198 



PLANKTON OF WISCONSIN LAKES 



Table 29. The maximum, minimum, and mean amounts of dry or- 

 ganic matter obtained from the net plankton and from the nannoplank- 

 ton of Lakes Monona and Waubesa. The results are stated in milli- 

 grams per cubic meter of water. Compare with Lake Mendota, table 

 6 and table 17. 



NET PLANKTON 





Lake Monona 





Lake Waubesa 



Year 



Number 



of 

 Samples 



Maxi- 

 mum 



Mini- 

 mum 



Mean 



Number 

 of 



Samples 



Maxi- 

 mum 



Mini- 

 mum 



Mean 



1911 



4 



6 



16 



8 

 13 



519.3 

 3,303.6 

 1,925.1 

 2,161.8 

 1,226.1 



134.3 

 213.3 

 259.6 

 404.0 

 109.3 



345.7 

 1,344.0 



839.0 

 1,404.0 



450.6 











1912 











1913 

 1915 

 1916 



2 



4 

 12 



1,890.0 

 4,232.5 

 2,654.3 



1,868.5 



1,580.0 



471.1 



1,879.2 

 3,214.2 

 1,114.2 



NANNOPLANKTON 



1915 

 1916 



8 

 13 



3,746.5 

 5,696.2 



723.0 

 672.1 



2,339.5 

 2,355.6 



4 

 12 



6,143.2 

 4,830.9 



2,871.2 

 801.0 



4,260.2 

 2,977.5 



Table 30. The range of variations in the percentage and in the 

 quantity of nitrogen in the net plankton of Lake Monona. Compare 

 with Lake Mendota, table 7. 



Year 



Number 



of 

 Analyses 



Per Cent, Ash Free 



Milligrams per Cubic Meter 

 of Water 





Maximum 



Minimum 



Mean 



Maximum 



Minimum 



Mean 



1911 

 1912 

 1913 

 1915 

 1916 



4 



6 



16 



8 

 7 



9.91 



9.67 



10.39 



11.71 



9.89 



6.85 



8.83 

 7.15 

 8.09 



7.18 



9.20 

 9.20 

 8.70 

 10.71 

 8.37 



46.9 

 302.2 

 157.7 

 237.6 



88.0 



13.2 

 20.0 

 24.6 

 40.5 

 21.1 



31.8 

 123.6 



73.0 

 150.5 



53.0 



Table 31. Variations in the percentage and in the quantity of crude 

 protein in the net plankton of Lake Monona. Compare with Lake Men- 

 dota, table 8. (Crude protein equals N X 6.25.) 



Year 



Number 



of 

 Analyses 



Per Cent of 

 Organic Matter 



Milligran 



is per Cubic 

 of Water 



Meter 



Maximum 



Minimum 



Mean 



Maximum 



Minimum 



Mean 



1911 

 1912 

 1913 

 1915 

 1916 



4 



6 



16 



8 



7 



61.9 

 60.4 

 65.0 

 73.2 

 61.8 



42.7 

 55.2 

 44.7 

 62.6 

 44.9 



57.5 

 57.5 

 54.4 

 67.0 

 52.3 



293.1 

 1,888.7 



985.6 

 1,485.0 



550.0 



112.5 

 125.0 

 153.7 

 253.1 

 131.9 



198.8 

 772.3 

 456.2 

 940.6 

 331.2 



