Effectiveness of submersed angiosperm-epiphyte complexes on exchange of nutrients and organic carbon in littoral systems. I. Inorganic nutrients

Mickle, Ann M.; Wetzel, Robert G.

doi:10.1016/0304-3770(78)90028-1

Cited by 47 publications

(12 citation statements)

References 19 publications

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“…Similar estimates of net efflux and independently determined J NH 3 indicate the former was not likely underestimated. Other possible factors include: (1) the high ratio of nitrate to ammonium might preclude preferential ammonium uptake (Mickle & Wetzel, 1978) and (2) the predominance of ammonium uptake from deeper sediments by rooted submersed macrophytes (Barko et al, 1991).…”

Section: Discussionmentioning

confidence: 99%

Contribution of sediment fluxes and transformations to the summer nitrogen budget of an Upper Mississippi River backwater system

James

Richardson²,

Søballe

2007

Hydrobiologia

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Routing nitrate through backwaters of regulated floodplain rivers to increase retention could decrease loading to nitrogen (N)-sensitive coastal regions. Sediment core determinations of N flux were combined with inflow-outflow fluxes to develop mass balance approximations of N uptake and transformations in a flow-controlled backwater of the Upper Mississippi River (USA). Inflow was the dominant nitrate source ([95%) versus nitrification and varied as a function of source water concentration since flow was constant. Nitrate uptake length increased linearly, while uptake velocity decreased linearly, with increasing inflow concentration to 2 mg l -1 , indicating limitation of N uptake by loading. N saturation at higher inflow concentration coincided with maximum uptake capacity, 40% uptake efficiency, and an uptake length 2 times greater than the length of the backwater. Nitrate diffusion and denitrification in sediment accounted for 27% of the backwater nitrate retention, indicating that assimilation by other biota or denitrification on other substrates were the dominant uptake mechanisms. Ammonium export from the backwater was driven by diffusive efflux from the sediment. Ammonium increased from near zero at the inflow to a maximum mid-lake, then declined slightly toward the outflow due to uptake during transport. Ammonium export was small compared to nitrate retention.

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Section: Discussionmentioning

confidence: 99%

Contribution of sediment fluxes and transformations to the summer nitrogen budget of an Upper Mississippi River backwater system

James

Richardson²,

Søballe

2007

Hydrobiologia

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“…An important question about the role of macrophytes in lakes is the extent to which macrophytes act as a source or sink from nutrients. Ozimek et al, (1990), concluded that macrophytes always act as sinks of dissolved N (Mickle & Wetzel, 1978;Howard Williams, 1981). For dissolved P, they may act as a sink (Rattray et al, 1991), mainly in spring when they store large quantities of nutrients (Boyd, 1971), but sometimes as a source (late summer : Prentsky, et al, 1978;Landers, 1982).…”

Section: Discussionmentioning

confidence: 99%

Impact of a nuclear power plant on water quality of Embalse del Río Tercero Reservoir, (Córdoba, Argentina)

et al. 1992

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We studied the water quality of Embalse del Rio Tercero Reservoir after the building of a nuclear power plant, completed in 1983, and compare the results with available information for the period before the plant started operating. At present, the reservoir is eutrophic. It has a period of stratification in spring and summer and it is fully mixed in fall and winter. Seasonal variations are large. Diatoms are dominant during homothermous periods, while primary production seems to be light-limited. Aphanocapsa sp. is dominant during periods of stratification, at the end of which nutrient exhaustion (specially inorganic nitrogen) limits production. At present, mean inorganic nitrogen, total phosphorus and chlorophyll concentrations are lower than before the power plant started operating. It is suggested that this improvement in water quality is due to a change in water management. Extensive drawdown of the reservoir was allowed before 1983. Since large volumes of water are required for cooling purposes in the nuclear power plant, water level fluctuations have strongly diminished. Changes of colonization in Elodea sp. and fish composition have also been observed.

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“…An important question about the role of macrophytes in lakes is the extent to which macrophytes beds act as source or sink for a nutrient. Generally, macrophyte stands always act as sink for dissolved N (Mickle & Wetzel, 1978;Howard-Williams, 1981); as regards dissolved P, the macrophytes may act as a sink usually in spring but also sometimes as a source usually in summer (Prentki et al, 1978;Landers, 1982). In Lake Zwemlust in summers of 1988 and 1989 dense stands ofmacrophytes acted as sink for both N and P. Our bioassay experiments supported N limitation by plants in the lake; this may explain inhibition of phytoplankton and periphyton growth (see e.g.…”

Section: Discussionmentioning

confidence: 99%

Can macrophytes be useful in biomanipulation of lakes? The Lake Zwemlust example

Ozimek

Gulati

Donk³

1990

Biomanipulation Tool for Water Management

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Lake Zwemlust (area 1.5 ha, Z m 1.5 m) has been the object of an extensive limnological study since its biomanipulation involving removal of planktivorous fish (bream) in March 1987 and emptying of the lake. In the subsequent summer period of 1987 the Secchi depth increased to the lake bottom (2.5 m), compared with ca 30 cm in the earlier summers. The reaction of submerged macrophytes to improving under-water light climate was rapid. In summer 1987, besides the introduced Chara globularis, 5 species of submerged macrophytes occurred and colonized 10~o of the lake area. In 1988 and 1989 only quantitative changes were observed; new species did not appear, but the area colonized by macrophytes increased by 7 and 10 times, respectively. Elodea nuttallii was dominant among the macrophytes and Mougeotia sp. among the filamentous green algae. Their abundance, contributed to transient N-limination of phytoplankton causing a persistent clear water phase in 1988 and 1989, unlike in 1987 when zooplankton grazing contributed chiefly to the water clarity. Laboratory bioassays on macrophytes confirmed nitrogen limitation.

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Effectiveness of submersed angiosperm-epiphyte complexes on exchange of nutrients and organic carbon in littoral systems. I. Inorganic nutrients

Cited by 47 publications

References 19 publications

Contribution of sediment fluxes and transformations to the summer nitrogen budget of an Upper Mississippi River backwater system

Contribution of sediment fluxes and transformations to the summer nitrogen budget of an Upper Mississippi River backwater system

Impact of a nuclear power plant on water quality of Embalse del Río Tercero Reservoir, (Córdoba, Argentina)

Can macrophytes be useful in biomanipulation of lakes? The Lake Zwemlust example

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