Nutrient reserves and diet of breeding mallards and blue-winged teal / Andrew D. Young.
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TextPublication details: London, ON : University of Western Ontario, 1991.Description: xv, 144 leaves : ill. ; 28 cmOnline resources: Abstract: Mallards (Anas platyrhynchos; n=339) and blue-winged teal (A. discors;n=213; hereafter teal) were collected from western (1986) and eastern (1987) Saskatchewan grassland and parkland habitats during egg formation to examine body composition, diets and digestive organ size with respect to hypotheses concerning habitat (this study) and the use of body fat (Drobney 1980; Rohwer 1986a; Ankney and Afton 1988). I predicted that ducks breeding in grassland habitats would rely upon more stored body nutrients, whereas parkland ducks would rely more upon dietary nutrients to form eggs. Body composition including fat, protein and mineral reserves and digestive organ sizes and diets (used to index food consumption) did not differ due to habitat in Mallards or teal. Female mallard breeding at the western grassland site used 60% less body fat during clutch formation compared with females from other sites. Two potential explanations for this are: a) food resources at this site were annually most pr
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Thesis(Ph.D.)--University of Western Ontario, 1991.
Mallards (Anas platyrhynchos; n=339) and blue-winged teal (A. discors;n=213; hereafter teal) were collected from western (1986) and eastern (1987) Saskatchewan grassland and parkland habitats during egg formation to examine body composition, diets and digestive organ size with respect to hypotheses concerning habitat (this study) and the use of body fat (Drobney 1980; Rohwer 1986a; Ankney and Afton 1988). I predicted that ducks breeding in grassland habitats would rely upon more stored body nutrients, whereas parkland ducks would rely more upon dietary nutrients to form eggs. Body composition including fat, protein and mineral reserves and digestive organ sizes and diets (used to index food consumption) did not differ due to habitat in Mallards or teal. Female mallard breeding at the western grassland site used 60% less body fat during clutch formation compared with females from other sites. Two potential explanations for this are: a) food resources at this site were annually most pr