Role of oligochaetes in the circulation of water and solutes across the mud-water interface

Wood, Lindsay

doi:10.1080/03680770.1974.11896215

Cited by 14 publications

(12 citation statements)

References 2 publications

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“…They believed that changes in sediment porosity were responsible for a n increased diffusion of chloride tracer in sediment containing T. tubifex (100000 m-2). Wood (1975), however, attributed an increased diffusion of rhodamine B into sediment to irrigation by tubificid worms. Increased porosity and/or diffusivity results in a deeper penetration by oxygen (Davis 1974, Fukuhara 1987 and NO,-, but the transport of reduced material to the sediment surface and the accumulation of organically enriched fecal pellets can result in increased rates of oxygen and NO3-utilization.…”

Section: Discussionmentioning

confidence: 99%

Effects of Tubifex tubifex (Oligochaeta: Tubificidae) on N-mineralization in freshwater sediments, measured with 15N isotopes

Sp¹,

Th²

1995

Aquat. Microb. Ecol.

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Sediment cores conta~ning different dens~ties of Tubifex tublfex ranging from 0 to 70000 ind m-' were incubated in the laboratory Rates of O2 and N O , uptake NH,' production n~tr~fication and denitnfication were determined from sediment-water fluxes Pore water NH,+was measured at the end of the expenment At natural densities -50000 ind m ', there were increased rates of O2 consumption (x2), denitnfication of water phase NO; (x3) and NH,' efflux (x26) Nitrification was stimulated at low worm densities, but inhibited at higher worm densities The transport of reduced compounds and organic matter, with the fecal pellets, to the sediment surface stimulated anoxic cond~tions in the inhabited microcosms These anoxlc cond~tions led to increased rates of denitnfication and were responsible for the decrease in nitnfication at h~g h e r worm densities Approximately 25% of the NO? produced by nitnfication within the sedlment was subsequently den~trlfied Denitnfication was responslble for 25% of the NO, disappearance from the system The h~g h e r rates of denitrification were counterbalanced by higher rates of NH,' flux from the sediment It is likely however that the presence of T tubifex resulted in a net loss of nitrogen that could otherwise have been used by the primary producers KEY WORDS Bioturbation . Nitrification Denitnfication S e d~m e n t s

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Section: Discussionmentioning

confidence: 99%

Effects of Tubifex tubifex (Oligochaeta: Tubificidae) on N-mineralization in freshwater sediments, measured with 15N isotopes

Sp¹,

Th²

1995

Aquat. Microb. Ecol.

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“…Its activity changes the physicalchemical parameters of sediments (Meadows & Tait, 1989;Jones & Jago, 1992) and extends the contact surface between water and sediments (Svensson & Leonardson, 1996). It also increases water dynamics in the near-bottom zone (Wood, 1975), thus influencing oxygen level (Svensson & Leonardson, 1996), which in turn determines processes occurring within the sediments and substance exchange across the water-sediment interface (Bostrom et al, 1988;Marsden, 1989;Sweerts, 1990). Moreover, these factors affect biodiversity, quantity and metabolic activity of microorganisms living in sediments (Krantzberg, 1985;van de Bund et al, 1994).…”

Section: Introductionmentioning

confidence: 97%

Factors influencing taxonomic composition and abundance of macrozoobenthos in extralittoral zone of shallow eutrophic lakes

Żbikowski

Kobak

2007

Hydrobiologia

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“…This strategy keeps the worms' food supply continuously renewed and unpolluted by recently digested material (Alsterberg 1925, Brinkhurst et al 1972. It has been shown that oligochaetes transport overlying water to deeper sediment layers (Wood 1975) but they do not, however, ventilate their constructions to the same extent as chironomids (Leuchs 1986). On the other hand, oligochaetes have a higher capacity to redistribute particles compared to chironomids (Alsterberg 1925.…”

Section: Introductionmentioning

confidence: 99%

Nitrification and dentrification in a eutrophic lake sediment bioturbated by oligochaetes

Svensson

Enrich‐Prast²,

Leonardson³

2001

Aquat. Microb. Ecol.

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The influence on nitrification and denitrification of oligochaete Limnodrilus sp. and Tubifex tubifex bioturbation was determined in eutrophic lake sediment from the Basin of Lake Ringsjön in southern Sweden. Nitrification and denitrification activity was compared in sieved and in undisturbed sediment cores in laboratory mesocosms at 2 different concentrations of nitrate. Nitrification and total denitrification rates were positively correlated to oligochaete biomass between 0 and 4 g dry weight m -2 at both 33 and 268 µM nitrate in the inflowing water. Denitrification (d w ) was relatively more stimulated by the oligochaetes at high concentrations of nitrate in the overlying water than at low nitrate concentrations. Though nitrification was enhanced by oligochaetes, this tended to reach a maximum between 3 and 5 g of oligochaete dry weight m -2. Comparison of the enhancement of denitrification by oligochaetes with other similar studies of denitrification in eutrophic sediment bioturbated by tube-dwelling chironomids indicates that at a similar biomass oligochaetes are less effective at mobilizing nitrate to deeper sediment layers. This is explained by the different ways oligochaetes and tube-dwelling chironomids bioturbate the sediment. Sieving and homogenising the sediment had no pronounced effect on rates of denitrification and nitrification compared to undisturbed sediment.

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Role of oligochaetes in the circulation of water and solutes across the mud-water interface

Cited by 14 publications

References 2 publications

Effects of Tubifex tubifex (Oligochaeta: Tubificidae) on N-mineralization in freshwater sediments, measured with 15N isotopes

Effects of Tubifex tubifex (Oligochaeta: Tubificidae) on N-mineralization in freshwater sediments, measured with 15N isotopes

Factors influencing taxonomic composition and abundance of macrozoobenthos in extralittoral zone of shallow eutrophic lakes

Nitrification and dentrification in a eutrophic lake sediment bioturbated by oligochaetes

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