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Population and Movement Characteristics of Radio-Collared Striped Skunks in North Dakota During an Epizootic of Rabies

Table 5


TABLE 5: Causes of mortality, total days (Days) and number of mortalities (m) observed, estimated survival rates (^S)a, mortality rates (Rate), and dates of last cause-specific mortality (Date) of striped skunks by Group (sex with age classesb combined, or age class with sexes combined) in Stutsman County, North Dakota during April to June 1991 and April to July 1992.
Total observed Cause of mortality
Rabiesc Predationd Other
Group Days m ^S (SE) Rate m Date Rate m Date Rate m Date
1991
Males 63 0 1.000 (0.000) 0.000 0 -- 0.000 0 -- 0.000 0 --
Females 64 2 0.720 (0.120) 0.000 0 -- 0.000 0 -- 0.280 2 1 June
1b 63 1 0.833 (0.139) 0.000 0 -- 0.000 0 -- 0.167 1 15 May
2 64 0 1.000 (0.000) 0.000 0 -- 0.000 0 -- 0.000 0 --
Totale 64 2 0.849 (0.070) 0.000 0 -- 0.000 0 -- 0.151 2 1 June
1992
Males 107 16 0.111 (0.060) 0.803 11 19 June 0.281 4 10 June 0.063 1 11 May
Females 103 23 0.205 (0.058) 0.606 13 11 July 0.241 5 19 June 0.225 5 18 June
1b 106 6 0.080 (0.054) 0.583 3 7 July 0.583 2 10 June 0.200 1 14 May
2 103 17 0.350 (0.078) 0.567 14 11 July 0.091 2 19 June 0.038 1 18 June
Total 107 39 0.173 (0.042) 0.671 24 11 July 0.290 9 19 June 0.174 6 18 June
aKaplan-Meier survival estimates from staggered entry design (Pollock et al., 1989).
bAge class 1, <1 yr old; age class 2, ≥2 yr old.
cDetermined by fluorescent antibody technique.
dIncludes some animals that tested positive for rabies.
eColumns do not sum to totals because ages were not estimated for all skunks.


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