canals and ornamental ponds. Many of these habitats were vegetated and the associated vegetation included many types of 水生植物单子叶植物(e.g. "纸莎草", "藨草属" sp., "香蒲属" sp., "芦苇属" sp.) and 双子叶植物 (e.g. "金鱼藻", "菹草", "延药睡莲"). Where densities are high, "Tarebia granif