Data from: The characteristic time scale of perceived information for decision-making: departure from thermal columns in soaring birds

When using this dataset, please cite the original article.

Harel R, Nathan R (2018) The characteristic time scale of perceived information for decision-making: departure from thermal columns in soaring birds. Functional Ecology. doi:10.1111/1365-2435.13136

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Harel R, Nathan R (2018) Data from: The characteristic time scale of perceived information for decision-making: departure from thermal columns in soaring birds. Movebank Data Repository. doi:10.5441/001/1.46t5141d
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Package Identifier doi:10.5441/001/1.46t5141d  
 
Abstract (1) Animals are often required to make decisions about their use of current resources while minimising travel costs and risks due to uncertainty about the forthcoming resources. Passive soaring birds utilise warm rising‐air columns (thermals) to climb up and obtain potential energy for flying across large areas. However, the utilisation of such inconsistent natural resources may be challenging for soaring‐gliding birds and involve a set of decisions to maintain efficient flight. (2) To assess which temporal scales of previous experience with environmental inputs best predicted thermal‐climbing departure decisions of soaring birds, we used movement data from Eurasian griffon vultures (Gyps fulvus) tracked by GPS transmitters. We applied Cox proportional hazard regression and a model selection approach to identify thermal‐climbing departure decisions and to compare a range of temporal scales. (3) Our findings support the use of current and recent (short‐term; last 20 minutes) experiences, compared to longer term, past experiences, in predicting the time until departure from thermals. The models supported decision rules that integrated information originating from different temporal scales, implying a tendency to depart from a thermal later when the current climb rate was stronger than experienced recently and vice‐versa. Additionally, climb rates in thermals revealed significant autocorrelation over short time scales (shorter than 30 minutes). (4) The correspondence between thermals’ characteristics and the factors that best predicted thermal‐climbing departure decisions presumably reflect optimal decisions individuals make to handle their dynamic environment and to reduce movement‐related costs of such a basic activity for soaring‐gliding birds.
Keywords animal foraging, animal movement, animal tracking, avian flight, Eurasian griffon vulture, GPS logger, gyps fulvus, soaring-gliding,

Soaring flight in Eurasian griffon vultures (HUJ) (data from Harel and Nathan, 2018) View File Details
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To the extent possible under law, the authors have waived all copyright and related or neighboring rights to this data.  



Soaring flight in Eurasian griffon vultures (HUJ) (data from Harel and Nathan, 2018)-reference-data View File Details
Download: README.txt ( 9.599Kb )
Download: Soaring flight in Eurasian griffon vultures (HUJ) (data from Harel and Nathan, 2018)-reference-data.csv ( 3.916Kb )
To the extent possible under law, the authors have waived all copyright and related or neighboring rights to this data.  


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