Temperature Dependence of Inorganic Nitrogen Uptake: Reduced Affinity for Nitrate at Suboptimal Temperatures in Both Algae and Bacteria

Reay, Dave; Nedwell, David B.; Priddle, J.; Ellis‐Evans, J. Cynan

doi:10.1128/aem.65.6.2577-2584.1999

Cited by 171 publications

(95 citation statements)

References 79 publications

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“…Higher performance under temperatures exceeding those typical for their environment has been reported in Southern Ocean and Arctic diatoms (Reay et al 1999;Pančić et al 2015;Schlie and Karsten 2016), illustrating that a direct Fig. 2.…”

Section: Fast Growth and High Temperature Optima For A Polar Speciesmentioning

confidence: 80%

Resilience by diversity: Large intraspecific differences in climate change responses of an Arctic diatom

Wolf

Hoppe

Rost

2017

Limnology & Oceanography

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The potential for adaptation of phytoplankton to future climate is often extrapolated based on single strain responses of a representative species, ignoring variability within and between species. The aim of this study was to approximate the range of strain-specific reaction patterns within an Arctic diatom population, which selection can act upon. In a laboratory experiment, we first incubated natural communities from an Arctic fjord under present and future conditions. In a second step, single strains of the diatom Thalassiosira hyalina were isolated from these selection environments and exposed to a matrix of temperature (38C and 68C) and pCO 2 levels (180 latm, 370 latm, 1000 latm, 1400 latm) to establish reaction norms for growth, production rates, and elemental quotas. The results revealed interactive effects of temperature and pCO 2 as well as wide tolerance ranges. Between strains, however, sensitivities and optima differed greatly. These strain-specific responses corresponded well with their respective selection environments of the previous community incubation. We therefore hypothesize that intraspecific variability and the selection between coexisting strains may pose an underestimated source of species' plasticity. Thus, adaptation of phytoplankton assemblages may also occur by selection within rather than only between species, and species-wide inferences from single strain experiments should be treated with caution.

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Section: Fast Growth and High Temperature Optima For A Polar Speciesmentioning

confidence: 80%

Resilience by diversity: Large intraspecific differences in climate change responses of an Arctic diatom

Wolf

Hoppe

Rost

2017

Limnology & Oceanography

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“…One example for a measured Monod-type kinetics of a technically relevant process is given for Dunaliella tertiolecta at 25 • C. D. tertiolecta shows k NO3 = 1.18 mg/L (19.1 µM) for nitrate and k NH3 = 0.45 mg/L (25 µM) for ammonium associated with maximum specific growth rates of 1.87 day −1 and 1.63 day −1 , respectively [58]. In waste water processes, typically higher values are reported.…”

Section: Nutrient Uptakementioning

confidence: 99%

Microalgal kinetics — a guideline for photobioreactor design and process development

Schediwy

Trautmann

Steinweg

et al. 2019

Engineering in Life Sciences

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Kinetics generally describes bio‐(chemical) reaction rates in dependence on substrate concentrations. Kinetics for microalgae is often adapted from heterotrophs and lacks mechanistic foundation, e.g. for light harvesting. Using and understanding kinetic equations as the representation of intracellular mechanisms is essential for reasonable comparisons and simulations of growth behavior. Summarizing growth kinetics in one equation does not yield reliable models. Piecewise linear or rational functions may mimic photosynthesis irradiance response curves, but fail to represent the mechanisms. Our modeling approach for photoautotrophic growth comprises physical and kinetic modules with mechanistic foundation extracted from the literature. Splitting the light submodel into the modules for light distribution, light absorption, and photosynthetic sugar production with independent parameters allows the transfer of kinetics between different reactor designs. The consecutive anabolism depends among others on nutrient concentrations. The nutrient uptake kinetics largely impacts carbon partitioning in the reviewed stoichiometry range of cellular constituents. Consecutive metabolic steps mask each other and demand a maximum value understandable as the minimum principle of growth. These fundamental modules need to be clearly distinguished, but may be modified or extended based on process conditions and progress in research. First, discussion of kinetics helps to understand the physiological situation, for which ranges of parameter values are given. Second, kinetics should be used for photobioreactor design, but also for gassing and nutrient optimization. Numerous examples are given for both aspects. Finally, measuring kinetics more comprehensively and precisely will help in improved process development.

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“…Salmon-derived N uptake by epilithon increased with temperature and decreased with the proportion of the catchment harvested of timber. Increased water temperature can stimulate epilithon metabolism, which in turn increases N assimilation (Reay et al, 1999) and thus demand for salmon-derived N. Timber harvest could have decreased N enrichment of epilithon through altered stream geomorphology, especially reduced sediment size (Platts et al, 1989), which increases susceptibility to spawner-mediated disturbance (Tiegs et al, 2008). Although sediment size has negatively predicted the absolute value of epilithon d 15 N during a salmon run (cf.…”

Section: Environmental Controls On Utilisation Of Salmon-derived Matementioning

confidence: 99%

Effects of spawning Pacific salmon on the isotopic composition of biota differ among southeast Alaska streams

et al. 2013

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1. Adult Pacific salmon (Oncorhynchus spp.) transport marine nutrients to fresh waters and disturb sediments during spawning. The relative importance of nutrient fertilisation and benthic disturbance by salmon spawners can be modulated by environmental conditions (e.g. biological, chemical and physical conditions in the catchment, including human land use). 2. To determine the importance of the environmental context in modifying the uptake and incorporation of salmon-derived material into stream biota, we measured the nitrogen (d 15 N) and carbon (d 13 C) isotopic composition of benthic algae (i.e. epilithon) and juvenile coho salmon (Oncorhynchus kisutch) in seven streams across a timber-harvest gradient (8-69% catchment area harvested), both before and during the salmon run. Conditional bootstrap modelling simulations were used to assess variability in the response of epilithon and juvenile coho salmon to spawning salmon. 3. In response to spawning salmon, epilithon exhibited enrichment in both d 15 N (mean: 1.5&) and d 13 C (2.3&). Juvenile coho were also enriched in both d 15 N (0.7&) and d 13 C (1.4&). Conditional bootstrap models indicate decreased variation in data as spatial replication increases, suggesting that the number of study sites can influence the results of Pacific salmon isotope studies. 4. Epilithon isotopic enrichment was predicted by environmental conditions, with d 15 N enrichment predicted by stream temperature and timber harvest (R 2 = 0.87) and d 13 C enrichment by discharge, sediment size, timber harvest and spawner density (R 2 = 0.96). Furthermore, we found evidence for a legacy effect of salmon spawners, with pre-spawner d 15 N and d 13 C of both epilithon and juvenile coho predicted by salmon run size in the previous year. 5. Our results show that the degree of incorporation of salmon-derived nitrogen and carbon differs among streams. Furthermore, the environmental context, including putative legacy effects of spawning salmon, can influence background isotopic concentrations and utilisation of salmonderived materials in southeast Alaska salmon streams. Future studies should consider the variation in isotopic composition of stream biota when deciding on the number of study sites and samples needed to generate meaningful results.

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Temperature Dependence of Inorganic Nitrogen Uptake: Reduced Affinity for Nitrate at Suboptimal Temperatures in Both Algae and Bacteria

Cited by 171 publications

References 79 publications

Resilience by diversity: Large intraspecific differences in climate change responses of an Arctic diatom

Resilience by diversity: Large intraspecific differences in climate change responses of an Arctic diatom

Microalgal kinetics — a guideline for photobioreactor design and process development

Effects of spawning Pacific salmon on the isotopic composition of biota differ among southeast Alaska streams

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