Volume 29, Number 1—January 2023
Research
Widespread Exposure to Mosquitoborne California Serogroup Viruses in Caribou, Arctic Fox, Red Fox, and Polar Bears, Canada
Table 1
Variables | Range | Description (reference) |
---|---|---|
Biologic | ||
Age, y | 5–31 | Age of polar bear according to tooth histology (17) |
Sex | 1/0# | Field determination with females as reference category |
Poor condition† | 1/0# | Polar bears rated 1 or 2 on 5-point body condition index (22) |
Good condition† | 1/0# | Polar bears rated 4 or 5 on 5-point body condition index (22) |
Weight, kg‡ | 136–602 | Calculated weight (23) matched to temporal equations for WHB |
Conflict§ |
1/0# |
Polar bears captured by Manitoba Conservation in Churchill, MB (24) before sample collection |
Climatic¶ | ||
Ice free, d | 110–152 | No. days sea ice concentration was <15% as determined by SSM/I (25), within 95% MCP estimate of polar bear home range (12) |
Summer temperature, °C | 7.8–10.8 | Mean air temperature, June–September, measured at Churchill airport, MB (26) |
Summer precipitation, mm | 169.0–310.6 | Total precipitation, June–September, measured at Churchill airport, MB (26) |
Winter temperature, °C | –30.0 to –24.9 | Mean minimum air temperature, December–March, measured at Churchill airport, MB (26) |
Annual temperature, °C | –7.4 to –5.2 | Mean annual air temperature measured at Churchill airport, MB (26) |
Annual precipitation, mm | 344.7–507.8 | Total annual precipitation measured at Churchill Airport, MB (26) |
*This table was published previously (18). MB, Manitoba; MCP, minimum complex polygon; SSM/I, special sensor microwave/imager; WHB, western Hudson Bay. †The 5-point body condition index was dummy-coded with an average score of 3 forming the reference category. ‡Mean weight centered within sex before modeling. §Bears with a history of capture as part of the Polar Bear Alert Program prior to sampling. ¶All climate variables measured the year before serum sample collection. #Multiple linear regression was used to model seropositivity with fixed effect variables 1/0 (positive/negative) as dependent variables.
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