Bird migration: Magnetic cues trigger extensive refuelling

@article{Fransson2001BirdMM,
  title={Bird migration: Magnetic cues trigger extensive refuelling},
  author={Thord Fransson and Sven Jakobsson and Patrik Johansson and Cecillia Kullberg and Johan Lind and Adrian Vallin},
  journal={Nature},
  year={2001},
  volume={414},
  pages={35-36}
}
Long stretches of sea and desert often interrupt the migration routes of small songbirds, whose fat reserves must be restored before these can be crossed as they provide no opportunity for refuelling. To investigate whether magnetic cues might enable inexperienced migratory birds to recognize a region where they need to replenish their body fat, we caught and held thrush nightingales (Luscinia luscinia) in Sweden just before their first migration and exposed them to a magnetic field simulating… 
Geomagnetic information modulates nocturnal migratory restlessness but not fueling in a long distance migratory songbird
TLDR
It is observed that the amount of migratory restlessness increased strongly with progression of the migratory season when the birds were kept constantly in the magnetic field of northern Germany, but the amount that decreased when the magneticField changed along the birds’ natural flyway are simulated.
Magnetic cues and time of season affect fuel deposition in migratory thrush nightingales (Luscinia luscinia)
TLDR
The relative importance of endogenous and environmental factors in individual birds is affected by the time of season and by geographical area, and when approaching a barrier, environmental cues may act irrespective of the endogenous time programme.
Fuelling decisions in migratory birds: geomagnetic cues override the seasonal effect
Recent evaluations of both temporal and spatial precision in bird migration have called for external cues in addition to the inherited programme defining the migratory journey in terms of direction,
Information from the geomagnetic field triggers a reduced adrenocortical response in a migratory bird
TLDR
The results show that experimental birds faced a reduced adrenocortical response compared with control birds, thus for the first time implying that geomagnetic cues trigger changes in hormonal secretion enabling appropriate behaviour along the migratory route.
How does a first year passerine migrant find its way? Simulating migration mechanisms and behavioural adaptations
TLDR
The results suggest that the Mediterranean Sea and the Sahara desert had a dominating influence on the evolution of endogenous directions and this influence is probably acting through flight range constraints.
Biphasal long-distance migration in green turtles
Sea turtles have recently been shown to have the sensory ability to use magnetic information for guidance in the open ocean, although the importance of different potential navigational cues remains
Geomagnetic field affects spring migratory direction in a long distance migrant
TLDR
It is shown that lesser whitethroats might incorporate geomagnetic field information to determine latitude during spring migration by isolating one orientation cue, the geom magnetic field.
Effect of geomagnetic field on migratory activity in a diurnal passerine migrant, the dunnock, Prunella modularis
TLDR
The results support the finding that geomagnetic information expected to be met en route is important for triggering level of migratory activity in juveniles of a diurnal songbird migrant.
Does migratory distance affect fuelling in a medium-distance passerine migrant?: results from direct and step-wise simulated magnetic displacements
TLDR
Fuelling rate in migrating dunnocks, a predominantly diurnal migratory songbird is influenced by a manipulated magnetic field when the birds are magnetically displaced north, but not south, in autumn.
BIO014779 272..278
  • 2016
...
1
2
3
4
5
...

References

SHOWING 1-7 OF 7 REFERENCES
Genetic control of migratory behaviour in birds.
  • P. Berthold
  • Biology, Medicine
    Trends in ecology & evolution
  • 1991
TLDR
A model has now been developed to estimate how inexperienced first-time migrants manage to reach their unknown winter quarters on the basis of inherited spatio-temporal programs.
Detection of magnetic field intensity by sea turtles
WHETHER migratory animals can determine their global position by detecting features of the Earth's magnetic field has long been debated1–4. To do this an animal must perceive (at least) two distinct
The orientation system and migration pattern of long-distance migrants: conflict between model predictions and observed patterns
TLDR
It is proposed that first-time migrants might be able to use landscape topography on a regional scale in combination with corrections of directional mistakes/wind displacements to account for the exceptionally precise migratory routes shown in this study.
Orientation cues used by migratory birds: A review of cue-conflict experiments.
  • K. Able
  • Biology, Medicine
    Trends in ecology & evolution
  • 1993
TLDR
The weight of evidence suggests that in short-term orientation decision making, magnetic cues take precedence over stars, and visual information at sunset overrides both these stimuli.
Reduction in escape performance as a cost of reproduction in gravid starlings, Sturnus vulgaris
TLDR
Escape performance was assessed in female European starlings for 6 weeks of the breeding season, and repeated measures show that angle of ascent during take-off decreases before and during laying, suggesting decreased take-offs ability, and hence ability to escape a predator, may be an important and previously ignored cost of reproduction in birds.
DETECTION OF MAGNETIC INCLINATION ANGLE BY SEA TURTLES: A POSSIBLE MECHANISM FOR DETERMINING LATITUDE
  • Lohmann
  • Biology, Medicine
    The Journal of experimental biology
  • 1994
TLDR
It is demonstrated that sea turtles can distinguish between different magnetic inclination angles and perhaps derive from them an approximation of latitude.
Control of bird migration
TLDR
Control of migration, the present view, current microevolutionary processes and control mechanisms and ecophysiology.