Table 11. --Split-plot analysis of variance of abundance in tow net catches of pond smelt (Coville 

 Lake), threespine stickleback (Coville Lake and West End) and ninespine stickleback (Coville Lake 

 and West End), 1962-64. Analysis involves only paired surface and deep tows and considers vari- 

 ation due to sampling areas, time (July 1-15, July 16-51, August 1-15, August 16-51), and depth 

 (surface versus deep) of tow. 



22 



