October 1, 2008
Urban Bears Live Fast, Die Young
A life of garbage, early pregnancies and violent deaths plague big city bears
Black bears that live around urban areas weigh more, get pregnant at a younger age, and are more likely to die violent deaths, according to a study by the Wildlife Conservation Society (WCS).
Urban bears also tend to die much younger due mostly to collisions with vehicles, according to the study. All 12 urban bears tracked by the researcher were dead by age 10 due to vehicle collisions, while six of the wildland bears still survived. Bear cubs in urban areas also had dramatically higher mortality rates due mainly to vehicle collisions.
"Urban areas are becoming the ultimate bear traps," said Wildlife Conservation Society researcher Jon Beckmann, the study's lead author. "Because of an abundant food source "“ namely garbage "“ bears are being drawn in from backcountry areas into urbanized landscapes where they meet their demise."
The study warns that urbanized areas are functioning as "sinks" for black bear populations, drawing in bears from outlying wild areas, where they ultimately die. As a result, bears are failing to re-colonize outlying wild areas following this shift to urban centers.
The authors believe that without these sinks, populations of black bears in Nevada could increase. Right now, populations in Nevada remain steady due to bears immigrating from neighboring California. The Wildlife Conservation Society is studying the effects of urbanization and sprawl on a variety of wildlife and habitats in North America. WCS continues to work with local authorities to increase the use of bear-proof garbage containers and improve education efforts to reduce human-bear conflicts.
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