COMPARATIVE ECOLOGY OF HAEMAPHYSALIS JAPONICA NUTT. ET WARB. AND IXODES ANGUSTUS NEUM IN FAR EAST CONDITIONS,
NAVAL MEDICAL RESEARCH UNIT NO 3 CAIRO (EGYPT) DEPT OF MEDICAL ZOOLOGY
Pagination or Media Count:
Among relict animal species of the Far East, 2 ixodid tick species, Ixodes angustus and Haemaphysalis japonica douglasi are scientifically interesting. The latter species is also a vector of tickborne encephalitis virus. I. angustus is a common and widespread species in Central Priamurye and Primorye. Its ecology is closely associated with the biological features of shrews. This tick is not associated with mammal and bird burrows but is a pasture species. From the infestation character of animals by different ages and sexes of the tick it is evident that the most infested animals are roaming rodents and shrews after emerging from their nests and during the first period of a nomad type of life. The distribution area of H. japonica douglasi coincides with the boundary of the conifer-broadleaf forest zone. The period of active larval and nymphal parasitism last from 10-15 April to October, while that of adults is from the appearance of first spring thaw patches to August. This species belongs to pasture parasites and is not encountered in mammal nests or in bird-inhabited tree holes. Adult stage hosts are large mammals on which the tick males overwinter. The ticks usually overwinter in nature in all developmental stages. Murine rodents and shrews do not serve as the hosts of this species. This tick is very numerous on birds.