Appendix 



{See chapters 2 and 8, pp. 322-324) 



The weights, size of testes or ovaries, and fatness of common migra- 

 tory birds at Anaktuvuk are shown in the following figures, of which 

 21 to 32 (top) are for males and 32 (bottom) to 36 are for females. 



On the left-hand ordinate weights have been referred to base 100 as 

 the average of all weights of a species. On the right-hand ordinate is 

 shown weight in grams. 



Testes and eggs are graded as big when near the maximmn size for 

 the species. 



Fatness ranges from fat (F), medium fat (MF), little fat (LF), to 

 very little fat (VLF). 



Explanation of symbols used within the plot : 



( m. ) average weight 



(s.d.) standard deviation 



(c.v. ) coefficient of variation = s.d. x 100% 



( F ) mean of dates of first migrants' arrival 



(L) date of start of egg laying 



369 



