The major proximate threats facing bears are probably:
1) Excessive human caused mortality through
direct killing (legal control permits or poaching), often motivated by
conflicts, or from traffic accidents. Capture of wild cubs to become dancing
bears has been a frequent problem in the Balkans in the past, but appears to
have been stopped.
2) Fragmentation of habitat due to
habitat destruction or the construction of roads and other barriers. In Europe,
bear distribution is tightly linked to forest cover, and only forested areas can
host bear populations or serve as dispersal corridors. These need to be
identified and protected.
3) Infrastructure. Continental Europe
is a crowded continent, with a very extensive infrastructure system of
high-speed highways and railways. In some regions (e.g. Spain and Slovenia)
these hinder contact between populations and contribute to bear mortality.
Efforts to build underpasses or overpasses (so called "Green bridges")
appear to have been successful, for example in Croatia.
4) Habitat degradation. Forestry
practices can have varying affects on bear populations. In the boreal forest
habitats of Scandinavia, clear-cut logging has had no major effects on bears
(see articles by Swenson et al.), however, in more deciduous forests
where mast is an important food source, any changes to the forest composition
could have more severe effects. However, a major threat from forestry also lies
in the increased human access to bear habitats resulting from road construction,
as well as through habitat change.
5) Artificial food sources are often
exploited by bears. These include feedings sites to aid in hunting and human
garbage disposal sites. Although such food sites are an important part of the
management strategy of countries such as Slovenia, frequent use of these sites
by bears may lead to habituation and the development of problem behaviours.
6) The demographic and genetic viability
of the smallest remnant populations is probably very low because of their small
size and isolation.
7) Public attitude will greatly influence
the future for bears in Europe. Bear management that has negative effects on
people will not be successful in the long run. Human dimensions research and
public education programs are starting to become an important part in the
conservation programs of most European countries that contain bears. Public
involvement in management will also become more relevant in the future.
8) Fragmentation of management authority is
a potential danger for species that occur at low population density and roam
over large home ranges. With increasing democracy there is a tendency to pass
more responsibility for wildlife management down to more local levels. Without
effective co-ordination this can lead to severe problems for population level
management. Effective bear conservation requires co-operation that covers
administrative units at all scales, including the international level.
9) Insufficient monitoring of bears. Legal
harvest of bears need not be a threat to population viability if properly
managed, and is probably not a problem for any of the European populations at
present. The increasing availability of population specific scientific knowledge
should improve management in general. However, the most important issue of
developing effective monitoring programs is hampered by the intrinsic
difficulties in monitoring bear populations (Linnell et al., 1998).