Tentacular function in snail olfactory orientation

摘要: 1. The olfactory orienting behavior of the terrestrial snailAchatina fulica was studied in intact animals, animals with bilateral lesions either anterior tentacles or posterior tentacles, and unilateral tentacles. Tentacular function evaluated under three different conditions. 2. One assay required snails to locomote upwind a two-armed olfactometer enter side which airstream contained food odor. The performance controls statistically indistinguishable from that tentacle Snails lacking both performed at chance levels (Table 1). 3. The second consisted trail following on mucus slime trail. Bilateral amputations were without effect, but led significant deficit compared 2). 4. The third measured accuracy locomotion distant odor source still air. A circular arena employed. Intact consistently oriented high degree accuracy. Animals failed orient. produced turning bias towards (Fig. 2). 5. The results demonstrate thatAchatina can orient stimuli by least means, namely, anemotaxis, movement up concentration gradient following. are involved differentially these behaviors. Also, anemotaxis requires only single (klinotaxis), whereas orientation gradients utilizes simultaneous comparisons (tropotaxis) 3).