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Bathymetric distribution of chironomid larvae Diptera Chironomidae in Lake Saiko, Japan



Bathymetric distribution of chironomid larvae Diptera Chironomidae in Lake Saiko, Japan



Lakes & Reservoirs: Research & Management 17(1): 55-64



The distribution of benthic macroinvertebrate on 8 March 29 was studied in Lake Saiko (73.2 m maximum depth). The average density of the benthic community for the entire lake was 19 583 individuals m?2, being comprised of oligochaetes and chironomid larvae, with densities of 18 163 (92.8%) and 1274 (6.5%), respectively. The average wet weights of oligochaetes and chironomid larvae were 15.96 and 1.67 g m?2, respectively. The oligochaetes inhabited the entire lake bottom, with their densities being higher in the transitional region (2 4 m) and deeper region (>4 m) than in the shallower region. However, the densities of chironomid larvae were low in the deeper region (>4 m), with only a few chironomid larvae being found in the centre of the lake (>6 m). The most abundant species (Micropsectra chuzeprima) exhibited the widest distribution (from 1.1 to 65.5 m depth), followed by Polypedilum nubeculosum. The results of this study also were compared to previous data on oligochaetes and chironomid larvae reported by Kitagawa (1973). The density of these animals increased throughout the whole lake in 29. However, the chironomid species compositions did not changed. The larval distribution pattern of chironomid changed since Kitagawa s study, being distributed from 11 to 68 m in 1973. In contrast, almost all chironomid larvae were found in the transitional (e.g. M. chuzeprima) and shallower (e.g. Procladius choreus and P. nubeculosum) regions in 29, with only a few individuals being observed in the deeper regions (>6 m). In contrast, the oligochaete density increased in the deeper regions. Large environmental changes must have affected the oligochaetes and chironomids densities, especially in the deeper regions with low dissolved oxygen concentrations. Consequently, the distribution pattern of oligochaetes and chironomids in the lake has changed. These study findings suggest the lake is experiencing increasing eutrophication.

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Accession: 036347266

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DOI: 10.1111/j.1440-1770.2012.00495.x


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