Ant communities (Hymenoptera: Formicidae) in urban centers of the Alto Tietê, São Paulo, Brazil

The Alto Tietê municipalities have rich remnants of Dense Rain Forest in their vicinities. Considering the environmental importance of the Alto Tietê as water source and that of ants as components of tropical biodiversity, this paper aimed at describing the diversity, composition and similarity of the ant fauna in urban centers of different cities. Samples were collected in houses and city squares. Seven subfamilies and 87 species were recorded, of which 39% are commonly found in the Atlantic Forest remnants adjacent to the cities. Linepithema neotropicum is dominant in areas outside the houses and in squares. In each municipality, in the area inside the houses, there is a dominant species. Tapinoma melanocephalumwas recorded preferably in the area inside the houses. Five exotic species were recorded mainly in the city of Mogi das Cruzes, SP, Brazil.

阿尔托蒂特河（Alto Tietê）流域的各周边市镇留存有大面积稠密雨林残存群落。鉴于阿尔托蒂特河地区作为水源涵养地的重要生态价值，以及蚂蚁作为热带生物多样性核心组成部分的关键意义，本研究旨在阐明不同城市中心城区蚂蚁类群的多样性、群落组成及相似性特征。本次研究的样本采集于居民住宅与城市广场内。经调查共记录到7个蚂蚁亚科与87个物种，其中39%的物种常见于毗邻城市的大西洋森林（Atlantic Forest）残存群落中。新热带立毛蚁（Linepithema neotropicum）为住宅外区域及城市广场的优势蚁类；各市区的住宅内部区域则各有其专属优势蚁种。黑头酸臭蚁（Tapinoma melanocephalum）偏好栖息于住宅内部区域。本次调查共记录到5个外来蚁种，且这些外来蚁种主要集中分布于巴西圣保罗州的莫吉达斯克鲁泽斯（Mogi das Cruzes）市。