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首页> 外文期刊>Parasitology >Population genetic structure of the prairie dog flea and plague vector, Oropsylla hirsuta.
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Population genetic structure of the prairie dog flea and plague vector, Oropsylla hirsuta.

机译：草原犬鼠蚤和鼠疫载体Oropsylla hirsuta的种群遗传结构。

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摘要

Oropsylla hirsuta is the primary flea of the black-tailed prairie dog and is a vector of the plague bacterium, Yersinia pestis. We examined the population genetic structure of O. hirsuta fleas collected from 11 prairie dog colonies, 7 of which had experienced a plague-associated die-off in 1994. In a sample of 332 O. hirsuta collected from 226 host individuals, we detected 24 unique haplotype sequences in a 480 nucleotide segment of the cytochrome oxidase II gene. We found significant overall population structure but we did not detect a signal of isolation by distance, suggesting that O. hirsuta may be able to disperse relatively quickly at the scale of this study. All 7 colonies that were recently decimated by plague showed signs of recent population expansion, whereas 3 of the 4 plague-negative colonies showed haplotype patterns consistent with stable populations. These results suggest that O. hirsuta populations are affected by plague-induced prairie dog die-offs and that flea dispersal among prairie dog colonies may not be dependent exclusively on dispersal of prairie dogs. Re-colonization following plague events from plague-free refugia may allow for rapid flea population expansion following plague epizootics.
机译：Oropsylla hirsuta是黑尾土拨鼠的主要跳蚤，是鼠疫细菌耶尔森氏菌的载体。我们检查了从11个草原犬鼠种群中收集的hirsuta跳蚤的种群遗传结构，其中有7个在1994年经历了鼠疫相关的死亡。在从226个宿主个体中收集的332 hirsuta跳蚤的样本中，我们检测到24个细胞色素氧化酶II基因的480个核苷酸区段具有独特的单倍型序列。我们发现总体种群结构显着，但未检测到距离隔离信号，这表明hirsuta O.能够在本研究范围内相对较快地分散。最近被鼠疫灭绝的所有7个菌落均显示出近期种群扩张的迹象，而在4个鼠疫阴性菌落中，有3个显示出与稳定种群一致的单倍型。这些结果表明，hirsuta种群受鼠疫诱发的草原犬鼠死亡的影响，而在草原犬鼠种群之间的跳蚤散布可能并不完全取决于草原犬鼠的散布。来自无瘟疫避难所的鼠疫事件后的重新定殖可能使鼠疫流行后的跳蚤种群迅速扩大。

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