Data from: Landscape-dependent time versus energy optimisations in pelicans migrating through a large ecological barrier
Data from: Landscape-dependent time versus energy optimisations in pelicans migrating through a large ecological barrier
Citation
Efrat R, Hatzofe O, Nathan R. 2019. Data from: Landscape-dependent time versus energy optimisations in pelicans migrating through a large ecological barrier. Movebank Data Repository. https://doi.org/10.5441/001/1.hs79pk45Abstract
1. During migration, birds are often forced to cross ecological barriers, facing challenges due to scarcity of resources and suitable habitats. While crossing such barriers, birds are expected to adjust their behaviour to reduce time, energy expenditure and associated risks.
2. We studied the crossing of the Sahara Desert by the Great White Pelican (Pelecanus onocrotalus), a large wetland‐specialist. We focused on decisions made by migrating pelicans along different parts of the southbound autumn migration, their response to local environmental conditions, and the implications for time and energy optimisations. We compared the observed pelicans' migration routes with simulated “direct‐pass” (shortest, mostly across the desert) and “corridor‐pass” (along the Nile River) routes, and used GPS, body acceleration and atmospheric modelling to compare flight behaviour along the Nile River versus the desert.
3. The observed route was significantly shorter and faster than the simulated corridor‐pass route and not significantly different from the simulated direct‐pass one. Daily flights over the desert were longer than along the Nile River, with flying time extending to late hours of the day despite unfavourable atmospheric conditions for soaring‐gliding flight. Moreover, the pelicans behavioural response to atmospheric conditions changed according to the landscape over which they flew. Overall, the pelicans showed stronger behavioural adjustments to atmospheric conditions over the desert than along the Nile River.
4. Our findings suggest that migrating pelicans primarily acted as time minimisers while crossing the Sahara Desert, whereas energetic optimisation was only considered when it did not substantially compromise time optimisation. The pelicans took the almost shortest possible route, only following the Nile River along its south‐oriented parts, and frequently staged overnight in the desert far from water, despite being large, wet‐habitat specialists. Correspondingly, their behavioural response to atmospheric conditions changed according to the landscape over which they were flying, switching between time (over the desert) and energy (over the Nile River) optimisation strategies. Our results suggest that the interaction between landscape and atmospheric conditions depict a flexible, yet primarily time‐dominated, migration optimisation strategy.
Keywords
Pelecanus onocrotalus,animal movement,animal tracking,avian migration,bio-logging,energy expenditure,great white pelican,movement ecology,Pelecanus onocrotalus,Sahara Desert
DOIs of related Publications
BibTex
@misc{001/1_hs79pk45,
title = {Data from: Landscape-dependent time versus energy optimisations in pelicans migrating through a large ecological barrier},
author = {Efrat, R and Hatzofe, O and Nathan, R},
year = {2019},
URL = {http://dx.doi.org/10.5441/001/1.hs79pk45},
doi = {doi:10.5441/001/1.hs79pk45},
publisher = {Movebank data repository}
}RIS
TY - DATA ID - doi:10.5441/001/1.hs79pk45 T1 - Data from: Landscape-dependent time versus energy optimisations in pelicans migrating through a large ecological barrier AU - Efrat, Ron AU - Hatzofe, Ohad AU - Nathan, Ran Y1 - 2019/08/08 KW - Pelecanus onocrotalus KW - accelerometer KW - animal movement KW - animal tracking KW - avian migration KW - bio-logging KW - energy expenditure KW - great white pelican KW - movement ecology KW - Pelecanus onocrotalus KW - Sahara Desert KW - Pelecanus onocrotalus PB - Movebank data repository UR - http://dx.doi.org/10.5441/001/1.hs79pk45 DO - doi:10.5441/001/1.hs79pk45 ER -