Abstract
Orientation behavior of two species of littoral molluscs inhabiting mangrove brushwoods at the Guinea coast is studied under field and laboratory conditions. It is shown that Littorina angulifera able to breath air demonstrates a selective movement in the vertical direction upwards from the water surface to the rhizophlora crown. The partial bilateral extirpation of head feelers did not disturb the revealed orientation. The Tympanotus fuscatus inhabiting the slit ground has a tendency for agglomeration. The molluscs transferred at the distance up to 50 cm from the agglomeration try to return to it. The revealed reaction was confirmed by experiments in labyrinth. Extirpation of distal parts of head feelers reduced statistically significantly the orientation ability of the animals. Using video recording, a change of the mollusc movement rate in the labyrinth during orientation towards their conspecific clusters is shown. The biological significance and possible physiological mechanisms of the revealed reactions are discussed.
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