Federal Register - June 1, 2021
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Source: Federal Register
Federal Register / Vol. 86, No. 103 / Tuesday, June 1, 2021 / Proposed Rules
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Distance to polar bears when encountered
20-
15-
1=
::J
0
0
10-
oI
I
0
2000
I
I
6000
4000
Distance to Bear m
Figure 4-Distribution of polar bear encounters on the North Slope of Alaska in the period 2014-2018 by distance to bear m.
Using this information, we buffered the 24-hour occupancy locations listed above by 1.6 km 1 mi and calculated an overall search area for both the coastal and inland zones. The coastal
and inland occupancy buffer shapefiles were then used to select encounter records that were associated with 24hour occupancy locations, resulting in the number of bears encountered per
zone. These numbers were then separated into open-water and ice seasons Table 2.
TABLE 2SUMMARY OF ENCOUNTERS OF POLAR BEARS ON THE NORTH SLOPE OF ALASKA IN THE PERIOD 20142018
WITHIN 1.6 KM 1 MI OF THE 24-HOUR OCCUPANCY LOCATIONS AND SUBSEQUENT ENCOUNTER RATES FOR COASTAL a AND INLAND b ZONES
Open-water season encounters
Ice season encounters
Year A Coastal Zone Area = 133 km2
2014
2015
2016
2017
2018
Average
2
8
4
7
13
6.8
193
49
227
313
205
197.4
Seasonal Encounter Rate
0.05 bears/km2
1.48 bears/km2
2014
2015
2016
2017
2018
Average
3
0
0
3
0
1.2
3
0
2
0
2
1.4
Seasonal Encounter Rate
0.004 bears/km2
0.005 bears/km2
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B Inland Zone Area = 267 km2
