John W. Nagels
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View article: Differential behaviour of Escherichia coli and Campylobacter spp. in a stream draining dairy pasture
Differential behaviour of Escherichia coli and Campylobacter spp. in a stream draining dairy pasture Open
The faecal indicator bacterium Escherichia coli and thermotolerant Campylobacter spp., which are potentially pathogenic, were investigated in the Toenepi Stream draining a pastoral catchment dominated by dairying. Bacteria concentrations w…
View article: Water quality impact of a dairy cow herd crossing a stream
Water quality impact of a dairy cow herd crossing a stream Open
The water quality impact of a herd of 246 dairy cows crossing a stream ford was documented. Two cow crossings produced plumes of turbid water associated with very high concentrations of faecal indicator bacteria (Escherichia coli) and high…
View article: Ecoregional differences in macrophyte and macroinvertebrate communities between Westland and Waikato: Are all New Zealand lowland streams the same?
Ecoregional differences in macrophyte and macroinvertebrate communities between Westland and Waikato: Are all New Zealand lowland streams the same? Open
We characterised water chemistry, aquatic habitat, macrophytes, and invertebrate assemblages in eight lowland streams—five in Westland, South Island, and three in the Waikato, North Island, New Zealand. Factors influencing invertebrate com…
View article: Effects of dairying on water quality of lowland streams in Westland and Waikato
Effects of dairying on water quality of lowland streams in Westland and Waikato Open
Several New Zealand studies suggest that pastoral land use causes appreciable water quality degradation particularly in lowland streams. The water quality of eight NZ lowland streams, three near Morrinsville in the Waikato Region and five …
View article: Algal abundance, organic matter, and physico‐chemical characteristics of dairy farm facultative ponds: Implications for treatment performance
Algal abundance, organic matter, and physico‐chemical characteristics of dairy farm facultative ponds: Implications for treatment performance Open
Six Waikato (New Zealand) dairy farm facultative ponds (DFPs), which met the larger sizes specified in recent dairy industry guidelines, were sampled monthly over an annual period. Median wastewater BOD5 was 65 g m‐3, suspended solids (SS)…
View article: Water quality of a lowland stream in a New Zealand dairy farming catchment
Water quality of a lowland stream in a New Zealand dairy farming catchment Open
A small stream in a predominantly dairying catchment in the Waikato region of New Zealand was monitored for 2 years at three sites. Total nitrogen (TN) concentrations were up to 7.09 g m‐3 in winter, with the bulk comprising nitrate nitrog…
View article: Characterisation of lowland streams using a single‐station diurnal curve analysis model with continuous monitoring data for dissolved oxygen and temperature
Characterisation of lowland streams using a single‐station diurnal curve analysis model with continuous monitoring data for dissolved oxygen and temperature Open
Twenty‐three lowland streams throughout the Waikato region, New Zealand, in catchments having a wide range of land uses and intensities, were monitored continuously over 3–4‐day periods for changes in dissolved oxygen (DO) and temperature.…
View article: Water quality in a polluted lowland stream with chronically depressed dissolved oxygen: Causes and effects
Water quality in a polluted lowland stream with chronically depressed dissolved oxygen: Causes and effects Open
The Whangamaire Stream (North Island, New Zealand) has high concentrations of nitrate nitrogen (NO− 3‐N), biochemical oxygen demand (BOD5), and Kjeldahl nitrogen (TKN) as a result of catchment land use practices. The lower reaches of the s…