Many non-native species have set up residence in the Obed Wild and Scenic River. A non-native is any species that occurs outside its native range as a result of deliberate or accidental introduction by humans. Non-natives compete with native species for habitat and food and often take over specialized ecosystems that rare plants or animals need to survive.
The non-native species are not natural components of the ecological system and, as a result, have not evolved in concert with the native species. Often, non-native species will not have natural predators, so their numbers will grow alarmingly. In fact, most of the successful non-natives seem to be pre-adapted to our area. This could be explained by the biological similarity between the Obed WSR and regions of Europe, East Asia, and western North America. The presence of non-native species in the Obed WSR is a detriment to the park because of the reduction in biological diversity as native populations are forced out of their environmental niches.
Hemlock Woolly Adelgids
Managing Non-native Species
Did You Know?
Did you know that the main reasons why pioneers did not settle along the Obed included difficulty in farming the inhospitable stream canyons, and the distance between the river and centers of commerce?