Population dynamics of epiphytic chironomid communities in the aquatic macrophyte zones of eutrophic Lakes Suwa and Kitaura

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概要

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• We studied the population dynamics of epriphytic chironomid larvae in the vegetated areas of Lakes Suwa and Kitaura. We quantitatively collected chironomid larvae from samples of the 4 species of angiosperms present in the lakes: the emergent plants phragmites australis (a reed) and Zizani latifolia; the floating plant Nymphoides peltata; and the submerged plant Potamogeton malaianus. Collections were made from all 4 plant zones in Lake Suwa from April 2000 to November 2000 and from the reed zone in Lake Kitaura from April 2000 to March 2001. In both lakes the most abundant chironomid Larvae on the reed stems from late May to September were Chironominae (especially, Dicrotendipes pelochloris and Glyptotendipes tokunagai). On the leaves of submerged and floating plants in Lake Suwa, Orthocladinae larvae (especially, Cricotopus trifasciatus) dominated during the sampling period. On the reed stems in Lake Suwa, mean larval density was 0.4 ind cm⁻² and biomass of epiphytic chironomids was 12.9μgcm⁻²; these values were 23% and 22%, respectively, of those in Lake Kitaura. The differences in chironomid abundance observed in the lakes seemed to be caused by differenes in food availability (i.e., abundance of algae attached to reed stem). The average of diversity index (1/λ,λ:Simpson's index) of chironomid larvae on each plant was 2.7-3.3 on reed and Z.latifolia. 1.8 on N. Peltata and 1.8 on P. malaianus from June to August. The differnces in diversity index may be correlated with the conditions of DO concentration during this period.

• 信州大学の論文
• 2004-02-28

著者

• HANAZATO Takayuki

  Research and Education Center for Inlandwater Environment, Shinshu University

• NAKAZATO Ryoji

  Center for Water Environment Studies, Ibaraki University

• Sakuma Masataka

  Research And Education Center For Inlandwater Environment Shinshu University

• Nakazato R

  Center For Water Environment Studies Ibaraki University

• SAJI Azumi

  Center for Water Environment Studies, Ibaraki University

• SAKURAI Hideaki

  Center for Water Environmental Studies, Ibaraki University

• Hanazato T

  Research And Education Center For Inlandwater Environment Shinshu University

• Hanazato Takayuki

  Research And Education Center For Inland Water Environment Shinshu University

• Saji Azumi

  Center For Water Environment Studies Ibaraki University

• Sakurai Hideaki

  Center For Water Environmental Studies Ibaraki University

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• Population dynamics of epiphytic chironomid communities in the aquatic macrophyte zones of eutrophic Lakes Suwa and Kitaura
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• Seasonal and spatial distribution of two Bosmina species (B. longirostris and B. fatalis) in Lake Suwa, Japan : its relation to the predator Leptodora

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