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Article

Does body size influence nest attendance? A comparison of Ross's geese (Chen rossii) and the larger, sympatric lesser snow geese (C-caerulescens caerulescens)

Jón Einar Jónsson, Auteur ; Alan D. Afton, Auteur ; Ray T. Alisauskas, Auteur

Dans Journal of Ornithology (148(4) OCT 2007)

The body-size hypothesis predicts that nest attendance is positively related to body size among waterfowl and that recess duration is inversely related to body size. Several physiological and behavioral characteristics of Ross's geese (Chen ross[...]

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Article

Genetic differentiation between sympatric and allopatric wintering populations of snow geese

Elizabeth M. Humphries, Auteur ; Jeffrey L. Peters, Auteur ; Jón E. Jónsson, Auteur ; Roger Stone, Auteur ; Alan D. Afton, Auteur ; Kevin E. Omland, Auteur

Dans Wilson Journal of Ornithology (The) (121(4) 2009)

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Movements and survival of Lesser Snow Geese Chen caerulescens caerulescens wintering in two habitats along the Gulf Coast, Louisiana

Jón Einar Jónsson, Auteur ; Morten Frederiksen, Auteur ; Alan D. Afton, Auteur

Dans Wildfowl (64 2014)

Lesser Snow Geese Chen caerukscens caerulescens (hereafter Snow Geese) use two wintering habitats in southwest Louisiana. Snow Geese in coastal marshes generally have larger bodies and proportionally thicker bills, longer skulls and longer culme[...]

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Article

Time budgets of Snow Geese Chen caerulescens and Ross's Geese Chen rossii in mixed flocks: implications of body size, ambient temperature and family associations

Jón Einar Jónsson, Auteur ; Alan D. Afton, Auteur

Dans Ibis (151(1) JAN 2009)

Body size affects foraging and forage intake rates directly via energetic processes and indirectly through interactions with social status and social behaviour. Ambient temperature has a relatively greater effect on the energetics of smaller spe[...]

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