Integrated Catchment Management

Coastal and Marine

Motueka delta

Motueka delta

Introduction

Productivity - and therefore the economic value - of the coastal marine environment is dependent on an adequate supply of nutrients, such as nitrogen and phosphorous, to support photosynthetic (plant) uptake and growth. Either an over or an under supply can negatively impact on the sustainability of coastal resources.

There are three major sources of plant nutrients in coastal seawaters:

The relative importance of these nutrient sources is not well understood. There are good reasons to believe, however, that the first source - terrestrial nutrients dictated by land use practices - may have important impacts on the structure and function of the coastal sea environment. Discharge of freshwater and the terrestrial materials this water carries may affect essential ecosystem dynamics (like primary production) and characteristics (like biodiversity).

To quantify the importance of these effects it is necessary to identify the nature, magnitude and spatial extent of freshwater influences on the coastal sea environment.

Coastal productivity is also dependent on an adequate supply of light for photosynthesis. Sediments discharged into the coastal environment through freshwater tributaries can effect the light availability for plant growth. In addition, when these sediments settle to the sea floor, they can play an important role in dictating the physical and chemical properties (and consequently the plant and animal communities) of the benthic environment.

Coastal productivity and, perhaps more importantly, the quality of the coastal resource can also be affected by a wide variety of contaminants discharged through freshwater tributaries. We require more information regarding the mechanisms of release of contaminants into the coastal environment and how they may impact on coastal resources.

Researchable Issues

Research Areas

Benthic diatom AGM 2006 - Russell Mincher

Benthic diatom

AGM 2006 - Russell Mincher


Publications (Selection)

Year Title File Size
2006 Fine sediment research issues in the Motueka River in the ICM programme: bringing the geomorphology and biology together How are we progressing? pdf       92KB
2003 Catchment nutrient discharges: good and bad news for the management of fish and shellfish resources in Tasman Bay.  
2002 Marine component of the Integrated Catchment Management Programme.  
2006 Nutrient discharge from the Motueka catchment into Tasman Bay, 2005. doc       24KB
2001 The Tasman Bay coastal productivity projects. doc       32KB
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Presentations (Selection)

Year Title File Size
2005 Intertidal and Subtidal Habitats of the Motueka River Delta. pdf       6.95MB
2002 Interacting factors influence the quality of water delivered to Tasman Bay from the Motueka River.  
2006 Nutrient discharge from the Motueka catchment into Tasman Bay, 2005. pdf       927KB
2008 Baker, M–A; Markham, S. Integrated catchment management policy–making in New Zealand. Presentation to NZ Association of Resource Management Annual Conference Nelson 13–15 October 2008. pdf       41KB
2006 Fine Scale Assessment and River-Sea Links in the Motueka Catchment.  
More presentations on this topic »
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Primary Contacts:


Image - Paul Gillespie Paul Gillespie  EmailSend email to paul
Phone: 03 548 2319
Fax: 03 546 9464
Institute
Cawthron Institute
Expertise
Estuarine & marine microbial ecology
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Page last updated Tuesday, 20 November 2007

Research areas

Delta habitat mapping Ecosystem models of Tasman & Golden Bays Faecal bacteria in the Motueka River Fine sediment: bringing the geomorphology and biology together Long term in–situ data collection in Tasman Bay River plume ecosystem Sediment generation, delivery and impacts Tasman Bay productivity

Research Highlight

FRST research reviews Marine modelling – how are we doing? River outwelling plumes: good or bad places to farm mussels? Tracing Sediment from the mountains to the Bay