Research has revealed key differences in seafloor communities and habitats inside and outside the Separation Point trawl fishing exclusion zone in Tasman Bay. These have important implications for valuable benthic fisheries in the area.
What will future land use and climate change do to sediments entering southern Tauranga Harbour? To find out, Environment Bay of Plenty commissioned NIWA to model the sources and fates of sediments under various scenarios over a 50-year period.
The Motu River, in the eastern part of North Island, is the first of NZ’s so-called ‘wild and scenic rivers’. However, its upper catchment seems likely to be the focus of dairy expansion. NIWA scientists have been looking at the likely impacts of this change in land use.
Heavy metals, released by wear on tyres and brake pads, are washed off roads and can contaminate rivers, streams and harbours. NIWA has recently completed a study to measure how much copper and zinc is discharged in road runoff, and how well different stormwater devices remove these contaminants from runoff.
NIWA scientists are part of a team hoping to answer questions about how climate change might affect disease rates in New Zealand, such as those caused by pathogens like Cryptosporidium and Campylobacter, two major causes of disease in New Zealand.
Water temperature and clarity information, April to June 2010.
Our last three-monthly predictions, and what actually happened.
Monthly and seasonal river flow information, and our outlook for the coming three months.
Walking the whole length of streams is slow and difficult, but by far the best way to learn about their environmental condition.
Land-derived sediments and heavy metals are two contaminants threatening the health of New Zealand’s estuaries. NIWA has developed the Urban Stormwater Contaminant (USC) model to predict long-term sediment and heavy metal accumulation under various land-use and management scenarios. The model has recently been applied to the Waitemata and Manukau Harbours to aid planning decisions.