| http://www.w3.org/ns/prov#value | - Yet despite studies of numerous species at their breeding grounds, wintering grounds, and (to a lesser degree) stopover sites, no one can say with confidence the degree to which the observed declines are a function of the loss of breeding habitat, the loss of winter habitat, heightened mortality during migration (due to habitat destruction, pesticides, communications towers, and other factors), or
|
