Geochemical Composition of the Nepheloid Layer in Lake Ontario

Mudroch, A.; Mudroch, Paul

doi:10.1016/s0380-1330(92)71281-7

Cited by 32 publications

(12 citation statements)

References 25 publications

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“…In the bottom water, the Si/Al ratio ranged from 3.3 to 43. An increase in the Si/Al ratio in the bottom water was also reported in Lake Ontario, where diatoms were the dominant species (Mudroch and Mudroch 1992). In the nepheloid layer of Lake Ontario, the concentration of particulate Si ranged from 2.5 to 24 µM, and the Si/Al ratio was 9.2 to 42.…”

Section: Resultssupporting

confidence: 57%

Characterization of suspended solids in Lake Biwa by measuring their elemental composition of Al, Si, P, S, K, Ca, Ti, Mn, and Fe

2002

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Section: Resultssupporting

confidence: 57%

Characterization of suspended solids in Lake Biwa by measuring their elemental composition of Al, Si, P, S, K, Ca, Ti, Mn, and Fe

2002

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“…The composition of the material in the bnl is more varied. Mudroch and Mudroch (1992) examined the material in the bnl in Lake Ontario and found that its composition changed from location to location; in some cases it was primarily biogenic in origin while in others much of it was similar to material on the bottom. Shaffer (1988) made observations at a station in 160 m of water in southern Lake Michigan and found significant enrichment of allochthonous material in the bnl.…”

Section: Discussionmentioning

confidence: 99%

“…Several investigators have proposed theories for the origin and maintenance of the bnl in the Great Lakes. These include local resuspension (Chambers and Eadie 1981, Sandilands and Mudroch 1983, Rosa 1985, Baker and Eisenreich 1989, Halfman and Johnson 1989, Mudroch and Mudroch 1992, downslope advection of nearshore material (Halfman and Johnson 1989), and settling of biogenic material (Sly 1994). Although time series measurements of both current velocity and water transparency are required to test these hypotheses, none were made in any of these studies.…”

Section: Introductionmentioning

confidence: 99%

Observations of Nepheloid Layers Made With an Autonomous Vertical Profiler

Hawley

Muzzi

2003

Journal of Great Lakes Research

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“…Bacterial biosynthesis in the BNL-The development of a BNL, zones of high suspended-particle density, is a common feature in lakes (e.g., Mudroch and Mudroch 1992;Wieland et al 2001). They have often been associated with resuspension of sedimented material or sediment focusing (Hawley and Lee 1999;Wieland et al 2001).…”

Section: N In the Epilimnion: Reliable Indicator Of Nitrate Utilizatimentioning

confidence: 99%

Seasonal variation of the δC and δN of particulate and dissolved carbon and nitrogen in Lake Lugano: Constraints on biogeochemical cycling in a eutrophic lake

Lehmann

Bernasconi

McKenzie

et al. 2004

Limnology & Oceanography

188

190

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We determined the ␦ 13 C and ␦ 15 N of water-column particulate organic matter (POM), dissolved inorganic carbon, and nitrate, together with water chemistry and phytoplankton biomass and species composition every month in eutrophic Lake Lugano. As primary productivity increased during spring, the ␦ 13 C of photic-zone POM increased from Ϫ34‰ to Ϫ24‰. This 13 C enrichment reflects decreasing C-isotope fractionation between organic and inorganic carbon pools in response to decreasing surface water [CO 2 (aq)]. Variations in the ␦ 15 N of surface-water POM (ϩ2‰ to ϩ8‰) collected during the productive period were attributed to isotope effects associated with nitrate uptake, nitrogen fixation, and mixing of different organic matter sources. The apparent N-isotope enrichment () associated with nitrate assimilation varied with ϭ Ϫ1.0‰ Ϯ 0.9 for diatoms and ϭ Ϫ3.4‰ Ϯ 0.4 for green algae. The mechanisms controlling the N-isotopic composition of surface-water nitrate include the combined processes of nitrate assimilation, nitrification, mixing of water masses, and external nitrate loading. There was no consistent relation between the ␦ 15 N of POM, the ␦ 15 N of nitrate, and the nitrate concentration in surface waters. Low ␦ Stable carbon and nitrogen isotope measurements of autochthonous material from aquatic environments have proven to be a powerful tool to better understand biologically driven carbon and nitrogen cycles. Such studies helped to assess the sources and cycling of organic matter (e.g., Cifuentes et al. 1988;Bernasconi et al. 1997;Huon et al. 2002) and to identify microbial processes (e.g., Ostrom et al. 1997;Brandes et al. 1998). Through the carbon and nitrogen stable isotope analysis of sediments, insights may be gained into the trophic evolution of lakes, provided that the processes controlling isotope fractionation during organic matter synthesis and degradation are well understood. For example, the C-isotopic composition of lacustrine organic matter has been used as a proxy indicator for primary productivity, pCO 2 (aq) and CO 2 versus HCO uptake (Hollander and McKenzie Ϫ 3 1991;Ostrom et al. 1997; Hodell and Schelske1998).Variations in the isotopic composition of organic and inorganic nitrogen species in aquatic environments can be re-

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Geochemical Composition of the Nepheloid Layer in Lake Ontario

Cited by 32 publications

References 25 publications

Characterization of suspended solids in Lake Biwa by measuring their elemental composition of Al, Si, P, S, K, Ca, Ti, Mn, and Fe

Characterization of suspended solids in Lake Biwa by measuring their elemental composition of Al, Si, P, S, K, Ca, Ti, Mn, and Fe

Observations of Nepheloid Layers Made With an Autonomous Vertical Profiler

Seasonal variation of the δC and δN of particulate and dissolved carbon and nitrogen in Lake Lugano: Constraints on biogeochemical cycling in a eutrophic lake

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