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REASONS FOR THE GEOGRAPHICAL DISTRIBUTION LIMIT OF THE TICK RHIPICEPHALUS SANGUINEUS LATR., 1806,
NAVAL MEDICAL RESEARCH UNIT NO 3 CAIRO (EGYPT) DEPT OF MEDICAL ZOOLOGY
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The distribution range of Rhipicephalus sanguineus was studied in Leningrad, Rostov, and Crimea Oblasts, and 13 localities of northern Caucasus. A total of 1,548 dogs were examined. Rhipicephalus sanguineus ticks were recorded only in the following regions the narrow strip of the Black Sea and Crimean littoral, Simferopol, and some areas of Staryy Krim Old Crimea. Restrictions on the distribution range of R. sanguineus, along with food and shelter conditions, are certain necessary climatic indices mean monthly temperature is the limiting factor during cold months of the year while during the hot period of the year the humidity deficit is the limiting factor where it does not exceed 40-45. Temperature fluctuations and humidity deficit may explain the appearance of temporary distribution areas. Climatic change associated with changes in nature forest-planting and canalization may sometimes assist in extending the R. sanguineus distribution range. Author
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