University of Khartoum

A Contribution to the Knowledge of the Tabanidae of the Sudan

A Contribution to the Knowledge of the Tabanidae of the Sudan

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Title: A Contribution to the Knowledge of the Tabanidae of the Sudan
Author: Yagi, Ali Ibrahim
Abstract: Surveys were initiated in 1964 in Messereyia area, Kordofan Province, Sudan for collection and determination of adults and immature tabanids species and study of its distribution. The bionomics and habits of I. biguttatus, I, taeniola. A. agrestis and Ancala latipes were also studied. Field ecological observations on general features of the area with special reference to adults and immature stages of tabanids and the nature of aestivation were investigated. Responses of adults to chemical attractants were tested by the use of improvised lure traps. The seasonal abundance of adults of the different species was also studied for three seasons. As regards natural enemies, a microbial micro-organism was isolated from immature tabanids and a predatory fish was also found in the tabanid larval habitat. In the course of survey in Messeryia District, eight species were recorded and identified as Ancala latipes Mac., Atylotus agrestis Wied, A. fuscipes Ricardo, Tabanus biquttatus Wied, T.gratus Loew, T.taeniola Pal de B., Chrysops pusillulus Austen and Philoliche magrettii Bezzi. General descriptions of adult and immature stages of Ancala latipes, Tabanus beguttabus, T. taeniola and Atylotus agrestis are given. Laraval and pupal keys are also presented for ready identification of A. agrestis, T. biguttatus and T. taeniola in the field. Descriptions are supported by drawings of taxonomic characters. The larval and pupal habitats of common species are distinguished and descriptions are given. T. taeniola, T. biguttatus, A. agrestis and A. latipes were reared to adult stage from field collected eggs. The use of chemical attractants, methyl eugenol, trimedlure and cuelure had indicated that at least the male of one species, viz T. taeniola were attracted mainly by trimedlure. Four ecological zones were distinguished by the type of vegetation and the distribution of adults within these regions was investigated. The seasonal abundance of adults was studied for three seasons. T. taeniola seems to be the most dominant species that occurred throughout the year. The distribution of the larvae and their preference to different types of habitats and method of aestivation was also studied to some extent. Natural infection of larvae of T. taeniola and T. biguttatus by B. subtilis indicated that epizootics can be created artificially under high population stress. As regards predators, a small fish identified as Nothobranchius sp. was found feeding on the larvae of T. taeniola, in "Rahads". This fish is considered as a potential natural enemy of importance in this area
Description: 224 Pages
URI: http://khartoumspace.uofk.edu/123456789/16873
Date: 2015-11-04


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