ABSTRACT

The Brazilian Pampa is predominantly composed of native grasslands with riparian forest formations. It preserves a rich biodiversity and provides vast biological resources for economic uses. The objectives of this study were to compare the mite fauna composition on plants in three environments i.e. grassland, grazing exclusions, and riparian forest; to relate mites with microclimatic factors, and to evaluate interactions between mites and vascular plants. Data analysis was based mainly on the relationship between mite and plant species. A total of 117 mite species were collected, most of which were phytophagous (57%). Our studies revealed that mite communities from riparian forest differ from grazing exclusions and grasslands. Grassland and grazing exclusions were dominated by two species i.e. Brevipalpus sp2 and Tydeus californicus (Banks). In the riparian forest, the most abundant species was Lorryia formosa (Cooreman). In conclusion, mites represent environmental indicators of microclimatic factors and landscape. All the sampling sites had high interaction between mites and plants.

摘要

巴西潘帕草原主要由原生草原和河岸森林构成。它保护了丰富的生物多样性，并为经济用途提供了大量的生物资源。本研究的目的是比较三种环境中植物的螨类动物群组成，即草地、放牧区和河岸森林；将螨与小气候因素联系起来，并评估螨与维管植物之间的相互作用。数据分析主要基于螨与植物物种之间的关系。共收集到 117 种螨类，其中大部分是植食性的（57%）。我们的研究表明，河岸森林的螨群与放牧区和草原不同。草地和放牧区由两个物种主导，即Brevipalpussp2 和Tydeus californicus（银行）。在河岸森林中，最丰富的物种是Lorryia formosa (Cooreman)。总之，螨虫代表了小气候因素和景观的环境指标。所有采样点都具有较高的螨类与植物的相互作用。