Titlebook: Bird Migration; Physiology and Ecoph Eberhard Gwinner Conference proceedings 1990 Springer-Verlag Berlin Heidelberg 1990 Vogelflug.Vogelphy

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Some Ecological Aspects of Migrants and Residentspecies of tropical origin only temporarily visiting these breeding grounds (see review in Morse 1980). The importance of reproduction and survival rates and of migration costs in the evolution of migration has also received greater attention recently (Ketterson and Nolan 1976, 1983; Fretwell 1972, 1985; Greenberg 1980; O’Connor 1981, 1985).

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Nutrition and Food Selection in Migratory Birdsng migrants must choose from a broad range of foods differing in morphology and nutrient contents. In this chapter, I will review nutritional adaptations and aspects of food selection in migrants which appear to correspond to their migratory requirements.

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Kapitel: Allgemeine Grundrechtslehrenolting area usually differed from — and might even be opposite to — that to the wintering grounds; (2) all age and sex classes might not participate, (3) molting sites were highly localized; and (4) the numbers and densities of birds involved were often higher than at any other time.

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Kapitel: Die Gerichtsbarkeit des Bundesstates have common requirements, e.g., for hyperphagia, fat deposition (as fuel for long flights), and migratory flight itself. Thus, it is likely that some of the regulatory mechanisms of migration will be similar in spring and autumn and others different.

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