environments is a complex phenomenon affected by many different factors, but of fundamental importance is nutrient, specifically N, overenrichment. ,, Anthropogenic N sources include nonpoint (e.g., agricultural and stormwater runoff, groundwater, and atmospheric inputs) and point sources (industrial and urban wastewater inputs). We acknowledge that given these diverse sources, coastal eutrophication is not solely be driven by the increased release of LMW-DON from WWTPs after upgrades to BNR.…”

Section: Resultsmentioning

confidence: 99%

“…WWTPs upgraded to BNR have significantly decreased total N loads to their receiving coastal waters. For example, a total maximum daily load (TMDL) was established for the Long Island Sound (LIS) in 1995; the goal was to reduce anthropogenic N loads by 58.5% by 2014 (NYSED and CTDEEP, 2000), and 70% of this goal was achieved by 2010, primarily through upgrades of regional WWTPs. , However, despite the successful reduction of N loads, accelerating eutrophication and hypoxia continue to plague the LIS. , These observations are not limited to the LIS; many other urbanized coastal systems are continuing to experience eutrophication, even after a significant decrease of N loads through upgrades of WWTPs. , It is also worth noting that the phytoplankton community composition in these coastal environments has shifted toward an increase in harmful taxa, including dinoflagellates and cyanobacteria (most commonly non-N 2 fixing cyanobacteria, such as Microcystis ). ,− Multiple factors, such as changes in climate and input of N from nonpoint sources, ,, should be considered together for this “paradox” (i.e., decrease in total N input but increase in phytoplankton bloom) . However, these unexpected observations also raise the possibility that some aspects of BNR, especially predenitrification BNR, yield environmental responses, as yet overlooked.…”

Section: Introductionmentioning

confidence: 99%

Formation of Low-Molecular-Weight Dissolved Organic Nitrogen in Predenitrification Biological Nutrient Removal Systems and Its Impact on Eutrophication in Coastal Waters

Eom

Borgatti²,

Paerl

et al. 2017

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

To alleviate eutrophication in coastal waters, reducing nitrogen (N) discharge from wastewater treatment plants (WWTPs) by upgrading conventional activated sludge (CAS) to biological nutrient removal (BNR) processes is commonplace. However, despite numerous upgrades and successful reduction of N discharge from WWTPs, eutrophication problems persist. These unexpected observations raise the possibility that some aspects of BNR yield environmental responses as yet overlooked. Here, we report that one of the most common BNR processes, predenitrification, is prone to the production of low-molecular-weight dissolved organic N (LMW-DON), which is highly bioavailable and stimulates phytoplankton blooms. We found that in predenitrification BNR, LMW-DON is released during the post-aerobic step following the preanoxic step, which does not occur in CAS. Consequently, predenitrification systems produced larger amount of LMW-DON than CAS. In estuarine bioassays, predenitrification BNR effluents produced more phytoplankton biomass than CAS effluents despite lower N concentrations. This was also supported by stronger correlations found between phytoplankton biomass and LMW-DON than other N forms. These findings suggest that WWTPs upgraded to predenitrification BNR reduce inorganic N discharge but introduce larger quantities of potent LMW-DON into coastal systems. We suggest reassessing the N-removal strategy for WWTPs to minimize the eutrophication effects of effluents.

show abstract

“…All pigment profiles were dominated by Chl a , fucoxanthin, and Chl c1,c2 , suggesting phytoplankton communities were dominated by diatoms (Drinovec et al ; Paerl and Justić ) (Supporting Information Figs. S5, S6).…”

Section: Resultsmentioning

confidence: 99%

Quantity and quality of particulate organic matter controls bacterial production in the Columbia River estuary

Crump

Fine

Fortunato

et al. 2017

Limnology & Oceanography

View full text Add to dashboard Cite

Estuaries function as “bioreactors” for fluvial materials in which microbial, biogeochemical, and ecological processes transform organic matter and nutrients prior to export to coastal oceans. The impact of estuarine bioreactors is linked to the bioavailability and residence time of fluvial material, and to rates of microbial activity. In the Columbia River estuary, water residence time is short (approximately 2 d), but particle residence time is extended by estuarine turbidity maxima (ETM). To investigate relationships between organic matter and microbial activity, samples were collected in spring and fall 2012 and summer 2013, and ETM particles were fractionated by settling velocity using an Owen‐style settling column. Data were also analyzed from 16 other sampling campaigns conducted in 1990–2009. The composition of suspended particulate matter shifted seasonally following the spring freshet and river phytoplankton bloom with decreasing organic content, increasing C/N ratio, and an increasing contribution of autochthonous particulate organic matter (POM) produced in four shallow lateral bays (based on del‐PO13C and pigment ratios). Heterotrophic bacterial production responded to seasonal changes in POM and correlated most strongly with estimates of labile particulate nitrogen during any particular season, and with the riverine flux of chlorophyll a (Chl a) across all seasons. Regression models suggest that labile particulate nitrogen and bacterial production can be predicted from sensor‐based measurements including turbidity, salinity, and temperature in the estuary and Chl a in the river. These results demonstrate that heterotrophic activity in the Columbia River estuary is controlled by POM lability, and by the degree to which ETM retain and concentrate POM.

show abstract

Estuarine Phytoplankton

Cited by 8 publications

References 139 publications

Resilience of estuarine phytoplankton and their temporal variability along salinity gradients during drought and hypersalinity

Resilience of estuarine phytoplankton and their temporal variability along salinity gradients during drought and hypersalinity

Formation of Low-Molecular-Weight Dissolved Organic Nitrogen in Predenitrification Biological Nutrient Removal Systems and Its Impact on Eutrophication in Coastal Waters

Quantity and quality of particulate organic matter controls bacterial production in the Columbia River estuary

Contact Info

Product

Resources

About