River oxygen uptake and respiratory decay of sewage fungus biofilms

Hickey, Christopher W.

doi:10.1016/0043-1354(88)90093-0

Cited by 11 publications

(4 citation statements)

References 7 publications

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“…Values of respiration rates in downstream sub-reaches of both sites ranged from 1.2 and 84.8 g O 2 .m x2 .d x1 , and are similar to the range of oxygen demand by fungal biofilm measured by Hickey (1988) in an in situ benthic chamber in a stream influenced by human altered water inputs (3 to 70 g O 2 .m x2 .d x1 ). Daily respiration rates, did not change in downstream subreaches affected by the WWTP input at the Monte´gut site, so the punctual input of N, P and fine particular organic matter does not seem to produce an effect on respiration.…”

Section: Discussionmentioning

confidence: 50%

Effects of wastewater treatment plant pollution on in-stream ecosystems functions in an agricultural watershed

Sánchez‐Pérez

Gérino²,

Sauvage³

et al. 2009

Ann. Limnol. - Int. J. Lim.

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-We studied the effect of point-source and non-point-source pollution on the retention capacity of the stream and its link with the metabolic state (primary production and respiration) and invertebrates assemblages in a third order Mediterranean stream. Two experimental sites were chosen: one in the upper part of the catchment (Monte´gut site) characterized by low concentrations in nitrate and phosphate and one in the lower part of the catchment (Le´zat site) characterized by high nitrate and phosphorus concentrations. Both experimental sites were located on reaches that included a Waste Water Treatment Plant (WWTP) point nutrient source allowing discussion of the relative effects of point-source and non-point-source nutrients loads on ecosystem function (respiration and uptake rates) and aquatic organism assemblages. NH 4 + -N, and PO 4 3x -P uptake rates were determined using solute additions conducted at constant rates (short-term nutrient addition procedure) and NO 3x -N uptake rates were determined using instantaneous solute addition (slug addition procedure). Rates of gross primary production (GPP) and ecosystem respiration were determined using the open system, two-stations diurnal oxygen change method. Benthic invertebrate communities were investigated for species and functional feeding groups diversities measurements. Results show that autotrophy in the river results from nutrients of two distinct origins: point sources for phosphorus (urban area and WWTP) and non-point sources for nitrogen (agricultural zones) with local additions from WWTP inputs.Comparison between the two sites shows that the WWTP did not affect uptake rates, respiration or primary production of the ecosystem in the low-nutrient Monte´gut reach despite increase of invertebrates communities biomass density. Inputs from the WWTP, in the high nitrate and phosphate Le´zat reach, increased respiration, lower benthic biomass and led to changes in the species composition and did not affect uptake rates.

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Section: Discussionmentioning

confidence: 50%

Effects of wastewater treatment plant pollution on in-stream ecosystems functions in an agricultural watershed

Sánchez‐Pérez

Gérino²,

Sauvage³

et al. 2009

Ann. Limnol. - Int. J. Lim.

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“…Hickey (1988a), working with sewage fungus biofilms from several rivers, reported an approximately linear relationship between O 2 flux and velocity over the range of 5-25 cm⋅s -1 . In contrast, we found that metabolism was not strongly affected by water velocity when in a lower range.…”

Section: Water Velocity Experimentsmentioning

confidence: 98%

An evaluation of techniques for measuring periphyton metabolism in chambers

Bott¹,

Brock²,

Baatrup-Pedersen³

et al. 1997

Can. J. Fish. Aquat. Sci.

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Experiments were performed to compare 14 C uptake, dissolved O 2 and CO 2 change, and microelectrode techniques for measuring benthic primary productivity and community metabolism at a site on the South Saskatchewan River, Saskatchewan. The highest estimates of primary productivity were obtained with O 2 microelectrodes (two to four times higher than simultaneous estimates from bulk-water dissolved O 2 measurements), presumably because measurements are biased toward active communities under optimal conditions for photosynthesis. In daytime experiments lasting~1.3 and 2.4 h, estimates from 14 C uptake were higher than those measured simultaneously from dissolved O 2 and CO 2 change, suggesting that 14 C uptake measured gross primary production (GPP) in these short-term incubations. Differences in experimental water velocity ranging from 0.2 to >6.5 cm⋅s -1 had less of an effect than chlorophyll a concentration on metabolic rates in diel experiments with rocks taken from a site where velocities were from 5.6 to 7.8 cm⋅s -1 . There was a potential for phosphorus and possibly NH 4 limitation of metabolic activity during long-term incubations. Results highlight areas in which further research is needed when using chambers to determine periphyton metabolism.Résumé : Nos expériences visaient à comparer l'assimilation du 14 C, les changements dans l'O 2 dissous et le CO 2 et les techniques faisant appel à des microélectrodes pour mesurer la productivité primaire benthique et le métabolisme des communautés sur un site de la rivière Saskatchewan sud (Saskatchewan). Ce sont les microélectrodes à O 2 qui ont donné les estimations les plus élevées de la productivité primaire (deux à quatre fois plus élevées que les estimations simultanées des mesures de l'O 2 dissous dans l'eau libre), ce qui est probablement dû au fait que les mesures sont biaisées en faveur des communautés actives dans les conditions idéales de la photosynthèse. Dans des expériences en lumière du jour d'une durée dẽ 1,3 et 2,4 h, les estimations établies à partir de l'assimilation du 14 C étaient plus élevées que celles fournies par les mesures simultanées du changement de l'O 2 dissous et du CO 2 , ce qui permet de penser que l'assimilation du 14 C mesurait la production primaire brute dans ces incubations de courte durée. Les différences dans la vitesse de l'eau pendant les expériences, de l'ordre de 0,2 à >6,5 cm⋅s -1 , avaient moins d'effet que la concentration de chlorophylle a sur le métabolisme dans les expériences diurnes réalisées avec des roches prélevées sur un site où les vitesses étaient de l'ordre de 5,6 à 7,8 cm⋅s -1 . Les incubations de longue durée présentaient un potentiel de limitation du métabolisme du phosphore et peut-être du NH 4 . Les résultats font ressortir les domaines où il est nécessaire de poursuivre les recherches quand on utilise des enceintes pour mesurer le métabolisme du périphyton. [Traduit par la Rédaction]Can.

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“…1979;Murphy & Hicks, 1986;Wu, 1990). Although continuous-flow incubation systems are more difficult to construct and to operate, they have the advantage that the natural environment can be closely simulated within the chambers (Hickey, 1988;Wu, 1990).…”

Section: Introductionmentioning

confidence: 99%

A continuous‐flow system for measuring in vitro oxygen and nitrogen metabolism in separated stream communities

Prahl

Sand‐Jensen

Mothiversen³

1991

Freshwater Biology

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1. This paper describes a continuous-flow system that we have used extensively for measurement of oxygen exchange and nitrogen transformations in different communities of lowland streams, i.e. the water, the sediment, and the macrophyte-biofilm community. The system, which is set up on the stream bank, consists of several macrophyte and sediment chambers equipped with a double-flow system that ensures an internal water velocity close to that in the stream and which, by continuously renewing the water, mimics diel fluctuation in stream temperature and water chemistry. Water temperature and dissolved oxygen are measured continuously and the data stored on magnetic tape. Water samples are collected in a refrigerator and analysed using standard chemical procedures.2. The application of the system is illustrated using results obtained during a 2-day summer experiment in a shallow macrophyte-rich stream. The biological processes in the stream were mainly associated with the macrophyte-biofilm community and the sediment, those in the water being negligible. Oxygen release was confined to the macrophyte-biofilm community, the sediment consuming oxygen both by day and by night. Whole-system gross production and dark respiration occurred at similar rates (6-7g O2 m~" day"'), net balance being about zero. Inorganic nitrogen was consumed both by the sediment and to a greater extent by the macrophytes, the diel average consumption being 1 g N m~^ day^\ 3. The sum of the activity in the macrophyte and sediment chambers corresponded to the overall activity of the stream section as determined by upstream/downstream mass balance. This indicates that the results obtained with the continuous-flow chambers realistically describe the oxygen and the nitrogen metabolism of the stream. " Present address: Chr. Hanscn's Laboratorium Danmark A/S. 10-12,

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River oxygen uptake and respiratory decay of sewage fungus biofilms

Cited by 11 publications

References 7 publications

Effects of wastewater treatment plant pollution on in-stream ecosystems functions in an agricultural watershed

Effects of wastewater treatment plant pollution on in-stream ecosystems functions in an agricultural watershed

An evaluation of techniques for measuring periphyton metabolism in chambers

A continuous‐flow system for measuring in vitro oxygen and nitrogen metabolism in separated stream communities

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