Estuaries

Latest news

A group of international scientists are visiting some of New Zealand’s most significant coastal wetlands as part of a five-year research project to help the country adapt and prepare for sea-level rise.
What does science tell us about New Zealand cockles?
Aotearoa-New Zealand’s marine area covers 167,650 square kilometres presenting a staggering distribution of climates, from subtropical to subantarctic waters, to understand and manage.
Specialised monitoring equipment has been installed in Bay of Plenty estuaries to understand whether our coastal wetlands can survive the threat of inevitable sea-level rise.

Latest videos

The world's most mysterious fish

A video about The world's most mysterious fish. NIWA researchers are working with iwi to try to unlock the secrets of New Zealand tuna—freshwater eels. Every year tiny, glass eels wash in on the tide at river mouths along our coast. But where do they come from and how do they get there?

 

What does science tell us about New Zealand freshwater crayfish?
The world's most mysterious fish

A video about The world's most mysterious fish. NIWA researchers are working with iwi to try to unlock the secrets of New Zealand tuna—freshwater eels. Every year tiny, glass eels wash in on the tide at river mouths along our coast. But where do they come from and how do they get there?

 

Freshwater Update 76 brings you the latest information from our Freshwater & Estuaries Centre, with articles ranging from spring and river water condition to urban waters, didymo and aquatic plant scientists.
Excessive nutrient input (eutrophication) threatens many New Zealand estuaries causing ecological problems, such as algal blooms and poor physical and chemical conditions for estuarine life.

Compound Specific Stable Isotope tracing of sediment sources - tools to manage a sticky problem in New Zealand’s freshwaters and estuaries

Fine sediment is New Zealand’s most widespread water contaminant, degrading ecosystems, infilling dams and reservoirs and impairing recreational, cultural and aesthetic values in our rivers, estuaries and coastal seas.
In comparison to the vast span of geological time, the estuaries that we see today are very recent coastal features.
To prepare for changes in climate, our freshwater and oceans decision-makers need information on species vulnerability to climate change.

NIWA scientists have written a guide for managing mangroves, prompted by a desire for people to learn more about mangrove ecosystems, and what happens when they are removed.

As New Zealand's "Mr Eel", Niwa's Dr Don Jellyman has heard every tall tale. And some of them may be true.

A number of individuals, organisations and hapū have contributed to the development of Ngā Waihotanga Iho.

This section outlines some practical matters you need to consider before using any of the modules.

This manual aims to provide the guidance needed to manage mangrove expansion, while maintaining the ecological integrity of estuaries and harbours.

New Zealand’s mangrove swamps and coastal marshes may be particularly adept at absorbing and storing the carbon we emit.

Once you have identified the problem, and applied the necessary tools for restoring kōura to your stream, the next phase of your project is to monitor the site to see whether restoration works.
The tools available for restoring kōura to lakes and streams depend on what is causing kōura to decline.
Habitat and biological factors factors affect why kōura rare or absent in your waterway.
First, determine if kōura should be present in your stream.
Identifying the factors causing kōura numbers to decline will allow you to determine which restoration tools you need to employ.
Habitat degradation and the introduction of exotic plant and fish species have adversely affected kōura populations throughout New Zealand. However, there are a number of measures that we can use to restore kōura populations in lakes, rivers and streams.

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All staff working on this subject

Principal Technician - Marine Ecology
Principal Scientist - Ecosystem Modelling
Principal Scientist - Marine Ecology
Freshwater Fish Ecologist
Strategy Manager - Coasts & Estuaries
Principal Scientist - Marine Ecology
Principal Scientist - Marine Ecology
Coastal and Estuarine Physical Processes Scientist
Principal Scientist - Coastal and Estuarine Physical Processes
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Marine Ecology Technician
Hydrodynamics Scientist
Regional Manager - Auckland
Maori Organisational Development Manager
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