Savannah sparrow, Kent Island, New Brunswick (data from Mitchell et al. 2015)-reference-data

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Mitchell GW. 2015. Savannah sparrow, Kent Island, New Brunswick (data from Mitchell et al. 2015)-reference-data. Movebank Data Repository.
Background: Given that winds encountered on migration could theoretically double or half the energy expenditure of aerial migrants, there should be strong selection on behaviour in relation to wind conditions aloft. However, evidence suggests that juvenile songbirds are less choosey about wind conditions at departure relative to adults, potentially increasing energy expenditure during flight. To date, there has yet to be a direct comparison of flight efficiency between free-living adult and juveniles songbirds during migration in relation to wind conditions aloft, likely because of the challenges of following known aged individual songbirds during flight. We used an automated digital telemetry array to compare the flight efficiency of adult and juvenile Savannah sparrows (Passerculus sandwichensis) as they flew nearly 100 km during two successive stages of their fall migration; a departure flight from their breeding grounds out over the ocean and then a migratory flight along a coast. Using a multilevel path modelling framework, we evaluated the effects of age, flight stage, tailwind component, and crosswind component on flight duration and groundspeed. Results: We found that juveniles departed under wind conditions that were less supportive relative to adults and that this resulted in juveniles taking 1.4 times longer to complete the same flight trajectories as adults. We did not find an effect of age on flight duration or groundspeed after controlling for wind conditions aloft, suggesting that both age groups were flying at similar airspeeds. We also found that groundspeeds were 1.7 times faster along the coast than over the ocean given more favourable tailwinds along the coast and because birds appeared to be climbing in altitude over the ocean, diverting some energy from horizontal to vertical movement. Conclusions: Our results provide the first direct evidence that adult songbirds have considerably more efficient migratory flights than juveniles, and that this efficiency is driven by the selection of more supportive tailwind conditions aloft. Given the importance of wind for efficient flight, we suggest this behaviour could be adaptive in juveniles, if for example, the benefits of a more flexible departure schedule outweigh the costs of flying with less supportive winds.
altitude,aeroecology,air speed,animal tracking,automated telemetry,avian migration,crosswinds,Env-DATA,flight costs,ground speed,migration,Movebank,Passerculus sandwichensis,radio telemetry,Savannah sparrow,songbirds,tailwinds,wind support
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DOIs of related Publications
  title = {Savannah sparrow, Kent Island, New Brunswick (data from Mitchell et al. 2015)-reference-data},
  author = {Mitchell, GW},
  year = {2015},
  URL = {},
  doi = {doi:10.5441/001/1.82652t83/2},
  publisher = {Movebank data repository}
ID  - doi:10.5441/001/1.82652t83/2
T1  - Savannah sparrow, Kent Island, New Brunswick (data from Mitchell et al. 2015)-reference-data
AU  - Mitchell, Greg W.
Y1  - 2015/09/24
KW  - altitude
KW  - aeroecology
KW  - air speed
KW  - animal tracking
KW  - automated telemetry
KW  - avian migration
KW  - crosswinds
KW  - Env-DATA
KW  - flight costs
KW  - ground speed
KW  - migration
KW  - Movebank
KW  - Passerculus sandwichensis
KW  - radio telemetry
KW  - Savannah sparrow
KW  - songbirds
KW  - tailwinds
KW  - wind support
KW  - Passerculus sandwichensis
PB  - Movebank data repository
UR  -
DO  - doi:10.5441/001/1.82652t83/2
ER  -