Abstract
SUMMARY 1. A population of the amphipod Talorchestia martensii Weber from a beach a little below the Equator (Twiga: 4° Lat. South, in the area of Mombasa, Kenya) shows a correct solar astronomical orientation during both the periods of different solar culmination (clockwise and counter-clockwise phases). 2. Intertropical populations of Amphipods are therefore capable of compensating for the apparent clockwise as well as for the counter-clockwise motion of the sun. 3. Disturbances in orientation found in the population of Mogadishu (2° Lat. North, Somali Republic) during the counter-clockwise period are probably due to an interference between a positive phototactical tendency and the correct astronomical orientation. 4. Animals from the population of Twiga were rapidly transferred by air from the original locality (where the sun was culminating North) to a latitude where the sun was culminating South (Asmara, Ethiopia). The animals tested at Asmara essentially kept their counter-clockwise compensation for...
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