Fall Raptor Migration Count at Eagle Valley Nature Preserve in Southwest Wisconsin, 2010

摘要

The fall 2010 raptor migration count at Eagle Valley Nature Preserve, along the bluffs of the Mississippi River in southwest Wisconsin (Fig. 1), tallied the lowest count total since full-time counts began here in 1994. Spectacularly comfortable fall weather (by human standards) resulted in an unusually high number of placid days which might have expanded the migration corridor, laterally and vertically, resulting in a greater proportion of raptors passing out of our view. The inactive weather also resulted in fewer major waves of migration typically seen following periods of cool, wet weather.