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Zebra finches have a light-dependent magnetic compass similar to migratory birds

Pinzon-Rodriguez, Atticus LU and Muheim, Rachel LU (2017) In Journal of Experimental Biology 220(7). p.1202-1209
Abstract

Birds have a light-dependent magnetic compass that provides information about the spatial alignment of the geomagnetic field. It is proposed to be located in the avian retina and mediated by a lightinduced, radical-pair mechanism involving cryptochromes as sensory receptor molecules. To investigate how the behavioural responses of birds under different light spectra match with cryptochromes as the primary magnetoreceptor, we examined the spectral properties of the magnetic compass in zebra finches. We trained birds to relocate a food reward in a spatial orientation task using magnetic compass cues. The birds were well oriented along the trained magnetic compass axis when trained and tested under low-irradiance 521 nm green light. In the... (More)

Birds have a light-dependent magnetic compass that provides information about the spatial alignment of the geomagnetic field. It is proposed to be located in the avian retina and mediated by a lightinduced, radical-pair mechanism involving cryptochromes as sensory receptor molecules. To investigate how the behavioural responses of birds under different light spectra match with cryptochromes as the primary magnetoreceptor, we examined the spectral properties of the magnetic compass in zebra finches. We trained birds to relocate a food reward in a spatial orientation task using magnetic compass cues. The birds were well oriented along the trained magnetic compass axis when trained and tested under low-irradiance 521 nm green light. In the presence of a 1.4 MHz radio-frequency electromagnetic (RF)-field, the birds were disoriented, which supports the involvement of radical-pair reactions in the primary magnetoreception process. Birds trained and tested under 638 nm red light showed a weak tendency to orient ~45 deg clockwise of the trained magnetic direction. Under low-irradiance 460 nm blue light, they tended to orient along the trained magnetic compass axis, but were disoriented under higher irradiance light. Zebra finches trained and tested under high-irradiance 430 nm indigo light were well oriented along the trained magnetic compass axis, but disoriented in the presence of a RF-field. We conclude that magnetic compass responses of zebra finches are similar to those observed in nocturnally migrating birds and agree with cryptochromes as the primary magnetoreceptor, suggesting that light-dependent, radicalpair- mediated magnetoreception is a common property for all birds, including non-migratory species.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cryptochrome, Magnetoreception, Orientation, Radical-pair process, Taeniopygia guttata
in
Journal of Experimental Biology
volume
220
issue
7
pages
8 pages
publisher
The Company of Biologists Ltd
external identifiers
  • scopus:85016548592
  • wos:000397620100015
ISSN
0022-0949
DOI
10.1242/jeb.148098
language
English
LU publication?
yes
id
dfae957e-b97d-4434-a1eb-aa1454bf64ba
date added to LUP
2017-05-04 06:57:52
date last changed
2018-01-07 12:01:49
@article{dfae957e-b97d-4434-a1eb-aa1454bf64ba,
  abstract     = {<p>Birds have a light-dependent magnetic compass that provides information about the spatial alignment of the geomagnetic field. It is proposed to be located in the avian retina and mediated by a lightinduced, radical-pair mechanism involving cryptochromes as sensory receptor molecules. To investigate how the behavioural responses of birds under different light spectra match with cryptochromes as the primary magnetoreceptor, we examined the spectral properties of the magnetic compass in zebra finches. We trained birds to relocate a food reward in a spatial orientation task using magnetic compass cues. The birds were well oriented along the trained magnetic compass axis when trained and tested under low-irradiance 521 nm green light. In the presence of a 1.4 MHz radio-frequency electromagnetic (RF)-field, the birds were disoriented, which supports the involvement of radical-pair reactions in the primary magnetoreception process. Birds trained and tested under 638 nm red light showed a weak tendency to orient ~45 deg clockwise of the trained magnetic direction. Under low-irradiance 460 nm blue light, they tended to orient along the trained magnetic compass axis, but were disoriented under higher irradiance light. Zebra finches trained and tested under high-irradiance 430 nm indigo light were well oriented along the trained magnetic compass axis, but disoriented in the presence of a RF-field. We conclude that magnetic compass responses of zebra finches are similar to those observed in nocturnally migrating birds and agree with cryptochromes as the primary magnetoreceptor, suggesting that light-dependent, radicalpair- mediated magnetoreception is a common property for all birds, including non-migratory species.</p>},
  author       = {Pinzon-Rodriguez, Atticus and Muheim, Rachel},
  issn         = {0022-0949},
  keyword      = {Cryptochrome,Magnetoreception,Orientation,Radical-pair process,Taeniopygia guttata},
  language     = {eng},
  month        = {04},
  number       = {7},
  pages        = {1202--1209},
  publisher    = {The Company of Biologists Ltd},
  series       = {Journal of Experimental Biology},
  title        = {Zebra finches have a light-dependent magnetic compass similar to migratory birds},
  url          = {http://dx.doi.org/10.1242/jeb.148098},
  volume       = {220},
  year         = {2017},
}