Behavioural evidence of magnetoreception in dolphins: detection of experimental magnetic fields
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Magnetoreception, meaning the perception of magnetic fields, is supposed to play an important role for orientation/navigation in some terrestrial and aquatic species. Although some spatial observations of free-ranging cetaceans’ migration routes and stranding sites led to the assumption that cetaceans may be sensitive to the geomagnetic field, experimental evidence is lacking. Here, we tested the spontaneous response of six captive bottlenose dolphins to the presentation of two magnetized and demagnetized controlled devices while they were swimming freely. Dolphins approached the device with shorter latency when it contained a strongly magnetized neodymium block compared to a control demagnetized block that was identical in form and density and therefore undistinguishable with echolocation. We conclude that dolphins are able to discriminate the two stimuli on the basis of their magnetic properties, a prerequisite for magnetoreception-based navigation.
KeywordsSensory perception Magnetic sense Cetaceans
- Bauer GB, Fuller M, Perry A, Dunn JR, Zoeger J (1985) Magnetoreception and biomineralization of magnetite in cetaceans. In: Kirschvink JL, Jones DS, MacFadden BJ (eds) Magnetite biomineralization and magnetoreception in organisms: a new biomagnetism. Plenum Press, New York, pp 489–507CrossRefGoogle Scholar
- Kirschvink JL, Dizon AE, Westphal JA (1986) Evidence from strandings for geomagnetic sensitivity in cetaceans. J Exp Biol 120:1–24Google Scholar
- Klinowska L (1985) Cetacean live stranding sites relate to geomagnetic topography. Aquat Mamm 1:27–32Google Scholar
- Walker MM, Dennis TE (2005) Role of the magnetic sense in the distribution and abundance of marine animals. Mar Ecol Prog Ser 287:295–307Google Scholar