An artificial substrate for the quantitative comparison of the densities of larval simuliid (Diptera) populations

Abstract

1974. An artificial substrate for the quantitative comparison of the densities of larval simuliid (Diptera) populations. Can. J. Zool. 52: 773-775.The use of a I0 X 10 cm, unglazed, ceramic, fireplace tiIe for the quantitative comparison of the population densities of immature simuliids in a variety or stream conditions throughout the year IS descrikd. Comparisons with other techniques described in the literature are given In vlew of the numerolls techniques reported, it is recommended that researchers in this held use a standard metlrodology for obtaining population numbers of immature simuliidr; it 1s suggested that this tech~lique could Ix such a standard. LEWIS, D. J., et G. F. BENNETT. 1974. An artificial substrate for the uantitative comparison of the densities of larval simuliid (Diptera) populations. Can. ~.%ool. 52: 773-775. On dCcrit ici une mCthode servant h la comparaison quantitative des densitCs de population de sirnuliidCs immatures en eau courante, dans des conditions variCes durant toute l'ann6e; il s'agit d'utiliser des tuiles B foyer en ctramique sans gla~ure, mesurant 10 X 10 cm. Cette mCthode est comparCe 51 d'autres techni ues connues. Vu la grande variCtC des techniques, on suggkre aux chercheurs d'utiliser une mCPhode standard pour obtenir un estimC des populations de simuliidCs immatures; la technique dCcrite ici pourrait aisCment servir de mCthode standard. [Traduit par le journal]

Evaluation of the impact of Bacillus thuringiensis serovar israelensis and Temephos, used for the control of Simulium (Chirostilbia) pertinax Kollar, 1832 (Diptera, Simuliidae) on the associated entomofauna, Paraty, state of Rio de Janeiro, Brazil

“…To collect associated entomofauna, six artificial substrata (fiberglass plates, 0.33 by 0.22 m each, with an internal lead ballast to prevent their dislodgement) had been placed as a chain, from one to the other margin of the river, into each sampling site 30 days previously. These artificial substrata are modified, more durable versions of the ceramic ones recommended by Lewis and Bennett (1974).…”

Observations on the settling of Simulium damnosum larvae on artificial substrates, in the Ivory Coast

“…The sampling of pre-imaginal blackflies using SASUs has been reviewed by Disney (1972) and . Lewis & Bennett (1974) The SASUs included io x io cm ceramic tiles (Zahar, 1951), heavy duty polythene sheets (5 x 2o cm), nylon fishing line (40-cm lengths) and natural substrates (Pandanus leaves, and wood) of standard area . The tiles were glazed on one side, but the larvae showed no preference for either surface and were collected from the glazed surface from which they could more easily be scraped .…”

Colonization of Immature Black Flies (Diptera: Simuliidae) on Artificial Substrates in a Nebraska Sandy River

“…Unglazed tiles, proposed by Lewis & Bennett (1974) as a possible standard, are perhaps the most widely used. However, tiles are unsuitable for even short exposures in the shifting sand bottom streams of Nebraska and were found unsuitable by Boobar & Granett (1978) for some species that normally colonize only vegetation.…”

“…More valid is that time required to achieve densities per unit area of substrate the same as densities occurring on natural substrates (e.g., Lewis & Bennett 1974). However, where vegetation is the primary natural substrate not only are densities difficult to determine but different observed densities are just as likely because of local or temporal changes in the substrate.…”