Mysis diluviana and Hemimysis anomala: Reviewing the roles of a native and invasive mysid in the Laurentian Great Lakes region

Walsh, Maureen G.; Boscarino, Brent T.; Marty, Jérôme; Johannsson, Ora E.

doi:10.1016/j.jglr.2012.03.003

Cited by 12 publications

(2 citation statements)

References 48 publications

(39 reference statements)

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“…Zooplankton have particle sizes comparable to sediment sizes that may appear as spikes in the acoustic backscatter and/or a turbidity signal (Lohrmann ; Walsh et al ). Therefore, it is necessary to eliminate zooplankton from being spuriously interpreted as resuspension.…”

Section: Resultsmentioning

confidence: 99%

“…During the resuspension events (Table ), spikes in Chl‐ a (as required for zooplankton grazing; Blukacz et al ) and/or diurnal migration patterns were not observed. High backscatter measurements during resuspension events are not due to zooplankton, because the turbulence generated velocities are stronger than the typical zooplankton swimming speed, preventing the development of coherent patches of zooplankton (Stich and Lampert ; Blukacz et al ; Walsh et al ). Thus we conclude the resuspension events listed in Table are all due to bottom sediment resuspension (see also Churchill et al ; Hawley and Eadie ).…”

Section: Resultsmentioning

confidence: 99%

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Sediment resuspension mechanisms and their contributions to high‐turbidity events in a large lake

Valipour

Boegman

Bouffard

et al. 2017

Limnology & Oceanography

100

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High-resolution field data, collected during April to October of 2008-2009, were analyzed to investigate the quantitative contribution of sediment resuspension to high-turbidity events in central Lake Erie. Resuspension events were distinguished within high-turbidity events according to turbidity, fluorescence and acoustic backscatter timeseries, as well as satellite images. We observed 16 high-turbidity events, causing a total duration of 20 d (out of 344 d) with elevated nearbed turbidity (> 10 NTU). Of these events, 64% were correlated with algal biomass, with the remaining 18%, 5%, and 4% being attributed to sediment resuspension by surface waves, storm-generated currents and enhanced nearbed turbulence induced by highfrequency internal waves, respectively. This is the first time that resuspension by enhanced nearbed turbulence from high-frequency linear internal wave degeneration has been observed in a large lake. Resuspension was parameterized as a function of the instantaneous critical bottom velocity, bottom shear stress and the Shields parameter. From the in situ measurements, we suggest an extended Shields diagram for silty bed material that can be used to predict resuspension in other aquatic systems with similar sediment composition (20% cohesive sediment).

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Section: Resultsmentioning

confidence: 99%