Seasonal Differences in Migration Counts of Raptors: Utility of Spring Counts for Population Monitoring

摘要: Abstract Long-term monitoring is important for ensuring effective conservation of raptor populations. Raptors also can serve as indicators biodiversity and ecosystem condition. Therefore, populations yields the added benefit helping to evaluate status ecosystems. Spring counts migrating raptors at concentration points may contribute these goals, particularly by providing insight into vital demographic rates underlying population trends. Although much known about value autumn migration in North America, little research has addressed spring counts. We compared seven watchsites those matched region (Southwest, Great Lakes, Northeast) assess monitoring. Our analyses suggested that indexes derived from provided estimates change differed overall ...