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Survival of Adult Female Northern Pintails in Sacramento Valley, California

Tables


Table 1.  Summary statistics and analyses of variance for body mass and morphometry of after-hatching-year female northern pintails radiotagged in Sacramento Valley, California, 1987-89.
Variable Year
1987 n = 54 1988 n = 60 1989
n = 76
mean of x SE mean of x SE mean of x SE
Body Mass 795A 10a 795A 10 755B 10
Wing Chord (mm) 261.75A 0.94 256.73B 0.89 262.16A 0.79
Culmen (mm) 47.68A 0.22 47.29B 0.21 46.91B 0.19
Tarsus (mm) 50.24A 0.24 50.23A 0.23 49.92A 0.20
a Means with same letter within rows are not different using Fisher's protected LSD value (P > 0.05).

 

Table 2.  Kaplan-Meier survival estimates, hunting and nonhunting mortality rates, and radio exposure days for adult female northern pintails radiotagged in Sacramento Valley, California, 1987-89.
Winter Period Intervals Days na Exposure
Days
Deaths Survival SE Huntingb
Mortality
Nonhuntingb
Mortality
1987-88 Preseason 60 54 3,138 2 0.962 0.027 0.000 0.038
Hunting Season 79 50 3,711 4 0.912 0.042 0.087 0.000
Postseason 33 40 1,133 1 0.972 0.027 0.000  0.028c
Overall 172 54 7,982 7 0.854 0.051 0.087 0.059
1988-89 Preseason 58 60 3,280 2 0.966 0.024 0.000 0.034
Hunting Season 79d 53 3,984 1 0.980 0.020 0.020 0.000
Postseason 47 47 1,905 3 0.933 0.038  0.021e 0.046
Overall 184 60 9,169 6 0.883 0.046 0.041 0.076
1989-90 Preseason 64 76 4,354 1 0.986 0.014 0.000 0.014
Hunting Season 71d 59 3,644 2 0.960 0.028 0.040 0.000
Postseason 47 41 1,245 1 0.952 0.045  0.048e 0.000
Overall 182 76 9,243 4 0.901 0.053 0.086 0.013
a Max. no. of pintails monitored during interval.
b Obtained by censoring mortalities from other sources; no difference between hunting and nonhunting rates.
c Mortality of unknown cause classed as nonhunting. 
d Includes 59 days of hunting and 20 days (1988-89) or 12 days (1989-90) split with no hunting.
e 1 illegal kill 14 Jan 1988; 1 illegal kill 10 Feb 1990.

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