Understanding the distribution of parasites is crucial for biodiversity conservation. Here, we studied the distribution of the ectoparasitic fungus Laboulbenia formicarum in native and invasive Lasius ants in a 2000 km² area. We screened over 16,000 ant workers in 478 colonies of five different species. We found that Lab. formicarum was rare in native Lasius species but infected 58% of the colonies of the invasive species Las. neglectus. At landscape scale, Lab. formicarum presence could not be explained by geographic and genetic distances between Las. neglectus colonies but was associated with hotter and dryer climatic conditions and its prevalence in colonies increased with urbanization. Within infected colonies, fungal prevalence varied from 0 to 100 percent within meters and was negatively correlated with impervious ground cover. In a changing world, our findings emphasize the importance of land-use and climatic factors in shaping the distribution and prevalence of fungal parasites.

了解寄生虫的分布对于保护生物多样性至关重要。在这里，我们研究了2000 km ²区域内原生和侵入性Lasius蚂蚁中的外寄生真菌Laboulbenia formicarum的分布。我们在五个不同物种的478个殖民地中筛选了16,000多名蚂蚁工人。我们找到了那个实验室。甲虫在本地Lasius物种中很少见，但感染了Las入侵物种58％的菌落。被忽视。在景观尺度上，实验室。不能通过Las之间的地理和遗传距离来解释是否存在胶木。疏忽殖民地，但与更干燥的气候条件有关，随着城市化，其在殖民地的患病率增加。在被感染的菌落内，真菌的流行率在0米至100％的范围内变化，并且与不透水的地面覆盖率呈负相关。在不断变化的世界中，我们的发现强调了土地利用和气候因素在塑造真菌寄生虫的分布和流行方面的重要性。