The Indo-European flyway: Opportunities and constraints reflected by Common Rosefinches breeding across Europe

Authors: Simeon Lisovski, Roland Neumann, Tomas Albrecht, Pavel Munclinger, Markus P. Ahola, Silke Bauer, Jaroslav Cepak, Thord Fransson, Sven Jakobsson, Tuomo Jaakkonen, Petr Klvana, Cecilia Kullberg, Toni Laaksonen, Benjamin Metzger, Markus Piha, Peter Shurulinkov, Robert Stach, Kåre Ström,William Velmala, Martins Briedis

Year: 2020

Publication: Journal of Biogeography

Publication Link: https://onlinelibrary.wiley.com/doi/full/10.1111/jbi.14085

Keywords: Carpodacus erythrinus, ecological barriers, flyways, geolocation, India, long-distance migration, migration strategies, wind support

Abstract:

Aim: The configuration of the earth’s landmasses influences global weather systems and spatiotemporal resource availability, thereby shaping biogeographical patterns and migratory routes of animals. Here, we aim to identify potential migratory barriers and corridors, as well as general migration strategies within the understudied Indo-European flyway.

Location: Europe, Central Asia.Major taxon studied: Common rosefinches.

Methods: We used a combination of theoretical optimization modelling and empirical tracking of Common Rosefinches (Carpodacus erythrinus) breeding across a large latitudinal gradient in Europe. First, we identified optimal migration routes driven by wind and resource availability along the Indo-European flyway. Second, we tracked rosefinches from five breeding populations using light-level geolocators. Finally, we
compared to what extent empirical tracks overlapped with the modelled optimal routes.

Results: In autumn, theoretical wind driven migration routes formed a broad-front corridor connecting Europe and the Indian Subcontinent while the theoretical resource driven routes formed a distinct north-south divide. The latter pattern also reflected the rosefinch tracks with all but the most southerly breeding birds making a northern detour towards non-breeding sites in Pakistan and India. In spring, the resource
availability model predicted a similar migratory divide, however, the southern route seemed relatively more favourable and closely matched with the optimal wind driven migration routes. Spring tracking data showed larger overlap with the modelled wind driven migration routes compared to the resource driven routes.

Main conclusions: Optimal wind and resource driven migration routes along the Indo-European flyway are seasonally specific and to a large extend do not overlap with one another. Under these conditions, migratory birds adopt seasonally distinct migration strategies following energy minimization strategy in autumn, driven by resource availability, and time minimizing strategy in spring, driven by wind conditions. Our optimal
migration models can be applied worldwide and used to validate against empirical data to explain large-scale biogeographic pattern of migratory animals.

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