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A Quantitative Study of the Nocturnal Migration of

A Quantitative Study of the Nocturnal Migration of Birds

BY

GEORGE H. LOWERY, JR.

University of Kansas Publications Museum of Natural History

Volume 3, No. 2, pp. 361-472, 47 figures in text June 29, 1951

University of Kansas LAWRENCE 1951

UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY

Editors: E. Raymond Hall, Chairman; A. Byron Leonard, Edward H. Taylor, Robert W. Wilson

UNIVERSITY OF KANSAS Lawrence, Kansas

PRINTED BY FERD VOILAND, JR., STATE PRINTER TOPEKA, KANSAS 1951

[Union Label]

23-1020

A Quantitative Study of the Nocturnal Migration of Birds

By

GEORGE H. LOWERY, JR.

CONTENTS

Page

INTRODUCTION 365

ACKNOWLEDGMENTS 367

PART I. FLIGHT DENSITIES AND THEIR DETERMINATION 370

Lunar Observations of Birds and the Flight Density Concept 370

Observational Procedure and the Processing of Data 390

PART II. THE NATURE OF NOCTURNAL MIGRATION 408

Horizontal Distribution of Birds on Narrow Fronts 409

Density as a Function of the Hour of the Night 413

Migration in Relation to Topography 424

Geographical Factors and the Continental Density Pattern 432

Migration and Meteorological Conditions 453

CONCLUSIONS 469

LITERATURE CITED 470

LIST OF FIGURES

Figure Page

1. The field of observation as it appears to the observer 374


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