Download e-book for iPad: Ecology of Insect Vector Populations by R. C. Muirhead-Thomson

By R. C. Muirhead-Thomson

ISBN-10: 1483231690

ISBN-13: 9781483231693

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F o r e x a m p l e , e x p e r i m e n t s w e r e carried o u t o n An. melas in W e s t Africa in w h i c h t h e a t t r a c t i o n of a fixed n u m b e r of a n i m a l hosts (three to four goats, o n e pig a n d o n e cow) was c o m p a r e d w i t h a n increasing n u m b e r of h u m a n s from t w o to four, a n d finally to six. U n d e r those conditions t h e p r o p o r t i o n of mosquitoes a t t r a c t e d to t h e a n i m a l hosts fell from 6 2 % to 1 0 % , a n d finally to 2 % , respectively, of t h e total ( M u i r h e a d - T h o m son, 1951).

3. 80% 4. A N O P H E L I N E MOSQUITO VECTORS OF MALARIA 41 T h e s e figures show strikingly h o w t h e r o u g h l y e q u a l distribution of bites b e t w e e n h u m a n b a i t a n d t h e single a n i m a l is violently upset b y t h e a d d i t i o n of one m o r e a n i m a l , t h e p r o p o r t i o n a t t r a c t e d to m e n falling to 2 0 % of t h e total. W i t h r e g a r d to t h e use of b o t h i n d o o r a n d o u t d o o r b a i t catch, some observations o n anophelines h a v e s h o w n t h a t , w i t h some species, seasonal variations in t h e degree of i n d o o r versus o u t d o o r b i t i n g m a y necessitate special care in using such s a m p l i n g m e t h o d s to i n d i c a t e g e n e r a l t r e n d s in p o p u l a t i o n density.

I n J a m a i c a for e x a m p l e a simple t r a p h u t of exactly t h e s a m e design as h a d previously b e e n used successfully in Africa, was b a i t e d w i t h a d o n k e y a n d p r o v e d e x t r e m e l y a t t r a c t i v e to Anopheles albimanus ( M u i r h e a d - T h o m s o n a n d M e r c i e r , 1952). I n I n d o n e s i a it was found t h a t t h e h u m a n - b a i t e d t r a p h u t or e x p e r i m e n t a l h u t w a s suitable for o n e of t h e local vectors of m a l a r i a , Anopheles sundaicus, b u t n o t for t h e o t h e r vector, An.

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Ecology of Insect Vector Populations by R. C. Muirhead-Thomson


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