Survival and recruitment of mallards in relation to brood size, hatching date and wetland characteristics / Elston Howard Dzus.
Material type:
TextSeries: Thesis. (Ph.D.)Publication details: Saskatoon, SK : University of Saskatchewan, 1995.Description: xii, 126 leaves : ill. ; 28 cmOnline resources: Abstract: Survival during the first year of life plays in important role in explaining life history variation of most birds. Mortality during this period is usually higher than later life stages and thus survival during early stages of life is one of the most important variables explaining lifetime reproductive success. Most aspects of the life cycle of the mallard (Anas platyrhynchos) have been well studied. My thesis focused on the least understood period of mallard life history from hatching to near independence from parental care. I evaluated survival of young in relation to brood size, hatching date, overland travel, wetland characteristics, and food abundance. Using field experiments, I evaluated whether clutch size of mallards may be limited by the parent's ability to raise offspring (parental behaviour hypothesis). Clutch and brood sizes were manipulated to form reduced, control and enlarged broods. Although sample size precluded strong statistical inference,young in enlarged and reduc
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Thesis(Ph.D)--University of Saskatchewan, 1995.
"December 1995."
Includes bibliographical references.
Survival during the first year of life plays in important role in explaining life history variation of most birds. Mortality during this period is usually higher than later life stages and thus survival during early stages of life is one of the most important variables explaining lifetime reproductive success. Most aspects of the life cycle of the mallard (Anas platyrhynchos) have been well studied. My thesis focused on the least understood period of mallard life history from hatching to near independence from parental care. I evaluated survival of young in relation to brood size, hatching date, overland travel, wetland characteristics, and food abundance. Using field experiments, I evaluated whether clutch size of mallards may be limited by the parent's ability to raise offspring (parental behaviour hypothesis). Clutch and brood sizes were manipulated to form reduced, control and enlarged broods. Although sample size precluded strong statistical inference,young in enlarged and reduc