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

Brlík, Vojtěch ; Malmiga, Gintaras LU ; Dimitrov, Dimitar ; Emmenegger, Tamara ; Gavrilov, Andrey ; Hasselquist, Dennis LU ; Peev, Strahil ; Willemoes, Mikkel LU ; Yohannes, Elizabeth and Hahn, Steffen , et al. (2020) In Behavioral Ecology and Sociobiology 74(12).
Abstract

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... (More)

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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publication status
published
subject
keywords
Migration, Remote sensing, Seasonal interaction, Stable isotope, Tracking
in
Behavioral Ecology and Sociobiology
volume
74
issue
12
article number
143
publisher
Springer
external identifiers
  • scopus:85095951804
ISSN
0340-5443
DOI
10.1007/s00265-020-02929-7
language
English
LU publication?
yes
id
ef0bc432-1835-462d-bddb-a21435dea9ce
date added to LUP
2020-11-23 15:33:32
date last changed
2021-04-15 14:41:37
@article{ef0bc432-1835-462d-bddb-a21435dea9ce,
  abstract     = {<p>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.</p>},
  author       = {Brlík, Vojtěch and Malmiga, Gintaras and Dimitrov, Dimitar and Emmenegger, Tamara and Gavrilov, Andrey and Hasselquist, Dennis and Peev, Strahil and Willemoes, Mikkel and Yohannes, Elizabeth and Hahn, Steffen and Hansson, Bengt and Procházka, Petr},
  issn         = {0340-5443},
  language     = {eng},
  number       = {12},
  publisher    = {Springer},
  series       = {Behavioral Ecology and Sociobiology},
  title        = {Population-specific assessment of carry-over effects across the range of a migratory songbird},
  url          = {http://dx.doi.org/10.1007/s00265-020-02929-7},
  doi          = {10.1007/s00265-020-02929-7},
  volume       = {74},
  year         = {2020},
}