(32): 91-100, Mar. 2011 Takaaki Torii, Kazuhisa Saitou and Masao Himura: Benthic Macro-Invertebrate Fauna of the Sagami River System, and Cluster Analysis for Grasping the River Ecosystem on Basin Scale Abstract. We investigated the benthic macro-invertebrate fauna at 40 sites of the Sagami River System in Kanagawa Prefecture. 403 species belonging to 142 families were recorded, and 36 species were newly recorded to Kanagawa Prefecture. 7 alien species and 16 endangered species were confirmed during this study. Numbers of Taxa, ASPT (Average Score Per Taxa) values based on Biological Monitoring Working Party (BMWP) adopted for Japan, EPT (species numbers of Ephemeroptera, Plecoptera, Trichoptera families) suggest that water quality in 40 sites were good, and much better in upstream sites. According to the result of TWINSPAN analysis and relationship with the some environmental dates, Sagami River Systems can be divided into 4 types of river morphology. 14 22 2010, 2005 2 1994, 1997 1997 2006 5 91
2008 7 12 2 8 1 12 40 1 25 cm 25 cm NGG38 0.493 mm 3 D NGG38 0.493 mm 30 5, 2009 80 2 EPT EPT Biological Monitoring Working Party BMWP, 1992 10 ASPT EPT Ephemeroptera PlecopteraTrichoptera Davis et al. 1999 1 1 1 92
2 TWINSPAN Two Way Indicator Species Analysis MjM Software Design Windows PC-ORD Ver.4 (McCune and Medford, 1999) TWINSPAN, 1995 11 14 36 142 403 3 36, 2005;, 2006;, 2004;, 2007 PORIFERA Eunapius fragilis Radiospongilla cerebellata 1 1 2 CNIDARIA 1 2 PLATHELMINTHES 4 4 5 3 Dugesia japonica NEMERTINEA Prostoma sp. 1 1 1 1 1 3 NEMATOMORPHA Gordius sp. 1 1 1, 2006 MOLLUSCA 3 8 12 9 Luciola cruciata Semisulcospira libertina Corbicula sp. Corbicula leana Corbicula fluminea 93
3 94
3 95
ANNELIDA 7 10 32 23 Nais communis Fridericia perrieri Schmelz, 2003 2 Haplotaxis gordioides Lumbriculus sp. Cognettia sp. Marionina sp. Mesenchytraeus sp. Aulophorus sp. Chaetogaster diaphanus Dero sp. Nais barbata Nais bretscheri Nais elinguis Nais pardalis Ophidonais serpentina Pristina amphibiotica Pristina longiseta Pristina synclites Ripistes parasita Slavina appendiculata Stephensoniana trivandrana Ilyodrilus templetoni Limnodrilus hoffmeisteri 22 ARTHROPODA 16 111 346 217 318 92 79 92 25 70 20 56 16 Hydrodroma sp. Cyclothyas sp. Trichothyas sp. Oxus sp. Hygrobates sp. Neumania sp. Mideopsis sp. 7 Eoniphargus kojimai Rhyacophila itoi Potthastia montium Nanocladius asiaticus Polypedilum kamotertium Ochthebius japonicus Ochthebius nakanei 6 BRYOZOA Pectinatella magnifica 1 2 2 403 Girardia dorotocephala Potamopyrgus antipodarum Pseudosuccinea columella Physa acuta Crangonyx floridanus Procambarus clarkii Pectinatella magnifica 7 40 10 4 4 2005;, 2007;, 2008 9 Lymnaea truncatula Indoplanorbis exustus Corbicula spp. 1 10, 2006, 2007 Radix auricularia japonica Gyraulus chinensis spirillus Polypylis hemisphaerula Appasus japonicus Himalopsyche japonica Deuterophlebia nipponica II 6, 2006 Calopteryx atrata Mnais costalis Boyeria maclachlani Planaeschna milnei Sinogomphus flavolimbatus Macromia amphigena amphigena Acroneuria jouklii IB Sympetrum pedemontanum elatum Gyrinus japonicus Orectochilus punctipennis 96
11 16 10 6 1 2010 Mnais pruinosa 40 Baetis thermicus 1, 2010 39 0.2mg/L, 2010 3 71 3 8 144 5 143 26 143 40 4.9 3 13 8.0 24 8.0 6 7.8 EPT EPT 40 12 EPT 3 878 5 71 1171 EPT 3 EPT BOD SS TWINSPAN 2 2 TWINSPAN 1 3 TWINSPAN 97
3 TWINSPAN TWINSPAN 1 4 2 1 I 2 II 2 3 4 2 5 6 2 7 7 3 TWINSPAN TWINSPAN 2 16 ph BOD SS DO 3 98
Kruskal-Wallis Scheffe Kruskal-Wallis 4 15 15 Scheffe 5 BOD TWINSPAN 7 4 TWINSPAN Kruskal-Wallis :P 0.0001 5% 1 1 I 2 II 2 II 3 3 4 TWINSPAN 7 4 TWINSPAN 11 14 36 142 403 36 403 7 16 40 EPT TWINSPAN 2 4 4 3 7 4 5 TWINSPAN Scheffe 5% 1 99
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