Planktonic production and respiration in oligotrophic Shield lakes

Carignan, Richard; Planas, Dolors; Vis, Chantal

doi:10.4319/lo.2000.45.1.0189

Cited by 180 publications

(158 citation statements)

References 37 publications

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“…[36] The increase in allochthonous DOC inputs associated with wood harvesting (observed here and also reported by Carignan et al [2000b]) resulted in a decrease in light penetration depth (Table 1) which, in turn, likely inhibited hypolimnetic photosynthesis [Karlsson et al, 2009]). In our study, hypolimnetic photosynthesis occurred only in natural lakes owing to the greater light penetration depths resulting from the lower DOC concentrations (Figure 3a, empty circles; Table 1).…”

Section: Sources Of Ommentioning

confidence: 99%

Assessing carbon dynamics in natural and perturbed boreal aquatic systems

et al. 2012

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[1] Most natural freshwater lakes are net greenhouse gas (GHG) emitters. Compared to natural systems, human perturbations such as watershed wood harvesting and long-term reservoir impoundment lead to profound alterations of biogeochemical processes involved in the aquatic cycle of carbon (C). We exploited these anthropogenic alterations to describe the C dynamics in five lakes and two reservoirs from the boreal forest through the analysis of dissolved carbon dioxide (CO 2 ), methane (CH 4 ), oxygen (O 2 ), and organic carbon (DOC), as well as total nitrogen and phosphorus. Dissolved and particulate organic matter, forest soil/litter and leachates, as well as dissolved inorganic carbon were analyzed for elemental and stable isotopic compositions (atomic C:N ratios, d 13 C org , d 13 C inorg and d 15 N tot ). We found links between the export of terrestrial organic matter (OM) to these systems and the dissolved CO 2 and O 2 concentrations in the water column, as well as CO 2 fluxes to the atmosphere. All systems were GHG emitters, with greater emissions measured for systems with larger inputs of terrestrial OM. The differences in CO 2 concentrations and fluxes appear controlled by bacterial activity in the water column and the sediment. Although we clearly observed differences in the aquatic C cycle between natural and perturbed systems, more work on a larger number of water bodies and encompassing all four seasons should be undertaken to better understand the controls, rates, and spatial as well as temporal variability of GHG emissions, and to make quantitatively meaningful comparisons of GHG emissions (and other key variables) from natural and perturbed systems.

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Section: Sources Of Ommentioning

confidence: 99%

Assessing carbon dynamics in natural and perturbed boreal aquatic systems

et al. 2012

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“…To date, most lake metabolism studies using these techniques have focused on temporal variation based on measurements made in the epilimnion and restricted to one year time periods (e.g., Carignan et al 2000;Sadro et al 2011;Klug et al 2012;Solomon et al 2013;Morales-Pineda et al 2014), in part because the deployment of high-frequency sensors is a recent phenomenon (Weathers et al 2013). In the few studies when metabolism was estimated across multiple years in lakes, rivers, or estuaries, metabolic rates were linked to anthropogenic nutrient loading (Uehlinger 2006) and climatic variation (Roberts et al 2007;Staehr and Sand-Jensen 2007;Einola et al 2011;Laas et al 2012;Caffrey et al 2014;Roley et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Intra- and inter-annual variability in metabolism in an oligotrophic lake

et al. 2016

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Lakes are sentinels of change in the landscapes in which they are located. Changes in lake function are reflected in whole-system metabolism, which integrates ecosystem processes across spatial and temporal scales. Recent improvements in high-frequency open-water metabolism modeling techniques have enabled estimation of rates of gross primary production (GPP), respiration (R), and net ecosystem production (NEP) at high temporal resolution. However, few studies have examined metabolic rates over daily to multi-year temporal scales, especially in oligotrophic ecosystems. Here, we modified a metabolism modeling technique to reveal substantial intra-and interannual variability in metabolic rates in Lake Sunapee, a temperate, oligotrophic lake in New Hampshire, USA. Annual GPP and R increased each summer, paralleling increases in littoral, but not pelagic, total phosphorus concentrations. Storms temporarily decoupled GPP and R, resulting in greater decreases in GPP than R. Daily rates of GPP and R were positively correlated on warm days that had stable water columns, and metabolism model fits were best on warm, sunny days, indicating the importance of lake physics when evaluating metabolic rates. These metabolism data span a range of temporal scales and together suggest that Lake Sunapee may be moving toward mesotrophy. We suggest that functional, integrative metrics, such as metabolic rates, are useful indicators and sentinels of ecosystem change. We also highlight the challenges and opportunities of using high-frequency measurements to elucidate the drivers and consequences of intra-and inter-annual variability in metabolic rates, especially in oligotrophic lakes.

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“…Increasing productivity should increase ␦ 13 C-DIC, whereas increasing respiration should decrease ␦ 13 C-DIC. Similarly, ␦ 13 C-DIC should be related to those factors controlling productivity and respiration in lakes, such as total phosphorus (TP) and dissolved organic carbon (DOC) (Carignan et al 2000;Prairie et al 2002;Hanson et al 2003).…”

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confidence: 99%

Controls of δ¹³C‐DIC in lakes: Geochemistry, lake metabolism, and morphometry

Bade

Carpenter

Cole

et al. 2004

Limnology & Oceanography

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We investigated ␦ 13 carbon (C)-dissolved inorganic carbon (DIC) values in 72 lakes from diverse regions using literature data as well as new measurements for 32 lakes. ␦ 13 C-DIC varied broadly among lakes from Ϫ31 to ϩ2.6‰. This variation of surface-water ␦ 13 C-DIC among lakes is greater than the seasonal variation within most lakes. Several statistical models account for a large portion of the interlake variation and indicate that geochemical (e.g., DIC, pH, alkalinity) and morphometric (area) variables are important, whereas biological (e.g., gross primary productivity [GPP], respiration [R], chlorophyll a) variables are generally not significant. A process-based model including gas exchange with the atmosphere, inorganic carbon speciation, and ecosystem metabolism was also constructed. The model provides a reasonable fit to the data for lakes, in which respiration exceeded GPP (heterotrophic lakes; 75% of lakes sampled). Lakes for which GPP exceeded respiration (autotrophic) were not fit well by the process-based model. The data and models indicate that metabolism creates substantial variation in ␦ 13 C-DIC around the potential ␦ 13 C-DIC that is set by geochemical factors of the watershed.Stable isotope analysis of dissolved inorganic carbon (DIC) has become an important tool for understanding the movement and fate of carbon (C) in lake ecosystems. Several studies have used DIC stable isotopes to understand the carbon cycle of individual lakes by tracking change in the isotope signature through time (Quay et al. 1986;Herczeg 1987;Stiller and Nissenbaum 1999). Few studies have examined ␦ 13 C-DIC for a broad range of lakes to determine the causes and importance of the variation among lakes. Early reports suggested that the possible range of ␦ 13 C-DIC values could be between Ϫ21‰ and 0‰ (Degens 1969). Striegl et al. (2001) compared DIC isotope signatures of 142 lakes during ice cover and concluded that lakes with higher partial pressure of CO 2 (pCO 2 ) had lower ␦ 13 C-DIC values as a result of the dominance of respiration of terrestrial organic material.The ratio of 13 C to 12 C in DIC is influenced by several major processes that alter the input or output of either isotope. Inputs include atmospheric CO 2 , respiration of organic

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Planktonic production and respiration in oligotrophic Shield lakes

Cited by 180 publications

References 37 publications

Assessing carbon dynamics in natural and perturbed boreal aquatic systems

Assessing carbon dynamics in natural and perturbed boreal aquatic systems

Intra- and inter-annual variability in metabolism in an oligotrophic lake

Controls of δ¹³C‐DIC in lakes: Geochemistry, lake metabolism, and morphometry

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Planktonic production and respiration in oligotrophic Shield lakes

Cited by 180 publications

References 37 publications

Assessing carbon dynamics in natural and perturbed boreal aquatic systems

Assessing carbon dynamics in natural and perturbed boreal aquatic systems

Intra- and inter-annual variability in metabolism in an oligotrophic lake

Controls of δ13C‐DIC in lakes: Geochemistry, lake metabolism, and morphometry

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Controls of δ¹³C‐DIC in lakes: Geochemistry, lake metabolism, and morphometry