Comiskey N M, Lowrie R C, Wesson D M
Department of Tropical Medicine and Parasitology, School of Public Health & Tropical Medicine, University of Tulane, New Orleans, LA 70112, USA.
J Med Entomol. 1999 May;36(3):313-20. doi: 10.1093/jmedent/36.3.313.
Monthly sampling of tire pile populations of Aedes albopictus (Skuse) in Orleans Parish, New Orleans, LA, was done in 1995 to determine prevalence of ascogregarine parasites and changes in wing length. Prevalence of Ascogregarina taiwanensis (Lien & Levine) infection was 100% in midsummer and decreased in the fall and spring (60-70%). Wing lengths were longest in the spring and fall and shortest in midsummer. We evaluated the effect of A. taiwanensis infections under high and deficient levels of leaf litter nutrients on mortality, development time, wing length, and reproductive potential of a New Orleans strain of Ae. albopictus. Parasitism and deficient nutrients caused a 35% increase in the rate of larval mortality and significantly extended the development time of females. Parasitized adults were 5% smaller and produced 23% fewer eggs than unparasitized siblings. In addition, abnormal Malpighian tubule morphology and melanization of ascogregarines were seen in adults from nutrient-deficient microcosms. We conclude that ascogregarine infections affect the dynamics of Ae. albopictus by increasing the mortality of immature stages when nutrients supplies are scarce, and by decreasing the reproductive capacity of females under high nutrient conditions.
1995年，在路易斯安那州新奥尔良市奥尔良教区对白纹伊蚊（Skuse）的轮胎堆种群进行了月度采样，以确定阿斯科格雷加林寄生虫的流行情况以及翅长的变化。台湾阿斯科格雷加林（Lien & Levine）感染率在仲夏时为100%，在秋季和春季有所下降（60 - 70%）。翅长在春季和秋季最长，在仲夏最短。我们评估了在高叶凋落物养分水平和低叶凋落物养分水平下，台湾阿斯科格雷加林感染对新奥尔良白纹伊蚊品系的死亡率、发育时间、翅长和繁殖潜力的影响。寄生和养分不足导致幼虫死亡率增加35%，并显著延长了雌蚊的发育时间。被寄生的成虫比未被寄生的同胞成虫体型小5%，产卵量少23%。此外，在养分缺乏的微生境中的成虫中观察到马尔皮基氏小管形态异常和阿斯科格雷加林黑化。我们得出结论，阿斯科格雷加林感染通过在养分供应稀缺时增加未成熟阶段的死亡率，以及在高养分条件下降低雌蚊的繁殖能力，影响白纹伊蚊的动态。
