Stephen J. Swales

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Biological monitoring of the Fly River system in Papua New Guinea has shown that floodplain habitats (oxbow lakes, blocked valley lakes and seasonally inundated grassed floodplain) support diverse and abundant populations of freshwater fishes. Since monitoring first commenced in the early 1980's, a total of 66 fish species representing 33 families has been(More)
The brown trout in Llyn Frongoch, a mature upland reservoir, and its nursery stream was sampled during 1983. The stream stock consisted largely of the 1983 and 1982 year classes, with fish reaching mean lengths of 7.0 and 11.6 cm at one and two years of age. The size and biomass of the stream stock at the beginning of 1983 and 1984 were estimated to be 120(More)
Monitoring of the impacts of the Ok Tedi copper mine on fish populations in the Fly River system in Papua New Guinea has recorded approx. 100 species of fish representing 32 families. Fish catches have shown considerable temporal and spatial variability but, since the commencement of mine operations and the input of mine-derived waste material into the(More)
For most of the last decade, the south-western portion of the United States has experienced a severe and enduring drought. This has caused serious concerns about water supply and management in the region. In this research, 30 orthorectified Landsat satellite images from the United States Geological Service (USGS) Earth Explorer archive were analyzed for the(More)
The Laurentian Great Lakes of North America contain approximately 20% of the earth’s fresh water. Smaller lakes, rivers and channels connect the lakes to the St. Lawrence Seaway, creating an interconnected freshwater and marine ecosystem. The largest delta system in the Great Lakes is located in the northeastern portion of Lake St. Clair. This article(More)
Biological monitoring of fishes in the Fly River system in Papua New Guinea has been carried out in relation to the input into the system of mine wastes from the Ok Tedi copper mine. A total of 86 fish species representing 32 families has been recorded from sites in the main river channel since the commencement of monitoring operations in 1983. Catfish in(More)
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