PSYC 3201 Lecture Notes - Lecture 41: Goblin Shark, Electroreception, Electric Organ
25 Dec 2016
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Goblin shark has lots of electroreceptors around their snouts. They sweep nose over seabed and detect electricity of other organisms (like a metal detector) The jaw then comes out and eats prey. Sharks, eels, and duck-billed platypus also have electrolocation due to electroreceptors. They can adjust their electric signal to avoid predators. Predators can detect typical biphasic electric signal. So if predators around, they produce monophasic electrical signal. Conspecifics can still detect this, but predators cannot. Loggerhead sea turtles detect and use earth s magnetic fields to follow migratory routes. Redirection lab tests with young naive turtles. They lined a test tank with different magnetic fields. Magnetite (substance in brain sensitive to magnetic fields) Magnetic noise disrupts migratory orientation in european robins. Happens especially in cities (even plugging in a lamp creates electromagnetic activity that can be sensed) North-south alignment discovered worldwide using google earth. North-south alignment discovered in dogs while in defecation and urination.
