Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search

 


Wairewa / Lake Forsyth show signs of improvement

Wairewa / Lake Forsyth show signs of improvement


Environment Canterbury monitoring has shown macrophytes (aquatic plants) have flowered in Te Roto o Wairewa (Lake Forsyth) for the first time in many years.

The species which flowered in Wairewa is Myriophyllum triphyllum which is known to have high aesthetic, wildlife, and fishery value.

Tim Davie, Environment Canterbury Surface Water Science Manager, said the growth is a sign of a stable lake environment with improving water quality.

“Macrophytes grow in lakes along the margins where their roots can reach the lake bottom, but in shallow lakes such as Wairewa they can grow almost anywhere.

“They are generally seen as an indicator of a healthy environment because they require good light penetration in the water column and a stable lake level.

“It is a positive sign they are flowering because they provide shade and habitat for fish, soak up nutrients, offer food for wildlife, and bring oxygen to the bottom of the lake which helps maintain a stable chemistry.

“The fact that macrophytes have re-established in the lake is a reflection of the active management of the lake by Wairewa Rūnanga in conjunction with Christchurch City Council and assisted by the Banks Peninsula Zone Committee.

Over the years changing sea levels, the growth of Kaitorete Spit, and changing land-use in the catchment have all contributed to alterations in the lake form.

The changes in the lake have increased the nutrient content in the sediment and water, namely nitrogen and phosphorus. This increase in nutrients along with a shallower lake has made the lake highly eutrophic, degraded the water quality, and caused algal outbreaks in summer which produce toxic bi-products.

Through the use of controlled openings and closings of the lake to the sea (at Birdlings Flat) the lake has been able to be kept at a higher, more stable level over the last three summers.

Richard Simpson, Chair of the Banks Peninsula Zone Committee, said the committee supports Wairewa Rūnanga in its aspirations for a flourishing lake ecosystem in Wairewa; the largest freshwater body on Banks Peninsula.

“The work of local Rūnanga with the Christchurch City Council has undoubtedly contributed to the improved lake environment and the re-emergence of macrophytes in the lake.

“The Banks Peninsula Zone Committee actively supports the aspirations of Wairewa Rūnanga through our Zone Implementation Programme which was developed with the community to deliver water management goals for local fresh water.

“We are also working towards developing a sub-regional chapter to set water quality limits for the lake, which will feed in to Environment Canterbury’s proposed Land and Water Regional Plan and provide the statutory framework to help deliver Wairewa Rūnanga’s aspirations for the lake.

“The committee also supports local land-owners across all of Banks Peninsula to reduce the environmental impacts of land-use on water quality and improve biodiversity values through Immediate Steps Biodiversity funding,” he said.

The Banks Peninsula Zone Committee is leading the process to work with the community to develop recommendations that include nutrient limits for freshwater in the Wairewa catchment.

The committee’s Zone Implementation Programme (ZIP) for water management aims to reduce the lake’s Trophic Level Index (TLI), and re-establish mahinga kai and contact recreation values.
Ends

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

InternetNZ On Snowden Docs: Mass Collection Of Pacific Data Affects Kiwi Holidaymakers

The allegation that New Zealand has conducted mass data harvesting on its Pacific Island neighbours raises concerns about New Zealanders’ communications being collected, says InternetNZ.

“If the allegations are correct, then New Zealand would be mining data about everyone in the Pacific Islands named in the allegations. That’s everyone. Not just individuals who attract specific surveillance warrants, but everyone. This means local residents to visiting Kiwi tourists could be having their data collected." More>>

 

PARLIAMENT TODAY:

Teina Pora Wins Appeal: Gordon Campbell On The Privy Council Decision

The quashing of the convictions of Teina Pora for the rape and murder of Susan Burdett in 1992 has shone a spotlight once again on a major gap in the New Zealand justice system... More>>

ALSO:

Urgent Bill Planned: MP Pay Rises To Match Public Service

Prime Minister John Key today announced an overhaul of the Remuneration Authority Act, tying MP salaries to those of the wider public sector, which will be passed under urgency. More>>

ALSO:

PM's Press Conference: MP Pay Rises, Solid Energy, Iraq

Prime Minister John Key answered questions in his Post-Cabinet press conference about the Iraq deployment, Solid Energy and National’s decision to overhaul the Remuneration Authority Act. More>>

ALSO:

Worksafe: MSD Charged Over Work And Income Ashburton Shooting

WorkSafe NZ has laid one charge against the Ministry of Social Development (MSD) in relation to the shooting at the MSD Ashburton office on 1 September 2014 in which two Work and Income staff were killed and another was injured. More>>

ALSO:

Iraq: Ex-Hostage Says Government Not Putting NZers, Iraqis First

Harmeet Singh Sooden is travelling to Iraq in the coming weeks to work with Christian Peacemaker Teams (CPT) on a short-term assignment. More>>

ALSO:

Joint Statement: Australia-New Zealand Leaders’ Meeting

Prime Minister Key warmly welcomed Prime Minister Abbott and Mrs Abbott to New Zealand. The visit has enabled wide-ranging and substantive discussion that has underlined the strength, value, diversity and warmth of our trans-Tasman relationship. More>>

ALSO:

Press Conference: Peters To Stand In Northland By-Election

New Zealand First Leader Winston Peters has announced his intention to stand in the Northland by-election, citing his own links to the electorate and ongoing neglect of the region by central government. More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news