Decadal regulation of phytoplankton abundance and water clarity in a large continental reservoir by climatic, hydrologic and trophic processes

Vogt, Richard J.; Sharma, Sapna; Leavitt, Peter R.

doi:10.1016/j.jglr.2014.11.007

Cited by 27 publications

(10 citation statements)

References 88 publications

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“…Consistent with this idea, we note that addition of organic N (as urea) to mesocosm experiments in Wascana Lake increased respiration and decreased pH corresponding with CO 2 efflux (Bogard et al, ). Finally, we infer that the negative correlation between high TDN and pH does not reflect a change in the nutrient limitation status of the lakes, as only Diefenbaker and to a lesser extent Buffalo Pound show evidence of P limitation (Quiñones‐Rivera et al, ; Vogt et al, ) and these sites generally exhibit low TDN values relative to other, more definitively N‐limited systems (Leavitt et al, ; Patoine et al, ).…”

Section: Discussionmentioning

confidence: 80%

Generalized Additive Models of Climatic and Metabolic Controls of Subannual Variation in pCO₂ in Productive Hardwater Lakes

et al. 2018

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Spatiotemporal variation in climate and weather, allochthonous carbon loads, and autochthonous factors such as lake metabolism (photosynthesis and respiration) interacts to regulate atmospheric CO2 exchange of lakes. Understanding this interplay in diverse basin types at different timescales is required to adequately place lakes into the global carbon cycle and predict CO2 flux through space and time. We analyzed 18 years of data from seven moderately hard lakes in an agricultural prairie landscape in central Canada. We applied generalized additive models and sensitivity analyses to evaluate the roles of metabolic and climatic drivers in regulating CO2 flux at the intra‐annual scale. At mean conditions with respect to other predictors, metabolic controls resulted in uptake of atmospheric CO2 when surface waters exhibited moderate primary production but released CO2 only when primary production was very low (<8 μg/L or when dissolved nitrogen was elevated (>2,000 μg/L), implying that respiratory controls offset photosynthetic CO2 uptake under these conditions. Climatically, dry conditions increased the likelihood of in‐gassing, likely due to evaporative concentration of base cations and/or reduced allochthonous carbon loads. While more research is required to establish the relative importance of climate and metabolism at other timescales (diel, autumn/winter), we conclude that these hard fresh waters characteristic of continental interiors are mainly affected by metabolic drivers of pCO2 at daily‐monthly timescales, are climatically controlled at interannual intervals, and are more likely to in‐gas CO2 for a given level of algal abundance than are soft water, boreal ecosystems.

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Section: Discussionmentioning

confidence: 80%

Generalized Additive Models of Climatic and Metabolic Controls of Subannual Variation in pCO₂ in Productive Hardwater Lakes

et al. 2018

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“…; Vogt et al . ). To check whether these models also represented the most parsimonious set of variables, we used a second forward selection procedure with a stopping criterion based on AIC (Akaike's information criterion), wherein new variables had to both increase explained variation and reduce model AIC.…”

Section: Methodsmentioning

confidence: 97%

“…Specifically, we used forward selection multiple regression to identify subsets of predictor variables for each phytoplankton response using R 2 adj as a stopping criterion. To enter the model, variables had to be both significant predictors (a < 0.05), and had to increase the R 2 adj relative to the global model (see Blanchet et al 2008;Vogt et al 2015). To check whether these models also represented the most parsimonious set of variables, we used a second forward selection procedure with a stopping criterion based on AIC (Akaike's information criterion), wherein new variables had to both increase explained variation and reduce model AIC.…”

Section: Statistical Analysesmentioning

confidence: 99%

Surface water CO₂ concentration influences phytoplankton production but not community composition across boreal lakes

et al. 2017

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Recent experimental evidence suggests that changes in the partial pressure of CO (pCO ), in concert with nutrient fertilisation, may result in increased primary production and shifted phytoplankton community composition that favours species lacking adaptations to low CO environments. It is not clear whether these results apply in ambient freshwaters, which are already often supersaturated in CO , and where phytoplankton structure and activity are under complex control of diverse local and regional factors. Here, we use a large-scale comparative study of 69 boreal lakes to explore the influence of existing CO gradients (c. 50-2300 μatm) on phytoplankton community composition and biomass production. While community composition did not respond to pCO gradients, gross primary production was enhanced, but only in lakes already supersaturated in CO , demonstrating that environmental context is key in determining pCO -phytoplankton interactions. We further argue that increased atmospheric CO is unlikely to influence phytoplanktonic composition and production in northern lakes.

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“…These changes were observable not only in terms of quantity, but also the pattern, frequency, and the distribution of high and low values. It is expected that the hydrologic regime of LD will be changed due to warming climate (Pomeroy et al 2009;Vogt et al 2015;Hudson and Vandergucht 2015). The extended trend from 1937 to 2014 is more suggestive of decreasing trend, also supported by other studies (Pomeroy et al 2005;St.…”

Section: Discussionmentioning

confidence: 52%

Change in nutrient loading pattern due to coupled effect of change in concentration and hydroclimatic forces

Shafiei

McLoughlin

2017

Journal of Freshwater Ecology

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Increase in nutrient loading into large riverine systems is of interest because of long-lasting negative effects on downstream water bodies. We know little of this phenomenon with respect to long-term relationships between water quality metrics and trends in river flow. Here we present a multi-decadal examination of nutrient transport patterns of the South Saskatchewan and Red Deer Rivers, Canada. Using a multimethod approach, we show a slightly increasing trend in annual volume of water reaching a mid-watershed reservoir (Lake Diefenbaker) concomitant with a change in seasonal variability of flow events from the 1970s. Both total nitrogen (TN) and total phosphorus (TP) flux increased during the period of record. TN concentration increased, while TP concentration decreased. On average, the high-flow season transported 95% of annual TP flux, 75% of annual TN flux, and 65% of annual flow. Inter-annually, high-flow season contributions decreased with respect to water volume, but increased with respect to both TN and TP flux. We believe that changes in variability but also timing of hydroclimatic forces are responsible for observed patterns. Higher flows and more precipitation during the high-flow season are most likely responsible for increasing nutrient load regardless of overall decreases in nutrient concentration.

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Decadal regulation of phytoplankton abundance and water clarity in a large continental reservoir by climatic, hydrologic and trophic processes

Cited by 27 publications

References 88 publications

Generalized Additive Models of Climatic and Metabolic Controls of Subannual Variation in pCO₂ in Productive Hardwater Lakes

Generalized Additive Models of Climatic and Metabolic Controls of Subannual Variation in pCO₂ in Productive Hardwater Lakes

Surface water CO₂ concentration influences phytoplankton production but not community composition across boreal lakes

Change in nutrient loading pattern due to coupled effect of change in concentration and hydroclimatic forces

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Decadal regulation of phytoplankton abundance and water clarity in a large continental reservoir by climatic, hydrologic and trophic processes

Cited by 27 publications

References 88 publications

Generalized Additive Models of Climatic and Metabolic Controls of Subannual Variation in pCO2 in Productive Hardwater Lakes

Generalized Additive Models of Climatic and Metabolic Controls of Subannual Variation in pCO2 in Productive Hardwater Lakes

Surface water CO2 concentration influences phytoplankton production but not community composition across boreal lakes

Change in nutrient loading pattern due to coupled effect of change in concentration and hydroclimatic forces

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Generalized Additive Models of Climatic and Metabolic Controls of Subannual Variation in pCO₂ in Productive Hardwater Lakes

Generalized Additive Models of Climatic and Metabolic Controls of Subannual Variation in pCO₂ in Productive Hardwater Lakes

Surface water CO₂ concentration influences phytoplankton production but not community composition across boreal lakes