003660000a2200121000450024500750000065000090007565000240008465000200010804100130012870000250014110000210016677300570018710aFlight costs, flight range and the stopover ecology of migrating birds14aAves14aMigraciones de aves14aEcofisiología0 aInglés1 aHouston, Alasdair I.1 aWeber, Thomas P.1 tJournal of Animal Ecology3215h3q297-306d1997g66