Bats by Cindy Rodriguez

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By Cindy Rodriguez

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In fact, there is much less known than unknown here. Nevertheless, a certain amount of data has been collected. Just as in the case of all other magnetoreception models, it is assumed that the putative magnetite-based magnetoreceptors 26 1 Orientation and Navigation Cues are connected to the nervous system in order to transmit the signal to the analyzing centers in the brain. Direct anatomical evidence is, to date, scarce and mostly involves studies on bobolinks, Dolichonyx oryzivorus, and rainbow trout (Walker et al.

This fact, although not clearly 28 1 Orientation and Navigation Cues explained so far, is suggested by some authors (Wiltschko et al. 2002b) to account for the superparamagnetite-based magnetoreception, as this model theoretically allows magnetoreceptor restoration to the original state after the damage caused by a strong magnetic pulse. Brassart et al. (1999) presented another study indicating the use of both lightdependent and light-independent mechanisms and strongly supporting the presence of magnetite particles in the animal bodies.

Application of electrocardiography methods and behavioral conditioning has shown sensitivity to magnetic fields in the fry and larvae of brook trout, Salmo trutta (Formicki et al. 2004), and the adult and glass eel (the newly metamorphosed juveniles) stages of Japanese eels, Anguilla japonica (Nishi et al. 2004; Nishi and Kawamura 2005). Interestingly, anosmic Japanese eels were not able to detect magnetic field (Nishi et al. 2005), which rather suggests a magnetite-based magnetoreceptor located in the nasal cavity or near it, and is in accord with the previous histological findings yet mentioned.

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