The boring sponge Cliona vastifica in a subarctic population of Chlamys islandica - An example of balanced commensalism?.

Barthel, Dagmar, Sundet, Jan and Barthel, Klaus-Günther (1994) The boring sponge Cliona vastifica in a subarctic population of Chlamys islandica - An example of balanced commensalism?. Open Access In: Sponges in Time and Space. Biology, Chemistry, Paleontology. , ed. by Van Soest, R. W. M., van Kempen, T. M. G. and Braekman, J. S.. Balkema, Rotterdam, Netherlands, pp. 289-296. ISBN 90-5410-097-4

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Abstract

The investigation was perfo1med on a stable population of the edible Iceland Scallop Chla111ys islandica (Millier) in the subarctic Balsfjord, Tromsi:i, Northern Norway. 470 Chla111ys specimens were collected and dry weight of the soft parts and of the shell, height of the shell, age of the animal and number of holes bored into each valve were determined. The population was found to be heavily infested by the boring sponge Cliona vast(fica Hancock, which is here close to its northern distribution limit. Nearly 90 % of all scallops had borings in their shells. Only specimens with an age of 3 years and less and a shell height of 35 mm or less were not infested. 100 % of scallops aged 16 years or more harbour C. vastifica in their shells. The average degree of infestation as judged by number of borings in the shell increases with age. However, statistical analysis of the relation of number of borings to both scallop body mass and shell weight at certain shell sizes indicates that C. vastifica does not impair the development of its substrate clams. The reason for this is the high growth rate of Chla111ys islandica in a fully suitable habitat and the comparatively low growth rate of Cliona vast(fica living close to the limit ofits geographical distribution; this long-term coexistence may represent a subtle balance between the commensalistic boring sponge
and substrate bivalve hardly possible in warmer areas.

Document Type: Book chapter
Additional Information: Proceedings of the 4th International Sponge Conference
Keywords: Ponifera; Associations, Symbiosis, Commensalism
Research affiliation: OceanRep > Institute for Marine Science Kiel
Date Deposited: 06 Apr 2018 08:04
Last Modified: 06 Apr 2018 08:04
URI: http://oceanrep.geomar.de/id/eprint/42626

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