Resource type
Thesis type
(Thesis) M.Sc.
Date created
2005
Authors/Contributors
Author: Mathot, Kimberley Jean
Abstract
I examined relationships between bill morphology, feeding behaviour and nonbreeding distribution in a sexually dimorphic shorebird, the Western Sandpiper (Calidris mauri). The sexes are differentially distributed across the non-breeding range, with males, the shorter-billed sex, shifted north relative to females. Males are more reliant on pecking (surface feeding) during both migration and the non-breeding period while females do more probing (subsurface feeding). I tested whether differences in feeding mode result in sex-related differences in diet. Results of surficial food removal plots and stable isotope analyses were equivocal. I also tested the hypothesis that latitudinal gradients in the vertical distribution of food (invertebrates and biofilm) underlie differential migration in Western Sandpipers. Surface food predominated at northern sites, while subsurface food predominated at southern sites. This study is the first to relate latitudinal scale changes in the distribution of food to functional morphology and differential non-breeding distribution in a shorebird.
Document
Copyright statement
Copyright is held by the author.
Scholarly level
Language
English
Member of collection
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