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首页> 外文期刊>Ecological research >Carbon and nitrogen stable isotope ratios of macroinvertebrates in the littoral zone of Lake Biwa as indicators of anthropogenic activities in the watershed
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Carbon and nitrogen stable isotope ratios of macroinvertebrates in the littoral zone of Lake Biwa as indicators of anthropogenic activities in the watershed

机译：琵琶湖沿岸带大型无脊椎动物的碳氮稳定同位素比，作为流域人为活动的指标

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摘要

Carbon and nitrogen stable isotope ratios (δ~(13)C and δ~(15)N) of macroinvertebrates inhabiting littoral zones of lakes can serve as useful indicators of material loading from the watershed. We collected snails (Semi-sulcospira spp.) and bivalves (Unio douglasiae biwae Kobelt) from 29 littoral sites in Lake Biwa near the mouths of river tributaries with various human population density (HPD) and land-use patterns. The δ~(13)C and δ~(15)N signatures were determined for three potential food sources: particulate organic matter in the pelagic zone (PPOM), riverine particulate organic matter from tributaries (RPOM) and epilithic organic matter in the littoral zone (EOM). The stable isotope mixing model revealed that snails relied mainly on EOM, and bivalves on PPOM and RPOM. Multiple regression analysis showed that intersite variation in δ~(15)N for snails was best explained by HPD, while variation in δ~(15)N of EOM and nitrate was explained to a lesser extent by HPD. Comparison with isotope signatures of their food sour-rnces and riverine nutrients revealed that snails assimilated anthropogenic nitrogen from wastewater in the watershed. Our results also showed that the δ~(13)C value of bivalves was marginally related to the fraction of paddy fields in the watersheds. In conclusion, the isotope signatures of macroinvertebrates inhabiting the littoral zone can be useful indicators of anthropogenic impacts from the watershed.
机译：居住在湖泊沿岸带的大型无脊椎动物的碳氮稳定同位素比（δ〜（13）C和δ〜（15）N）可作为流域物质负荷的有用指标。我们从比瓦湖支流河口附近29个沿岸地点采集了蜗牛（Sul-sulcospira spp。）和双壳类动物（Unio douglasiae biwae Kobelt），它们具有不同的人口密度（HPD）和土地利用方式。确定了三种潜在食物来源的δ〜（13）C和δ〜（15）N标记：中上层带中的颗粒有机物（PPOM），支流沿江的颗粒性有机物（RPOM）和沿岸的上石器质有机物区域（EOM）。稳定的同位素混合模型显示，蜗牛主要依赖于EOM，而双壳类则依赖PPOM和RPOM。多元回归分析表明，用HPD可以最好地解释蜗牛的δ〜（15）N的位间变化，而用HPD可以较少地解释EOM和硝酸盐的δ〜（15）N的位错。与它们的食物中的酸和河流营养素的同位素特征进行比较后发现，蜗牛吸收了流域废水中的人为氮。我们的研究结果还表明，双壳类动物的δ〜（13）C值与流域中稻田的比例略有相关。总之，居住在滨海带的大型无脊椎动物的同位素特征可以作为流域人为影响的有用指标。

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  • 来源
    《Ecological research》 |2010年第4期|P.847-855|共9页
  • 作者

    Zinichi Karube; Yoichiro Sakai; Tomohiro Takeyama; Noboru Okuda; Ayato Kohzu; Chikage Yoshimizu; Toshi Nagata; Ichiro Tayasu;

  • 作者单位

    Center for Ecological Research, Kyoto University,2-509-3 Hirano, Otsu, Shiga 520-2113, Japan;

    rnCenter for Ecological Research, Kyoto University,2-509-3 Hirano, Otsu, Shiga 520-2113, Japan;

    rnCenter for Ecological Research, Kyoto University,2-509-3 Hirano, Otsu, Shiga 520-2113, Japan Graduate School of Science and Technology, Niigata University,8050 Igarashi 2-Nocho, Nishi-ku, Niigata 950-2181, Japan;

    rnCenter for Ecological Research, Kyoto University,2-509-3 Hirano, Otsu, Shiga 520-2113, Japan;

    rnCenter for Ecological Research, Kyoto University,2-509-3 Hirano, Otsu, Shiga 520-2113, Japan Japan Science and Technology Agency,2-509-3 Hirano, Otsu, Shiga 520-2113, Japan National Institute for Environmental Studies,16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan;

    rnCenter for Ecological Research, Kyoto University,2-509-3 Hirano, Otsu, Shiga 520-2113, Japan Japan Science and Technology Agency,2-509-3 Hirano, Otsu, Shiga 520-2113, Japan;

    rnCenter for Ecological Research, Kyoto University,2-509-3 Hirano, Otsu, Shiga 520-2113, Japan Ocean Research Institute, University of Tokyo,1-15-1 Minamidai, Nakano-ku, Tokyo 164-8639, Japan;

    rnCenter for Ecological Research, Kyoto University,2-509-3 Hirano, Otsu, Shiga 520-2113, Japan;

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  • 正文语种 eng
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  • 关键词

    material loading; lake biwa; eutrophication; stable isotope; benthos;

    机译：物料装载;琵琶湖富营养化稳定同位素便当;

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