Feeding Traces on the Kelp Laminaria religiosa by Four Species of Small Herbivorous Gastropods
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概要
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To clarify the effects of small herbivorous gastropods on the kelp <I>Laminaria religiosa</I>, we examined feeding traces left on the kelp by gastropods, and the morphology of gastropod radula. We conducted laboratory experiments with four species of the small herbivorous gastropods, <I>Chlorostoma lischkei</I>, <I>Omphalius rusticus rusticus</I>, <I>Homalopoma amussitatum</I> and <I>Littorina sitkana</I>, which frequently occur in habitats of <I>L. religiosa</I> in Hokkaido, Japan, to examine feeding traces left on a sheet of kelp gametophytes settled on styrene chambers or glass slides. In the experiments, all gastropod species fed on the kelp gametophytes both on the styrene chamber and the glass slide. We observed species-specific differences in feeding traces among gastropod species that were considered to be because of differences in the species-specific morphology and size of their radula and differences in feeding patterns. We observed similar traces in adult <I>L. religiosa</I> collected from its natural habitat in Esashi, Hokkaido, to those in our laboratory experiments, suggesting that the four gastropod species used in this study feed on the surface of the adult kelp.
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日本水産増殖学会 | 論文
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