Ammonium, nitrate and phytoplankton interactions in a freshwater tidal estuarine zone: potential effects of cultural eutrophication

Domingues, Rita B.; Barbosa, Ana B.; Sommer, Ulrich; Galvão, Helena M.

doi:10.1007/s00027-011-0180-0

Cited by 158 publications

(97 citation statements)

References 39 publications

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“…Similar reports of dichotomous use of different forms of N have been frequently reported. Glibert et al (2004) reported the same phenomenon from Florida Bay, as did Domingues et al (2011) for a tidal fresh estuary. Similar observations have been reported from mesocosm experiments variably enriched with different forms of N (e.g.…”

Section: Seasonal Phytoplankton Distributionmentioning

confidence: 53%

Nitrogen dynamics and phytoplankton community structure: the role of organic nutrients

et al. 2017

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Dissolved organic nitrogen (DON) is recognised as an important N source for phytoplankton. However, its relative importance for phytoplankton nutrition and community composition has not been studied comprehensively. This study, conducted in a typical Scottish fjord, representative of nearpristine coastal environments, evaluates the utilisation of DON and dissolved inorganic nitrogen (DIN) by different microbial size fractions and the relationship of phytoplankton community composition with DON and other parameters. The study demonstrated that DON was important in supporting phytoplankton throughout the yearly production cycle. The higherthan-expected urea uptake rates and large fraction of the spring bloom production supported by DON suggested that organic N not only contributes to regenerated production and to the nutrition of the small phytoplankton fraction, but can also contribute substantially to new production of the larger phytoplankton in coastal waters. Multivariate statistical techniques revealed two phytoplankton assemblages with peaks in abundance at different times of the year: a spring group dominated by Skeletonema spp., Thalassiosira spp., and Pseudo-nitzschia spp. group delicatissima; and a summer/autumn group dominated by Chaetoceros spp., Scrippsiella spp., and Pseudonitzschia spp. group seriata. The multivariate pattern in community composition and abundance of these taxa was significantly correlated with the multivariate pattern of DON, urea, dissolved free amino acids, DIN, temperature, salinity, and daylength, with daylength and urea being particularly important, suggesting both physical and chemical controls on community composition.

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Section: Seasonal Phytoplankton Distributionmentioning

confidence: 53%

Nitrogen dynamics and phytoplankton community structure: the role of organic nutrients

et al. 2017

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“…The most common way of adding nutrient is adding a finite supply of dissolved nutrients as the setting concentrations at the beginning of the experiment and adding no more nutrients during the process of phytoplankton incubation (Domingues et al 2011;Ma et al 2015a, b;Paerl et al 2011;Xu et al 2010Xu et al , 2015. However, there are some problems with this approach.…”

Section: Discussionmentioning

confidence: 99%

“…This observation helped explain why the threshold of NH 4 -N was lower than the threshold of NO 3 -N. What is more, the relative preference for ammonium or nitrate is phytoplankton group-specific. In particular, cyanobacteria, chlorophytes, and chrysophytes prefer ammonium, while nitrate is preferred by diatoms, cryptophytes, and dinoflagellates (Chaffin and Bridgeman Domingues et al 2011;Donald et al 2011Donald et al , 2013Ohashi et al 2011). Cyanophytes and chlorophytes account for a very large proportion in Miyun Reservoir in July and August (Fig.…”

Section: Nutrient Thresholds Needed For Controlling Algal Blooms In Tmentioning

confidence: 99%

Critical nutrient thresholds needed to control eutrophication and synergistic interactions between phosphorus and different nitrogen sources

Zeng

Qin

Bao

et al. 2016

Environ Sci Pollut Res

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Eutrophication is one of the greatest threats to global freshwater ecosystems. The phytoplankton responses to nutrient inputs vary in different water bodies, so it is particularly important to determine the nutrient thresholds and synergistic interactions between nutrients in different freshwater ecosystems. Field sampling and bioassay experiments were conducted to determine the thresholds of soluble reactive phosphorus (SRP), nitrate-nitrogen (NO 3 -N), and ammonium-nitrogen (NH 4 -N) in Miyun Reservoir. A separate nutrient addition bioassay was designed to assess the synergistic interactions between these nutrients. Chlorophyll a (Chl a) concentrations were used to estimate phytoplankton biomass. The results showed the following: (1) nutrient threshold bioassay indicated that eutrophication thresholds of SRP, NO 3 -N, and NH 4 -N should be targeted at below 0.04 mg P L −1 , 0.5 mg N L −1 , and 0.3 mg N L −1 , respectively, to limit the growth of phytoplankton. (2) The stimulatory effect of BNH 4 -N plus P^on phytoplankton biomass was greater than (4) Ammonium was an important factor for the growth of phytoplankton and inputs of both NH 4 -N and NO 3 -N should be reduced to control bloom formation. Our findings imply that although P load reduction is important, appropriate reductions of all forms of N in watershed is recommended in the nutrient management strategy for Miyun Reservoir.

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“…This higher uptake is attributed to differences in algal communities that occur in response to the supply of nitrate and ammonium, even at nitrogen concentrations considered saturating for algal growth (Glibert et al 2016 and references therein). Studies have suggested that diatoms thrive in nitrate-rich systems, whereas chlorophytes and cyanobacteria are often associated with ammonium-rich systems (e.g., Blomqvist et al 1994;Hyenstrand et al 1998;Glibert and Berg 2009;McCarthy et al 2009;Domingues et al 2011). Experimental manipulations conducted using algae and water from the Delta reproduced these observations .…”

Section: The Ammonium Paradoxmentioning

confidence: 87%

Nutrient Dynamics of the Delta: Effects on Primary Producers

Dahm¹,

Parker²,

Adelson³

et al. 2016

SFEWS

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Increasing clarity of Delta waters, the emergence of harmful algal blooms, the proliferation of aquatic water weeds, and the altered food web of the Delta have brought nutrient dynamics to the forefront. This paper focuses on the sources of nutrients, the transformation and uptake of nutrients, and the links of nutrients to primary producers. The largest loads of nutrients to the Delta come from the Sacramento River with the San Joaquin River seasonally important, especially in the summer. Nutrient concentrations reflect riverine inputs in winter and internal biological processes during periods of lower flow with internal nitrogen losses within the Delta estimated at approximately 30% annually. Light regime, grazing pressure, and nutrient availability influence rates of primary production at different times and locations within the Delta. The roles of the chemical form of dissolved inorganic nitrogen in growth rates of primary producers in the Delta and the structure of the open-water algal community are currently topics of much interest and considerable debate. Harmful algal blooms have been noted since the late 1990s, and the extent of invasive aquatic macrophytes (both submerged and free-floating forms) has increased especially during years of drought. Elevated nutrient loads must be considered in terms of their ability to support this excess biomass. Modern sensor technology and networks are now deployed that make high-frequency measurements of nitrate, ammonium, and phosphate. Data from such instruments allow a much more detailed assessment of the spatial and temporal dynamics of nutrients. Four fruitful directions for future research include utilizing continuous sensor data to estimate rates of primary production and ecosystem respiration, linking hydrodynamic models of the Delta with the transport and fate of dissolved nutrients, studying nutrient dynamics in various habitat types, and exploring the use of stable isotopes to trace the movement and fate of effluent-derived nutrients.

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Ammonium, nitrate and phytoplankton interactions in a freshwater tidal estuarine zone: potential effects of cultural eutrophication

Cited by 158 publications

References 39 publications

Nitrogen dynamics and phytoplankton community structure: the role of organic nutrients

Nitrogen dynamics and phytoplankton community structure: the role of organic nutrients

Critical nutrient thresholds needed to control eutrophication and synergistic interactions between phosphorus and different nitrogen sources

Nutrient Dynamics of the Delta: Effects on Primary Producers

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