Diving Birds of North America: 4 Comparative Diets and Foraging EcologiesDiving Birds of North America, by Paul Johnsgard
Date of this Version4-1-1987
AbstractAuks, loons, and grebes are birds whose anatomies and behaviors have been sharply influenced by their foraging niche adaptations. In each species these have evolved through natural selection over extended periods of geologic time as a reflection of available food resources, the presence of competing species, and the limitations on innate variations in anatomy, physiology, and behavior imposed by available genetic mutations and recombinations. To a very considerable degree the auks, loons, and grebes seem to have adjusted to the effects of interspecific competition by evolving differences in bill shape and body size that sometimes open specific new foraging niche opportunities to them and thus reduce direct competition with other species of their group.
Citation InformationPaul A. Johnsgard. "Diving Birds of North America: 4 Comparative Diets and Foraging Ecologies" (1987)
Available at: http://works.bepress.com/paul_johnsgard/282/