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Folia Parasitol (Praha). 2002;49(4):314-8.

Nymphal diapause and its photoperiodic control in the tick Ixodes scapularis (Acari: Ixodidae).

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Biological Research Institute, St. Petersburg State University, Oranienbaumskoe Shosse 2, Stary Peterhof, St. Petersburg, 198504, Russia.


It is shown experimentally that the option between developmental diapause and non-diapause development in nymphs of Ixodes scapularis Say, 1821 (Middle Atlantic population) is determined by photoperiodic conditions according to a two-step photoperiodic reaction of short-day long-day type. Diapause arrest of development is induced by an impact of either long day upon unfed nymphs, or short day upon engorged nymphs, while non-diapause development completed in 2-2.5 months at 20 degrees C needs the change from short-day to long-day conditions. Some ecophysiological aspects of mechanisms controlling seasonal development of ticks belonging to Ixodes ricinus complex are discussed.

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