Phosphate-limited growth and uptake kinetics of the marine prasinophyte Tetraselmis suecica (Kylin) Butcher

Laws, Edward A.; Pei, Shaofeng; Bienfang, Paul K.; Grant, Scott

doi:10.1016/j.aquaculture.2011.09.041

Cited by 25 publications

(21 citation statements)

References 30 publications

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“…The ammonium concentrations were consistently above concentrations that would be expected to limit phytoplankton growth [30], and silicate concentrations were consistently above concentrations that would be expected to limit diatom growth [24,31]. Phosphate concentrations that are limiting to phytoplankton growth are on the order of 10 nM [32,33], but the standard assay for molybdate-reactive phosphorus [34] gives a positive response for a large number of dissolved organo-phosphorus compounds [35], and it is therefore likely that the average molybdate-reactive phosphorus concentration of 0.5 µM is an overestimation of the inorganic phosphate concentration in University Lake. To the extent that phytoplankton biomass in the lake is limited by the concentration of a macronutrient, phosphate appears to be the most likely candidate, as is the case in many freshwater systems [36,37].…”

Section: Discussionmentioning

confidence: 99%

Nutrients and Phytoplankton in a Shallow, Hypereutrophic Urban Lake: Prospects for Restoration

Norris

2017

Water

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University Lake, a shallow, artificial, urban lake adjacent to the campus of Louisiana State University, has a long history of water quality problems, including algal blooms, fish kills, and high concentrations of fecal indicator bacteria. Periodic dredging of the lake is necessary to prevent its return to swampland. This study was undertaken to elucidate the roles of allochthonous versus autochthonous nutrients as causes of water quality problems in the lake, with the expectation that this information would help identify strategies for lake restoration. Photosynthetic rates and concentrations of inorganic nutrients and phytoplankton pigments were measured over a period of one year. More than 90% of the chlorophyll a (chl a) in the lake was accounted for by Chlorophyceae, Cyanophyceae, and Bacillariophyceae. Concentrations of chl a, which averaged 75 µg L −1 , fluctuated weekly during dry weather by as much as a factor of four. Phytoplankton growth rates were about 30% higher 1-2 days after rain events than after periods of dry weather, the implication being that allochthonous nutrient loading has a significant effect on the dynamics of the phytoplankton community in the lake. Therefore, dredging of sediments will likely produce no long-term improvement in water quality. More than 100 storm drains currently discharge into the lake, and diversion of those drains may be the most cost-effective strategy for effecting a long-term improvement in water quality.

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Section: Discussionmentioning

confidence: 99%

Nutrients and Phytoplankton in a Shallow, Hypereutrophic Urban Lake: Prospects for Restoration

Norris

2017

Water

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“…μ max is often unobtainable, and in reality is only a fitting parameter for the equation (Droop , Laws et al. ,b, ). Also Q should be the average daily cell quota since quotas for P and other nutrients (e.g., N and Fe) typically vary with time of day due to diel variations in rates of nutrient uptake, cell growth and cell division (Ahn et al.…”

Section: Growth Limitation and Cellular Responses To Itmentioning

confidence: 99%

“…These methods, however, also typically measure some reactive DOP compounds, and may overestimate the true dissolved Pi concentration (Thomson‐Bulldis and Karl , Laws et al. ). Because of this, the Pi measured by these methods is often referred to as soluble reactive phosphorus (SRP) with the knowledge that it likely includes some DOP and other reactive P compounds, especially in low‐Pi oceanic surface waters with high DOP:Pi ratios (Fig.…”

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confidence: 99%

Phosphorus physiological ecology and molecular mechanisms in marine phytoplankton

Lin

Litaker

Sunda

2016

Journal of Phycology

299

269

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Phosphorus (P) is an essential nutrient for marine phytoplankton and indeed all life forms. Current data show that P availability is growth-limiting in certain marine systems and can impact algal species composition. Available P occurs in marine waters as dissolved inorganic phosphate (primarily orthophosphate [Pi]) or as a myriad of dissolved organic phosphorus (DOP) compounds. Despite numerous studies on P physiology and ecology and increasing research on genomics in marine phytoplankton, there have been few attempts to synthesize information from these different disciplines. This paper is aimed to integrate the physiological and molecular information on the acquisition, utilization, and storage of P in marine phytoplankton and the strategies used by these organisms to acclimate and adapt to variations in P availability. Where applicable, we attempt to identify gaps in our current knowledge that warrant further research and examine possible metabolic pathways that might occur in phytoplankton from well-studied bacterial models. Physical and chemical limitations governing cellular P uptake are explored along with physiological and molecular mechanisms to adapt and acclimate to temporally and spatially varying P nutrient regimes. Topics covered include cellular Pi uptake and feedback regulation of uptake systems, enzymatic utilization of DOP, P acquisition by phagotrophy, P-limitation of phytoplankton growth in oceanic and coastal waters, and the role of P-limitation in regulating cell size and toxin levels in phytoplankton. Finally, we examine the role of P and other nutrients in the transition of phytoplankton communities from early succession species (diatoms) to late succession ones (e.g., dinoflagellates and haptophytes).

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“…Molecular methods of measuring the activity of assimilatory enzymes can provide important information about N utilization (Fan et al, 2003;Lomas, 2004), but quantifying N uptake and its conversion into producer biomass still requires monitoring total phytoplankton assimilation (either directly with isotope techniques, or indirectly from ambient N depletion) and producer population densities (Bronk et al, 2007). Typically, species-specific kinetic estimates for per-cell N uptake are calculated by dividing N consumed by cell density at successive points in time, and then fitting a saturating Michaelis-Menten functional response (Laws et al, 2011;Maguer et al, 2007;Tantanasarit et al, 2013). While convenient when analyzing rates of N utilization under constant nutrient regimes, this technique cannot tractably capture the functional relationships that govern important processes, such as interactions between nitrate and ammonium uptake and acclimatization following extended starvation periods.…”

Section: Introductionmentioning

confidence: 99%

An experimentally validated nitrate–ammonium–phytoplankton model including effects of starvation length and ammonium inhibition on nitrate uptake

Malerba

Connolly

Heimann

2015

Ecological Modelling

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Phosphate-limited growth and uptake kinetics of the marine prasinophyte Tetraselmis suecica (Kylin) Butcher

Cited by 25 publications

References 30 publications

Nutrients and Phytoplankton in a Shallow, Hypereutrophic Urban Lake: Prospects for Restoration

Nutrients and Phytoplankton in a Shallow, Hypereutrophic Urban Lake: Prospects for Restoration

Phosphorus physiological ecology and molecular mechanisms in marine phytoplankton

An experimentally validated nitrate–ammonium–phytoplankton model including effects of starvation length and ammonium inhibition on nitrate uptake

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