Movement-based methods to infer parturition events in migratory ungulates

Canadian Journal of Zoology, e-First Articles. Long-distance migrations by ungulate species are a globally imperiled natural phenomenon and conservation of them requires monitoring population vital rates. Satellite telemetry tracking is widely used for understanding the spatial distribution and movement of animals, especially migratory animals in remote environments. Recently, analytical methods have been developed to infer parturition events from movement data in multiple species that calve in isolation, but to date such methods have not been tested on animals that both migrate and spatially aggregate during calving. We applied two movement-based methods developed to infer parturition in nonmigratory woodland caribou (Rangifer tarandus caribou (Gmelin, 1788)) to 241 reproductive seasons spanning 6 years of GPS data from migratory barren-ground caribou (Rangifer tarandus granti J.A. Allen, 1902). We compared results from both methods to data from aerial surveys of collared females during the calving period. We found that each movement-based method had ∼80% overall accuracy to identify calving events, with interannual variation ranging from 61% to 100%. When we considered instances when the two analytical methods agreed on parturition outcome, the accuracy increased to 89% with an annual range of 73%–100%. Using these methods, we identified ma rked interannual differences in peak calving dates and higher parturition rates than previously reported for this caribou her...
Source: Canadian Journal of Zoology - Category: Zoology Authors: Source Type: research

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Source: HNO - Category: ENT & OMF Tags: HNO Source Type: research
Authors: Hoffmann TK PMID: 32060569 [PubMed - as supplied by publisher]
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Source: Journal of Gambling Studies - Category: Addiction Source Type: research
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Source: Military Medicine - Category: International Medicine & Public Health Tags: Mil Med Source Type: research
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Source: Military Medicine - Category: International Medicine & Public Health Tags: Mil Med Source Type: research
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