Periphyton metabolism along a nutrient gradient in a desert river (Truckee River, Nevada, USA)

Uehlinger, Urs; Brock, James T.

doi:10.1007/s00027-005-0788-z

Cited by 15 publications

(11 citation statements)

References 49 publications

(60 reference statements)

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“…For example, Naegeli and Uehlinger (1997) Here we have simply ascribed the consumption of oxygen to respiration, as is common in the literature, whereas it obviously includes the oxidation of methane, ammonia, and other reduced substrates. Our instantaneous rates of GPP (a simple sum of P and R per hour scaled to one day) of 1.2-3.4 g O 2 m 22 d 21 are also comparable to those measured for periphyton growing on artificial tiles (3.3-9.1 g O 2 m 22 d 21 ; Uehlinger and Brock 2005). Clearly, therefore, there is great potential for epilithic primary production on the gravels to add to the already substantial productivity of the Ranunculus spp.…”

Section: Discussionsupporting

confidence: 80%

Potential carbon fixation via methane oxidation in well‐oxygenated river bed gravels

Trimmer

Maanoja

Hildrew

et al. 2009

Limnology & Oceanography

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Due to a combination of local methanogenesis and high background concentrations in the groundwater, water in the River Lambourn is 51 times supersaturated with methane (162 nmol CH 4 L 21 ). Pore-water concentrations of methane in the gravels of the riverbed were much lower throughout the year (71 nmol CH 4 L 21 ), suggesting significant methane oxidation. To investigate the potential for methane oxidation as a novel chemosynthetic source of carbon to the food web, we made simultaneous measurements, in laboratory chambers, of primary production, respiration, and methane oxidation associated with the gravels. Biomass-specific net primary production was up to 2.7 mmol O 2 mg 21 chlorophyll (Chl) h 21 and was similarly high for respiration (2.7 mmol O 2 mg 21 Chl h 21 ). We also found active methane (CH 4 ) oxidation with the rate increasing in proportion to concentration. At the maximum rate of 0.18 mmol CH 4 mg 21 Chl h 21 and a growth efficiency of 0.8, net carbon fixation via methane oxidation was equivalent to 6% of the carbon fixed via net photosynthetic primary production. However, production via methane oxidation could be proportionately much greater under the shade of the profuse instream or riparian vegetation, deep in the gravels, and especially during winter, when light is limiting (, 25 mmol quanta m 22 s 21 ).

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Section: Discussionsupporting

confidence: 80%

Potential carbon fixation via methane oxidation in well‐oxygenated river bed gravels

Trimmer

Maanoja

Hildrew

et al. 2009

Limnology & Oceanography

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“…GPP rates in this study (0 to 8.4 g O 2 m −2 day −1 ) were comparable to rates measured in other streams having varying levels of basin disturbance (Hall 1972;Bott et al 1985;Young and Huryn 1996;Mulholland et al 2001;Uehlinger and Brock 2005) and below some of the values reported for similar prairie/agriculture land use (<0.1 to >50 g O 2 m −2 day −1 , Wiley et al 1990). CR-24 rates generally were greater than those measured in investigations by Hall (1972), Hall and Tank (2003), and Mulholland et al (2001), which ranged from 0.4 to 13 g O 2 m −2 day −1 but were comparable to, and in some cases lower than, rates reported in the literature for similarly disturbed systems (Wiley et al 1990;Houser and Mulholland 2005).…”

Section: Nutrient and Algal Measures As Related To Stream Metabolism supporting

confidence: 83%

“…Past research has shown that physical factors, such as light availability, temperature, and channel/habitat characteristics (Bott et al 1985(Bott et al , 2006Wiley et al 1990;Ortiz-Zayas et al 2005;Uehlinger and Brock 2005), can significantly influence production and respiration.…”

Section: Selected Environmental Variables Related To Stream Metabolismentioning

confidence: 99%

“…Similarly, a small number of studies have analyzed the effect of increasing nitrate concentrations on the efficiency of biotic uptake and denitrification of nitrate, as related to ecosystem photosynthesis and respiration (Peterson et al 2001;Duff et al 2008;Mulholland et al 2008). Some studies of stream metabolism along a nutrient gradient have focused on longitudinal differences in response within a single stream (e.g., Uehlinger and Brock 2005).…”

Section: Introductionmentioning

confidence: 99%

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The relative influence of nutrients and habitat on stream metabolism in agricultural streams

Frankforter

Weyers

Bales

et al. 2009

Environ Monit Assess

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Stream metabolism was measured in 33 streams across a gradient of nutrient concentrations in four agricultural areas of the USA to determine the relative influence of nutrient concentrations and habitat on primary production (GPP) and respiration reach. When data for all study areas were combined, there were no statistically significant relations between gross primary production or community respiration and any of the independent variables. However, significant regression models were developed for three study areas for GPP (r 2 = 0.79-0.91) and CR-24 (r 2 = 0.76-0.77). Various forms of nutrients (total phosphorus and area-weighted total nitrogen loading) were significant for predicting GPP in two study areas, with habitat variables important in seven significant models. Important physical variables included light availability, precipitation, basin area, and in-stream habitat cover. Both benthic and seston chlorophyll were not found to be important explanatory variables in any of the models; however, benthic ash-free dry weight was important in two models for GPP.

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“…Periphytic algae are believed to be the major primary producers in headwater and midregion areas of river systems, but there have been relatively few studies of algal PP in streams on an annual basis (Fuller and Bucher 1991;Uehlenger 2006). Primary productivity in flowing water systems is estimated from oxygen change or carbon dioxide change in open stream (Uehlenger 2006;Bott et al 2006), or is measured in closed chambers placed in laboratory or in situ (Munn and Brusven 2004;Uehlinger and Brock 2005;Reid et al 2006) by 14 C uptake (Ostrofsky et al 1998), or by using O 2 microelectrode (Dodds et al 1999). PP can also be calculated from chlorophyll a (algae biomass) estimations (Fellows et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Estimation of periphytic microalgae gross primary production with DCMU-fluorescence method in Yenisei River (Siberia, Russia)

et al. 2007

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Periphyton (epilithon) gross primary production (GPP) was estimated using the DCMU-fluorescence method in the Yenisei River. In the unshaded littoral zone, chlorophyll a concentration (Chl a) and GPP value varied from 0.83 to 973.74 mg m −2 and 2-304,425 O 2 m −2 day −1 (0.64-95 133 mg C m −2 day −1 ), respectively. Positive significant correlation (r=0.8) between daily GPP and periphyton Chl a was found. Average ratio GPP:Chl a for periphyton was 36.36 mg C mg Chl a m −2 day −1 . The obtained GPP values for the Yenisei River have a high significant correlation with values predicted by a conventional empirical model for stream periphyton. We concluded that the DCMU-fluorescence method can be successfully used for measuring of gross primary production of stream phytoperiphyton at least as another useful tool for such studies.

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Periphyton metabolism along a nutrient gradient in a desert river (Truckee River, Nevada, USA)

Abstract: Abstract. Periphyton metabolism was studied at fi ve sites along a 70 km unshaded stretch of the Truckee

Cited by 15 publications

References 49 publications

Potential carbon fixation via methane oxidation in well‐oxygenated river bed gravels

Potential carbon fixation via methane oxidation in well‐oxygenated river bed gravels

The relative influence of nutrients and habitat on stream metabolism in agricultural streams

Estimation of periphytic microalgae gross primary production with DCMU-fluorescence method in Yenisei River (Siberia, Russia)

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