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

Gordon Campbell:
On Anne Tolley’s
Callous Folly

Years ago, I remember someone in the Heath Ministry telling me off the record that regulatory oversight in this country largely consisted in ‘waiting for something to turn green or fall off somebody’ before the authorities would swing into action...

Last week’s conflict between Social Development Minister Anne Tolley and District Court judge Carolyn Henwood illustrated quite a few of the flaws in the system. More>>

 

Members’ Bills: Greens' Domestic Violence And Loans Bills Pulled From Ballot

Jan Logie’s Domestic Violence-Victims' Protection Bill introduces workplace protections for victims of domestic violence, including allowing victims to request paid domestic violence leave for up to 10 days... Gareth Hughes’ Bill allows Kiwis with student loans to defer their student loan repayments into a first home savings scheme. More>>

ALSO:

IPCA: Police Did Not 'Deliberately' Use Pepper Spray On 10-Year-Old

"When spraying the man, the officer did not properly consider the necessity of using pepper spray in a confined space, the likelihood that it would affect the other innocent passengers or the fact that he was using a more powerful spray." More>>

ALSO:

Donor Bill Passes: Full Income Compensation For Live Organ Donors

Unanimous cross-party support for the Compensation for Live Organ Donors Bill represents a critical step in reducing the burgeoning waiting list for kidney donations, according to Kidney Health New Zealand chief executive Max Reid. More>>

ALSO:

Earthquake Response: Emergency Legislation Prepared

Three new Bills have been drafted in the wake of the magnitude 7.8 earthquake on November 14 to ensure the government can enable affected communities to respond quickly and efficiently. More>>

ALSO:

Housing MPs: New Building(s) For Parliament

A new building will be erected on Parliament grounds to house Members of Parliament and their staff who currently work in leased accommodation in Bowen House. The plan has cross-Party support, apart from NZ First, said Parliament’s Speaker, Rt Hon David Carter. More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news