Fauna of aquatic insects with identification keys in tributaries of Minami-Tawa River, Hokkaido, Japan
2018
Nakagawa, H. (Kyoto University (Japan). Field Science Education and Research Center) | Sato, T.
We identified aquatic insects captured at 6 tributaries in Minami-Tawa River that flows through the Hokkaido Research Forest, Kyoto University in Sibecha, Hokkaido, Japan from June to October 2013. Totally 71 taxa consisting of 54 genera, 26 families, and six orders of aquatic insects and five taxa of other macroinvertebrates were identified from the samples. The faunal structure varied among tributaries and the number of observed taxa was larger in tributaries located at an upper reach of Minami-Tawa River than these at a lower reach. The number of taxa observed was also changed among seasons and was largest in June. Particle organic material (POM) feeders and carnivores dominated in this ecosystem. More than half of the observed taxa was classified into POM feeders and shredder feeders, which are generally part of the members of the detritus food web. This pattern may indicate a high contribution of terrestrial organic materials, such as leaf litter and woody debris, as an energy source at the headwater ecosystems of Minami-Tawa River. In addition, we made an identification key to classify the samples obtained in this research, which will be useful for future studies and education in this research forest. Note that some species that were not observed in this study and that sampled from other than the Minami-Tawa River in the Hokkaido Research Forest might be misidentified in the usage of this key.
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