Abstract
Planktivorous fishes frequently have to cope with spatial dynamics of their prey and should be flexible in their vertical food search position. In two experiments Danube bleak Chalcalburnus chalcoides mento, a planktivorous cyprinid, was conditioned to forage on chironomid larvae within the bottom zone and on the cladoceran Leptodora kindtii in the open water of experimental tanks. The fish responded to the presence of chironomids by orienting their snapping behaviour towards the bottom. After most of the prey were depleted, the fish shifted their search position to the open water. Fish were offered L. kindtii at higher densities than the chironomids in the second experiment. With one exception all fish snapped at a high rate into the open water with no observed vertical spatial shifts. One highly active individual showed a clear shift from the open water towards the bottom after depleting most of the L. kindtii. After previous conditioning with chironomids, Danube bleak responded to the presentation of a conditioned stimulus by searching at a deeper position than during control recordings of spontaneous snappings and during a conditioned response test after training with L. kindtii. These results provide preliminary evidence that Danube bleak can detect variation in vertical prey distribution and can build up internal spatial representations.
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Uiblein, F. (1995). Effects of vertical prey distribution on the food-searching behaviour of Danube bleak Chalcalburnus chalcoides mento . In: Balvay, G. (eds) Space Partition within Aquatic Ecosystems. Developments in Hydrobiology, vol 104. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0293-3_30
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DOI: https://doi.org/10.1007/978-94-011-0293-3_30
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