New River Estuary 2007 : broad scale habitat mapping and sedimentation rate /

Robertson, Barry

New River Estuary 2007 : broad scale habitat mapping and sedimentation rate / Barry Robertson and Leigh Stevens. - [Invercargill, N.Z.] : Environment Southland, 2007. - vi, 34 p. : ill., maps ; 30 cm.

"November 2007".

Includes bibliographical references (p. 31).

To assess the major issues faced by New Zealand estuaries (Table 1), Environment Southland (ES) established a long-term monitoring programme in the 1990gass based on the tools included in the National Estuary Monitoring Protocol (EMP) (Robertson et al. 2002). The EMP consists of two main elements: b0s Broad scale habitat mapping (using Geographic Information System (GIS) computer software). b0s Fine scale (i.e. detailed) monitoring of dominant intertidal habitat in the mid estuary area. Broad scale habitat mapping records the location and type of vegetation (e.g. saltmarsh, seagrass, macroalgae) and substrate (e.g. mud, sand, gravel); and is used to provide information primarily on the issues of habitat and margin loss, sedimentation (through the mapping of substrate type), and eutrophication (by mapping macroalgae percent cover). Fine scale monitoring focuses primarily on the physical, chemical, and biological characteristics of estuary sediments as these tend to be the most sensitive to degradation (Church 1975). Fine scale monitoring includes various indicators of estuary condition to provide information on sedimentation, eutrophication, and toxins (i.e. sediment particle size, organic matter, nutrients, heavy metals, and sediment macrofauna). In 2006, ES contracted Wriggle Coastal Management (Wriggle) to review the EMP monitoring undertaken by ES between 2001 and 2006, and to provide an overview gbsState of the Environmentgcs assessment of the condition of Southlandgass estuaries (Robertson & Stevens 2006). The report expanded the reporting of EMP monitoring data by developing key condition indicators (summarised in Table 2) and proposing interim condition ratings to evaluate estuary condition. A suggested monitoring or management response was linked to each condition rating, while recommendations were made to address any identified gaps in the existing monitoring programme.


ESTUARIES
WAIMATUKU ESTUARY
SUBSTRATES
MACROALGAE
MACROPHYTES
AQUATIC PLANTS
SEAGRASSES
SALT MARSHES
SEDIMENTATION
EUTROPHICATION
HABITATS
MAPPING
SOUTHLAND
NEW ZEALAND

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