‘Encouraging’ Blue Duck numbers in inland Hawke’s Bay
Endangered whio, or Blue Duck (Hymenolaimus malacorhynchos), continue to thrive in the mountainous rivers and streams of
inland Hawke’s Bay, according to a survey conducted by the Department of Conservation (DOC).
Three years after an initial survey prompted DOC’s Whio Recovery Group (WRG) to classify the catchment areas of the
Waiau and Te Hoe rivers as a whio ‘Recovery Site’ a second survey has validated the decision.
The census, conducted in January this year, found 18 breeding pairs along 33km of waterway bordering the Forest
Lifeforce Restoration Trust’s 6,120 hectare Maungataniwha Native Forest, compared to 19 pairs along 41km in 2011.
This equates to a density of 0.54 pairs per kilometre of river, up slightly from 0.46 pairs per kilometre three years
ago although the increase is not believed to be statistically significant.
“We surveyed some rivers this year that we didn’t look at in 2011, and vice versa,” said the study’s co-ordinator, DOC
biodiversity ranger Helen Jonas. “Some rivers we did more of this year, and some less of. So we can’t make an apples for
apples comparison.
“But the advantage of this is that we can say for sure that the encouraging outlook we discovered for whio in this part
of New Zealand in 2011 remains the same today.”
This year’s survey found 32 juveniles along the same stretches of water, up slightly from 29 in 2011. This equates to a
density of 0.96 juveniles per kilometre of river, up slightly from 0.7.
In 2011 Jonas and her team used a dog to help sniff out the ducks. This year they did not. It is possible that a dog
would have turned up more ducks than the human searchers did.
“When it comes to finding whio nothing can beat a pooch,” Jonas said.
The FLR Trust’s work with whio at Maungataniwha is funded by Genesis Energy as part of the Whio Forever project – a five
year $2.5 million dollar programme, managed by DOC, which will double the number of secure breeding sites around the
country.
The project classifies North Island sites it monitors as either Security Sites or Recovery Sites. The priority Security
Sites are whio breeding areas and there are four across the North Island. Recovery Sites receive less funding but often
have some form of stoat control, frequently funded and operated by private land owners.
At Maungataniwha whio are benefitting from the extensive predator trapping undertaken by the FLR Trust in support of its
Maungataniwha Kiwi Project, one of the most prolific and successful kiwi conservation initiatives in the country.
At 0.54 pairs per kilometre the Maungataniwha whio population density is more than double the average density of other
Recovery Sites.
Similar whio densities at the FLR Trust’s nearby Pohokura property, and duplicated in informal counts elsewhere at
Maungataniwha, indicate that relatively substantial populations are likely to exist across the southern Whirinaki and Te
Urewera ranges according to Pete Shaw, FLR trustee and Maungataniwha Native Forest estate manager.
“We’re hoping these results indicate at least a partial plateau in the decline of whio across inland Hawke’s Bay,” Shaw
said.
“To get similar numbers from two surveys, conducted three years apart, is immensely encouraging.”
The survey consisted of walking in or alongside rivers and streams, crisscrossing them and, in some cases rafting or
tubing them, to look and listen for sign such as faeces and calls. Features such as likely roost areas with protective
overhead cover were examined particularly closely.
The FLR Trust’s work with whio at Maungataniwha complements its whio secure breeding project on its
nearby property at Pohokura. In addition to these initiatives and the Maungataniwha Kiwi Project it runs a series of
native flora and fauna regeneration projects. These include a drive to increase the wild-grown
opulation of Kakabeak (Clianthus maximus), an extremely rare type of shrub, and the re-establishment of native plants
and forest on 4,000 hectares currently, or until recently, under pine.
About the Forest Lifeforce Restoration Trust The Forest Lifeforce Restoration Trust was established in 2006 to provide
direction and funding for the restoration of threatened species of fauna and flora, and to restore the ngahere mauri
(forest lifeforce) in native forests within the Central North Island.
It runs eight main regeneration and restoration projects, involving native New Zealand flora and fauna, on three
properties in the central North Island. It also owns a property in the South Island’s Fiordland National Park.
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