Annual cycle and inter‐annual variability of gross primary production and ecosystem respiration in a floodprone river during a 15‐year period

Uehlinger, Urs

doi:10.1111/j.1365-2427.2006.01551.x

Cited by 143 publications

(177 citation statements)

References 41 publications

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“…Higher flow variability in unregulated rivers also is associated with increased urban land use (Poff et al 2006) and is a major driver of temporal variability in plant biomass and stream metabolism (Uehlinger 2006). However, the effects of flow variability were not completely assessed in our study, and immediate flow effects were avoided by sampling during periods of stable flow.…”

Section: Metabolic Variability As An Indicator Of Landuse Disturbancementioning

confidence: 76%

“…Hence, limited autocorrelation was assumed based on the resetting effects of high-flow events and trends observed in larger rivers (Uehlinger 2006, Dodds et al 2013). To estimate variation at different temporal scales for each site, season was used as the topmost stratum (fixed, with 4 levels: autumn, winter, summer, spring), year was treated as random, and weeks as random nested within seasons.…”

Section: Statistical Analysesmentioning

confidence: 99%

“…The drawback of measuring metabolism for only a short and specific time period is that doing so does not capture the pattern of temporal variation under natural and human-affected condition throughout the year, which may be an important feature of stream ecosystem functioning. Continuous DO monitoring allows estimation of the temporal variation of stream metabolism across seasons and years (e.g., Uehlinger 2006, Roberts et al 2007, which may provide additional information for assessment of stream health.…”

mentioning

confidence: 99%

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Land use affects temporal variation in stream metabolism

Clapcott¹,

Young²,

Neale³

et al. 2016

Freshwater Science

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Stream metabolism (gross primary production and ecosystem respiration) is increasingly used to assess waterway health because mean values are responsive to spatial variation in land use, but little is known about how human land use influences the temporal variability of stream metabolism. We investigated daily variation in dissolved O 2 (DO) concentrations and calculated mean and within-season variation in gross primary production (GPP) and ecosystem respiration (ER) rates at 13 stream sites across a landuse intensity gradient in the Auckland region, New Zealand, over 9 y. Based on generalized linear mixed models, mean daily GPP (0.1-12.6 g O 2 m −2 d ) and seasonal variation in stream metabolism were significantly related to landuse intensity with higher variability associated with higher values of a landuse stress score. Overall, mean daily rates and day-to-day variation in GPP and ER were greatest in summer and least in winter. We recommend summer monitoring over a minimum 5-d period to assess stream health. Our results show that human land use affects the mean and the temporal variability of DO and stream metabolism. This finding has important consequences for characterizing in-stream processes and the resilience of stream ecosystems. Only long-term temporal monitoring provides the data needed to assess fully how streams function.

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Section: Metabolic Variability As An Indicator Of Landuse Disturbancementioning

confidence: 76%

Section: Statistical Analysesmentioning

confidence: 99%

mentioning

confidence: 99%

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Land use affects temporal variation in stream metabolism

Clapcott¹,

Young²,

Neale³

et al. 2016

Freshwater Science

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“…These floods are very important for benthic primary producers in open streams in terms of habitat suitability, biomass and distribution (Biggs, 1996). Floods reduce algal biomass and macroinvertebrate density, in addition to carrying high concentrations of suspended solids that reduce both primary production and ER (Acuña et al, 2004;Uehlinger, 2006;Roberts et al, 2007). In Rambla Salada, the intense rains occurring in December 2003 produced a moderate flood that caused a strong reduction in GPP and ER rates (99% and 97%, respectively), helped by the low temperature and radiation.…”

Section: Seasonal Variation Of Metabolic Ratesmentioning

confidence: 99%

Effects of dilution stress on the functioning of a saline Mediterranean stream

2008

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The effects of seasonality and dilution stress on the functioning of Rambla Salada, a hypersaline Mediterranean stream in SE Spain, were evaluated. The stream is subject to diffuse freshwater inputs from the drainage of intensively irrigated agriculture in the catchment and periodic losses of water through an irrigation channel. Metabolic rates and the biomass of primary producers and consumers were estimated over a 2-year period. During the first year several dilution events occurred, while during the second year the salinity recovery reached predisturbance levels. Functional indicators were compared in the disturbance and recovery salinity periods. Primary production and respiration rates in the Rambla Salada ranged between 0.07-21.05 and 0.19-17.39 g O 2 m -2 day -1 , respectively. The mean values for these variables were 7.35 and 5.48 g O 2 m -2 day -1 , respectively. Mean net daily metabolism rate was 1.87 ± 0.52 g O 2 m -2 day -1 and mean production/respiration ratio was 2.48 ± 1.1, reflecting autotrophic metabolism. The metabolic rates showed the typical seasonal pattern of Mediterranean open canopy streams. Therefore, gross primary production (GPP) and ecosystem respiration (ER) registered maximum values in summer, intermediate values in spring and autumn and minimum values in winter. The metabolic rates and biomass of consumers were greater in the disturbance period than in the recovery period. However, they did not show significant differences between periods due to their important dependence on seasonal cycle. Seasonality accounted for much of the temporal variability in GPP and ER (76% and 83% in the multiregression models, respectively). Light availability seems to be the most important factor for GPP and ER in the Rambla Salada. Autotrophic biomass responded more to variations in discharge and conductivity than to seasonal variations. In fact, it was severely affected by freshwater inputs after which the epipelic biomass decreased significantly and Cladophora glomerata proliferated rapidly. Epipelic algal biomass was the most sensitive parameter to dilution disturbance.

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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). Here, we expand upon these earlier studies to intensively investigate the patterns of metabolism over longer-term scales (i.e., [5 years) in a large, oligotrophic lake that has not experienced directional climate variation (Carey 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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Annual cycle and inter‐annual variability of gross primary production and ecosystem respiration in a floodprone river during a 15‐year period

Cited by 143 publications

References 41 publications

Land use affects temporal variation in stream metabolism

Land use affects temporal variation in stream metabolism

Effects of dilution stress on the functioning of a saline Mediterranean stream

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

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