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Spontaneous magnetic alignment behaviour in free-living lizards
Francisco J Diego-Rasilla1, Valentín Pérez-Mellado2, Ana Pérez-Cembranos2
1Departamento de Biología Animal, Universidad de Salamanca, Campus Miguel de Unamuno, Edificio de Farmacia 5ª Planta, 37007, Salamanca, Spain. fjdiego@herpetologica.org.
Die Naturwissenschaften
|March 3, 2017
Summary
Free-living lacertid lizards, Podarcis muralis and Podarcis lilfordi, show significant magnetic alignment. This animal behavior, independent of the sun, suggests a magnetic sense aiding spatial orientation and escape.
Area of Science:
- Zoology
- Animal Behavior
- Geophysics
Background:
- Vertebrates display spontaneous body axis alignment with Earth's magnetic field, known as magnetic alignment.
- Magnetoreception, the sense of magnetic fields, remains incompletely understood in many animals.
- Magnetic alignment studies offer insights into animal magnetic senses and their ecological roles.
Purpose of the Study:
- To investigate spontaneous magnetic alignment in two lacertid lizard species: Podarcis muralis and Podarcis lilfordi.
- To determine if lizard body orientation during basking is influenced by the sun's position or the geomagnetic field.
- To provide evidence for magnetic alignment behavior in free-living reptiles.
Main Methods:
- Monitoring body axis orientation of 255 Podarcis muralis and 456 Podarcis lilfordi over five years.
- Evaluating the influence of solar position (altitude, azimuth) and geomagnetic field data on lizard orientation.
- Statistical analysis to correlate lizard alignment with environmental factors.
Main Results:
- Both lizard species exhibited significant bimodal orientation along the north-northeast and south-southwest magnetic axes.
- Lizard body alignments were not explained by the sun's position, ruling out solar influence.
- Lizard orientation showed a significant correlation with geomagnetic field values at the time of observation.
Conclusions:
- Free-living lacertid lizards demonstrate spontaneous magnetic alignment behavior.
- This magnetic alignment is likely independent of solar cues and directly linked to the geomagnetic field.
- Magnetic alignment may serve as a directional reference for lizards, potentially enhancing spatial awareness and escape strategies.
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