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A gift of lizards – 35 years to completion

The New Zealand science community was quite different in 1977 compared to 2012. Most government scientists then worked for one of the many divisions of the Department of Scientific and Industrial Research (DSIR), our reserve networks and protected species were administered by multiple agencies, and the national museum was known as …the National Museum.

All this was to change during the 1980s and early 1990s – Rogernomics and the 1987 stock market crash between them changed the face of New Zealand public science forever.  By 1992, DSIR had been split into a plethora of Crown Research Institutes (CRIs), the Department of Conservation had been formed, and the Museum of New Zealand Te Papa Tongarewa Act had been passed.

Pacific gecko (Dactylocnemis pacificus), Taranga / Hen Island. There were two Pacific geckos from Taranga in the Ecology Division reptile collection. Photo: Colin Miskelly, Te Papa.

Among the agencies swept by the tides of change was the Ecology Division of DSIR, which evolved into Landcare Research Manaaki Whenua. In 1966, Ecology Division employed a keen young lizard enthusiast as a research technician (and later scientist). Over the next 11 years, Tony Whitaker made the most of opportunities to get to remote parts of the country. This included a secondment to a Wildlife Service team undertaking field surveys of many of New Zealand’s northern islands. In an era when our lizards were poorly known (and not protected by the subsequent changes to the Wildlife Act), Tony was largely responsible of the creation of New Zealand’s most important collection of lizard voucher specimens.

Ornate skink (Oligosoma ornatum), Taranga / Hen Island. There were two ornate skinks from Taranga in the Ecology Division reptile collection. Photo: Colin Miskelly, Te Papa.

We still don’t know how many lizard species were in the Ecology Division reptile collection. New species of skinks and geckos are being described every year, and many of these new species are represented among the 2635 New Zealand lizard specimens in the Ecology Division collection.

Tony Whitaker resigned from Ecology Division in 1977. Under his care, the reptile and frog collection had grown to 2751 specimens, including 105 foreign specimens, and 2646 from New Zealand. The latter included 1516 skinks, 1119 geckos and 11 frogs. Before he left, Tony and his colleagues decided that the collection would best be placed in the care of the National Museum.

The Ecology Division (ED) collection was the single largest contribution to Te Papa’s impressive and still growing herpetofauna collection, which now contains nearly 9000 New Zealand specimens. Among the ED treasures are six skink holotypes – the unique specimens that were used by scientists when describing and naming these six species.

Te Papa’s reptile and frog collection is mainly comprised of specimens preserved in ethanol, housed in the purpose-built off-site Spirit Collection Area. Photo: Colin Miskelly, Te Papa.

But all was not as assumed. Most people involved in the 1977 transaction recalled it as a donation. However, a letter from the then Director of the National Museum to his Ecology Division equivalent unearthed in Te Papa’s archives painted a different picture: Dick Dell thanked John Gibb for the “semi-permanent loan” of the specimens.

This discovery created a dilemma for Te Papa staff.  We endeavor to place as many of our taonga as possible on the Te Papa website (see Collections Online). But we must be careful that we are within our rights to do so. Recognition that the ED reptile and frog specimens were loaned rather than donated meant that we had to remove their images from our website.

To resolve this impasse, I wrote to the CEO of Landcare Research, Dr Richard Gordon. After an exchange of letters, emails, and now a deed of gift, I am delighted to announce that Landcare Research has completed the process of gifting this very important collection to Te Papa. And images of the holotypes (among other ED treasures) are back on our website.

Whitaker’s skink (Oligosoma whitakeri) holotype, ex Ecology Division collection. Te Papa specimen number RE.001817, collected by A.H. (Tony) Whitaker on Middle Island, Mercury Islands, on 26 June 1970. Image: Te Papa

I am sure that the community of scientists and conservationists working to describe the diversity and life histories of New Zealand’s fascinating lizard fauna, and to ensure their survival, will join me in thanking Dr Gordon and his team for their generous decision.

The global penguin – Part 11. How old was the Peka Peka emperor penguin?

Te Papa’s curator of terrestrial vertebrates Dr Colin Miskelly tells the 11th instalment of the story of the emperor penguin that went where none had gone before. Previous blogs on the penguin were posted between 23 June and 12 September 2011.

One of the unknowns regarding the emperor penguin that came ashore at Peka Peka last June was how old it was. The bird did not have the jet-black chin and brightly-coloured auricular patches of a breeding adult, indicating that it was less than 4 years old. But its chin was darker than those in published images of fledgling and one-year-old emperor penguins, suggesting that it had completed at least one moult after fledging.

The emperor penguin on the beach at Peka Peka. Photos A & C, Colin Miskelly, Te Papa; B & D, Richard Gill, Department of Conservation

Most wild emperor penguins hatch in July and go to sea in December when about 5 months old. This first set of juvenile feathers last until the birds moult the following December-January, when about 17 months old. Because the Peka Peka bird came ashore in June, it would have been 11 months, 23 months or 35 months old. But which age class was it?

New light on this question has been shed by Lauren DuBois, assistant curator of birds at SeaWorld San Diego. Lauren has provided images of a captive bred bird that hatched in September 2010. By January 2012 (at 15 months old) this bird had completed its first moult, and looked the same as the adult that it is standing next to.

15-month-old emperor penguin (foreground) at SeaWorld, San Diego. Image: Lauren DuBois, SeaWorld, San Diego

Ten wild-caught juvenile emperor penguins from the July 2011 hatch were taken into captivity in December 2011. These birds came from the Cape Washington rookery on the western side of the Ross Sea, south of New Zealand. The ten birds were photographed in January 2012 when about 6 months old, and show a range of chin plumage colouration from the usual off-white through to birds as dark as the Peka Peka bird.

Based on these images, there is now little doubt that the emperor penguin that stepped ashore at Peka Peka on 20 June 2011 was about 11 months old.

Confirmation of his age supports the decision to release the bird near Campbell Island. A satellite-tracking study of fledgling emperor penguins in the Australian Antarctic sector in 1996 and 2007 managed to follow a few birds through to May and June, when they would have been 10-11 months old. One of these birds tracked as far north as 54.2 degrees south, and several others were not far behind. The last signal received from the Peka Peka emperor penguin after release was at 52.3 degrees south, within 200 km of the minimum latitude recorded in this small scale tracking study (17 birds), and 1250 km of latitude south of Peka Peka.

Also relevant is the sighting of three emperor penguins at sea east of Argentina by Maurice Rumboll on 15 September 1975. These birds were at 40.5 degrees south, which is slightly further north than Peka Peka.

When released, the Peka Peka emperor penguin was within the latitudinal zone of the Southern Ocean where juvenile emperor penguins live.

Previous blogs on this topic:

The global penguin – Part 1. How a lone emperor ventured into superstardom

The global penguin – Part 2. The young emperor penguin pushes the boundaries and is taken into care

The global penguin – Part 3. No latitude for error: a young emperor penguin a long way from home

The global penguin – Part 4. How to track a wandering emperor penguin

The global penguin – Part 5. The rocky road to fame

The global penguin – Part 6. Hitching a ride south

The global penguin – Part 7. The wandering emperor penguin enters the technological age

The global penguin – Part 8. Free at last!

The global penguin – Part 9. Heading home, or heading east?

The global penguin – Part 10. It’s only a game

For a later blog on this bird:

The global penguin – Part 12. The final word?

How much is that doggie in the window? The one with the…

A waggley tail is among the many body parts missing from this particular dog. One of the more unusual items acquired by Te Papa recently was this mounted dog’s head, claimed to be a kurī (Māori dog).

LM002857. Mounted dog head, claimed to be a kurī (Māori dog). Photo: Alan Tennyson, Te Papa

Kurī were brought to New Zealand from Polynesia by the ancestors of Māori, and were found throughout the country at the time of early European contact. Kurī were highly valued by Māori as a source of skins, meat for consumption by chiefs and priests, as well as for hunting birds. Kurī bones were used to make tools, and their bones, teeth and fur were used to make necklaces and pendants. However, kurī were rapidly replaced by or crossed with European dogs, a pattern repeated throughout Polynesia. As a result, kurī have long been extinct, and few specimens are known to exist.

Kurī were small, long-haired dogs about the size of a border collie. Like other Polynesian dogs, they were short-legged, with pricked ears, a terrier-like snout, and a powerful jaw. Most were white, or white with dark patches, but some were black.

LM000828. Kurī (Māori dog) on display in Te Papa exhibit ‘Blood, Earth, Fire: Whangai, Whenua, Ahi Ka’. Te Papa image MA_I006390

Te Papa has a mounted kurī on display in the exhibition ‘Blood, Earth, Fire: Whangai, Whenua, Ahi Ka’. This was one of two shot in the Catlins district in 1876. The only other intact mounted kuri known to exist is in Otago Museum.

Little is known about the provenance of the head recently acquired by Te Papa. Is it genuine? Is it a hoax? Is it a case of mistaken identity? We can address these questions now that the specimen is in the Te Papa collection. The Natural Environment team will be investigating further using a variety of genetic and forensic techniques.

LM002857. Mounted dog head, claimed to be a kurī (Māori dog). Photo: Alan Tennyson, Te Papa

Pukeokaoka / Jacky Lee Island – 1932 and 2012 – In the footsteps of Edgar Stead (Part 7)

Te Papa’s curator of terrestrial vertebrates Dr Colin Miskelly is researching the life and work of the Canterbury naturalist Edgar Stead (1881-1949). This includes re-taking Stead’s photos from the same photo-point, taking other images to illustrate his diaries, and describing how the ecology and wildlife of each of 10 islands has changed since Stead’s visits.

Jacky Lee Island (Pukeokaoka) is one of a cluster of islands lying off the north-east coast of Rakiura / Stewart Island. Edgar Stead became interested in the island after studying snipe on Big South Cape Island in 1931. Jacky Lee Island was the only other island off Stewart Island where snipe were known to occur; they had been seen there by John McLean and Herbert Guthrie-Smith in 1911.

The landing bay on the south side of Jacky Lee Island in 1932 and 2012, viewed from near the hut site (the hut is now derelict). Top image: Edgar Stead photograph 2001.59.382, Macmillan collection, Canterbury Museum. Below photo: Colin Miskelly, Te Papa

Unfortunately, weka had been introduced to Jacky Lee Island since McLean & Guthrie-Smith’s visit. Weka were abundant when Edgar Stead and Major Robert Wilson stayed on Jacky Lee Island in December 1932, as they were 79 years later when I visited. Weka predation caused the extirpation of snipe, mioweka (banded rail) and fernbird from Jacky Lee Island, and also huge reductions (if not extirpation) in populations of broad-billed prions, fairy prions and common diving petrels.

A weka fossicking among tidewrack on the shoreline of Jacky Lee Island, March 2012. Photo: Colin Miskelly, Te Papa

Stead found other bird species to attract his attention on Jacky Lee Island, particularly the abundant population of brown creepers (pipipi). Brown creepers are the main host of the long-tailed cuckoo in the South Island and Stewart Island, and Stead & Wilson found several brown creeper nests containing long-tailed cuckoo eggs and chicks. As a result, Stead was able to sort out long-standing confusion over what the egg of the long-tailed cuckoo looked like. This confusion resulted from Walter Buller having been given a pullet’s egg that was reported to be a cuckoo egg – possibly as a deliberate hoax.

A brown creeper on Jacky Lee Island, March 2012. Photo: Colin Miskelly, Te Papa

My visit to Jacky Lee Island was approved by the Rakiura Titi Islands Administering Body, with boat support provided by the Department of Conservation. Together they were assessing the feasibility of eradicating weka from the island.

The Maori name for Jacky Lee Island – Pukeokaoka – means ‘hill of stinging nettle’. The name is apt! As in Stead’s time, the island’s vegetation is a horrible tangle of tree nettle, Muehlenbeckia vine, bush lawyer and supplejack. I concur with Major Wilson’s observation that “it [is] the worst bush to get through of any island we have been on”.

A tangle of ongaonga (tree nettle) and pohuehue (Muehlenbeckia vine) on Jacky Lee Island, March 2012. Photo: Colin Miskelly, Te Papa

Other posts on this topic:
Taranga / Hen Island – 1933 and 2010 – In the footsteps of Edgar Stead (Part 1)
Nukuwaiata / Inner Chetwode Island – 1936 and 2011 – In the footsteps of Edgar Stead (Part 2)
KundyIsland – 1929 and 2011 – In the footsteps of Edgar Stead (Part 3)
Whenua Hou / Codfish Island – 1934 and 2011 – In the footsteps of Edgar Stead (Part 4)
Rerewhakaupoko / Solomon Island – 1931 and 2012 – In the footsteps of Edgar Stead (Part 5)
Taukihepa / Big South Cape Island – 1931 and 2012 – In the footsteps of Edgar Stead (Part 6)
Green Island – 1941 and 2012 – In the footsteps of Edgar Stead (Part 8)
Ruapuke Island – 1941 and 2012 – In the footsteps of Edgar Stead (Part 9)

Related topics:
Surveying snipe on Putauhinu Island
Are muttonbirds radio-active?

Taukihepa / Big South Cape Island – 1931 and 2012 – In the footsteps of Edgar Stead (Part 6)

Te Papa’s curator of terrestrial vertebrates Dr Colin Miskelly is researching the life and work of the Canterbury naturalist Edgar Stead (1881-1949). This includes re-taking Stead’s photos from the same photo-point, taking other images to illustrate his diaries, and describing how the ecology and wildlife of each of 10 islands has changed since Stead’s visits.

During their November-December 1931 stay on Rerewhakaupoko (Solomon Island), Edgar Stead and his companions used a small boat to visit nearby Big South Cape Island (Taukihepa) whenever sea conditions allowed. Taukihepa is the largest of the muttonbird islands at 939 ha, and lies off the south-west coast of Stewart Island.

Rerewhakaupoko (Solomon Island) at rear, and Pukeweka Island viewed from the tops of Taukihepa (Big South Cape Island). Top image taken in 1931 (Edgar Stead photograph 2001.59.380, Macmillan collection, Canterbury Museum), lower image in 2012 (photo: Colin Miskelly, Te Papa). Stead and companions stayed in one of the cluster of huts visible near the south coast of Rerewhakaupoko.

The main attraction for Stead and companions on Taukihepa was the snipe breeding among the low ‘pakihi’ heathland vegetation on the tops of the island. There were no snipe on Rerewhakaupoko. It was my long-term research on New Zealand snipes (genus Coenocorypha) that led to the discovery of Edgar Stead’s long lost diaries in Canterbury Museum in 2006.

Stead’s diaries had been in the private collection of Dr David Macmillan (who was related to Stead through their wives being cousins). Macmillan intended writing a biography of his famous friend and relative, but this was never published. Macmillan himself died in 1983, but his archive (including excised pages from Stead’s diaries, and many of Stead’s photographs) were not donated to Canterbury Museum until 2001, when his daughters sold the family home.

Putauhinu Island viewed from the summit of Taukihepa. Edgar Stead studied the now extinct South Island snipe breeding among the stunted manuka and inaka on the tops of Taukihepa in 1931. Snares Island snipe were successfully introduced to Putauhinu Island in 2005. Photo: Colin Miskelly, Te Papa

The South Island snipe (also known as the Stewart  Island snipe) was one of the species that became extinct when ship rats invaded Taukihepa and adjacent islands in 1964. The last two birds died during an unsuccessful rescue attempt in August-September 1964, and are now in the Te Papa collection.

South Island snipe at its nest on the tops of Taukihepa, December 1931. Edgar Stead photograph 2010.75.158, Canterbury Museum

The closely related Snares Island snipe was successfully translocated to Putauhinu Island 1.4 km north-west of Taukihepa in April 2005. This was the first deliberate replacement of an extinct New Zealand bird with a near relative. A survey of Putauhinu Island in March 2011 revealed that snipe were thriving, with over 300 birds present.

A Snares Island snipe on Putauhinu Island in March 2012. Photo: Ray Moss

Other posts on this topic:
Taranga / Hen Island – 1933 and 2010 – In the footsteps of Edgar Stead (Part 1)
Nukuwaiata / Inner Chetwode Island – 1936 and 2011 – In the footsteps of Edgar Stead (Part 2)
KundyIsland – 1929 and 2011 – In the footsteps of Edgar Stead (Part 3)
Whenua Hou / Codfish Island – 1934 and 2011 – In the footsteps of Edgar Stead (Part 4)
Rerewhakaupoko / Solomon Island – 1931 and 2012 – In the footsteps of Edgar Stead (Part 5)
Pukeokaoka / Jacky Lee Island – 1932 and 2012 – In the footsteps of Edgar Stead (Part 7)
Green Island – 1941 and 2012 – In the footsteps of Edgar Stead (Part 8)
Ruapuke Island – 1941 and 2012 – In the footsteps of Edgar Stead (Part 9)

Related topics:
Surveying snipe on Putauhinu Island
Are muttonbirds radio-active?

Rerewhakaupoko / Solomon Island – 1931 and 2012 – In the footsteps of Edgar Stead (Part 5)

Te Papa’s curator of terrestrial vertebrates Dr Colin Miskelly is researching the life and work of the Canterbury naturalist Edgar Stead (1881-1949). This includes re-taking Stead’s photos from the same photo-point, taking other images to illustrate his diaries, and describing how the ecology and wildlife of each of 10 islands has changed since Stead’s visits.

The second muttonbird island that Edgar Stead and companions stayed on was Solomon Island (Rerewhakaupoko), just north of Big South Cape Island (Taukihepa), off the south-west coast of Stewart Island. Stead landed on Solomon Island for a few hours the day after leaving Kundy Island in December 1929, discovering saddlebacks and bush wrens to be present, among other wildlife treasures. He resolved to return to make more detailed studies.

Putauhinu Island viewed from the southwest point of Solomon Island in 1931 (above, Edgar Stead photograph 2010.75.148, Canterbury Museum) and 2012 (below, photo by Colin Miskelly, Te Papa). The third skua in Stead's photograph was standing on a rock slab that has since tipped over, changing the profile of the rock outcrop.

After making enquiries through John Morrison of Bluff, Stead was granted permission by William Leader to stay in his muttonbirding hut at Bats Cave landing on the south coast of Solomon Island. Stead and his companions Major Robert Wilson and Sir John Hanham arrived on the island on 10 November 1931; Stead & Wilson stayed until 14 December, with Hanham replaced by Eb Hay for the last 10 days.

Top image - Edgar Stead and Sir John Hanham outside William Leader's hut on Solomon Island, November 1931 (Edgar Stead photograph 2001.59.425, Macmillan Collection, Canterbury Museum). Bottom image - the remains of William Leader's hut in March 2012 (photo: Colin Miskelly, Te Papa)

The main bird species studied by Stead and his companions on Solomon Island were South Island saddleback, bush wren (which Stead described as a new subspecies in 1936), Stewart Island robin and Stewart Island fernbird. All these species were extirpated by ship rats that invaded Solomon, Big South Cape and Pukeweka Islands in 1964. The robin and fernbird survived on other muttonbird islands (as well as at a few places on Stewart Island itself). Wildlife Service personnel succeeded in rescuing South Island saddlebacks by translocating them from Big South Cape Island to other rat-free islands. An attempt to rescue the bush wren failed, and it is now extinct.

Bush wren on Solomon Island, November 1931 (Edgar Stead photograph 2001.59.20, Macmillan Collection, Canterbury Museum)

From 1964 to 2006, Solomon Island was an avian desert, with voracious ship rats preventing successful breeding or recolonisation by many bird species. The rats were eradicated in 2006, leading to a remarkable recovery in bird life. Tui, bellbirds, tomtits and yellow-crowned parakeets are now abundant there. Robins recolonised within a year of rat eradication, and are now as abundant and tame as in Stead’s time.

Stewart Island robin on Solomon Island, March 2012. Photo: Colin Miskelly, Te Papa

South Island saddlebacks were reintroduced to Solomon Island on 20 March 2012 in a joint Rakiura Titi Committee / Department of Conservation translocation, when 8 birds were moved from Pohowaitai Island. Stead’s 1931 saddleback studies were focussed on confirming that the brown-plumaged ‘jackbird’ was the juvenile plumage of the strikingly-patterned South Island saddleback. In contrast, the otherwise similar North Island saddleback does not have a distinct juvenile plumage, a fact that Stead confirmed on a visit to Hen Island (Taranga) 2 years later.

My visit to Rerewhakaupoko in March 2012 was supported by the Rakiura Titi Committee, the Heaslip whanau and the Austin whanau, and I was generously hosted by the Heaslips. It was a great privilege to see adult saddlebacks and jackbirds back on Solomon Island 80 years after Stead had seen the same, and to share this magical experience with my hosts.

Jackbird (juvenile South Island saddleback - on left) and adult South Saddleback photographed 3 days after they were re-introduced to Solomon Island, March 2012. Photos: Colin Miskelly, Te Papa

One of the other bird species that Stead encountered on Solomon Island was the broad-billed prion (parara). This species suffered enormous mortality in a severe storm in July 2011, with hundreds of thousands of birds killed. Numbers were much reduced on Solomon Island in 2012 compared to previous years, according to my hosts. I saw seven parara, and was able to collect feather samples from five birds to allow genetic comparisons with birds washed up on North Island beaches, and held by Te Papa.

Broad-billed prion (parara) on Solomon Island, March 2012. Photo: Colin Miskelly, Te Papa

Other posts on this topic:
Taranga / Hen Island – 1933 and 2010 – In the footsteps of Edgar Stead (Part 1)
Nukuwaiata / Inner Chetwode Island – 1936 and 2011 – In the footsteps of Edgar Stead (Part 2)
KundyIsland – 1929 and 2011 – In the footsteps of Edgar Stead (Part 3)
Whenua Hou / Codfish Island – 1934 and 2011 – In the footsteps of Edgar Stead (Part 4)
Taukihepa / Big South Cape Island – 1931 and 2012 – In the footsteps of Edgar Stead (Part 6)
Pukeokaoka / Jacky Lee Island – 1932 and 2012 – In the footsteps of Edgar Stead (Part 7)
Green Island – 1941 and 2012 – In the footsteps of Edgar Stead (Part 8)
Ruapuke Island – 1941 and 2012 – In the footsteps of Edgar Stead (Part 9)

Related topics:

Riders of the storm – thousands of seabirds perish on New Zealand shores
Riders of the storm – the severely depleted next generation
Are muttonbirds radio-active?

Are muttonbirds radioactive?

The March 2011 Japanese earthquake and following tsunami took a terrible human toll, and also had devastating impacts on wildlife. As the tsunami tracked east it washed over the low-lying atolls of the north-western Hawaiian islands, killing thousands of albatrosses and petrels. The tsunami also crippled the Fukushima-Daiichi nuclear power-plant, sending a plume of radiation across the North Pacific, which contaminated the marine food chain.

Adult sooty shearwaters (kaiaka) depart from Rerewhakaupoko (Solomon Island) at dawn. Photo: Colin Miskelly, Te Papa

Several species of New Zealand-breeding seabirds migrate to the North Pacific during the southern winter, and were likely to have been exposed to radioactive fallout. The best known of these is the sooty shearwater (muttonbird), of which the entire population is in the North Pacific during June-September. Shearwaters are top predators, feeding on krill, and small fish and squid. Radio-active isotopes of cesium and iodine in dust that settle on the sea are taken up by phytoplankton, and become concentrated at each higher trophic level in the food chain. It is not yet known whether radiation exposure from the Fukushima-Daiichi nuclear disaster was sufficient to cause lethal or sub-lethal effects on sooty shearwaters and other top predators in the North Pacific.

Sooty shearwaters moult and replace their feathers when in the North Pacific, growing a new set each year to ensure top aerodynamic performance on their record-breaking migrations. Radioactive isotopes of cesium can be incorporated in growing feathers and other tissues of birds. It is not known whether radioactive compounds are metabolised during egg formation, potentially passing contamination to the next generation.

Adult sooty shearwater (kaiaka) at its burrow entrance, Kundy Island. Photo: Colin Miskelly, Te Papa

Muttonbirders preparing for the 2012 harvest of titi (sooty shearwater chicks) on islands around Rakiura/Stewart Island were concerned about potential human health effects from handling and eating titi. The topic was discussed at length in early February at the Rakiura Titi Committee permit day meeting in Colac Bay. Dr Colin Miskelly (Te Papa’s curator of terrestrial vertebrates) was at the meeting, and offered to arrange for radiation levels to be measured in titi, if the muttonbirders were able to collect a sample of pre-season chicks. Funds to undertake the analyses were made available by Landcare Research. Staff from Landcare Research are studying related seabird species on islands in the Bay of Plenty.

A muttonbirder holds a pre-season titi (sooty shearwater chick). Photo: Colin Miskelly, Te Papa

Fifteen titi each were collected by Rakiura Titi Committee representatives from Taukihepa (Big South Cape Island) south-west of Rakiura, and Herekopare Island to the north-east. The 30 titi were prepared by muttonbirders as if for consumption, then forwarded to the National Radiation Laboratory for analysis. The results showed no measurable radioactive iodine-131 or cesium-134 or 137 contamination in any of the birds. The results were provided to the Rakiura Titi Committee 2 weeks before the start of the 2012 titi season.

“This is great news for the muttonbirders” Rakiura Titi Committee chairman Stewart Bull said. “We are going through tough times following the Easy Rider tragedy. News that the titi are safe to capture and eat gives us all reason to think more positively about the season ahead”.

Good enough to eat. Roast titi await palatability testing. Photo: Colin Miskelly, Te Papa

No evidence that stoats have impacted on Kapiti Island’s birds

Kapiti Island is one of New Zealand’s premier bird sanctuaries. It is home to nationally important populations of little spotted kiwi, kaka, North Island saddleback, stitchbird and North Island robin, as well as other threatened bird species. The island was considered to be free of all introduced mammal pests after rats were eradicated in 1996. However, a stoat was seen there in late 2010, and intensive trapping effort by the Department of Conservation (DOC) resulted in three stoats being killed during 2011. Inspection and analysis of these animals indicate that a pregnant female stoat probably reached the island during 2009, and gave birth towards the end of that year. Trapping and survey efforts continue, and it is unknown whether any stoats are still present.

The skeleton of the male stoat trapped on Kapiti Island in February 2011 is held by Te Papa (LM 2603). Photo: Colin Miskelly, Te Papa

Saddlebacks are extremely vulnerable to stoat predation as the birds not only nest in tree holes, but roost in holes every night. Birds that roost or nest in holes have little hope of escape when a predator comes in through the only exit. Saddlebacks are also noisy and conspicuous, and so were expected to be the first bird species to noticeably decline if stoats started to have an impact on bird populations on Kapiti Island. Stoats rapidly extirpated saddlebacks from Maud Island and Motukawanui Island when they invaded in 1982 and c1985 respectively.

North Island saddleback displaying. Photo: Rob Cross

Members of the Ornithological Society of New Zealand (OSNZ) completed 3050 ‘five-minute bird counts’ on Kapiti Island between April 2009 and January 2012. Counts were completed every 3 months during a period completely overlapping with when stoats were believed to be present. Analyses of these counts revealed no reduction in saddleback range or numbers on the island over these 3 years, supporting DOC’s survey results indicating that very few if any stoats remain on the island.

Timeline for stoat arrival, detection and the trapping of three individuals on Kapiti Island. The curve shows saddleback count results over the same period (average number of birds counted per 5 minutes), with no apparent reduction during the time that stoats were known to be present. Image: Colin Miskelly, Te Papa

It is great news that saddlebacks continue to thrive on Kapiti Island. This can be attributed to the huge effort that DOC staff have made to eradicate the invading stoats.

OSNZ established 61 permanent count stations on Kapiti Island in the 1970s, and has undertaken 3-year blocks of counts approximately once a decade ever since. The OSNZ counts were organised by Colin Miskelly (Te Papa’s Curator Terrestrial Vertebrates). Transport and food costs were met by DOC as part of ongoing monitoring of the ecological health of Kapiti Island.

One step forward after three steps back – slow progress with restoring populations of New Zealand seabirds

Fairy prion chick being banded on Mana Island, January 2012. Photo: Kate McAlpine & Colin Miskelly

2011 was a grim year for New Zealand seabirds. They suffered the triple-whammy of nuclear-fallout from the crippled Fukushima Daiichi power plant affecting the North Pacific non-breeding grounds of at least four species, a severe winter storm that killed up to half a million prions, then the Rena oil spill believed to have killed several thousand birds. Compared to the scale of these disasters, attempts to restore seabird populations appear almost futile.

Storm-wrecked prions at Paekakariki, Wellington west coast, July 2011. Photo: Colin Miskelly

Diving petrels and fluttering shearwaters killed by the Rena oil spill, Bay of Plenty, October 2011. Photo: Colin Miskelly

For the past two decades, New Zealand conservationists have been developing techniques for restoring burrow-nesting petrels (including shearwaters and prions) to sites safe from predators. This required overcoming the birds’ strong homing instincts by translocating then hand-feeding young chicks until they completed their feather development and flew out to sea. This method has now been tried on more than ten species of petrels, but progress is glacially slow. All petrel species lay only a single egg per year, and many do not start breeding (or even return to land) until they are four or more years old.

Translocated fluttering shearwater chick being fed a sardine smoothy, Mana Island, January 2007. Photo: David Cornick

Mana Island, off the Wellington west coast, has been the single site where the greatest effort has been made to restore burrow-nesting petrels. Between 1997 and 2008, over 700 chicks of three species were translocated to the island, and cared for by teams of contractors and volunteers organised by the Department of Conservation and the Friends of Mana Island (a community conservation group). The younger birds are still returning, but over 60 have been recorded back so far.

All three species are now nesting on the island, with increasing numbers of chicks being recorded each year. During the 2011/12 breeding season, 19 chicks are known to have survived to fledging – 8 common diving petrels, 7 fluttering shearwaters and 4 fairy prions. Other chicks are likely to have been produced in undetected or unmonitored burrows (some of the latter are located at inaccessible cliff sites).

In addition to the translocated chicks that returned as adults, a few unmarked birds of each species have been attracted by loudspeakers broadcasting petrel calls each night, and perhaps also by the birds that have returned to the island.

Colin Miskelly holding a fluttering shearwater chick, Mana Island, January 2012. Photo: Kate McAlpine & Colin Miskelly

Restoring seabirds takes time and requires a lot of effort. Understanding how to proceed, at what cost, and the likely outcomes, is essential as we consider how to offset the impacts of disasters caused directly or indirectly by humans.

Further information
Te Papa prion wreck blogs
Te Papa Rena oil spill blogs
Miskelly, C.M.; Taylor, G.A.; Gummer, H.; Williams, R. 2009. Translocations of eight species of burrow-nesting seabirds (genera Pterodroma, Pelecanoides, Pachyptila and Puffinus: Family Procellariidae). Biological conservation 142: 1965-1980.

Whenua Hou / Codfish Island – 1934 and 2011 – In the footsteps of Edgar Stead (Part 4)

As part of a project to publish the wildlife diaries of Edgar Stead, I am revisiting some of the islands that Stead camped on during the period 1929-1947. The main focus is describing how the ecology of the islands has changed since Stead’s time. The visits also provide an opportunity to take photographs to illustrate the diaries.

Stead and his companions Major Robert Wilson and Percy Elworthy were the first naturalists to visit 1400 ha Codfish Island, north-west of Stewart Island. They camped at the western end of Sealers Bay 20 Dec 1934 to 7 Jan 1935, and used a small boat to explore the island and its offshore islets.

Edgar Stead's 1934-35 camp on Codfish Island. Photo: Edgar Stead. Macmillan collection, 2001.59.116, Canterbury Museum. Permission of Canterbury Museum, Christchurch, New Zealand must be obtained before any re-use of this image.

Location of Edgar Stead's 1934-35 campsite on Codfish Island (the end of Sealers Bay is visible at lower right). Photo: Colin Miskelly, Te Papa, December 2011

The major discovery of their expedition was that Codfish Island was a breeding site for Cook’s petrel, otherwise known only from Little Barrier Island 1200 km to the north. Stead estimated 30,000 to 40,000 Cook’s petrels to be on the island, and noted that they were being killed by weka (a predatory rail native to mainland New Zealand, but introduced to Codfish Island). By the late 1970s, Cook’s petrels were approaching extinction on Codfish Island, prompting the Wildlife Service to eradicate weka, along with brush-tailed possums which had been introduced from Australia for fur-trapping.

Cook's petrel at burrow entrance at night, Codfish Island. Photo: Colin Miskelly, Te Papa, December 2011

Edgar Stead also noticed that the fernbirds on Codfish Island were darker than those on other islands off Stewart Island. In 1936 he named the Codfish Island fernbird Bowdleria punctata wilsoni in honour of his friend and companion.

Codfish Island fernbird exiting nest among cocksfoot, Sealers Bay, Codfish Island. Photo: Colin Miskelly, Te Papa, December 2011

Codfish Island is famous as the most important site for the kakapo recovery programme. It is a strictly controlled nature reserve, and I am grateful to the Department of Conservation (DOC) and the Whenua Hou Advisory Committee for granting me the privilege to visit. My five companions on the island were all DOC staff or volunteers working with kakapo. These critically endangered flightless parrots were transferred from Stewart Island (where they were being killed by feral cats) to Codfish Island from 1987 onwards.

Kakapo at night on Codfish Island. Photo: Colin Miskelly, Te Papa, December 2011

Further information on the wildlife of Codfish Island is posted on http://www.birdingnz.net/forum/viewtopic.php?f=3&t=1516 and http://blog.tepapa.govt.nz/2011/12/13/riders-of-the-storm-the-severely-depleted-next-generation/

Other posts on this topic:
Taranga / Hen Island – 1933 and 2010 – In the footsteps of Edgar Stead (Part 1)
Nukuwaiata / Inner Chetwode Island – 1936 and 2011 – In the footsteps of Edgar Stead (Part 2)
KundyIsland – 1929 and 2011 – In the footsteps of Edgar Stead (Part 3)
Rerewhakaupoko / Solomon Island – 1931 and 2012 – In the footsteps of Edgar Stead (Part 5)
Taukihepa / Big South Cape Island – 1931 and 2012 – In the footsteps of Edgar Stead (Part 6)
Pukeokaoka / Jacky Lee Island – 1932 and 2012 – In the footsteps of Edgar Stead (Part 7)
Green Island – 1941 and 2012 – In the footsteps of Edgar Stead (Part 8)
Ruapuke Island – 1941 and 2012 – In the footsteps of Edgar Stead (Part 9)

By Colin Miskelly, Curator Terrestrial Vertebrates

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