Feeding Performance, Survival and Appearance of Dermacentor Variabilis Nymphs (Acari: Ixodidae), as Influenced by Host Resistance

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Abstract
The research to date dealing with the phenomena of tick feeding and host resistance has been primarily concerned with the biochemical and physiological transformations which occur in the host (Allen, 1973, Int.J. Parasitol. 3: 195–200; Boese, 1974, J. Med. Entomol. 11: 503–12; Rick, 1962, Aust. J. Agric. Res. 13: 532–50; Trager, 1939, J. Parasitol. 25: 57–81). I know of no published studies on the various transformations (e.g., extended feeding time, decrease in the number of ticks successfully engorging and decrease in the engorgement size) manifested by the ticks during the development of host resistance. Such information is not only interesting but would be a great aid to those investigators who must project the yield of ticks, whether for control or rearing purposes, from a sensitized host. It was the object of this study, therefore, to report on these specific aspects as they occurred in the nymphs of Dermacentor variabilis.

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