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Active aggregation and downshore migration in the trochid snail Umbonium vestiarium (L.) on a tropical sand flat
Hüttel, M. (1986). Active aggregation and downshore migration in the trochid snail Umbonium vestiarium (L.) on a tropical sand flat, in: Muus, K. (Ed.) Proceedings of the 20th European Marine Biology Symposium: Nutrient Cycling. Processes in Marine Sediments, Hirtshals, Denmark, 9-13 September 1985. Ophelia: International Journal of Marine Biology, 26: pp. 221-232
In: Muus, K. (Ed.) (1986). Proceedings of the 20th European Marine Biology Symposium: Nutrient Cycling. Processes in Marine Sediments, Hirtshals, Denmark, 9-13 September 1985. European Marine Biology Symposia, 20. Ophelia: International Journal of Marine Biology, 26. ISBN 87-981066-4-3. 477 pp., meer
In: European Marine Biology Symposia., meer
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Documenttype: Congresbijdrage
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Abstract
    Aggregations of the filtering archeogastropod Umbonium vestiarium (L.) were investigated in a tropical sandflat on Phuket Island, southern Thailand. Field experiments showed that these assemblages were formed when snail abundance exceeded five individuals per 10 cm². In these aggregations an average density of 2-3.5 snails per cm² and a central density of 5-7 snails per cm² were measured. The biomass ranged from 92 to 148 g/m² AFDW. The Umbonium aggregations are conspicuous elevations which are generated by the snails fixing sediment with their mucus. During calm weather periods migration of the snail assemblages towards the sublittoral was observed. The formation of aggregations in Umbonium vestiarium prevents deportation from the tidal zone and is interpreted to be advantageous for filter feeding and reproduction.
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