Barrier crossings and winds shape daily travel schedules and speeds of a flight generalist

Maurizio Sara', Jesús Hernández-Pliego, Wouter M. G. Vansteelant, Lina Lopez-Ricaurte, Ana Bermejo-Bermejo, Susana Casado, Daniel García-Silveira, Juan Martínez-Dalmau, Fernando Garcés-Toledano, Beatriz Rodríguez-Moreno, Alfredo Ortega, Jacopo G. Cecere, Diego Rubolini, Javier De La Puente, Javier Bustamante

Risultato della ricerca: Articlepeer review

Abstract

External factors such as geography and weather strongly affect bird migration influencing daily travel schedules and flight speeds. For strictly thermal-soaring migrants, weather explains most seasonal and regional differences in speed. Flight generalists, which alternate between soaring and flapping flight, are expected to be less dependent on weather, and daily travel schedules are likely to be strongly influenced by geography and internal factors such as sex. We GPS-tracked the migration of 70 lesser kestrels (Falco naumanni) to estimate the relative importance of external factors (wind, geography), internal factors (sex) and season, and the extent to which they explain variation in travel speed, distance, and duration. Our results show that geography and tailwind are important factors in explaining variation in daily travel schedules and speeds. We found that wind explained most of the seasonal differences in travel speed. In both seasons, lesser kestrels sprinted across ecological barriers and frequently migrated during the day and night. Conversely, they travelled at a slower pace and mainly during the day over non-barriers. Our results highlighted that external factors far outweighed internal factors and season in explaining variation in migratory behaviour of a flight generalist, despite its ability to switch between flight modes.
Lingua originaleEnglish
pagine (da-a)1-12
Numero di pagine12
RivistaScientific Reports
Volume11
Stato di pubblicazionePublished - 2021

All Science Journal Classification (ASJC) codes

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