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<br />. FEE 05 '90 :7:30 <br /> <br />.c. <br /> <br />primary and secondary production by determining the area and <br />volume available for effective benthic and planktonic <br />production, respectively. The extent to which fluctuating <br />flows atrect the organie load, nutrient regeneration <br />processe., and the resulting provisioning of dissolved <br />nutrients necessary for downstream production is presently <br />unknown. <br /> <br />Information Needs: Seasonal data will be collected on the <br />distribution of water temperature, salinity, nutrients, and <br />organic matter in Lake Powell above Glen canyon Dam (see <br />also H.-17.1). These same parameters and sediment load will <br />be measured in discharge waters from the dam at selected <br />downstream sites, and from selected tributaries during <br />research discharge periods. System-level production will be <br />assessed through a coDbination ot primary <br />prOduction/respiration and organic matter import/export <br />ratios during these same periods. Site-specific estimates <br />of nutrient levels, nutrient uptake and regeneration <br />processes, and primary productivity will also be made in <br />zones of fluctuations with controls below the level of <br />minimulII flows. <br /> <br />The fOllowing secondary hypotheses will be tested using <br />intormation generated in the research program to test hypothesis <br />H.-7.1. <br /> <br />H.-7.1a. There is no significant relationship between <br />nutrient availability in the stream system and the magnitude of <br />discharge fluctuation and rate of change of fluctuating <br />discharges. <br /> <br />H.-7.lb. There is no significant change in the short-term <br />(within seasons) relationship between the import and export rates <br />ot organic matter and nutrients to and tram the L.e's Perry reach <br />and the magnitude of discharge fluctuations, discharge volume (a <br />function of discharge rate) and the rate of change of discharge <br />fluetuations. <br /> <br />8.-7.1c. There is no significant relationship between the <br />distribution of primary (and associated seeondary productivity) <br />throughout the Canyon system and the magnitude of discharge <br />fluctuations, discharge volumes and the rate at change of <br />fluctuating discharges. <br /> <br />a.-7.ld. There is no significant relationship between the <br />Short-term (within seasons) availability of important food <br />resources (algal and invertebrate) for trout and the magnitude of <br />diSCharge fluctuations, discharge volume, and the rate at Change <br />ot discharge fluctuations. <br /> <br />l2 <br />