, Volume 20, Issue 1, pp 21–28 | Cite as

Seasonal changes in the biomass of floating leaved plant, Trapa spp., and its relation with a leaf beetle, Galerucella nipponensis, in Lake Inba, Japan

  • On Saito
  • Tatsuya Kobayashi
  • Maiko Hiroi
  • Masayuki Kawatsu
  • Shun Takagi
  • Jun Nishihiro
  • Maiko KagamiEmail author
Special Feature Ecological and limnological bases for management of overgrown macrophytes


Trapa spp. dominate many shallow eutrophic lakes in Japan, which must affect the nutrient dynamics in lakes. Trapa spp. are utilized by several animals, in particular the leaf beetle, Galerucella. To quantify the trophic links and material transfers between Trapa spp. and G. nipponensis, their seasonal dynamics, the amount of leaves being consumed, and carbon and nitrogen stable isotope ratios (δ13C and δ15N) in Lake Inba were tracked. Trapa spp. began to increase in May, reached their highest biomass in September, and disappeared in October. G. nipponensis exhibited continuous reproduction from May until October. Grazing by G. nipponensis did not seem to affect the abundance of Trapa, as the average percentage of Trapa leaf consumed was 3%. Rather, G. nipponensis was influenced by Trapa, as δ13C and δ15N of Trapa spp. and G. nipponensis showed very similar seasonal fluctuations. The difference in δ15N was 3–4‰, which indicates that Trapa leaves were a main food source for G. nipponensis and a trophic linkage exists between them. The estimated nitrogen and phosphorus amounts in Trapa corresponded to 1% of nitrogen and 18% of phosphorus in the entire lake. If G. nipponensis migrate and die in a terrestrial environment, G. nipponensis can transport certain nutrients from lake to terrestrial environments. The nutrients from Trapa spp. are mostly regenerated, except for that biomass transported to terrestrial ecosystems by humans.


Floating-leaved macrophyte Stable isotope ratio Plant-animal interactions 



This study was supported in part by JSPS KAKENHI grant number 25281052 and the River Fund in charge of River Foundation, Japan (23-1215-011).


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Copyright information

© The Japanese Society of Limnology 2018

Authors and Affiliations

  • On Saito
    • 1
  • Tatsuya Kobayashi
    • 1
  • Maiko Hiroi
    • 1
  • Masayuki Kawatsu
    • 1
  • Shun Takagi
    • 1
    • 2
  • Jun Nishihiro
    • 1
  • Maiko Kagami
    • 1
    • 3
    Email author
  1. 1.Faculty of Science, Department of Environmental ScienceToho UniversityFunabashiJapan
  2. 2.Institute of Natural and Environmental SciencesUniversity of HyogoHyogoJapan
  3. 3.Yokohama National University, Graduate School of Environment and Information SciencesKanagawaJapan

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