Multiple Scales of Temporal Variability in Ecosystem Metabolism Rates: Results from 2 Years of Continuous Monitoring in a Forested Headwater Stream

Roberts, Brian J.; Mulholland, Patrick J.; Hill, Walter R.

doi:10.1007/s10021-007-9059-2

Cited by 336 publications

(439 citation statements)

References 66 publications

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“…This hypothesis is supported by the correlation between GPP (b σs and means) and mean monthly water temperature, which was not related to LUS score. The hypothesis is further supported by results of previous studies, for which authors have described a strong relationship between low GPP and low light levels in winter (Roberts et al 2007, Benson et al 2013. For ER, both relative and absolute values of variability differed among seasons.…”

Section: Metabolic Variability As An Indicator Of Landuse Disturbancesupporting

confidence: 82%

“…Stressed study streams probably are subject to even greater variability in metabolic rates at times of episodic storm events. For example, in a 2-y study of a forested headwater stream, episodic storms caused metabolic variability by initially decreasing but then stimulating ER, whereas storms depressed GPP in spring by scouring algae but increased GPP in autumn by clearing coarse benthic organic matter (Roberts et al 2007). Resistance and resilience were not characterized in our study by measuring the temporal responses to pulse disturbances as has been done by others Naegeli 1998, O'Connor et al 2012), but high seasonal variability in stressed streams may reflect eroded resistance and resilience to variation in other environmental controls, e.g., light and nutrients (Biggs et al 1999).…”

Section: Metabolic Variability To Characterize the Stream Environmentmentioning

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.…”

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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 Disturbancesupporting

confidence: 82%

Section: Metabolic Variability To Characterize the Stream Environmentmentioning

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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“…Rates were calculated using the two-station method following Marzolf et al (1994) with the corrections discussed in Young and Huryn (1998), and the onestation calculations following Roberts et al (2007). The two-station method was used for the open reach whenever possible (i.e.…”

Section: Study Sites and Experimental Designmentioning

confidence: 99%

Effects of urban stream burial on organic matter dynamics and reach scale nitrate retention

et al. 2014

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Nitrogen (N) retention in streams is an important ecosystem service that may be affected by the widespread burial of streams in stormwater pipes in urban watersheds. We predicted that stream burial suppresses the capacity of streams to retain nitrate (NO 3 -) by eliminating primary production, reducing respiration rates and organic matter availability, and increasing specific discharge. We tested these predictions by measuring whole-stream NO 3 -removal rates using 15 -retention through a combination of hydrological and biological processes. The channel shape of two of the buried reaches increased specific discharge which enhanced NO 3 -transport from the channel, highlighting the relationship between urban infrastructure and ecosystem function. Uptake lengths in the buried reaches were further lengthened by low stream biological NO 3 -demand, as indicated by NO 3 -uptake velocities 17-fold lower than that of the open reaches. We also observed differences in the periphyton enzyme activity between reaches, indicating that the effects of burial cascade from the microbial to the ecosystem scale. Our results suggest that streamElectronic supplementary material The online version of this article

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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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Multiple Scales of Temporal Variability in Ecosystem Metabolism Rates: Results from 2 Years of Continuous Monitoring in a Forested Headwater Stream

Cited by 336 publications

References 66 publications

Land use affects temporal variation in stream metabolism

Land use affects temporal variation in stream metabolism

Effects of urban stream burial on organic matter dynamics and reach scale nitrate retention

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

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