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

Budget '17: Budget Spends Down Future Surpluses

Tax cuts for every working New Zealander, targeted to low and middle income earners, more generous assistance for families and renters, and a massive spend-up on public services infrastructure mark Finance Minister Steven Joyce’s election year Budget.

The package of changes to income tax thresholds, the Working for Families programme, and the Accommodation Supplement is the Budget’s political centrepiece and will cost $2 billion a year. More>>

Scoop Full Coverage: of Budget Announcements & Reaction
Latest: Scoop Search

ALSO:

 
 

Auditor-General Stands Down For Investigation: Gordon Campbell On (Not) Taking Responsibility

So Martin Matthews, our current Auditor-General wishes he could have detected “earlier” the fraud that occurred on his watch at the Ministry of Transport. Hmmm. But he could have detected it earlier, surely? That’s the point. More>>

ALSO:

NGOs Pleased: Govt To Halt Collection Of Client Data

Brenda Pilott, the chair of ComVoices and national manager of Social Service Providers Aotearoa, congratulates the government on its decision to call a halt to the collection of individual client data until the concerns of not-for-profit service providers have been worked through. More>>

ALSO:

Gosh: Blasphemy Law Repeal Struck Down

Chris Hipkins, the MP who tabled a Supplementary Order Paper to add our Blasphemy Law to the Statutes Repeal Bill, said this was a "sad day for freedom of speech, tolerance, and leadership". More>>

ALSO:

Gordon Campbell: On The Navy’s Dealings With Fat Leonard, And Twin Peaks

At an official level, our “she’ll be right” attitude routinely spills over into a keen resentment of anyone who suggests the outcomes may be less than satisfactory… The Navy has now gone one step beyond. It won’t even ask itself whether it did a good job. More>>

ALSO:

NZDF: Fifth Rotation Of Troops Heads To Iraq

The fifth rotation of New Zealand Defence Force troops left today for a six-month mission training Iraqi soldiers. More>>

ALSO:

Gordon Campbell: On The Demonising Of Iran

Will New Zealand still be willing to pursue its recent trade overtures to Iran, now that US President Donald Trump has used his speech in Riyadh to single out Iran as the main source of terrorism and instability in the Middle East? More>>

ALSO:

 
 
 
 

Opening The Election Supporters

 

LATEST HEADLINES

  • PARLIAMENT
  • POLITICS
  • REGIONAL
 
 

Featured InfoPages

Opening the Election