Effect of deposit feeders on migration of 137Cs in lake sediments
dc.contributor.author | Robbins, John A. | en_US |
dc.contributor.author | McCall, Peter L. | en_US |
dc.contributor.author | Fisher, J. Berton | en_US |
dc.contributor.author | Krezoski, John R. | en_US |
dc.date.accessioned | 2006-04-07T17:37:20Z | |
dc.date.available | 2006-04-07T17:37:20Z | |
dc.date.issued | 1979-02 | en_US |
dc.identifier.citation | Robbins, John A., McCall, Peter L., Fisher, J. Berton, Krezoski, John R. (1979/02)."Effect of deposit feeders on migration of 137Cs in lake sediments." Earth and Planetary Science Letters 42(2): 277-287. <http://hdl.handle.net/2027.42/23642> | en_US |
dc.identifier.uri | http://www.sciencedirect.com/science/article/B6V61-473FKS4-72/2/181adc93879bb70dee0e93cf24fd05ec | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/23642 | |
dc.description.abstract | Illite clay particles with adsorbed 137Cs were added as a submillimeter layer to the surface of silt-clay sediments contained in rectangular Plexiglas cells stored in a temperature-regulated aquarium, in order to trace the effect of the oligochaete, Tubifex tubifex, and the amphipod, Pontoporeia hoyi, on mass redistribution near the sediment-water interface. A well-collimated NaI gamma detector scanned each sediment column (~10 cm deep) at daily or weekly intervals for six months, depicting the time evolution of radioactivity with and without added benthos. In a cell with tubificids (~5 x 104 m-2), which feed below 3 cm and defecate on surface sediments, the labeled layer was buried at a rate of 0.052 +/- 0.007 cm/day (20[deg]C). When labeled particles entered the feeding zone, 137Cs reappeared in surface sediments creating a bimodal activity profile. In time, the activity tended toward a uniform distribution over the upper 6 cm, decreasing exponentially below to undetectable levels by 9 cm. In a cell with amphipods (~1.6 x 104 m-2) uniform activity developed rapidly (~17 days) down to a well-defined depth (1.5 cm). The mixing of sediments by Pontoporeia is described by a simple quantitative model of eddy diffusive mixing of sediment solids. The value of the diffusion coefficient, 4.4 cm2/yr (7[deg]C) was computed from a least squares fit of theoretical to observed profile broadening over time. In a cell without benthos, small but measurable migration of 137Cs indicated an effective molecular diffusion coefficient of 0.02 cm2/yr. | en_US |
dc.format.extent | 959927 bytes | |
dc.format.extent | 3118 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Elsevier | en_US |
dc.title | Effect of deposit feeders on migration of 137Cs in lake sediments | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Geology and Earth Sciences | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Great Lakes Research Division, University of Michigan, Ann Arbor, MI 48109, U.S.A. | en_US |
dc.contributor.affiliationum | Great Lakes Research Division, University of Michigan, Ann Arbor, MI 48109, U.S.A. | en_US |
dc.contributor.affiliationother | Department of Earth Sciences, Case Western Reserve University, Cleveland, OH 44106, U.S.A. | en_US |
dc.contributor.affiliationother | Department of Earth Sciences, Case Western Reserve University, Cleveland, OH 44106, U.S.A. | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/23642/1/0000606.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1016/0012-821X(79)90035-9 | en_US |
dc.identifier.source | Earth and Planetary Science Letters | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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