Monday, 6 November 2017

New methods paper - Census survey approach for īnanga spawning habitat

Waterways and MERG have recently published details of a survey methodology for locating and mapping īnanga spawning sites near coastal rivermouths. 

The paper in NZ Journal of Marine and Freshwater Research is available online here.

There's a two page summary available here


Wednesday, 1 November 2017

Evaluation of Christchurch City Council's riparian management trial

Christchurch City Council (CCC) recently changed its riparian vegetation clearance practices for a trial period in the summer of 2016/17. While the trial has wider objectives around improved environmental outcomes, īnanga spawning habitat is directly affected by bank cutting and other forms of vegetation clearance. A survey of īnanga (Galaxias maculatus) spawning habitat was completed in April 2017 to evaluate effects of the trial.

Benefits of the trial included increasing the availability of high quality spawning habitat and the discovery of new spawning sites. The Avon/Ōtākaro supported a relatively high area of occupation (AOO) of spawning sites for a single month in comparison to other years. In the Heathcote/Ōpāwaho spawning was found at new sites including upstream of Opawa Road. However, egg production was relatively low in the Heathcote/Ōpāwaho versus the same month in previous years. This suggests a shift in the month of peak spawning activity or a possible adult population decline and requires consecutive month surveys to confirm the actual trend.

The full report is available on the CCC website here:
Response of īnanga spawning habitat to riparian vegetation management

Monday, 19 June 2017

Floodplain planning - a case study on regeneration oppportunities in a post-disaster setting

We're pleased to announce the findings of a three-part study on ecological 'regeneration' opportunities for the red-zoned lands in Avon / Ōtākaro river corridor. The study was supported by Avon-Ōtākaro Network in collaboration with Avon-Ōtākaro Forest Park and Greening the Red Zone.


This study provides an analysis of planning considerations for the floodplain (including sea level rise), opportunities for ecological restoration, and methodologies for incorporating these in the design of assessment to compare different land use options - as are needed to support decisions on these lands.

Monday, 12 June 2017

NZ's largest known area of inanga spawning found in Christchurch waterways!

An unexpected result of our earthquake studies was the discovery that  īnanga spawning habitat had expanded, and was more extensive than ever previously recorded in Christchurch's waterways.

Further surveys in 2016 found that even larger areas were being used. The total area of spawning was around 2x
the next largest area recorded anywhere in New Zealand !

Read more >>

Monday, 5 June 2017

New spawning sites found in Aromahana Lagoon in Greymouth

Dr. Mike Hickford and I recently visited an community restoration project on Cobden Island in the Grey River and nearby Aromahana Lagoon. Our main goal was to scope out a survey strategy for monitoring īnanga spawning in this area. Time was short but we did manage to find two new spawning sites. 

This is an innovative floodplain restoration project on an impressive scale. Thanks to Henk Stengs at DOC for showing us around!

Read more >>




Tuesday, 3 January 2017

New Zealand Coastal Society award

Thanks to the New Zealand Coastal Society for the Best Overall Presentation prize at the 2016 New Zealand Coastal Society conference He Waka Eke Noa: Linking Science, Engineering, Management and Community. I was completely taken by surprise given the many excellent speakers!

The conference is held each year and attracts diverse attendance from scientists, engineers, and planners, with presentation covering a wide range of contemporary management topics.

Read more >>

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