The purposes of the two-year plan are to integrate ecological information and current status on the ZengWun River System in order to provide a basis of ecological engineering planning and an establishment of ecological resources database. In addition to the compilation of abiotic factors (physical conditions, water quality indices, engineering constructions, and recreation usages), we conducted seasonal biological surveys on algae, aquatic insects, shrimps, crabs and freshwater fishes in aquatic ecosystem , and on riparian vegetations, mammals, birds, reptiles, amphibians, and butterflies in terrestrial ecosystem.
The contents of the river situation investigation include： (a) the
river physical survey (including the river essentials, watershed
essentials, flow and water quality, river type...etc.)；(b) the
biological survey (including fish, shrimps, crabs, spiral shells,
shells, aquatic insects, algae, birds, mammals, reptiles,
amphibians, butterfly, dragonfly, plant, etc.)；(c) the river usage
condition (including riparian land utilization condition, river
usage condition...etc.) ； (d) the ecosystem resources data base
In the terrestrial ecosystem, there are 17 orders, 53 families, and
163 species of birds； 7 orders, 14 families, and 30 species of
mammals； 2 orders, 10 families, and 30 species of reptiles； 5
families, and 23 species of amphibians； 8 families, and 87 species
of butterflies； 7 families, and 19 species of dragonflies. The birds
amount to 6 first–rate preservation species, 24 second–rate
preservation species, 14 third– rate preservation species, 8 endemic
species, and 46 endemic subspecies. The mammals amount to 4 endemic
species, 13 endemic subspecies, and 4 second–rate preservation
species. The reptiles amount to 4 endemic species, and 10
second–rate preservation species. The frogs amount to 5 endemic
species, and 7 second–rate preservation species.
human development, water survey, pollution index and biological resources. A web-based query system was also established and installed. Users may access the maps from remote computers.
Our work on the current status in the ZengWun River System is only a
beginning for effective management of the natural resources in the
region. We expect similar work can be conducted in other rivers of
Taiwan in the near future, and these data can be compiled in a
well-designed database. These status reviews should provide a
starting point for our river management work and, thus, a better
environment for future generations.