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The Influence of Seasonal Hypoxic Events in the Central Basin of Lake Erie on the Short-Term Growth of Organisms from Multiple Trophic Levels

Documenting the effects of central basin Lake Erie hypoxia on   individual organism growth and nutritional status with traditional   measures (e.g., weight-length measures, energy densities, eggs per   individual) is difficult, because although the anoxic zone in Lake   Erie exists for a relatively short time period (1.5 months),  traditional measures of growth and condition integrate feeding   history and energetic utilization over the whole life-time of an   organism. Therefore, researchers will use RNA:DNA ratios in order to   index more recent growth and condition of individual animals. The   measurement of nucleic acid ratios is based on the notion that DNA  concentrations within individual cells remain fairly constant while   RNA concentrations increase as protein synthesis increases. Thus, a   well-fed, active, growing individual should have a relatively high   RNA:DNA ratio compared to a starving, inactive individual.     This project will compare nucleic acid concentrations among a suite   of representative organisms collected on two occasions (pre- and   during hypoxic conditions) from two regions of Lake Erie's central   basin, 1) an area where the hypolimnion becomes seasonally hypoxic,   and 2) an area where the hypolimnion remains relatively well-  oxygenated throughout the year. The researchers hypothesize that   recent growth rates (as indexed by mean RNA:DNA ratios) will not   differ significantly among regions prior to the onset of hypoxia,   but will be significantly greater in the non-hypoxic zone during   late summer.    (hypoxia); (hypoxic); (hypoxic conditions); (hypoxic condition);   (Lake Erie)

In progress
Start Date
End Date
Tomas HookPrincipal Investigator
Associated with 2 projects
National Sea Grant $ 0.00USDEstimates

Funding 1 projects for a total of $0.00
Scope of Study
Field Investigation
Scale of Phenomena
Lake Basin Connecting Channels
Lake Erie
Annex Numbers
Research & Development
Annex 17
Impact of water quality and AIS on fish and wildlife populations and habitats

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