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Smaller host size and monopolization of space in Patagonian scallops, Psychrochlamys patagonica, covered by the sponge Iophon proximum
Gappa, J.L.; Landoni, N.A. (2007). Smaller host size and monopolization of space in Patagonian scallops, Psychrochlamys patagonica, covered by the sponge Iophon proximum. J. Mar. Biol. Ass. U.K. 87(4): 927-931. dx.doi.org/doi:10.1017/S0025315407056081
In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Gappa, J.L.
  • Landoni, N.A.

Abstract
    The aim of this study is to analyse the co-occurrence of the encrusting sponge Iophon proximum and other sessile organisms on the shells of the Patagonian scallop, Psychrochlamys patagonica, and the relationship between scallop size and the presence of this sponge. Scallops were collected from four beds distributed along the 100-m depth isobath on the continental shelf off Argentina (south-western Atlantic). Statistically significant avoidance was observed between I. proximum and all other groups of sessile invertebrates. Co-occurrence of bryozoans, foraminiferans, folliculinid ciliates, hydrozoans, octocorals and spirorbid, serpulid and sabellarid polychaetes on valves not monopolized by I. proximum produced significant clumping, which, however, almost ceased to occur when only valves without this sponge were analysed. In Patagonian beds, valves monopolized by I. proximum were significantly smaller than those in which the sponge was absent (valve height, mean ±SE, with I. proximum: 54.1 ±1.74 mm, without I. proximum: 60.4 ±0.62 mm). This is the first study to report a significantly smaller size in sponge-covered scallops compared to those without sponges.

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