RESEARCH ON THE ASTRONOMICAL ORIENTATION OF EQUATORIAL LITTORAL AMPHIPODA. I. SOLAR ORIENTATION IN ONE SOMALIAN POPULATION OF TALORCHESTER MARTENSII WEBER (RICERCHE SULL'ORIENTAMEN TO ASTRONOMICO DI ANFIPODI LITORALI DELLA ZONA EQUATORIALE. I. L'ORIENTAME
The solar orientation of Talorchestia martensii Weber was investigated. The mechanism of solar orientation shows particular time variations of its correctness, due to the local astronomic circumstances. Animals tested immediately after collection, after having been kept under a normal artificial rhythm of light-darkness, or kept segregated in continuous darkness, showed systematic differences from the correct orientation. The existence of an innate correct directional tendency is confirmed in littoral Amphipods. The behavior during the 2 periods of positive and negative solar declination is discussed and 3 hypotheses are offered in explanation. (Author)
24 MAY 1964
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