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Monitoring Thick-billed Murre Populations at Colonies in Northern Hudson Bay, 1972-92

Anthony J. GastonCanadian Wildlife Service

出版	Canadian Wildlife Service, 1993
ISBN	06622085879780662208587
URL	http://books.google.com.hk/books?id=WVG4GQ6DDBUC&hl=&source=gbs_api

註釋

In 1971, a program to monitor the status of seabirds through eastern Canada was begun. From 1975-82, baseline studies of the breeding biology of Thick-billed Murres were carried out at several colonies, including daily counts of numbers of birds present on selected study plots. The counts were repeated every few years. In addition, oblique aerial photographs were obtained of all colonies during 1972-73 and subsequently when circumstances permitted. Birds visible on the photos were counted to provide estimates of total colony size. This paper reports on the results of these monitoring observations at the East Digges and Coats Island colonies in northern Hudson Bay.