necessary to remove 12 existing and furnish and install 12 new hypolimnetic
aerator units or approved
water withdrawal or chemical precipitation) could also be considered to reduce and control the release of P from anoxic sediment.
water can be withdrawn, exposed to pure oxygen under high pressure and then delivered back to the hypolimnion.
In winter the TP content increased in the upper water layer and decreased in the lower layer, while anaerobic hypolimnetic
water with a high TP content had mixed with the water of the upper layer.
Except for hypolimnetic
samples for June, there were no significant differences between field observations and laboratory measures.
For example, 193 of the 240 publicly owned reservoirs evaluated in Kansas were eutrophic and frequently showed symptoms of eutrophication, including nuisance algal blooms, reduced water transparency, and depleted levels of hypolimnetic
During much of the stratified period, flux into hypolimnetic
traps was often less than flux in the uppermost trap, indicating the interception of material in the vicinity of the thermocline.
pulicaria were isolated from Gull Lake, Kalamazoo County, Michigan, USA; one represents a behavioral morph that, in summer, remains in deep, hypolimnetic
waters both day and night, while the second clone represents a morph that exhibits a 15-m diel vertical migration.
The geographically restricted distribution of the leopard darter, together with losses of populations downstream of reservoirs with hypolimnetic
water release (Zale et al.
polymorpha prevents its penetration into oxygen-depleted hypolimnetic
waters (Matthews and McMahon, 1994) and is reflected by inhibition of byssogenesis at oxygen concentrations higher than those reported to inhibit byssogenesis in M.
In experiment 5, we collected Daphnia from two sources, the epilimnion of Gull Lake and the hypolimnion of Lawrence Lake (at the time of the experiment we could not find lakes with large populations of both migrating and hypolimnetic
anoxia also occurred, a characteristic of the period.