Walsh, J. Frank, Cheke, Robert ORCID: 0000-0002-7437-1934 and Young, Stephen (2023) A field investigation of short-range dispersal by female Simulium damnosum s.l. Acta Tropica, 240:106863. pp. 1-6. ISSN 0001-706X (doi:https://doi.org/10.1016/j.actatropica.2023.106863)

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Abstract

Female Simulium damnosum s.l. were caught at a site in a savannah zone beside the Mono River in Togo and at varying distances westwards perpendicular to it in an experiment to investigate short-range dispersal by the flies. The numbers of flies caught and the percentages that were parous decreased with increasing distance from the river, the latter suggesting that nulliparous flies disperse on average further than parous flies. The decreases were quantified using statistically significant multiple regressions involving distances from the river and the days since the start of the experiment because there was much day-to-day variation, probably attributable to the flies’ gonotrophic cycles. For future modelling purposes a relationship between numbers caught and distance alone was also estimated for both numbers caught and parous rates. Of the different members of the S. damnosum species complex identified in larval samples, S. damnosum s.str. predominated (66.7%), with S. squamosum accounting for 25.5% and the Beffa form of S. soubrense for 7.8%, proportions that were not significantly different from those of adults identified at the river and 10 km away. A small sub-sample of dissected parous flies showedthat transmission was occurring at the riverside and at 10 km away from the river.

Item Type:	Article
Uncontrolled Keywords:	Onchocerciasis vectors; Simulium damnosum complex; transmission; dispersal; parous rates
Subjects:	G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > Q Science (General) S Agriculture > S Agriculture (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Natural Resources Institute Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Last Modified:	20 Feb 2023 10:08
URI:	http://gala.gre.ac.uk/id/eprint/38588

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