Ridge and Valley physiographic region, Sauer et al. (2005) reported
annual declines over this period of 8% for the rosebreasted
grosbeak, 5% for the eastern wood-pewee, and 2%
for the wood thrush. These three species had declining trends
in all three treatments during our study (Table 2). As with
range-wide population declines of long-distance migrant
breeding birds in Europe, declines of Nearctic-Neotropical migrants
are likely affected by habitat loss and other challenges
on the wintering grounds, possibly more so than changes on
the breeding grounds (Sanderson et al., 2006).