Fall migrations of juvenile vs. adult white storks (data from Rotics et al. 2016)-reference-data

Rotics S, Kaatz M, Resheff YS, Turjeman SF, Zurell D, Sapir N, Eggers U, Flack A, Fiedler W, Jeltsch F, Wikelski M, Nathan R. Fall migrations of juvenile vs. adult white storks (data from Rotics et al. 2016)-reference-data. Movebank Data Repository. https://doi.org/10.5441/001/1.hn1bd23k/6
(1) Migration conveys an immense challenge especially for juvenile birds coping with enduring and risky journeys shortly after fledging. Accordingly, juveniles exhibit considerably lower survival rates compared to adults, particularly during migration. Also, juvenile white storks (Ciconia ciconia), which are known to rely on adults during their first fall migration, presumably for navigational purposes, display much lower annual survival than adults. (2) Using detailed GPS and body acceleration data, we examined the patterns and potential causes of age-related differences in fall migration properties of white storks by comparing first-year juveniles and adults. We compared juvenile and adult parameters of movement, behavior and energy expenditure (estimated from overall dynamic body acceleration, ODBA) and placed this in the context of the juveniles’ lower survival rate. (3) Juveniles used flapping flight versus soaring flight 23% more than adults and were estimated to expend 14% more energy during flight. Juveniles did not compensate for increased flight costs by increased refueling or resting during migration. When juveniles and adults migrated together in the same flock, the juvenile flew mostly behind the adult and was left behind when they separated. Juveniles showed greater improvement in flight efficiency throughout migration compared to adults which appears crucial because juveniles exhibiting higher flight costs suffered increased mortality. (4) Our findings demonstrate the conflict between the juveniles’ inferior flight skills and their urge to keep up with mixed adult-juvenile flocks. We suggest that increased flight costs are an important proximate cause of juvenile mortality in white storks and likely in other soaring migrants, and that natural selection is operating on juvenile variation in flight efficiency.
animal migration,animal movement,animal tracking,avian migration,Ciconia ciconia,Env-DATA,flight,flight efficiency,GSM telemetry,juvenile mortality,migration,Movebank,white stork
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  title = {Fall migrations of juvenile vs. adult white storks (data from Rotics et al. 2016)-reference-data},
  author = {Rotics, S and Kaatz, M and Resheff, YS and Turjeman, SF and Zurell, D and Sapir, N and Eggers, U and Flack, A and Fiedler, W and Jeltsch, F and Wikelski, M and Nathan, R},
  URL = {http://dx.doi.org/10.5441/001/1.hn1bd23k/6},
  doi = {doi:10.5441/001/1.hn1bd23k/6},
  publisher = {Movebank data repository}
ID  - doi:10.5441/001/1.hn1bd23k/6
T1  - Fall migrations of juvenile vs. adult white storks (data from Rotics et al. 2016)-reference-data
AU  - Rotics, Shay
AU  - Kaatz, Michael
AU  - Resheff, Yehezkel S.
AU  - Turjeman, Sondra Feldman
AU  - Zurell, Damaris
AU  - Sapir, Nir
AU  - Eggers, Ute
AU  - Flack, Andrea
AU  - Fiedler, Wolfgang
AU  - Jeltsch, Florian
AU  - Wikelski, Martin
AU  - Nathan, Ran
KW  - animal migration
KW  - animal movement
KW  - animal tracking
KW  - avian migration
KW  - Ciconia ciconia
KW  - Env-DATA
KW  - flight
KW  - flight efficiency
KW  - GSM telemetry
KW  - juvenile mortality
KW  - migration
KW  - Movebank
KW  - white stork
KW  - Ciconia ciconia
PB  - Movebank data repository
UR  - http://dx.doi.org/10.5441/001/1.hn1bd23k/6
DO  - doi:10.5441/001/1.hn1bd23k/6
ER  -