engleski

Bear reintroductions: lessons and challenges

Reintroduction is defined as an attempt to establish a species in an area that was once part of its historical range, but from which it has been extirpated or become extinct. When native conspecifics are already present, reintroductions are sometimes referred to as augmentation. Interest in bear reintroduction has increased in recent years. Historically, one of the most successful programs was the reintroduction of 254 American black bears (Ursus americanus) from Minnesota to the Interior Highlands of Arkansas in the 1960s ; that population has grown to >2, 500 today. More recent efforts have involved fewer but better monitored animals and have sometimes employed techniques to improve site fidelity and survival. In Pennsylvania, for example, pregnant female American black bears were successfully translocated from winter dens, the premise being that the adult females would be less likely to return because of the presence of young cubs. That winter-release technique was compared to summer trapping and release in Tennessee ; winter releases resulted in greater survival and reduced post-release movements. Homing has not been a problem for small numbers of brown bears (Ursus arctos) reintroduced to the Cabinet-Yaak ecosystem in Montana and Idaho and to the mountains of Austria and France. As with any small population, reintroduced populations are susceptible to environmental variation and stochastic demographic and genetic processes. Reintroduction success appears to be correlated with translocation distance. Subadults and females may be the most suitable candidates for reintroduction. Although managers have focused on the biological barriers to bear reintroduction, sociopolitical impediments to bear reintroduction are more difficult to overcome. Poor public acceptance and understanding of bears are the main reasons some reintroduction programs have been derailed. Consequently, the public should be involved in the reintroduction process from the outset ; overcoming negative public perceptions about bear reintroduction will be our greatest challenge

bear ; reestablisment ; reintroduction ; restoration ; translocation ; Ursus americanus ; Ursus arctos

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