Threatened Species Protection Expansion with assistance from Bill Day of Seaworks

The Aspiring Biodiversity Trust were out in full force on Tuesday and Wednesday (11 & 12 August), determined to increase the protection of our important threatened Taonga species in preparation for the upcomming breeding season. Bill Day of Seaworks kindly offered his assistance of considerable helicopter time; thanks to Lydia Bradey, ABT’s Patron recently awarded a New Zealand Order of Merit (ONZM).

A crisp early start at Makarora; Bill Day arrives for the initial health and safety briefing before take off into the backcountry. Left to right: Andy Longman, Lydia Bradey, Bill Day (pilot) & Anthony Coote.

Invasive mammal traps fitted with kea proof fixings were assembled locally then transported to Makarora by vehicle. Here the team (Anthony Coote, Lydia Bradey, Rachel Hufton, Karen Day, Andy Longman) were met by Bill Day (Director of Seaworks keen to contribute to indigenous biodiversity protection) in his B0105 helicopter, equiped with plenty of space for transporting predator traps into the backcountry.

The endangered alpine rock wren (juvenile) or pīwauwau, Crucible Basin.

Traps were droped at a number of locations including the upper Siberia, Crucible Basin,  upper/lower  Lucidus and Wilkin Valley. The locations are of particular importance for remnant populations of the alpine rock wren, the ancient blue duck (whio) and kea (as indentified by ABT surveys and monitoring) and will intensify current predator control regimes.

Trap drop at lower Lucidus – where the habitat of rock wren overlaps with blue duck/ whio territories.

Existing traps identified as triggered from Encounter Solution’s remote monitoring Celium technology were serviced.  The new traps will be fitted with detection nodes extending the alpine remote monitoring network. Stoats are currently active within the alpine environment (where rock wren are likely to be particuarly vulnerable in their current state of torpor durung the winter) and down to the river valley (where blue duck frequent whilst foraging for aquatic invertebrates or grazing from algae clad boulders).

Adult blue duck or whio within the upper Siberia Valley (Credit: Nick Beckwith)

The stoat Mustela erminea is a small mammalian carnivore native to Eurasia and North America. The Wilkin was one of the first New Zealand introduction sites back in 1885’s in an attempt to control rabbits. Usually the fur is chestnut brown with a white underbelly; the tail has a black tip and is the most distinguishing feature of this mustelid. Some stoats undergo a white moult during the winter in alpine New Zealand, the tail tip remains black as shown in the example below from our last trip.

An upper Wilkin alpine stoat (a varacious predator of indigeonous wildlife) displaying its pale coat aiding camouflage during the winter months. Note: animal captured humanely with DOC 200 trap.

Lydia Bradey and Bill Day discussing the importance of the work Aspiring Biodiversity Trust have been doing to date and taking a moment to appreciate their incredible homeland in what was optimal weather conditions. 🙂

Lydia Bradey and Bill Day expressing the importance of indigenous biodiversity protection and restoration (Upper Wilkin Valley), fundamental to New Zealand’s cultural heritage.

Aspiring Biodiversity Trust actively contributing to the goals of Predator Free 2050 and working towards local and national Biodiversity Strategys through collaborative engagement.

Acknowledgements

With thanks to all our funders, volunteers and incredible supporters particuarly Perry Brooks and Rich Raynes for predator trap assembly, the Department Of Conservation (DOC) for validation of landing sites and Backcountry Helicopters for remainder of team pickup on Wednesday.

Spring in the Makarora Catchment – From Ridge to River

Coffee break at Jumboland airstrip (the Coru Lounge)

With this seasons work programme in full swing, spring 2019 marks the installation of ABT’s upper river predator control for whio or blue duck (Hymenolaimus malacorhynchos) protection within the Siberia Valley and the Wilkin Valley. This follows previous walkover survey work with the aid of a protected species dog specifically trained in the detection of whio; New Zealand’s ancient waterfowl species, an important part of Makarora’s indigenous taonga.

A whio pair (also known as blue duck) recorded within the Wilkin Valley Feb 2019

Here remnant populations of whio still remain however numbers are low and fledgling survival is limited by the presence of invasive predators such as stoat and rat. This can often lead to a sex ratio imbalance as females tend to be more vulnerable when nesting and during moult. The new trapping networks join up with alpine trap lines to help extend invasive predator coverage for this globally endangered species.

Predator control traps delivered by Backcountry Helicopters into mid-Siberia Valley. Photo credit Pilot Blair

Spring is also the time to resume alpine predator control operations for rock wren and kea protection. New traps added and a number of stoats, and rodents had been caught over the winter months despite not all traps being accessible at higher levels due to the amount of snow still present (these traps will be serviced next visit).

Invasive mammal trap exposed from the snow at Upper Lucidus (September 2019).
A mummified stoat caught at altitude during the winter months

Rock wren pairs were active at the Crucible Basin but all was quite in the upper Wilkin Valley (where snow cover heavier) suggesting that this population may not of yet stired from their winter torpor. Kea were heard calling above the Siberia Valley  and one in the upper Wilkin.

Crucible Basin trap drop off with Backcountry Helicopters and logistical planning for the day ahead
Snow cover along the ridge of Lake Crucible looking towards Gillespie Saddle (Oct 2019). The characteristic call of the rock wren is often heard here.

Back in the lower river valleys of the Makarora and Wilkin, braided river birds have returned and are starting to nest again. ABT braided river invasive mammal predator control continues on a monthly basis throughout the year with the help of regular volunteers. Stoats, rats, hedgehogs and feral cats are being reduced to help improve fledgling success of endangered birds such as black-fronted tern, wrybill and black-billed gull. The Southern black-backed gull is a avian predator of endangered braided river birds and their chicks. Adaptive management of this species is due to progress this season also.

Makarora braided river habitat showing the Wilkin confluence and the head of Lake Wanaka

Acknowledgements

With thanks to all our volunteers, funders, partners and supporters 🙂