Phytoplankton, Photosynthesis, and Phosphorus in Lake Minnetonka, Minnesota1

Abstract

The temporal and spatial variations of chlorophyll concentrations (n) and integral photosynthesis (Zp) are described for a large, morphometrically complex lake. The &ily x-ate of l Contribution No. 90, Limnological Research Center, University of Minnesota. Financial support for this investigation came from the U.

Predicting rates of primary production in the vicinity of the Subtropical Convergence east of New Zealand

“…)> as a result of enzymatically-controlled rate processes, should manifest in a similar temperature dependency with P^p t . Regression analysis identified a significant (P < 0.015) linear temperature dependency of P* such that our relationship equates closely to that presented by Megard (1972), but it only described 20% of the variability, P*pt =0.186 x 7° + 1.27 (n = 32; P< 0.014; r 2 = 0.19). Nevertheless, using this linear temperature dependant estimate of P opt in the surface model explained slightly more of the variability (77%).…”

Periphyton Production in an Appalachian Mountain Trout Stream

“…Oxygen production is reported as gross primary productivity, while co 2 analysis by infrared gas analysis or titration is reported as net primary production. These methods have the advantage of being able to estimate net community Westlake (1974), Stockner (1968), Megard (1972), bBott et al (1978 0.556•(Gross production) = net production, average of conversions by Westlake (1974) and Likens (1975) ~a and b combined 8.40 kcal = g C, derived from Odum (1971) e f0.45 dry wt = g C, Odum (1971) 0.47 ash free dry wt = g C, Westlake (1974) ~reported by Mann (1975) .reported by Wetzel (1975a) 1 .summer average, approx. ~approximate annual average 1 reported by de la Cruz (1978) reported as mean daily rate x 365, probable over estimate, most measurements from summer…”

Preliminary evaluation of the ground-water-flow system in the Twin Cities Metropolitan area, Minnesota

“…There is little published data on the concentrations of major constituents in water from Lake Minnetonka. However, a sample of water collected from the lake in October 1961 had a combined milliequivalence of major dissolved constituents of about 6.5 (Megard, 1972). This is equal to about 60 percent of the median milliequivalence of major dissolved constituents in water from the Jordan Sandstone, and lends support to the recharge hypothesis if the decrease in dissolved solids in water from the Jordan is caused by simple dilution.…”