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Population-specific assessment of carry-over effects across the range of a migratory songbird

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Abstract

Annual cycle events may be interlinked, influence following annual cycle stages, and may alter performance of individuals. Such links, called carry-over effects, can explain individual variation in timing or reproductive success in migratory species. Identifying the key links affecting fitness may reveal the mechanisms of species population dynamics but the current evidence for the strongest carry-over effects is equivocal. Here, we aim to assess the carry-over effects in great reed warblers Acrocephalus arundinaceus, a long-distance migratory songbird, using 103 full-annual tracks from three European and two Asian breeding populations. Our results showed strong positive relationships within autumn and spring migration periods and buffering capacity of the non-breeding period preventing events to carry over between these periods. Moreover, we found no profound relation between the non-breeding habitat quality or seasonality (quantified using stable isotopes and remote sensing data) and the timing of spring migration. The strongest carry-over effects occurred in individuals from the southern European breeding population compared to the northern and the central European populations. A moderate relationship between the habitat seasonality during moult and the spring migration timing indicates the importance of the complete moult. The overall weak carry-over effects of non-breeding habitat conditions found in this study contrast with previous results and imply between-species differences in these crucial relationships. Moreover, the population-specific carry-over effects highlight the importance of multi-population approach and advise caution in interpretation of results from single-population studies. Finally, the carry-over effect from the moulting period indicates the significance of a so-far neglected link in the species.

Significance statement

Environmental conditions vary in space and time. Therefore, migratory species adjust the timing of migration in order to maximise their fitness. However, the links between annual cycle events in multiple populations and the consequences of environmental conditions outside the breeding range are scarcely known. In this study, we used tracking data of the great reed warbler, an insectivorous bird species breeding across western Eurasia and wintering in Africa, to study a complex system of links between annual events. We found that the strength of these links differed between geographically distinct populations but not between sexes. Moreover, harsh environmental conditions during moult delayed the timing of subsequent events. Our findings could help explain large-scale differences in population size changes observed in some species and highlight the importance of energetically demanding moult period for the life of migratory species. Finally, our results demonstrate the need for multi-population approach in studies on seasonal interactions.

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Data availability

The dataset used in this study is available at https://doi.org/10.5281/zenodo.4088174 (Brlík et al. 2020b).

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Acknowledgments

We thank Jaroslav Koleček, Mihaela Ilieva, Milica Požgayová, Michal Šulc, Kateřina Sosnovcová, and others for their help in the field. Martins Briedis and Jaroslav Koleček provided valuable comments on the NDVI extraction and geolocator analysis, respectively, and Milica Požgayová extracted breeding site arrival dates. We are thankful to Silke Bauer, David Hořák, Simeon Lisovski, Martin Sládeček, Wouter Vansteelant, and anonymous reviewers for critical comments on the manuscript. The study is report number 66 for Kalimok field station and report number 194 for Kvismare Bird Observatory.

Funding

The study was financially supported by the Czech Science Foundation (grant no. 20-00648S to PP), the Swedish Research Council (grant no. 621-2013-4357 and 2016-04391 to DH; 621-2014-5222 and 2016-00689 to BH), Lunds Djurskyddsfond (for the Swedish part of the project), the Linnaeus Research Excellence project Centre for Animal Movement Research (CAnMove) funded by the Swedish Research Council and Lund University (grant no. 349-2007-8690), and Kungliga Fysiografiska Sällskapet (Duncker fonden to DH).

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Authors

Contributions

PP and VB conceived the idea of the study. VB, DD, AG, SH, BH, DH, TE, GM, SP, PP, and MW participated in retrieving geolocators and collecting feather samples. VB designed the methodology with input from SH, BH, DH, TE, GM, PP, and MW. VB and GM analysed the light-level data. EY analysed the stable isotopic composition of feather samples. BH, DH, SH, and PP acquired funding. VB gathered the remote sensing data and conducted the final analysis. VB took lead in the manuscript writing. All authors read and commented on the manuscript and approved the final version of the manuscript.

Corresponding author

Correspondence to Vojtěch Brlík.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethics approval

The tagging of the great reed warblers in Kvismaren/Segersjo have been approved by the Linkoping Animal Ethics Board (permit nos. 25-08, 36-11, 44-14). The fieldwork was in compliance with the current Czech Law on the Protection of Animals against Mistreatment (experimental project nos. 038/2011 and 3030/ENV/17–169/630/17) and permitted by the Bulgarian Ministry of Environment and Waters (permit nos. 427/11.11.2011, 627/30.03.2015, 672/17.03.2016). All applicable institutional and national guidelines for the care and use of animals were followed.

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Communicated by W. Wiltschko

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Brlík, V., Malmiga, G., Dimitrov, D. et al. Population-specific assessment of carry-over effects across the range of a migratory songbird. Behav Ecol Sociobiol 74, 143 (2020). https://doi.org/10.1007/s00265-020-02929-7

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  • DOI: https://doi.org/10.1007/s00265-020-02929-7

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