Degradation and habitat loss of natural grasslands in Southern Brazil has a negative impact on native organisms, potentially including the composition of anuran helminth communities. Here, we characterized the richness, abundance, taxonomic composition, prevalence and intensity of helminth infection in four anuran species. Host anurans were collected in 34 ponds (19 in native grasslands with livestock and 15 in agricultural cultivation) from the highland grasslands in the Brazilian states of Santa Catarina and Paraná. Our results showed a significant difference between native grasslands with livestock and agricultural cultivation regarding the structure of helminth communities for the hosts Aplastodiscus perviridis and Pseudis cardosoi. We also found a greater prevalence and intensity of infection in anurans in areas of agricultural cultivation than in native grasslands with livestock. We found that the environmental descriptors (local and landscape) seem to explain most of the differences in anuran parasitism recorded between native grasslands with livestock and agricultural areas. Thus, we emphasized that the loss of grassy habitat due to conversion to agricultural cultivation can alter helminth communities in anurans, with further work needed to understand the mechanisms involved.

中文翻译：

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土地利用的变化影响巴西南部草原的无尾蚯蚓蠕虫

巴西南部天然草原的退化和栖息地丧失对本地生物产生负面影响，可能包括无尾目蠕虫群落的组成。在这里，我们描述了四种无尾目动物中蠕虫感染的丰富度、丰度、分类组成、流行率和强度。在巴西圣卡塔琳娜州和巴拉那州的高地草原的 34 个池塘（19 个在有牲畜的原生草原，15 个在农业种植）中收集了寄主无尾猴。我们的研究结果表明，在寄主的蠕虫群落结构方面，有牲畜的原生草原和农业种植之间存在显着差异绿质盘菌和拟黄花菜. 我们还发现，农业种植区无尾类动物的感染率和感染强度高于有牲畜的原生草原。我们发现环境描述符（本地和景观）似乎可以解释原生草原与牲畜和农业区之间记录的大部分无尾蜥寄生差异。因此，我们强调，由于转变为农业种植而导致草地栖息地的丧失可以改变无尾目中的蠕虫群落，需要进一步的工作来了解所涉及的机制。