vertical distribution of Culicoides impunctatus larvae

Soil cores were taken from three transects, representing the vegetation typical of much of the west coast and Highlands of Scotland, in an attempt to investigate the distribution of Culicoides impunctatus larvae. Sampling of soil cores was carried out at four periods throughout the day (00.00, 05.00...

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Bibliographic Details
Published in:Medical and veterinary entomology 1997, Vol.11 (1), p.45-48
Main Authors: Blackwell, A, King, F.C
Format: Article
Language:English
Subjects:
Animals
Ceratopogonidae
Culicoides impunctatus
diurnal variation
Freshwater
Larva
larvae
larval behaviour
microhabitats
migration
soil
soil depth
spatial distribution
vertical migration
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Summary:Soil cores were taken from three transects, representing the vegetation typical of much of the west coast and Highlands of Scotland, in an attempt to investigate the distribution of Culicoides impunctatus larvae. Sampling of soil cores was carried out at four periods throughout the day (00.00, 05.00, 12.00 and 17.00 hours). Each core sample was sliced into sections, 1 cm deep and Culicoides impunctatus larval numbers in the first 8cm of the soil core were investigated, using a sugar-flotation technique. At all sampling times, approximately 50% of the total numbers of larvae recovered were from the first 2cm of the soil. During the daylight sampling periods (05.00, 12.00 and 17.00 hours), there was a small but significant migration of larvae into the deeper layers (25 cm). The results are discussed in relation to those for other species from previous studies, and also to their application in larval collection for colonization techniques and in localized Culicoides control.
ISSN:0269-283X
1365-2915
DOI:10.1111/j.1365-2915.1997.tb00288.x