Mixing processes in Lake Taupō are driven largely by wind stress that can generate barotropic (surface) and baroclinic (internal) waves. During a 2002 study, a baroclinic wave in the southern basin of Lake Taupō had a setup amplitude greater than 45 m, resulting in upwelling at the southern end of the lake following strong west/southwest winds. Vessel‐mounted acoustic Doppler current profiler data showed that this setup wave w...

Lake Taupō (Taupō moana) in the central North Island is the largest freshwater lake in Aotearoa/New Zealand. Taupō is also a frequently active and potentially hazardous caldera volcano. Water quality monitoring in Lake Taupō shows possible chemical linkages between the lake and hydrothermal systems under the lake around the Horomatangi Reef. We found that hydrothermal venting, discovered in Lake Taupō in 1998, is not a steady...

To estimate a watershed’s response to climate change, it is crucial to understand how human activities and climatic extremes have interacted over time. Over the last century, the Zarivar Lake watershed, Iran, has been subjected to various anthropogenic activates, including deforestation and inappropriate land-management practices alongside the implementation of conservation measures like check dams. To understand the effects o...

Phytoplankton production as indicated by chlorophyll a concentrations in Lake Karāpiro, the last hydro power station lake on the Waikato River, shows high seasonal variability but a long term trend of decrease, despite an abundance of nutrients (N and P) in the river. Early studies pre‐2005 of the river system's eight hydro dams identified that only Lakes Ohakuri and Arapuni thermally stratified in summer, and it was hypothesi...

Factors influencing cyanobacterial blooms in Lake Horowhenua, Aotearoa/New Zealand, have been deduced from over 40 yrs routine monitoring data, detailed studies and high frequency (15‐min interval) data from an in‐lake monitoring buoy. Lake Horowhenua is currently hypertrophic but flips between a winter clear‐water, macrophyte dominated phase ( Potamogeton crispus), and a turbid phytoplankton dominated phase with substantial c...

Submarine canyons can facilitate the transfer of land‐derived organic matter to the deep sea. Here, we investigated links between variability in organic matter availability from land and marine sources and infauna communities in two contrasting canyon systems off New Zealand and used stable isotope analyses to identify potential food sources of benthic invertebrates. Kaikōura Canyon, a steep, short canyon close to the shore, w...

The release of phosphorus (P) from the sediments of eutrophic lakes is often associated with the proliferation of nuisance algal blooms, especially cyanobacteria. The successful implementation of management actions aimed at reducing such algal blooms requires an integrated approach, including both external and internal nutrient loads. The internal load of P can be a significant source of P for primary production, with greatest...

Field measurements were used to validate predictions for the initial dilution of negatively buoyant, cold‐water inflows to Lake Taupo, as part of a study to quantify mixing processes associated with the two largest inflows to the lake. The predictions were made using a formulation originally derived for positively buoyant, warm‐water inflows to cooling ponds. The formulation predicts the total dilution of an inflow during its...

Phytoplankton are recognised as the primary source of food for cultured mussels. Small phytoplankton ( a concentration as an accurate measure of phytoplankton food supply for mussels.

The influence of density stratification on sedimentation, suspension, and resuspension in Tasman Bay and Beatrix Bay, New Zealand, two contrasting coastal environments, was studied with specific reference to the implications for modelling aquaculture sustainability. Tasman Bay, an enhanced scallop (Pecten novaezelandiae Reeve) fishery, is a very large coastal indentation gently shelving to c. 20 m deep c. 10 km from shore and...