期刊
ENDANGERED SPECIES RESEARCH
卷 46, 期 -, 页码 105-120出版社
INTER-RESEARCH
DOI: 10.3354/esr01148
关键词
Genetic mark-recapture-recovery; Polar bear; Baffin Bay; Abundance; Survival; Biopsy; Ursus maritimus
资金
- Air Greenland, Applied Physics Laboratory (University of Washington)
- Avannaa Resources Inc. (Copenhagen)
- Canada Department of National Defense, Environment and Climate Change Canada, Environmental Protection Agency (Ministry of Environment and Food of Denmark) -DANCEA Programme, Government of Nunavut
- Greenland Department of Fisheries, Hunting and Agriculture (DFHA)
- Greenland Institute of Natural Resources, Greenland Pharmaceutical Authority (Nuuk)
- Hospital in Upernavik-Peqqik, KNAPK (Greenland Hunters and Fishermen Organization)
- Kullorsuaq School, Laso ApS (Upernavik)
- Mitteqarfik airport in Qaarsut
- Mitteqarfik airport in Upernavik
- Mittimatalik Hunters and Trappers Organization
- National Aeronautical and Space Agency (NASA) Development and Testing of Potential Indicators for the National Climate Assessment program [NNX13AN28G]
- NASA Climate and Biological Response [NNX11A063G]
- Namautaq Hunters and Trappers Organization
- Nativak Hunters and Trappers Organization
- Nunavut Wildlife Management Board
- Parks Canada Agency
- Polar Continental Shelf Project
- Polar Science Center (University of Washington)
- Qaanaap Kommunia
- Qikiqtaaluk Corporation
- Quantum Murray LP
- School of Aquatic and Fishery Sciences (University of Washington)
- Thule Air Force Base (Base Commander, US Air Force and Danish Liaison Officer, Danish Navy)
- Universal Helicopters
- University of Oslo
- Upernavik Seafood
- Uummannaq Sundhedscenter-Peqqik
- Vetlesen Foundation
- World Wildlife Fund
Changes in sea-ice dynamics are impacting polar bears' demography and survival rates, with the Baffin Bay subpopulation estimated at 2826 individuals and annual survival rates of 0.90 and 0.78 for females and males, respectively. The study demonstrates the practicality of genetic sampling for assessing polar bear populations over large spatial and temporal scales.
Changes in sea-ice dynamics are affecting polar bears Ursus maritimus across their circumpolar range, which highlights the importance of periodic demographic assessments to inform management and conservation. We used genetic mark-recapture-recovery to derive estimates of abundance and survival for the Baffin Bay (BB) polar bear subpopulation-the first time this method has been used successfully for this species. Genetic data from tissue samples we collected via biopsy darting were combined with historical physical capture and harvest recovery data. The combined data set consisted of 1410 genetic samples (2011-2013), 914 physical captures (1993-1995, 1997), and 234 harvest returns of marked bears (1993-2013). The estimate of mean subpopulation abundance was 2826 (95% CI = 2284-3367) in 2012-2013. Estimates of annual survival (mean +/- SE) were 0.90 +/- 0.05 and 0.78 +/- 0.06 for females and males age >= 2 yr, respectively. The proportion of total mortality of adult females and males that was attributed to legal harvest was 0.16 +/- 0.05 and 0.26 +/- 0.06, respectively. Remote sensing sea-ice data, telemetry data, and spatial distribution of onshore sampling indicated that polar bears were more likely to use offshore sea-ice habitat during the 1990s sampling period compared to the 2010s. Furthermore, in the 1990s, sampling of deep fjords and inland areas was limited, and no offshore sampling occurred in either time period, which precluded comparisons of abundance between the 1993-1997 and 2011-2013 study periods. Our findings demonstrate that genetic sampling can be a practical method for demographic assessment of polar bears over large spatial and temporal scales.
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