相模湾に生息するウミウシ類（ドーリス目）の食性

概要

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Seven species of doridacean sea slugs and 14 species of sponges obtained from two habitats in Sagami Bay were used to examine whether each doridacean is monophagous on a specific sponge. Spicules of sponges contained from the guts of the sea slugs andthose composed of sponge bodies were compared by SEM observation. As a result, Discodoris lilacina presumably feeds on Callyspongia confoederata and/or Haliclona permollis, and four species of sea slugs, Homoiodoris japonica, Dendrodoris rubra, Chromodoris orientalis, Hypselodoris festiva, probably feed on Halichondria okadai and/or Halichondria panicea, though H. festiva was previously thought to be monophagous on Dysidea sp. Platydorisspeciosa is likely to feed exclusively on a single sponge species that was not collectedin this study. Except for P. speciosa, the sea slugs examined here appeared to havefed on more than one sponge species.
2009-06-30