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Willamette Valley Wetland Amphibian Survey 1999, 2000, 2001


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Microsoft Access database containing information on a three-year survey of amphibians in the Willamette Valley, Oregon. The data include site description and conditions, trap and dip net capture information.


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Wetland management and land use planning have important consequences for the persistence of wetland-associated fauna. Wetland hydrology, particularly the persistence of surface water through the year, affects nutrient levels, soil hdyrogeomorphology (HGM), and the numbers and types of organisms that form a wetland community. There is a critical need for landscape-scale analyses of wetland biodiversity in the rapidly changing Willamette Valley and Puget Lowlands. Research in other regions suggest that land use trends that result in habitat loss, hydrological alterations, and changes in connectivity have negative impacts on aquatic fauna such as amphibians . In addition to direct habitat loss, there is a general trend of replacement of shallow, ephemeral wetlands with deep, permanent ponds that may encourage the expansion of exotic species that rely on permanent water . Altered hydrology and invasion by exotics are considered by many aquatic ecologists to be the two greatest threats to the freshwater fauna of western North America. This research addresses the properties of freshwater wetlands that are important to native amphibian communities and the role that exotic predators play in those communities, specifically as they apply to wetland management and conservation practices. By identifying physical characteristics of wetlands that are affected by regional patterns in land use and management, and by elucidating the processes that link these patterns to wetland faunal communities, we can better predict the regional faunal response to increasing anthropogenic impacts.



  • Forest and Rangeland Ecosystem Science Center (FRESC)



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