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

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Kapitel: Verfassung und Verfassungsrecht Perkinson 1951; King and Farner 1956; Berthold 1976; Blem 1976, 1980; Dawson et al. 1983). The basic biochemistry, physiology, and bioenergetics of migratory fattening have been identified; yet, the regulatory mechanisms involved remain obscure. On the one hand, the behavioral and physiological fun

chance

Kapitel: Die Gerichtsbarkeit des Bundesment of individuals from the wintering area to the breeding area) occurs during a period of gonadal development and increasing levels of reproductive hormones. Autumnal migration (the movement of individuals from the breeding area to wintering grounds) occurs after the breeding season when the gonad

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Kapitel: Verfassung und Verfassungsrecht and homing by pigeons. We suggest that analogies between these findings and site recognition in migratory birds may indicate new directions for research. These suggestions are speculative because current knowledge is slim; we hope the speculations may have heuristic value.

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Kapitel: Die Gerichtsbarkeit des Bundes period (e.g., Berthold 1988a). The overall winter distributions of many migrant species are well known, but detailed analyses of population structure, ecology, and physiology during this period are scarce.

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Kapitel: Die einzelnen Grundrechtes do not (Schüz 1971). This situation is referred to as partial migration (Schüz and Meise 1968). The définition should not be used for . that migrate in part of their breeding range and are sedentary elsewhere (Terrill and Able 1988).

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wide billions of birds leave their breeding grounds every autumn to migrate to areas with seasonally more favor­ able conditions. Many of these migrants travel only over a few hundred kilo­ meters but others cover distances equivalent to the circumference of the earth. Among these long-distance migr

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Kurzprofil wichtiger Medikamente,w hundred kilometers but others cover distances equivalent to the circumference of the earth. Among these long-distance migrants are several billion birds that invade Africa every autumn from their West and Central Palaearctic breeding areas. In the Americas and in Asia the scope of bird migration is of a similar magnitude.

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Kapitel: Allgemeine Grundrechtslehrenme widely used, providing a partial solution to the problem of quantifying and separating the effects of interrelated weather variables on migration. Work up to 1977 was reviewed by Richardson (1978a), hereafter cited as R78a.