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Article type: Cover
2001 Volume 51 Issue 1 Pages
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Article type: Index
2001 Volume 51 Issue 1 Pages
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Article type: Appendix
2001 Volume 51 Issue 1 Pages
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Hiroshi SAIJO
Article type: Article
2001 Volume 51 Issue 1 Pages
1-11
Published: April 25, 2001
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Faunal composition and seasonal changes in the number of aquatic Coleoptera and Hemiptera were investigated in paddies and an adjacent irrigation pond in Shimane Prefecture, Japan. The paddies held water from mid April to mid June, and then were irrigated intermittently until the end of August. The irrigation pond was filled with water throughout the year. Twenty-two species of Coleoptera and nine species of Hemiptera were collected from both the paddies and the pond. The number of species of adult insects in the paddies increased from May to June, then gardually decreased toward autumn. In contrast, the number in the pond was highest during autumn. The number of species of larval insects was high in paddies especially from May to July, but low in the pond throughout the year. Thirteen of the aquatic insect species observed were classified into four types on the basis of their habitat utilization pattern : A) those using the pond for both non-reproductive and reproductive purposes, B) those using the pond as the main habitat and the paddies for reproduction, C) those using both the pond and paddies as a living habitat and also the paddies for reproduction, and D) those using the paddies for both non-reproductive and reproductive purposes. Paraplea indistinguenda was the only species belonging to type A, and stayed in the irrigation pond throughout the year. Hyphydrus japonicus, Laccophilus difficilis, Cybister brevis, Cybister japonicus, Hydrophilus acuminatus, Ranatra chinensis and Notonecta triguttata were type B insects. Their adults immigrated (probably from the pond) into the paddies and reproduced from May to July. The new adults then migrated to the irrigation pond before the watered area of the paddies dried up. Type C included Agabus conspicuus, Rhantus suturalis and Appasus major. Laccotrephes japonensis and Sigara sp. were classified as type D, and they were seldom found in the pond. My observations indicate that paddies play an important role in the reproduction of aquatic Coleoptera and Hemiptera, whereas the pond provides stable habitat for non-reproductive stages, as well as a place for reproduction of some species. This means that the coexistence of paddies and ponds is important for the species richness of aquatic insects in this region
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Shiro TSUYUZAKI
Article type: Article
2001 Volume 51 Issue 1 Pages
13-22
Published: April 25, 2001
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There are many active volcanoes that affect plant community development worldwide, in particular the Pacific Ring of Fire. A number of studies have attempted to clarify the machanisms of primary succession in the early stages of volcanic succession. Here I summarize the findings of this research, focusing on : 1) plant sources including survivors, 2) safe sites for seedling emergence and establishment, 3) abiotic factors and tolerance, 4) biotic interactions (plant-animal, plant-plant, and plant-fungi/microorganism relationships), 5) stochastic event and chance, and 6) climatic effects. Alien plants often invade the denuded areas. The importance of the above mechanisms is strongly related to the scale, frequency and type of eruption(s), and thus the plant community dynamics differ greatly among volcanoes. I recommended that studies based on permanent plots and pre-eruption surveys should be promoted to obtain direct data related to the dynamics.
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Kimio HIRABAYASHI, Nobutada NAKAMOTO
Article type: Article
2001 Volume 51 Issue 1 Pages
23-40
Published: April 25, 2001
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Previous reviews on chironomid studies mainly dealt with lake profundal works, with emphasis on larval distribution and life histories. This review focuses on waterfronts (i.e. shallow waters and shores including adjacent terrestrial area) as habitats for Chironomidae and summaries recent works on the ecology of both larvae and adults. Shore zones encompass different types of habitat for chironomids, including rocky, stony, sandy and silty substrates, emerged and submerged vegetation and wood, and aquatic animal bodies. It is known that areas with aquatic plants tend to support the largest number of chironomid species and therefore constitute the most important habitat for them. The abundance and types of vegetation are considered to influence the diversity of chironomid assemblages. Chironomids of non-conventional waterfront habitats such as semi-terrestrial zone, wetland areas and rice paddies have so far received little reserach effort in Japan. Their biological characteristics were briefly reviewed. Recent works on the use of chironomids as environmental indicators were reviewed, with particular reference to waterfront habitats. Consideration was given to the current status and future prospects of chironomid studies in Japan. As research on chironomids in waterfront habitats is still in its infancy in Japan, there is a need for further works including the establishment of national registry/management of type specimens.
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Eiiti KASUYA
Article type: Article
2001 Volume 51 Issue 1 Pages
41-43
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[in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
45-
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[in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
45-47
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[in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
47-
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[in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
47-48
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Article type: Appendix
2001 Volume 51 Issue 1 Pages
49-
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[in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
50-
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A.C. WILLIAMS, B.C. MCCARTHY
Article type: Article
2001 Volume 51 Issue 1 Pages
50-
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[in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
50-
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[in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
50-
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[in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
50-51
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[in Japanese], [in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
51-
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
51-
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[in Japanese], [in Japanese], T. PARTOMIHARDJO, [in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
51-
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[in Japanese], [in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
51-52
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2001 Volume 51 Issue 1 Pages
52-
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[in Japanese], [in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
52-
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[in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
52-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2001 Volume 51 Issue 1 Pages
52-
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[in Japanese], [in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
53-
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J. TRAVIS
Article type: Article
2001 Volume 51 Issue 1 Pages
53-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
2001 Volume 51 Issue 1 Pages
53-
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Article type: Appendix
2001 Volume 51 Issue 1 Pages
58-
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Article type: Cover
2001 Volume 51 Issue 1 Pages
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Article type: Cover
2001 Volume 51 Issue 1 Pages
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