The Pacific Northwest as an emerging beachhead of crayfish invasions скачать в хорошем качестве

The Pacific Northwest as an emerging beachhead of crayfish invasions

Speaker: Julian D. Olden | School of Aquatic and Fishery Sciences | University of Washington, Seattle Crayfish are among the most widely introduced freshwater taxa worldwide, yet still have a relatively recent history in parts of western North America. Following their introduction, invasive crayfish can impart ecological impacts across entire ecosystems due to their poly-trophic feeding habits and potential to spread rapidly and reach extremely high local abundances. However, despite continued invasion and mounting ecological impacts, effective management of nonnative crayfish is still challenged by limited funding and inadequate forecasting tools. Here I review the current state of knowledge on nonnative crayfish distributions and impacts in western states, and describe known and emergent approaches for monitoring, forecasting, and managing their invasion. To illustrate the risks, challenges, and opportunities involved in managing invasive crayfish, I highlight one notable case: the invasion of rusty crayfish, Faxonius rusticus, in the John Day River, Oregon, a major tributary of the Columbia River.