Mhimeuicanjiuseum PUBLISHED by the AMERICAN MUSEUM of NATURAL HISTORY CENTRAL PARK WEST at 79TH STREET, NEW YORK 24, N.Y
1ovitatesMhimeuicanJiuseum PUBLISHED BY THE AMERICAN MUSEUM OF NATURAL HISTORY CENTRAL PARK WEST AT 79TH STREET, NEW YORK 24, N.Y. NUMBER 2 028 MAY 8, 196I Birds of the Western Slope of the Andes of Peru1 BY MARIA KOEPCKE2 INTRODUCTION During the ecological and zoogeographical studies that I undertook with my husband, H.-W. Koepcke, in the course of nine years on the western side ofthe Peruvian Andes, I observed that a considerable num- ber of birds have a more extensive distribution than had been known heretofore. It had not been perceived that several life zones ofnorthwest- ern Peru and western Ecuador, with their special biotopes, extend along the western slope of the Andes to middle Peru and beyond. The most interesting findings seem to be that the humid division of the temperate zone described by Chapman (1926) for Ecuador and northwestern Peru extends at least to middle Peru, split into a chain of "insular woods" (M. Koepcke, 1954, 1957, 1958; H.-W. Koepcke, 1958, and MS), and, moreover, the fact that we find in middle Peru, in the lower part of the western Andean slope, the southernmost patches of forest composed of trees which shed their leaves during the dry season. I have included a few observations on birds of the ocean shores and on migratory birds. I found further novelties in relation to distribution during a revision of Peruvian birds in the American Museum of Natural History in New 'Taxonomical and faunal bases for the ecological-zoogeographical studies of H.-W. and M. Koepcke, No. 27, with support from the Deutsche Forschungsgemeinschaft, Bad Godes- berg, Germany.
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