Tuesday, May 27, 2008
262

Trophic pathways of macrobenthos in relation to vegetation types on the floating mat in mizoro-ga-ike pond, Kyoto City, Japan

Yoshikazu Kato1, Noboru Okuda2, Ichiro Tayasu2, Yasuhiro Takemon3, and Michio Hori1. (1) Department of Zoology, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto, Japan, (2) Center for Ecological Research, Kyoto University, 509-3, Hirano 2-chome, Otsu, Japan, (3) Water Resources Research Center, Kyoto University, Goka-sho, Uji, Japan

Macrobenthos communities and trophic pathways were compared among vegetation types on the floating mat (the bog) in Mizoro-ga-ike pond (35°03'N, 135°50' E; 75 m asl; 9 ha area), Kyoto City, Japan. The δ13C values of benthic particulate organic matter (BPOM) differed among three vegetation types: lawns dominated by Sphagnum palustre, hollows dominated by S. cuspidatum and hollows dominated by vascular plants. This result is useful to estimate food sources of macrobenthos. In summer, the δ13C values of detritivores (main species were Helochares pallens and H. striatus, Hydrophilidae) were different in relation to vegetation types even though in the same species. In flat bogs, the organic matter produced by plants deposits as sedentary material. Therefore our results indicate that the main food sources of these detritivores were derived from the in situ detritus. It suggests that trophic pathways of macrobenthos may differ in relation to vegetation types. We will show the food webs of each vegetation type and consider the relationship between food webs of macrobenthos and the processes for forming or maintaining the vegetation type.


Web Page: bog, food webs, stable isotope

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