אסיף מאגר המחקר החקלאי

The effect of exposure to black background and to α-MSH on black-white background preference in the amphibian Xenopus laevis (Daudin)

Year:

1978

Source of publication :

Authors :

Volume :

11

Co-Authors:

Karplus, I., Department of Isotope Research, Weizmann Institute of Science, Rehovot, Israel
Samuel, D., Department of Isotope Research, Weizmann Institute of Science, Rehovot, Israel

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Abstract:

Young frogs, Xenopus laevis, raised on a white background showed a slight preference for the black background of a black-white preference testing apparatus. Keeping frogs for either 24 hr or 20 days on a black background resulted in a further increase in their preference for black. Injecting 1 μg of synthetic α-MSH into white-adapted frogs had no effect on their black-white preference. On the other hand, Xenopus laevis tadpoles, at an early stage of metamorphosis, raised on a white background showed a significant preference for white. Keeping these tadpoles for 24 hr on a black background resulted in a shift from white to black preference. Injecting synthetic α-MSH into white-adapted tadpoles resulted in an increase in their preference for black. A behavioral feedback mechanism appears to exist between the release of endogenous MSH when a tadpole is exposed to a black background and its subsequent preference for background color. © 1978.

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