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Forest fragmentation predicts local scale heterogeneity of Lyme disease risk

机译:森林碎片化预测莱姆病风险的局部范围异质性

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Fragmentation of the landscape has been proposed to play an important role in defining local scale heterogeneity in Lyme disease risk through influence on mammalian host density and species composition. We tested this observed relationship in a suburban region around Lyme, Connecticut, where we collected data on the density of the tick vector, Ixodes scapularis and prevalence of the Lyme bacterium, Borrelia burgdorferi at 30 sites. Analysis of the landscape pattern of forest patches was performed using satellite imagery. The calculated landscape indices, which included patch size and isolation, revealed a positive link between fragmentation and both tick density and infection prevalence in ticks. In spite of higher entomologic risk, human incidence of Lyme disease is lower in fragmented contexts suggesting that entomologic risk is not the critical driver of human infections. These results represent a departure from the prior claims that fragmentation and human Lyme disease risk are positively linked. A complete understanding of the influence of landscape fragmentation will allow for improved risk mapping and potential environmental management of Lyme disease.
机译:已经提出景观的破碎通过影响哺乳动物宿主密度和物种组成,在定义莱姆病风险中的局部尺度异质性中起重要作用。我们在康涅狄格州莱姆市附近的郊区测试了这种观察到的关系,在该地区我们收集了关于the虫媒介,肩x小食虫的密度和莱姆细菌伯氏疏螺旋体的流行率的数据,分布在30个地点。使用卫星图像对森林斑块的景观格局进行了分析。计算得出的景观指数(包括斑块大小和隔离度)揭示了碎片与tick密度和s感染率之间存在正相关关系。尽管存在较高的昆虫学风险,但在零散的情况下,人类莱姆病的发病率较低,这表明昆虫学风险并不是人类感染的关键驱动因素。这些结果与先前的观点不同,即碎片和人类莱姆病风险呈正相关。全面了解景观破碎化的影响将有助于改善风险图和莱姆病的潜在环境管理。

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