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TOPIC: Magnetoception

Blobrana

L

Posts: 131433

Date: Dec 6 21:21 2012

RE: Magnetoception	Permalink

Title: Magnetic Alignment in Carps: Evidence from the Czech Christmas Fish Market Authors: Vlastimil Hart, Tomá Kuta, Pavel Nemec, Veronika Bláhová, Milo Jeek, Petra Nováková, Sabine Begall, Jaroslav Cervený, Vladimír Hanzal, Erich Pascal Malkemper, Kamil típek, Christiane Vole, Hynek Burda While magnetoreception in birds has been studied intensively, the literature on magnetoreception in bony fish, and particularly in non-migratory fish, is quite scarce. We examined alignment of common carps (Cyprinus carpio) at traditional Christmas sale in the Czech Republic. The sample comprised measurements of the directional bearings in 14,537 individual fish, distributed among 80 large circular plastic tubs, at 25 localities in the Czech Republic, during 817 sampling sessions, on seven subsequent days in December 2011. We found that carps displayed a statistically highly significant spontaneous preference to align their bodies along the North-South axis. In the absence of any other common orientation cues which could explain this directional preference, we attribute the alignment of the fish to the geomagnetic field lines. It is apparent that the display of magnetic alignment is a simple experimental paradigm of great heuristic potential. Source __________________

Blobrana

L

Posts: 131433

Date: Apr 29 11:16 2012

Magnetoreception	Permalink

Magnetic fields light up 'GPS neurons', scientists say Researchers have spotted a group of 53 cells within pigeons' brains that respond to the direction and strength of the Earth's magnetic field. The question of how birds navigate using - among other signals - magnetic fields is the subject of much debate. Read more __________________

Blobrana

L

Posts: 131433

Date: Apr 27 02:25 2012

Magnetoception	Permalink

Pigeons may 'hear' magnetic fields Individual neurons in birds' brains can relay crucial information about Earth's magnetic field, possibly providing the animals with an 'internal GPS', according to research into magnetoreception. Pigeons' remarkable navigational feats have long been pegged to the birds' ability to sense magnetic fields, but pinning down how they do so has frustrated scientists for years. Work published today in Science shows that individual cells seem to encode information on a magnetic field's direction, intensity and polarity. The work also suggests that these signals come from a part of the inner ear called the lagena, further complicating matters for researchers in the field. Read more __________________

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