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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%) ... -
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 ... -
Body condition of gray partridge (Perdix perdix) during fall and winter in Saskatchewan
(1983)During August 1979 to March 1980, 118 Gray Partridge were collected from a 207[superscript 2] km study area near Tugaske, Saskatchewan. Temperature and snowpack information were monitored throughout the study period. ... -
Effect of body condition on reproductive performance and secondary sex ratios in ring-billed gulls (Larus delawarensis)
(1986)Nesting Ring-billed Gulls (Larus delawarensis) were studied on Granite Island, northern Lake Superior, during the breeding seasons of 1983 and 1984 to determine if there was a relationship between food supply and the ... -
Effects of manual, mechanical, and aerial herbicide conifer release on songbird numbers in regenerating spruce plantations in Northwestern Ontario
(1997)This study examined the effects of conifer release with herbicides [Vision® (glyphosate) ], [Release® (triclopyr) ] , and proposed alternatives to herbicides with manual brush saws and mechanical brushsaws, on breeding ... -
Nesting ecology of a population of red-necked grebes in Northwestern Ontario
(2001)One of the largest, documented breeding populations of Red-necked Grebes (Podiceps grisegena holboelli) in the world was studied at Whitefish Lake, Ontario in 1993 and 1994. Whitefish Lake (WFL) represents a unique area ... -
Relationship of body size to time of nesting and mate preference in the Ring-billed Gull (Larus delawarensis)
(1988)The first part of this thesis investigated the relationship between time of nesting and body size in Ring-billed Gulls (Larus delawarensis). There were no significant differences in skeletal measurements among birds ... -
Reproductive performance of Ring-billed gulls in relation to nest location
(1978)Reproductive performance of Ring-billed Gulls (Larus delawarensis) in relation to nest location was investigated on Granite Island, northern Lake Superior, in 1976 and 1977. To determine whether any differences existed in ...