82 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I49 



Table 8. — Wilcoxon test on numbers of living B. frigida in E. advena zone. 



June 1961 n = 8 p _„ Junel962f »=10 p 



Oct. 1961 m = S " m -° l Sept. 1962 m=10 /c "~ w 



June 1961 n = 8 _ „ June 1962 » = 10 p _ 07 



Jan. 1962 m = 8 *— M Mar. 1962 m = 10* m_y/ 



June 1961 m = 8 p _ _. June 1962 n=10 p _„ 



Mar. 1962 n = 10 m Jan. 1962 w = 8 m "~ 



June 1961 ?» = 8 p _ , . June 1962 n = 10 p _ ._ 



Junel962 »=10 ffl ~ Oct. 1961 w = 8 Km ~ b/ 



June 1961 n = & . June 1962 f n = 10 p _ ._ 



Sept. 1962 m = 7 Km ~^ Nov. 1962 m = 7 Km ~™ 



* Significant at the 95 percent level, 

 t Greater number of living individuals. 



Table 9. — Wilcoxon test on numbers of living individuals of all species in the 



E. advena zone. 



June 1961 n = 8 p _™ Oct. 1961 m = 8 p _ 81 



Jan. 1962 m = 8 Km ~ w June 1962 n=lQ Km -* 1 



June 1961 m = 8 p _, Q June 1961 m = 8 p _ m 



March 1962 n = 10 Km ~ w June 1962 n = 10 * m - ou 



June 1961 n = 8 p __„ Junel962f n=10 p _-« 



Sept. 1962 m = 7 m March 1962 m- 10 " "~ 



June 1961 m = 8 „ _„ June 1962 1 n=10 p _ »_ 



Oct. 1961 n = 8 ^" _W Sept. 1962 « = 7 Km ~" 



Oct. 1961 1 n = S D _„* June 1962 n = 10 p _ ,. 



Jan. 1962 m = 8 *" ~ M Jan. 1962 m = 8 *" ~ 



* Significant at the 95 percent level. 



t Greater number of living individuals. . . 



