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首页> 外文期刊>Journal of Parasitology >Short-Term Seasonal Changes in Parasite Community Structure in Northern Leopard Froglets (Rana pipiens) Inhabiting Agricultural Wetlands
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Short-Term Seasonal Changes in Parasite Community Structure in Northern Leopard Froglets (Rana pipiens) Inhabiting Agricultural Wetlands

机译：居住在农业湿地的北豹蛙（Rana pipiens）寄生虫群落结构的短期季节性变化

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摘要

Parasite community structure can change seasonally with shifts in host habitat and in diet. However, anthropogenic activity may influence the natural changes in transmission dynamics of different parasite species. Effects of seasonal and agricultural activity on the parasite communities of newly metamorphosed northern leopard frogs (Rana pipiens) were investigated in July and September 2001 in 5 wetlands, 3 of which were exposed to pesticide runoff from surrounding agriculture. Nineteen parasite taxa were found. Component community richness was consistently high at the pristine reference wetland, whereas the communities at a managed reference wetland remained depauperate. Infracommunity richness increased throughout the season, but more so in frogs resident in agricultural wetlands. Digeneans using frogs as intermediate hosts dominated the communities, although many species were much lower in abundance in September, suggesting mortality of heavily infected frogs. Mean abundance of Haematoloechus spp. was positively related to that of odonate naiads in the frog diet, which appeared to reflect differential second intermediate host availability between reference and agricultural wetlands. Although virtually absent from wetlands in July just after frog metamorphosis, monoxenous nematodes were more prevalent and abundant at agricultural wetlands as the season progressed. Our results suggest that agricultural activity may further facilitate the transmission of monoxenous nematodes as frogs become more terrestrial.
机译：寄生虫的群落结构会随着寄主生境和饮食的变化而季节性变化。但是，人为活动可能会影响不同寄生虫物种传播动力学的自然变化。 2001年7月和2001年9月，在5个湿地中调查了季节性和农业活动对新变态的北豹蛙（Rana pipiens）的寄生虫群落的影响，其中3个湿地暴露于周围农业的农药径流中。发现了十九个寄生虫类群。原始参考湿地的成分群落丰富度一直很高，而受控参考湿地的群落仍然贫瘠。在整个季节中，地下社区的丰富度增加了，但居住在农业湿地的青蛙中的丰富度则增加了。以青蛙为中间宿主的双子座族在社区中占主导地位，尽管9月许多物种的丰度要低得多，这表明被严重感染的青蛙的死亡率很高。嗜血杆菌的平均丰度。与青蛙饮食中的卵酸盐幼虫呈正相关，这似乎反映了参考湿地和农业湿地之间第二中间寄主的可利用性。尽管在青蛙变态后的七月湿地几乎没有，但随着季节的发展，单线虫线虫在农业湿地中更加普遍和丰富。我们的结果表明，随着青蛙变得更加陆生，农业活动可能进一步促进单线虫线虫的传播。

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