||Trophic Level Interrelationships in Cayuga Lake, New York.
Hennic, Douglas G. ;
||Cornell Univ., Ithaca, N.Y. Water Resources and Marine Sciences Center.
||TR-47; DI-14-31-0001-3832; OWRR-A-041-NY; 1903769,; A-041-NY(1)
Cayuga Lake ;
Food chains ;
Water resources ;
New York ;
Statistical data ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Presented are the results of a research investigation of the relationship of alewife growth rate and foraging effort to zooplankton standing crop. Data were collected from Lake Cayuga, New York and consisted of length-frequency measures of alewives and zooplankton, and catch/per unit of alewives. Alewife samples were caught in specially designed experimental gill nets. Seasonal variance in the growth rate of yearling alewives in Cayuga Lake can be accounted for solely by fluctuations in food supply; growth rate is not affected by summer range temperatures. Evidence from both gill net catch per unit effort, and the relationship between alewife growth rate and zooplankton concentration indicated that alewife foraging effort is proportional to food supply. Zooplankton standing crop is a vital measure of the food supply of alewives.