. The Canadian field-naturalist. 5000 Figure 1. Malpeque Bay, Prince Edward Island. population, with some, but not all, birds apparently shifting to other breeding sites. This pattern contin- ues to apply in Maritimes and Quebec colonies (per- sonal observation; personal communications from G. R. Milton, Nova Scotia Department of Natural Resources and G. Chapdelaine, A. J. Erskine, and A. R. Lock, Canadian Wildlife Service). In Lake Ontario, most cormorants continued to attend a colony which was subject to shooting during the breeding season, although surviving birds suffered a sharp decrease
. The Canadian field-naturalist. 5000 Figure 1. Malpeque Bay, Prince Edward Island. population, with some, but not all, birds apparently shifting to other breeding sites. This pattern contin- ues to apply in Maritimes and Quebec colonies (per- sonal observation; personal communications from G. R. Milton, Nova Scotia Department of Natural Resources and G. Chapdelaine, A. J. Erskine, and A. R. Lock, Canadian Wildlife Service). In Lake Ontario, most cormorants continued to attend a colony which was subject to shooting during the breeding season, although surviving birds suffered a sharp decrease in nest productivity (Ewins and Weseloh 1994).. 1984 1986 1988 1990 1992 1994 1996 Figure 2. Double-crested Cormorant populations on Ram and Little Courtin islands, Prince Edward Island. No censuses were conducted in years where symbols are absent. In Maine, cormorants generally persist in breeding at harassed colonies, but several colonies have recent- ly changed nesting islands following seasons in which Bald Eagles, Haliaeetus leucocephalus, established nearby nests and regularly raided cormorant breeding sites (R. B. Allen, personal communication). Fear of eagle predation did not figure in the shift of Ram Island cormorants to Little Courtin, as a Bald Eagle nest at the southeast tip of Big Courtin Island is 28 d/chicks hatched) Mean N Hatching Mean date Mean N N Ram Island 1994 93 304 209 9 June 10 1995 83 268 173 7 June 64 Little Courtin Island 1996 39 NA NA 6 June 61 1997 101 NA NA 10 June 95. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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