TABLE OF CONTENTS 



Page 



PREFACE iii 



EXECUTIVE SUMMARY iv 



TABLE OF CONTENTS vi 



TABLES ix 



FIGURES xii 



ACKNOWLEDGMENTS xiv 



ABSTRACT xv 



KEY WORDS xvi 



INTRODUCTION 1 



COLONIAL WATERBIRD INVENTORY RESULTS-1977 3 



BREEDING ABUNDANCE 3 



HABITAT UTILIZATION 30 



METHODS OF ASSESSING BREEDING POPULATION SIZE. 34 



SAMPLING METHODS "WITHIN COLONY" 35 



LARGE-SCALE, "AMONG COLONY" METHODS OF ASSESSING 



POPULATION SIZE 38 



Efficiency of Aerial and Ground Methods 40 



Aerial -Ground Comparisons 42 



Species Correction Factors (Aerial-Ground) 44 



Aerial Photography 50 



POPULATION TRENDS OF WATERBIRDS, 1900-1977 53 



MAINE 54 



Seabirds 54 



Wading Birds 54 



ISLES OF SHOALS (MAINE-NEW HAMPSHIRE) 57 



Seabirds 57 



Wading Birds 57 



MASSACHUSETTS 59 



Seabirds 59 



Wading Birds 61 



VI 



