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• W2183630317 abstract "111 the temporary river N’Zi -an uffluent of the Bandama (Ivory Coast)- the population dynamics of four species of hydropsychid caddis flics, Cheumatopsyche spp., and Aethaloptera dispar, were folloured from January 1977 until March 1978. Prom June 1977 until December 1977 parts of the N’Zi were treated rvith fhe insecticide Chlorphoxim (organophosphate compound) in order to evaluate the effects of such treatment on Simulium damnosum-lhe vecfor of human onchocerciasis in Wesf Africa-and on the non-large1 fauna. The hydropsychid larvae and pupae were obtained by using a Surber sampler, a tore sampler, and from qualitative samples, yielding a tolal of about 17,000 specimens. These tuere identified 10 the instar level. Densities ut the surface of the subsiraium as me11 as in fhe hyporheic habitat appear 10 be influenced by the dischar!e pattern. Decreasing discharge and consequently a reduction of areas with sufficient currenb produce increaszng larval and pupal densities per surface unit. It is suggested that zones with sufficient current, mhich are controlled by the morphology of the rapid in relation to a certain discharge and fo some exteni by the densify of luron1 tubes of A. dispar, deiermine the level of intra- and interspecific aggression betrveen the Cheumatopsyche spp. and thereby leacls 10 changes in relative abundances of the species and probably their instars. Tt’hile A. dispar is no1 able to survive the periods mithout flow in ils aquatic stage, Cheumatopsyc.he spp. cari,, probably in the remaining stagnant pools. The instar disiribution as lue11 as the changes in the mean lveighf of the Cheumatopsyche spp. srrggesi thai a period of increased reproduciion occurs after reswmhg flolv and ut the end of the spate of the main rainy season. Undoubtedly the larval life of fhe species skrdied here lasis longer than is generally assumed for insects of tropical rivers, and probably only trvo or three generations per year occur. The resulis are discussed in relation to the secomlary producfivity of African streams. Since a11 four species are seriously affected by fhe chlorphoxim treatment, their disappearance is briefly discussed in relation to the consequences for the ecosystem, and especially fo the decrease in the predator pressure 011 Simulium damnosum." @default.
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• W2183630317 date "1982-01-01" @default.
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• W2183630317 title "Population dynamics of Hydropsychidae (Insecta ; Trichoptera) in the N'Zi River (Ivory Coast), a temporary stream partly treated with the insecticide Chlorphoxim ~1" @default.
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