Stewart N P, Callow L L, Duncalfe F
J Parasitol. 1982 Aug;68(4):691-4.
Biological differences between two strains of Boophilus microplus were examined. The A-strain of ticks had been maintained at the laboratory for many years and the N-strain was recently isolated, being a composite strain derived from ticks from different sources in the field. In three experiments, up to three times as many N-strain ticks grew to maturity than did A-strain ticks, although A-strain ticks matured earlier. N-strain ticks were 17 to 60% heavier, and laid 50 to 100% more eggs than A-strain ticks. N-strain eggs were significantly more fertile than A-strain eggs. Unfed, N-strain larvae survived much longer than A-strain larvae. The reduced vitality of the A-strain is attributed to its long history in the laboratory during which time it has become biologically disadvantaged through inbreeding. These results suggest that some laboratory-maintained strains of ticks may be unsuitable for ecological or acaricide studies.
对微小牛蜱两个菌株之间的生物学差异进行了研究。A 菌株的蜱虫已在实验室保存多年，而 N 菌株是最近分离出来的，是一种来自野外不同来源蜱虫的复合菌株。在三项实验中，N 菌株蜱虫发育至成熟的数量比 A 菌株蜱虫多两倍之多，尽管 A 菌株蜱虫成熟得更早。N 菌株蜱虫的重量比 A 菌株蜱虫重 17%至 60%，产卵量比 A 菌株蜱虫多 50%至 100%。N 菌株的卵比 A 菌株的卵明显更具生育能力。未进食时，N 菌株幼虫的存活时间比 A 菌株幼虫长得多。A 菌株活力的降低归因于其在实验室中的悠久历史，在此期间，它因近亲繁殖而在生物学上处于劣势。这些结果表明，一些实验室保存的蜱虫菌株可能不适用于生态学或杀螨剂研究。
