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body size mediated coexistence in swans.differences in body sizes may create a trade-off between foraging efficiency (foraging gains/costs) and access to resources. such a trade-off provides a potential mechanism for ecologically similar species to coexist on one resource. we explored this hypothesis for tundra (cygnus columbianus) and trumpeter swans (cygnus buccinator), a federally protected species, feeding solely on sago pondweed (stuckenia pectinata) tubers during fall staging and wintering in northern utah. foraging efficiency w ...201424672347
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