Abai, MR

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6th International Congress of DipterologySpecies microdistribution of larval Chironomidae (Diptera)on riverbed cobbles at riffles: a quantification usingartificial substratesInoue, E. (1), K. Kawai (2) & H. Imabayashi (2)(1) Department of Applied Biology, Faculty of Textile Science and Technology, ShinshuUniversity, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan(2) Laboratory of Aquatic Ecology, Graduate School of Biosphere Science, HiroshimaUniversity, 1-4-4 Kagamiyama, Higashihiroshima, Hiroshima 739-8528, JapanSpecies composition and density of chironomid larvae attached tostandardized artificial substrates placed on riffles were investigated inJapanese temperate low-order streams. The surfaces of the substrates,quartets of holed cubic blocks of concrete (L19×W19×H19cm), wereclassified into three types, i.e. ‘exposure’, ‘hollow’ and ‘interstices’, so thatthey might reflect different conditions in relation to the water flow. Thesubstrates were set in August 2003 then chironomid collection wasreplicated twice, in October and December 2003, in each stream. Atstreams with riparian canopy coverage where leaf litter was provided tobenthic macroinvertebrates as a food, larval density of Chironomidae on‘interstices’ reached 234.0 indiv.m -2 in average, about eight and ten timesas high as those on ‘hollow’ and ‘exposure’, respectively. As to speciesrichness, 12.3 species were attached on ‘interstices’ in average, about fourand five times as many as those on ‘hollow’ and ‘exposure’, respectively.Partial ReDundancy Analysis (RDA) where the environmental variablesother than the surface type, e.g. water temperature, depth, surface currentvelocity and specific conductance of streams, were used as covariablesrevealed that distribution of 9 species, i.e. Corynoneura celtica, Neobrillialongistyla, Polypedilum akisplendens, Polypedilum tamanigrum,Cladotanytarsus vanderwulpi and four Rheotanytarsus species, weresignificantly associated with ‘interstices’, while no species showedsignificant association both with ‘hollow’ and ‘exposure’. On the otherhand, at streams without riparian canopy, no significant difference wasfound both in species richness and density among the three surface types.In addition, both species richness and density at streams without riparian122
6th International Congress of Dipterologycanopy were much lower than those at streams with riparian canopy. Theseresults indicate that interstices in riverbed are the major microhabitat oflarval Chironomidae at riffles. Leaf litter caught in interstices would allowmost species to colonize at relatively higher density than on exposedsurfaces.Key Words: Chironomidae, riffles, microhabitat, artificial substrate,interstices∗∗∗∗∗∗∗∗∗∗123
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Abai, MR

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