Raymond H. G. Klaassen

TL;DR: It is suggested that events during the migration seasons have an important impact on the population dynamics of long-distance migrants, and mortality during spring migration may account for short-term annual variation in survival and population sizes, while mortality during autumn migration may be more important for long-term population regulation.

TL;DR: Measurements from tracking studies found a consistent predominance of cases showing higher speeds and shorter durations during spring compared to autumn, in terms of flight speeds, ground speed, daily travel speed, stopover duration, and total speed and duration of migration.

TL;DR: In this paper, the authors investigated the influence of different calibration methods on the accuracy of the latitudinal positions of geolocators, and demonstrated their effect on the measurement of day and night length, time of solar midnight ⁄ noon and the resulting position estimates using light measurements from stationary geolocalators at known places and from geocators mounted on birds.

TL;DR: This work presents a classification of responses based on the direction of the resulting movement relative to flow and preferred direction, which is applicable to a range of taxa and environments.

TL;DR: It is demonstrated the existence of fundamentally different spatio-temporal migration strategies used by the birds during autumn and spring migration, and that songbirds may rely on distinct staging areas for completion of their annual cycle, suggesting more sophisticated endogenous control mechanisms than merely clock-and-compass guidance among terrestrial solitary migrants.