A portion of the wetlands of the
Columbia Valley have received at least some degree of protection
under various statutes. The Creston Valley Wildlife Management Area
(joint federal, provincial, private), four national wildlife areas,
four provincial wildlife management areas, and numerous small unofficial
wildlife management areas collectively protect about 82,720 ha.
of these important wetlands. It should be noted, however, that public
and commercial recreation, hunting, trapping, logging and mining
are still permitted on much of these lands. While some wildlife
and plant species may be able to tolerate such disturbances, clearly
others cannot. Although some species may receive protection, overall
biodiversity protection cannot be guaranteed under such a management
regime.
In addition to direct short-term
threats from human disturbances, Columbia Basin wetlands face a
growing impact from global warming. Small changes in hydrological
regime often result in large changes in plant community structure
and complete elimination of certain habitats and species. Many wetland
species can only tolerate minor changes in nutrient flux and water
levels. Global warming will increase demands for human water supply
with consequent effects on wetlands. Wetlands are also often seen
as good sites for future agricultural production (Hebda, 1994).
Perhaps the greatest immediate threat
to wetlands in the basin is the fluctuating water levels associated
with the reservoirs. Rapid inundation and/or depletion of water
may completely destroy nesting or spawning habitats for a wide range
of species.