Table 31. Age cohorts chart.


 Mature 4 yr olds
 Females (some may be breeding) 3 yr olds
 Nesting N(SoS1S2S3) N(SOSlS2)

1959-60 5000 7 0
 (4500)
1960-61 6000 0 412


1961-62c (5400)- g 412 4500
 (4860)
196263d 3500 4500 7250
 (4374)
1963-64C -- 7250 8500_
 (3937) 7_
1964-65C 1300 8500 0
 (3543)
1965-66e 6000 0 1500
 (5400)
1966-67d 3680 1500 0
 (4860)
1967-68e 5000 0 0
 (4500)
1968-69 5700 0 1750
 (5130)
1969-70d 1900 1750 3675
 (4617)
 1970-71d 3000 ,% q675 0
 (4155)
 1971-72d 1500 0 170
 (3740)
 1972-73 -- 170 0
 (3366)
 1973-74d 2000 0 3000
 (30o9)
 1974-75d 3000 3000 0

 1975-76


242


estimated fledgling to first year survival rate (SO)
so N(SO) number
bolder bird survival rate not applied so, N number

Cno birds nested
dall adult birds did not nest

possibly almost all adult birds nested

fnore birds nested than were available
assumes 90% yearly survival for adults


2 yr old
N(S0S1)

 412


 4500


 7250


 8500


 0


 1500


 0


 0


 1750


 3675


 0


 170


 0


 3000


 0


 0


b a
s 1 yr olds
 N(S0)

 4500


 7250


 8500


 0


 1500


 0


 0


 1750


 3675


 0


 170


 0


 3000


 0


 0


 0


of 50% has been applied