APPENDIX 



197 



Table 26. The quantity of dry organic matter in the total plankton 

 of Lake Mendota during the different months of the year. The figures 

 indicate the averages for the different months and cover the period 

 from April, 1915, to June, 1917. The fi,rst part of the table gives the 

 results for the deep water, that is, the area within the 20 meter con- 

 tour line, and the second part shows the amount when the entire area 

 of the lake is taken into account. The live weight of this material 

 would be approximately ten times as large as the dry weights shown in 

 this table. 



Month 



Deep Water 



Kilograms 

 per Hectare 



Pounds 

 per Acre 



Entire Lake 



Kilograms 

 per Hectare 



Pounds 

 per Acre 



January. . 

 February . 

 March. . . 



April 



May 



June 



July 



August . . . 

 September 

 October . . 

 November 

 December . 



456.5 

 257.7 

 325.8 

 505.5 

 462.0 

 414.0 

 406.3 

 315.6 

 385.8 

 468.2 

 487.2 

 521.5 



407.3 

 230.1 

 290.8 

 451.0 

 412.1 

 369.3 

 362.4 

 281.5 

 344.1 

 417.6 

 434.6 

 465.2 



251 

 141 

 179 



278, 



254. 



228.0 



223.9 



174.0 



212.6 



258.0 



268.5 



287.5 



224.4 

 126.1 

 160.2 

 248.6 

 227.1 

 203.4 

 199.7 

 155.2 

 189.6 

 230.1 

 239.5 

 256.4 



Table 27. This table shows the amount of organic matter in the 

 net plankton and in the nannoplankton of Lake Mendota in the 0-13 

 meter stratum and in the 14-20 meter stratum on August 7, 1915. The 

 amounts are given in milligrams per cubic meter of water. 



Sample 



Stratum, 

 f. Meters 



Organic Matter, 

 Mg. per Cu. M. 



No. 593, Nannoplankton 



No. 591, Nannoplankton 



0-13 

 14-20 



0-13 

 14-20 



1,686.4 

 703.6 



No. 594, Net plankton 



No. 592, Net plankton 



264.2 

 22.3 







Table 28. Quantity of organic matter in the total plankton (net 

 plankton plus nannoplankton) of the different strata of Lake Mendota 

 on August 7, 1915. These estimates are based on the results sliown 

 in table 27 and on the numerical data obtained in these catches. 



Stratum, 

 Meters 



Kilograms 

 per Hectare 



Pounds 

 per Acre 



Per Cent of 

 Total Amount 



0-5 

 0-10 

 0-13 

 14-23 

 0-23 



117.1 

 214.6 

 253.6 

 65.3 

 318.9 



104.5 

 191.4 



226.2 



58.3 



284.5 



36.7 

 67.3 

 79.5 

 20.5 

 100.0 



