Abstract
Parturition status of 53 radiocollared, female caribou ( Rangifer tarandus granti ) of the central Arctic herd was determined through repeated observations by fixed-wing aircraft during 2–5 periods of parturition. The overall frequency of reproductive pauses for females that were initially parturient, or previously confirmed to be parturient, was 24% (ca. once every 4 years). Most pauses preceded (78%) and followed (87%) parturition events. Periodic infertility, as a response to nutritional stress, may enhance long-term reproductive performance in caribou and other ungulates.
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