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Spartina search dogs

Spartina was introduced into New River estuary in Southland during the 1940s/50s to aid reclamation work being carried out in the days before they understood how important estuaries are. Spartina rapidly spread and by the time it was realised the impact it was having on the estuary it had affected approximately 800 ha of New River and spread into four other Southland estuaries.

Large scale control of spartina in Southland was started in 1989, led by the Department of Conservation, targeting the large infestations. While the control of these large areas was achieved several years ago the ongoing challenge has been finding isolated plants within the large tidal flats that make up our estuaries. This work has been carried out by a small team of experienced staff, spending hours searching for small isolated plants in very varied conditions. With fewer and fewer plants present, improving the ability to find these plants before seeding occurred was being discussed and it was out of these discussions that the possibility of being able to train a dog to find these isolated plants was raised.

While the use of Detector dogs in New Zealand is nothing new, the use of a dog to find a weed species at very low densities is.

In October 2017 Southland Department of Conservation staff talked with John Taylor, a local dog trainer, about the possibility of training a dog to find Spartina in areas of very low density. John obtained a young collie (Wink) and in a controlled environment was able to train him to indicate on spartina plants. A field trial was undertaken in an area in New River estuary in February 2018 where DOC staff searched an area and recorded any plants found then two days later the dog searched the same area and any plants found recorded. This trial proved very successful with the dog finding all recorded plants plus two extra that staff hadn’t found. Between February and April 2018 Wink was used in conjunction with DOC staff to search for plants in several of our estuaries and continued to show the benefit of using a dog to assist in this work.

Early in 2019 a second dog (Bailey) was trained to detect spartina and started work in March 2019 being handled by a local DOC staff member. Both dogs work well together and complement each other with their different search techniques.

Three years ago, Kiwi bank became a project partner to the Conservation Dog Programme. This has enabled the Department to increase its work in both the pest detection and threatened species detection areas which includes supporting emerging new areas of work such as the Spartina programme.

The success of the dogs has seen John and Wink traveling to several different areas in the North and South Islands searching for Spartina on behalf of Regional Councils and DOC, with Bailey also spending 10 days working in the Nelson region this year.

While the use of dogs to detect spartina plants has proved very successful, the dog will not replace the small teams of very experienced staff who have spent hundreds of hours in estuaries searching for these elusive plants, but rather will work alongside these dedicated people performing a very important role.

Graeme Miller

Dog Handler

Conservation Dog Programme

Department of Conservation

Murihiku District

Carbon Calculator reduces environmental foot print

Tane’s Tree Trust has recently launched its Carbon Calculator, which helps you calculate how many native trees you need to plant to counteract your environmental foot print. You can also calculate how much CO2 your planted trees are removing or will be removing in the future. There are many examples and explanations of how this works.

Start calculating and plant some trees!

Coastal Heritage Sites at Risk

Coastal Heritage Sites at Risk

Brooke Tucker and Professor Atholl Anderson examine site stratigraphy during an excavation to salvage eroding archaeological material on Whenua Hou/Codfish Island. Photo: Johannes FischerBrooke Tucker and Professor Atholl Anderson examine site stratigraphy during an excavation to salvage eroding archaeological material on Whenua Hou/Codfish Island. Photo: Johannes FischerCoastal movement and erosion are serious issues for the preservation and management of cultural heritage in this country. Numerous archaeological sites throughout New Zealand, particularly areas of first settlement, are situated on coastlines and at estuaries and river mouths. Over the last two decades, Brooke Tucker (currently an archaeology PhD candidate at the University of Otago) has worked on many coastal sites where pre-contact Māori archaeology has been exposed and damaged by erosion.

Integrating cultural and environmental management practices in coastal landscapes can be mutually beneficial. As the archaeologist for the Whenua Hou Diving Petrel project (run by Johannes Fischer, Victoria University of Wellington), Brooke has recently been monitoring dune movement on Whenua Hou/Codfish Island where erosion threatens both the diving petrel colony and several previously recorded archaeological sites. This work identified accelerated erosion (both tidal and riverine) at a significant archaeological site on the island. In September 2019 a salvage excavation took place, revealing several layers of both pre-contact and historic occupation and dense deposits of archaeological material. Analysis of this rescued material will contribute to our understanding of New Zealand’s past.