| Accession number;04A0714053 |
| Title;Effect of a net spinning caddisfly (Trichoptera: Stenopsyche marmorata) on cobble substrate stability in northern Japanese streams |
| Author;NUNOKAWA M(Hokkaido Univ.) GOMI T(Univ. British Columbia) NEGISHI J N(National Univ. Singapore) TAKAO A(Kyoto Univ.) NAKAHARA O(Wako Giken Ltd.) |
Journal Title;Suikei Kozo to Ryuiki Dotai ni Motozuku Mizu, Dosha Ryushutsu Kiko to Saigai Kankyo ni kansuru Kenkyu Heisei 12-15 Nendo No.12306008
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Journal Code:N20041657
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ISSN:
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VOL.;NO.;PAGE.170-172(2004)
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| Figure&Table&Reference;FIG.6, TBL.1, REF.13 |
| Pub. Country;Japan |
| Language;English |
| Abstract;It was examined what kind of effect the network of the nest spun by the caddisfly causes on stability of the waterway in the river with the gravel bed in Hokkaido.As a result, the following findings were obtained: 1) On an average, the 3-fold force is needed in order to move the cobble with the network of the nest of the caddisfly, as compared with a case of the cobble without the network.But although the strength of the nest network is different depending on the nest, 2) the force required to move the material(particle) of the river bed is mutually related to the density of the caddisfly larvae.3) The flow velocity which starts to move gravels or cobbles becomes 2- to 14-fold, when the strength of the nest network is considered, as compared with when not considered.4) It is considered that the Stenopsyche larvae connect rough gravels and cobbles by the silky networks, raising stability of the river beds. |
