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Use of electro-olfactography to measure olfactory acuity in the North American bullfrog (Lithobates (Rana) catesbeiana) tadpole.
Ecotoxicology and Environmental Safety 2018 January
Olfaction is an important sense for aquatic organisms because it provides information about their surroundings, including nearby food, mates, and predators. Electro-olfactography (EOG) is an electrophysiological technique that measures the response of olfactory tissue to olfactory stimuli, and responses are indicative of olfactory acuity. Previous studies have used this technique on a variety of species including frogs, salamanders, daphniids and, most extensively, fish. In the present study, we introduce a novel modified EOG method for use on Lithobates (Rana) catesbeiana tadpoles. Responses to a number of olfactory stimuli including amino acids, an algal extract (Spirulina), and taurocholic acid were tested, as measured by EOG. Tadpoles exhibited consistent and reliable responses to L-alanine and Spirulina extract. Tadpoles also exhibited concentration-dependent responses to Spirulina extract. These findings indicate that tadpole EOG is a viable electrophysiology technique that can be used in future research to study olfactory physiology and impairment in tadpoles.
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