Donald S. Farner's Avian Biology. Volume 8 PDF

By Donald S. Farner

ISBN-10: 0122494083

ISBN-13: 9780122494086

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Extra info for Avian Biology. Volume 8

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In that study, most chicks were killed after intruding on neighboring territories and were not eaten. The former interpretation, of increased chick wandering, is more likely, as Hunt and McLoon (1975) showed that recently fed Glaucous-winged Gull chicks were less likely to wander. No correlation should exist between incidence of cannibalism and food availability if cannibalism represents a specialized foraging strategy adopted by a few individuals. _ __ C. CHICK KILLING AND RELATIVE FITNESS Chick killing may decrease the fitness of other individuals and thereby increase the relative fitness of the perpetrators (Pierotti, 1980).

They may find food concentrations by means of olfactory cues (R. G. B. Brown, 1980; Wenzel, 1980), through network foraging, and by means of remarkably accurate solar, magnetic, and possibly stellar navigation mechanisms (Matthews, 1968; Southern, 1980). Coloni­ ality can be advantageous as a means of information transfer only to the extent that it increases food-finding success above and beyond the success that is possible by means of other available mechanisms alone. The importance or frequency of information transfer at central colony sites is not known with any real assurance.

As a result, use of inaccessible sites renders concealment ineffective in many habitats. , herons) results from the combination of partic­ ular feeding habits and use of inaccessible nesting or roosting sites (see also Crook, 1964, 1965). Lack did not incorporate the role of these factors into an explicit hypothesis however. A more explicit hypothesis, nevertheless, can be developed from Lacks conclusions. The relationship between local population density and effec­ tiveness of concealment suggests the following argument.

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Avian Biology. Volume 8 by Donald S. Farner

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