RESEARCH ARTICLE Movement patterns of an avian generalist predator indicate functional heterogeneity in agricultural landscape U ¨ lo Va ¨li . Pawel Mirski . Gunnar Sein . Urmas Abel . Grete To ˜nisalu . Urmas Sellis Received: 14 January 2020 / Accepted: 26 May 2020 Ó Springer Nature B.V. 2020 Abstract Context Biodiversity is closely related to landscape heterogeneity, but both are difficult to evaluate directly. Apex predators, such as raptors, are potential surrogate indicators of diversity, but previous studies using a correlative approach have been heavily criticised. Objectives We evaluated whether space use by a generalist avian predator, the lesser spotted eagle Clanga pomarina, is an effective indicator of func- tional landscape heterogeneity and evaluate mecha- nisms driving this relationship. Methods We used GPS-tracking of eagles over eight breeding seasons along with precise field mapping data for broad and detailed land-use types from Estonia, Eastern Europe. We analysed the effects of various landscape metrics and composition on move- ment patterns of eagles. Results Activity centres of eagles were associated with configurational heterogeneity, as evidenced by their foraging on the edges of small complex patches more often than expected at random. The eagles also avoided roads (disturbance) and preferred forest edges (ecotones with abundant prey and perch sites). The importance of compositional heterogeneity was revealed by preferences for specific land-use types (e.g. spring-sown but not autumn-sown wheat); pre- ferred crops changed over time. The model including only general land-use classes was outperformed by the model based on a detailed classification. Conclusions Movement ecology provides an oppor- tunity to biomonitor the heterogeneity of landscapes and adds a functional perspective to earlier raptor- biodiversity correlation studies. This suggests that in addition to GPS-tracking, large quantities of oppor- tunistic observations by citizen scientists can be used to evaluate biodiversity across landscapes. Keywords Bioindicators Á Farmland heterogeneity Á Lesser spotted eagle Á Movement ecology Á Spatial behaviour Á Surrogate species Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10980-020-01043-3) con- tains supplementary material, which is available to authorized users. U ¨ . Va ¨li (&) Á P. Mirski Á U. Abel Á G. To ˜nisalu Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 5, 51014 Tartu, Estonia e-mail: ulo.vali@emu.ee U ¨ . Va ¨li Á G. Sein Á U. Abel Á U. Sellis Eagle Club, Hauka, Kanepi, 63406 Po ˜lvamaa, Estonia G. Sein Environmental Board, Roheline 64, 80010 Pa ¨rnu, Estonia 123 Landscape Ecol https://doi.org/10.1007/s10980-020-01043-3