Abstract
Upwelling events in Lake Ontario were studied to determine (1) their significance as mechanisms to provide nutrients from the hypolimnion to the epilimnion and (2) their impact on resident plankton communities of the nearshore zone. It was concluded that such events did not result in sufficient mixing to recharge nutrient stocks of these areas. Upwellings were characterized as being temporal displacements of nearshore water masses which returned at the end of each event. Plankton communities of the nearshore area were displaced with the water mass and therefore received little or no benefit from the upwelled nutrient rich hypolimnetic waters. Evidence is provided to suggest that diatom species such as Asterionella formosa Hass and Fragilaria crotonensis Kitton were able to grow in the upwelled hypolimnetic water, and upwellings might be a mechanism to inoculate these species into the epilimnion of deep lakes prior to the autumn overturn. Upwelling events also caused rapid shifts in the species composition of zooplankton communities. Such shifts were particularly pronounced within 1 km of the shoreline.
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