Bird migration: Magnetic cues trigger extensive refuelling

  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},
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
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)
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
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
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
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
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
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


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