Contribution of the Hyporheic Zone to Ecosystem Metabolism in a Prealpine Gravel-Bed-River

Naegeli, Markus W.; Uehlinger, Urs

doi:10.2307/1468172

Cited by 176 publications

(171 citation statements)

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“…Cole,2 and Michael L. Pace of benthic and pelagic habitats to this whole (Vadeboncoeur et al 2003). These contributions are sometimes obtained by measuring the metabolism of the whole and one of the parts (using bottles or chambers and their associated uncertainties) and inferring the other component by difference (Naegeli and Uehlinger 1997;Fellows et al 2001;Carpenter et al 2005). However, it is not clear whether free-water techniques actually measure the metabolism of the whole system or some part of it.…”

Section: Introductionmentioning

confidence: 99%

Assessing pelagic and benthic metabolism using free water measurements

Bogert

Carpenter

Cole

et al. 2007

Limnology & Ocean Methods

139

144

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Automated in situ sensors for measuring changes in dissolved oxygen (DO) at high frequency have facilitated estimates of gross primary production (GPP) and respiration (R) in aquatic systems. Lake researchers usually rely on a single sensor for these estimates, but such point measurements may miss important spatial heterogeneity in within-lake processes and may not accurately represent systemwide values of metabolism. Here we combine simultaneous measurements of metabolism using DO sensors along transects from the shore to the center of a lake with a spatial model to better understand the underlying heterogeneity in processes contributing to whole-lake epilimnetic metabolism. We use this model to achieve better estimates of epilimnetic GPP and R and to determine the relative contributions of benthic-littoral vs. pelagic processes to these estimates. We compared the spatially explicit process-based model to estimates of metabolism from both a single sensor at the lake's center and a spatially explicit averaging of multiple sensor sites. Estimates of both GPP and R varied on average 2.5-to 3.2-fold from site to site within the same lake, whereas variations were sometimes as high as 6-to 7-fold. Estimates of GPP and R near the perimeter of lakes were on average greater than measurements in the middle of the lake. Our model estimates that benthic-littoral processes accounted for ~40% of epilimnetic GPP and R. A single, centrally located sensor often misses a significant component of this benthic metabolism and accounts for only ~81% of lakewide GPP and R.

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Section: Introductionmentioning

confidence: 99%

Assessing pelagic and benthic metabolism using free water measurements

Bogert

Carpenter

Cole

et al. 2007

Limnology & Ocean Methods

139

144

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“…The surface of riverbed sediments forms only the visible part of a vast continuous area extending beneath and alongside a river bed known as the hyporheic zone (Orghidan 1955). In this three-dimensional zone, where mixing of water, nutrients and organic matter occurs between the surface and subsurface (Boulton et al 1998), a substantial part of decomposition and nutrient turnover takes place (Naegeli and Uehlinger 1997). Here, the interlinked surface and subsurface processes are complex and multidimensional and are driven mainly by hydrological patterns and the geomorphology of the riverbed and adjacent aquifer (Valett et al 1996;Mermillod-Blondin et al 2000.…”

Section: Introductionmentioning

confidence: 99%

“…Invertebrates that inhabit the interstitial spaces contribute mostly to particulate organic matter processing and the top-down control of microorganisms (Foulquier et al 2010). The heterotrophic respiration of both biofilm and invertebrates is one of the key processes in lotic ecosystems (Naegeli and Uehlinger 1997;Pusch et al 1998) and, as such, is one of the most frequently measured functional ecosystem parameters. Mechanistically, aerobic respiration is the biotic conversion of organic carbon to carbon dioxide (YvonDurocher et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The majority estimate oxygen consumption above the sediment-water interface and do not consider the flow of water through the sediment (e.g. Bowman and Delfino 1980;Jeppesen 1982;Prahl et al 1991;Jones et al 1995;Naegeli and Uehlinger 1997;Doering et al 2011;Ruegg et al 2015;Simčič et al 2015). Pusch and Schwoerbel (1994) have developed a portable device with recirculating water to simulate unidirectional flow of water through a quasi-natural sediment sample, enabling them to measure hyporheic community respiration in the field.…”

Section: Introductionmentioning

confidence: 99%

“…It differs from gravel-sand filter columns (Mermillod-Blondin et al 2005), since the interstitial flow velocities and the incubation temperature can be modified and controlled. Respiration measurements obtained using this newly designed system were compared with an in situ closed chamber system, which is proven as an efficient tool for estimating heterotrophic respiration in stream sediments (Naegeli and Uehlinger 1997;Uehlinger et al 2002;Doering et al 2011). Finally, already known relationship between sediment granulometry and heterotrophic respiration rates (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Testing the influence of sediment granulometry on heterotrophic respiration with a new laboratory flow-through system

et al. 2016

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Purpose Increased sedimentation due to land use intensification is increasingly affecting carbon processing in streams and rivers around the globe. This study describes the design of a laboratory-scale flow-through incubation system as a tool for the rapid estimation of sediment respiration. The measurements were compared with those obtained using an in situ closed chamber respiration method. The influence of sediment size on respiration rates was also investigated. Materials and methods Measurements were conducted on a pre-alpine gravel-bed river sediment separated into the following grain size fractions: > 60 mm (14.3%), 60-5 mm (60.2%), 5-2 mm (13.7%), 2-0.063 mm (11.1%) and <0.063 mm (0.6%). Concurrently, in situ and laboratory measurements were carried out on a naturally heterogeneous sediment. In situ respiration was determined in closed chambers as O 2 consumption over time, while in the laboratory, respiration was determined using flow-through respiration chambers. Oxygen concentrations were measured using a fibre-optic oxygen meter positioned at the inflow and outflow from the chamber. Results and discussion The mean respiration rates within naturally mixed riverbed sediments were 1.27 ± 0.3 mg O 2 dm −3 h −1 (n = 4) and 0.77 ± 0.1 mg O 2 dm −3 h −1 (n = 3) for the flow-through chamber system and closed chamber system, respectively. Respiration rates were statistically significantly higher in the flow-through chamber system (t test, p < 0.05), indicating that closed chamber measurements underestimated the oxygen consumption within riverbed sediments. Sediment grain size was found to significantly affect respiration rates in both systems (ANOVA, p < 0.001) with the fine sediment fraction (particle size <0.063 mm) having the highest respiration rate (r flow-through = 51 ± 23 mg O 2 dm −3 h −1 ). The smallest fractions (2-0.063 and <0.063 mm), which represent approximately 12% of total sediment volume, contributed 60% of total respiration. Conclusions The study demonstrated that flow-through respiration chambers more accurately estimate the respiration rate within riverbed sediments than in situ closed chambers, since the former experiment imitates the natural conditions where continuous interstitial flow occurs in the sediments. We also demonstrated that fine sediments (<5 mm) substantially contribute to heterotrophic respiration in the studied gravel-bed river.

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Biofilms in Natural and Drinking Water Systems

Manz

Szewzyk

Lawrence³

2003

Encyclopedia of Environmental Microbiology

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Biofilm Components Formation and Structure of Biofilms Identification of Biofilm Bacteria Assessment of Metabolic Activities Community Interactions Examples of Natural Biofilms

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Contribution of the Hyporheic Zone to Ecosystem Metabolism in a Prealpine Gravel-Bed-River

Cited by 176 publications

References 30 publications

Assessing pelagic and benthic metabolism using free water measurements

Assessing pelagic and benthic metabolism using free water measurements

Testing the influence of sediment granulometry on heterotrophic respiration with a new laboratory flow-through system

Biofilms in Natural and Drinking Water Systems

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