. The crustacea of the plankton, July, 1894-Dec., 1896 . e other way: First, the food is moreplentiful near the surface, as the algae reproduce more abund-antly there. Second, when Daphnia pulicaria is present it isfar more abundant in the upper strata of the water than , Cyclops often appears in swarms near the bottom ofthe lake. Fourth, If Cyclops reproduces during the winterthe young are more numerous toward the surface. Tables B and C of the appendix show that during January, Feb-ruary, and the early part of March, 1895, there was very little dif-ference in the population of the
. The crustacea of the plankton, July, 1894-Dec., 1896 . e other way: First, the food is moreplentiful near the surface, as the algae reproduce more abund-antly there. Second, when Daphnia pulicaria is present it isfar more abundant in the upper strata of the water than , Cyclops often appears in swarms near the bottom ofthe lake. Fourth, If Cyclops reproduces during the winterthe young are more numerous toward the surface. Tables B and C of the appendix show that during January, Feb-ruary, and the early part of March, 1895, there was very little dif-ference in the population of the four upper levels. In January ofthat year the lower strata were decidedly poorer in number thanthose above; while in the latter part of the winter they werethe most populous, owing to the accumulation of Cyclops inthose levels. In the winter of 1896, the 0-3 m. level was atleast twice as populous as any below, owing to the large num- Trans. Wis. Acad., Vol. XL Plate XXXII. 0- 3 m Mch. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 200100 - V ^*^s ?. 6- 9 m
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