Entomology

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By World Health Organization

Vector-borne illnesses are a tremendous sickness in South-East Asia and in different components of the realm. There are approximately 4,500 mosquito species in life; species belonging to the Anopheles genus transmit malaria. scuffling with malaria is a part of the Millennium improvement pursuits, and vector keep watch over is a key approach either domestically and globally. hence, the overview and dissemination of knowledge on vector species is seriously vital. many of the anophelines which are desirous about the transmission of malaria in South and South-East Asia were pointed out as species complexes. participants of a species complicated are reproductively remoted evolutionary devices with detailed gene swimming pools and for this reason they fluctuate of their organic features. In 1998 WHO released Anopheline Species Complexes in South-East Asia. New id instruments were constructed because then, and hence this up-to-date variation was once wanted. It summarizes paintings that has been performed on anopheline cryptic species and may be hugely beneficial to researchers, box entomologists and malaria-control software managers.

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Extra info for Anopheline Species Complexes in South and South-East Asia (SEARO Technical Publications)

Example text

Species A and B (Green and Miles, 1980) Green and Miles (1980) found two distinct polytene X-chromosomes in the An. culicifacies s. l. population in the village Okhla near Delhi, India. One X-chromosome was with two paracentric inversions a and b and the other with a banding pattern that resembled the polytene chromosome photomap described by Saifuddin, Baker and Sakai (1978). No heterozygotes for these inversions were found. The absence of heterozygotes was taken as an evidence of reproductive isolation between the two populations which were considered as two distinct species.

The short arms of the sex chromosomes are smaller than those of species B. Polytene chromosomes A standard map of polytene chromosomes of speices A has been prepared and has been used in comparative studies of the chromosomes of other species (Baimai, Poopittayasataporn and Kijchalao, 1988). 36 The tips of chromosomes X, 2R and 2L can be used as diagnostic characters for the identification of species. Species B has a fanshaped tip on the X-chromosome, which is quite distinct (Hii, 1985; Baimai, Poopittayasataporn and Kijchalao, 1988).

Species A and B (Hii, 1985) The unidirectional F1 hybrid male sterility observed between the Bangkok strain identified as An. dirus by Peyton and Harrison (1979) and the Perlis form strain was the first evidence that An. dirus is a complex of two sibling species (Hii, 1985). The Bangkok strain was designated as species A and the Perlis 34 form as species B. A cross between B female and A male produced sterile hybrid males. Mitotic karyotypes of these two strains were described by Baimai, Harrison and Somchit (1981).

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