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Biology of "peak" and "late" nesting Ring-billed gulls, Granite Island, Lake Superior
(1982)
Late-nesting Ring-billed Gulls in this study laid fewer
and smaller eggs and hatched fewer young than earlier nesting
pairs. Birds nesting late in the season appeared to lack
sufficient stimuli for incubation, as indicated ...
Behaviour and reproductive success of female-female pairs of Ring-billed gulls (Larus delawarenis), Granite Island
(1982)
Female-female pairs of Ring-billed Gulls were studied on
Granite Island, northern Lake Superior, during the breeding
seasons of 1979 and 1980. In 1979 the colony consisted of approximately
2400 pairs with 99 nests (4.1%) ...