Figure 1.-- Aerial photograph of Bare Lake, Alaska. 



300 Meters 



was apparently accelerated. The planktonic 

 crustaceans did not show a significant increase 

 in population size from 1950 to 1952, possibly 

 as a combined result of their long life cycle 

 and effective predation." The potential impor- 

 tance of the increased egg production is dis- 

 cussed in detail by Edmondson (1960). 



The 1957 study deals with the zooplankton 

 population, its species composition, seasonal 

 variations in abundance, and depth distribution 

 of the component species. All of the fish species 

 in Bare Lake are directly dependent at times in 

 their life cycle on the zooplankton population 

 as a major source of food. Since zooplankton is 

 an important link in the food chain, the study 

 is of value in determining the effects of ferti- 

 lizing Bare Lake. 



The 1957 findings are compared with the 

 results of the 1952 Bare Lake zooplankton 

 work of Nelson and Edmondson, with the zoo- 

 plankton populations of five small unfertilized 

 lakes of similar origin (glacial) in Colorado 

 (Pennak, 1944), and with the effect of in- 

 creased nutrients on zooplankton production 

 of two Michigan ponds (Waters, 1956). 



1000 Feet 



Figure 2.--Bare Lake, Kodiak Island, Alaska.Depih 

 contour intervals in meters. 



EQUIPMENT AND SAMPLING PROCEDURES 



Zooplankton collections at Bare Lake from 

 1950 to 1952 were taken withaClarke-Bumpus 



