320 



PRE DAT I ON 



worthy were the very low mortalities in 1930-31 and 1931-32 when grouse had not yet recov- 

 ered from the scarcity of 1927 and 1928. In general, however, the number of birds killed 

 during the winter has varied directly with the population density of the preceding fall (figure 

 271. The proportion lost, however, has been less closely correlated*. 



Fall PopulaVioo 



~~~ Loss +o Following Fall 



500n 



400 



CONNECTICUT HILL 



in 



Q 300 



m 



a. zoo 



u 

 to 



2 



z 



lOO 



n ^°° 



Aoo 



300 



zoo 



loo 



Q 



5 ■'^ 



^ bo 



a. 

 u 



to 25 



D 



I 



ADIRONDACK 



I 



T5 



bo 



Z5 



1930-31 31-32 3233 3334 3-4-35 3S3C 3037 37 36 3a33 39-AO 4&4 1 41-42 



YEAR 



FIGURE 27. RELATIONSHIP OK NL'MBER OK AI>1 l.T (.ROl'SK LOST TO PRECKDINI. KALI. I'OI'rLATION 

 LEVEL ON CONNECTICUT HILL AND M>1H()M>\<K \UK\S I 'f.Hd- ! ') 12 



• S«- Chapter XU. |>. S;I2. 



