abstract |
The reconstruction
and translation into Ukrainian of a forgotten rare
study of 56 cases of natural death of polar bears
on Wrangel Island recorded during 1964–1982 is presented.
The data set was divided into several logical pairs
and the needed calculation of average values and
correlation coefficients were provided. The series
of comparisons were performed using T-White and
W-Wilcoxon criteria. Finalization showed that the
process of the deaths’ detection had demonstrated
high unevenness, but it had some chances to be predictable.
Between 1964 and 1982, an average of 2.7–3.7 adult
bear deaths per year were recorded, along with 1.27
deaths of cubs and 0.47 of females. The summarized
number of survived cubs-per-mother in 1964–1982
fluctuated as 2 >> 1> 3. |
references |
Prydatko, V.I. 1982.
Polar Bear Natural Mortality Assessment in a Limited
Area. In: Abstracts of the Conference ‘Protection
of predatory mammals of the Far East’, September
27-28, 1982. VNII_Priroda, Vladivostok, 39–41. [In
Russian]
Regehr, E. V., S. C. Amstrup, I. Stirling. 2006.
Polar bear population status in the Southern Beaufort
Sea. Open-File Report 2006-1337. Written at Anchorage,
Alaska. USGS, Reston, Virginia, 1–30. https://on.doi.gov/3lTthwF.
Retrieved 28 May 2020.
Wiig, Oystein & Amstrup, Steven & Atwood,
Todd & Laidre, Kristin & Lunn, Nicholas
& Obbard, Martyn & Regehr, Eric & Thiemann,
Gregory. (2015). Ursus maritimus. The IUCN Red List
of Threatened Species 2015. https://doi.org/10.2305/IUCN.UK.2015-4.RLTS.T22823A14871490.en
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