268 R. G. Stross et al. 



TABLE 6-8 Estimated Rates of Filtering, Ingestion, Assimilation, Growth, 

 and Reproduction for Daphnia middendorffiana in a typical 

 Tundra Pond at Barrow, Alaska on a Clear Day in Mid-July 



50 /LJgC liter "^ 



60iUgCUter"^ 



75 /L(g C Uter"^ 



100 jug cuter"* 



Food 50 /Ug C liter"* 

 60)Ltg C liter"* 

 75 /Ug C liter"* 

 100 )UgC liter"* 



Carbon Content (ind^) * 



(/igC) 7.56 17.92 35.0 60.5 



Respiratory Rate (crude) 



10°C mean (jug Chr"*) .03 .06 .11 .17 



Assimilation 

 (AlgChr"*)b 



Length (mm) 1.5 2.0 2.5 3.0 



Food 50 jug C liter"* 



60 jug cuter"* 



75 jUg C Uter~* 



100 jUg cuter"* 



Growth Rate'^ 



Length (mm) 1.5 2.0 2.5 3.0 



Eggs day *^ 



Egg Size 2.94 2.94 3.73 4.5 



a. JUg C ind = 2.24 (length, mm)^ 



b. efficiency = 0.7 



c. biomass, m = M^ exp (gt), where M^ is egg mass 



d. eggs day"* = (assimilate day"*) (0.2 + 157.2 (0.0079 length (mm))*"*"*; 



