Population delineation and wintering ground influence on vital rates of white-winged scoters / Cindy Jean Swoboda.
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TextPublication details: Saskatoon, SK : University of Saskatchewan, 2007.Description: viii, 72 leaves : ill., maps ; 28 cmOnline resources: Summary: North American populations of white-winged scoters (Melanitta fusca deglandi) have declined markedly over the past several decades. The causes for decline are uncertain, but likely involve a complexity of events occurring on wintering and breeding areas. To gain insight into potential cross-seasonal effects, I delineated Atlantic and Pacific wintering scoter populations and linked them to a shared breeding area using stable isotope analysis of carbon (13C) and nitrogen (15N) ratios in feathers. By applying this methodology to a marked breeding population at Redberry Lake, Saskatchewan, I assigned females to putative wintering areas and determined: (1) population structure; (2)the extent of winter site philopatry; and, (3) differences in vital rates and other variates in relation to winter origin.
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Thesis(M.Sc.)--University of Saskatchewan, 2007.
Includes bibliographical references.
North American populations of white-winged scoters (Melanitta fusca deglandi) have declined markedly over the past several decades. The causes for decline are uncertain, but likely involve a complexity of events occurring on wintering and breeding areas. To gain insight into potential cross-seasonal effects, I delineated Atlantic and Pacific wintering scoter populations and linked them to a shared breeding area using stable isotope analysis of carbon (13C) and nitrogen (15N) ratios in feathers. By applying this methodology to a marked breeding population at Redberry Lake, Saskatchewan, I assigned females to putative wintering areas and determined: (1) population structure; (2)the extent of winter site philopatry; and, (3) differences in vital rates and other variates in relation to winter origin.