Abstract
Quantitative samples of benthic invertebrates were collected from a sandy riverbed of a mountainous stream (Kozu site of Takami-gawa stream, Nara Prefecture), central Japan by core samplers in five sampling occasions through the years 2008–2009. A total of 120 taxa were identified, representing 55 families and 97 genera. Insects formed about 92% of the total recorded taxa and 88% of individuals’ abundance. A total of 111 taxa of aquatic insects, belonging to 49 families and 92 genera, were identified and represented by ten orders. Oligochaeta and Acari were dominant non-insect invertebrates. Diptera was the most diverse insect group, followed by Trichoptera and Ephemeroptera. Dominant taxa were mesoinvertebrates, younger stages of macroinvertebrates, both of which predominantly inhabit the interstitial zone of a sandy riverbed. Both taxon richness and invertebrate abundance were higher in February 2009 and lower in April and August 2008. A few major invertebrate taxa demonstrated distinct seasonal trends; i.e. Nymphomyia alba, Rheosmittia, and Corynoneura were abundant in February 2009. Newly hatched larvae of Larcasia akagiae were abundant in May 2008. This study also demonstrated the effectiveness of core samplers to collect small-sized benthic fauna that inhabit the interstitial or hyporheic zone of the sandy riverbed.
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Acknowledgments
The author thanks Professor K. Tanida, Laboratory of Ecology and Systematics, Osaka Prefecture University to provide all possible facilities to carry out this work and valuable suggestions on the study. Ms. T. Kyuka kindly checked and corrected the identification of chironomid larvae. Some materials of Trichoptera were also checked or identified by Dr. A. Taira. Field work was supported by Mr. K. Horikiri and K. Tanida. Ms. L. Tohidi kindly checked and improved the English text.
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Abdelsalam, K.M. Benthic macro- and meso-invertebrates of a sandy riverbed in a mountain stream, central Japan. Limnology 13, 171–179 (2012). https://doi.org/10.1007/s10201-011-0363-3
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DOI: https://doi.org/10.1007/s10201-011-0363-3