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FEEDING BY BLACKFLY LARVAE (DIPTERA, SIMULIIDAE) FORMING DENSE AGGREGATIONS AT LAKE OUTLETS

WOTTON, RS; (1992) FEEDING BY BLACKFLY LARVAE (DIPTERA, SIMULIIDAE) FORMING DENSE AGGREGATIONS AT LAKE OUTLETS. FRESHWATER BIOL , 27 (1) 139 - 149.

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Abstract

1. Larvae of Simulium noelleri formed dense aggregations (> 60 larvae cm-2) at a lake outlet where water passed in a very thin film vertically over wooden planks. Despite the high densities there was sufficient space between larvae to allow water to flow within an aggregation as well as over its surface.2. Small larvae, occluded within an aggregation, had a faster midgut throughput rate than larger larvae. Both had rates that were similar to those recorded in the literature for a range of habitats and species. The same relationship of throughput rate and larval size was maintained from upstream to downstream across 20 cm of an aggregation.3. Material passed through the midgut of larvae of a given size at a constant rate, indicating that assimilation efficiency of the whole gut contents was low.4. By colour-banding larval gut contents with fluorescent dye it was possible to demonstrate that faecal pellets are a component of the larval diet in the dense aggregations, especially of small larvae.5. The abundance of four easily identifiable components of the lake seston were measured from water samples above, and below, a larval aggregation. Particles with a mean diameter of 40-mu-m, or greater, showed significant reductions in numbers over a stream length of 6 cm. Particles of smaller size showed reductions but these were not significant.

Type: Article
Title: FEEDING BY BLACKFLY LARVAE (DIPTERA, SIMULIIDAE) FORMING DENSE AGGREGATIONS AT LAKE OUTLETS
Keywords: SESTON QUALITY, FILTER FEEDERS, STREAMS, RATES, FOOD, ASSIMILATION, TRICHOPTERA, INGESTION, TRANSPORT, DYNAMICS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
URI: http://discovery.ucl.ac.uk/id/eprint/138368
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