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Spatial dietary shift of the intertidal snail, Batillaria multiformis: stable isotope and gut content analyses

文献类型： 外文期刊

作者： Yokoyama, Hisashi 1 ; Fu, Jing 2 ; Tamura, Yuji 3 ; Yamashita, Yoh 1 ;

作者机构： 1.Kyoto Univ, Field Sci Educ & Res Ctr, Sakyo Ku, Kyoto 6068502, Japan

2.Kyoto Univ, Grad Sch Global Environm Studies, Sakyo Ku, Yoshida Honmachi, Kyoto 6068501, Japan

3.Oita Prefectural Agr Forestry & Fisheries Res Ctr, Shallow Fresh Water Grp, Fisheries Res Div, Oita 8790608, Japan

4.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, 300 Jungong Rd, Shanghai 200090, Peoples R China

5.Oita Prefectural Agr Forestry & Fisheries Res Ctr, Fisheries Res Div, Saiki, Oita 8792602, Japan

关键词： Bayesian mixing model; benthic diatom; gastropod; intertidal flat

期刊名称：PLANKTON & BENTHOS RESEARCH （ 影响因子：0.623； 五年影响因子：0.743 ）

ISSN： 1880-8247

年卷期： 2019 年 14 卷 2 期

页码：

收录情况： SCI

摘要： In order to identify the food sources of the intertidal snail, Batillaria multiformis, stable isotope (delta C-1(3), delta N-15) and gut content analyses were conducted. Snails and their possible food sources were collected from the riversea transects at the mouths of the Iroha and Katsura rivers in northeastern Kyushu, Japan, which differ in land use parameters (e.g., the ratio of agricultural area in the catchment area). There was a shift in the delta C-1(3) of the snail along the transects, showing higher values at the upstream stations (-15.8 and -14.8 parts per thousand) and lower values (-17.5 and -17.1 parts per thousand) at the seaward stations. The delta N-15 showed no significant spatial gradient along the transects, but a significant difference was observed (t-test, p<0.001) between the Iroha (mean, 10.0 parts per thousand) and Katsura (11.1 parts per thousand) rivers. A Bayesian mixing model and the biomass of possible food sources on the tidal flats showed that (1) the major food sources were marine phytoplankton, seaweeds, and benthic microalgae, and that (2) the dependency on marine phytoplankton increased in the seaward stations. However, gut content analysis revealed that most of the identifiable dietary items across all stations were benthic diatoms, which is considered to be due to the short-term result of ingestion on the sediment surface at low tide. Increasing dependency on phytoplankton at seaward stations was considered to be due to consumption of suspended particles in the water column at high tide by filter feeding. Differences in the delta N-15 between the two rivers suggest the possibility of using the delta N-15 of snails as an indicator of watershed characteristics.

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