Tag Archives: M.V. Rena

Rena oil spill – update on bird mortality

The team of Te Papa bird specialists is continuing to help at the wildlife recovery centre in Tauranga as both live and dead oiled birds continue to come ashore 3 weeks after the grounding of the M.V. Rena.

Our job is primarily to make sure that dead birds are correctly identified and, working with Massey University vets, to make an assessment about whether or not they are victims of the oil spill.

Alan Tennyson holding an oiled penguin. Photograph by A. Tennyson, Te Papa

A dead little penguin covered in oil. Photograph by A. Tennyson, Te Papa

The biggest surprise during the last week was finding a dead Chatham Island albatross – a rare species confined to nesting on a single island in the Chatham group. After careful examination, we determined that it was a breeding female but it was not oiled, so its death was probably a natural event unrelated to the grounding of the Rena.

A Chatham Island albatross that apparently died of natural causes being dissected by Massey vet Stuart Hunter. Photograph by A. Tennyson, Te Papa

A Chatham Island albatross that apparently died of natural causes being dissected by Massey vet Stuart Hunter. Photograph by A. Tennyson, Te Papa

While more than a thousand dead birds were recovered in the first 2 weeks after the grounding, the number found during the last week has now, fortunately, dropped to about 20 per day. While nearly all the live oiled birds found have been little penguins, the most common dead birds (of the approximately 1,300 examined) continue to be petrels – in particular diving petrels, which make up about half of those found. The next most common victims are two species that only breed in New Zealand: fluttering shearwater (about 20%) and Buller’s shearwater (about 10%).

These little penguins are recuperating in a purpose-built swimming pool. Filmed by A. Tennyson, Te Papa

The most common victims of the oil spill: hundreds of diving petrels have died. Photograph by A. Tennyson, Te Papa

The most common victims of the oil spill: hundreds of diving petrels have died. Photograph by A. Tennyson, Te Papa

We also examined a dead northern giant petrel that had eaten a lot of milk powder, which we suspect caused its death. Giant petrels are the size of small albatrosses and are well known for their scavenging habits. Many of the containers onboard the Rena contain milk powder, so this may be another unexpected danger for birds resulting from the grounding.

Shane Baylis with a giant petrel that appeared to have died from eating milk powder that spilled from one of the Rena's containers. Photograph by A. Tennyson, Te Papa

Shane Baylis with a giant petrel that appeared to have died from eating milk powder that spilled from one of the Rena's containers. Photograph by A. Tennyson, Te Papa

As salvors continue to battle to remove the remaining oil and stabilise the wrecked Rena, we don’t know how much more oil (and milk powder) is going to end up in the sea. It will be difficult to determine the impacts on seabird populations but the information that we are gathering will be a crucial part of this.

A little blue penguin covered in oil. Photograph by A. Tennyson, Te Papa

Alan Tennyson holding a dead little penguin covered in oil. Photograph by A. Tennyson, Te Papa

By Alan Tennyson, Curator Natural Environment

Oilspill update

Dead oiled wildlife continues to be collected from Bay of Plenty beaches, and the Te Papa Natural Environment team has been assisting with the Wildlife Recovery Centres activities of documenting and recovering species affected by the oil. The species found oiled include the many birds which nest in the Bay of Plenty: most birds returned are from locally common seabird species – Common Diving Petrel and Fluttering Shearwater – the latter a New Zealand endemic species. Aside from these local birds, there are species which breed far further afield, such as the Buller’s Shearwater (from Poor Knights Islands in Northland); the giant petrels from sub-Antarctic sites (some breed in New Zealand but also found around the Southern Ocean), and Blue Petrels likely to be from the Kerguelen Islands in the Indian Ocean. The one Wandering Albatross recovered last week has been identified as coming from a population outside of the New Zealand region, as its body measurements match Indian Ocean or Atlantic Ocean populations, and not those of the smaller-sized southern New Zealand (Antipodes and Auckland Islands) populations.

Red-billed gull oiled at Maketu. Photograph by and reproduced courtesy of Dominique Filippi

Red-billed gull oiled at Maketu. Photograph by and reproduced courtesy of Dominique Filippi

The grim job of sorting through the 1250 or so dead oiled birds returned to the centre by last weekend has to be put into perspective within the very positive atmosphere at the Wildlife Recovery Centre in Tauranga. It has been an amazing operation to be part of. Each hour throughout the day, volunteers, who’d been searching beaches under the wildlife recovery scheme being run by Maritime NZ, arrive with bags and boxes of animals, alive and dead. The Centre is incredibly well run and the spirit of cooperation is very strong. The purpose of ensuring good outcomes for the wildlife affected reigns on the site. The area houses many marquees and structures to enable the washing, feeding, and monitoring the penguins, shags and shore birds which are being recovered to health.

Volunteers preparing for cleanup at Papamoa Beach. Photograph by and reproduced courtesy of Dominique Filippi

Volunteers preparing for cleanup at Papamoa Beach. Photograph by and reproduced courtesy of Dominique Filippi

We worked mainly in the Post-Mortem tent, alongside Veterinary Scientists from Massey University, to identify, and categorise dead wildlife into groups by species and breeding status, and to ascertain how the birds had died. It is a sort of grim zoological forensic study, but done with the intention of finding out as much about the species’ origins (type of bird and population of origin) as possible, to track potential population impacts later on. When the Post-Mortem tent got too much for us, it was a welcome respite to poke our heads into the “Penguin Tent” and witness the fiesty little fellows in their blue tuxedos getting ready for their sardine smoothies. Even more entertaining was seeing the penguins go for their rostered swims in the exercise pools, watched over by their wardens, some of whom had heavily taped fingers as a preventative measure against the damage than can be inflicted by little penguin beaks.

Dead oiled birds being examined by Te Papa scientists. Photograph by and reproduced courtesy of Dominique Filippi

Dead oiled birds being examined by Te Papa scientists. Photograph by and reproduced courtesy of Dominique Filippi

I was very touched by the generosity of the Tauranga locals, when stopping for a much needed cuppa in the Mess Tent, to see piles of plated muffins and other tempting morsels, with messages of support sticky-labeled on the food-wrap encouraging us “Keep up the good work” and “For all those hard working wildlife volunteers”. The centre even had recycling facilities for the waste.

Te Papa has supplied some critical expertise to help a diverse group of professionals and volunteers in the Wildllife Recovery Centre, as our most expert scientists in bird identification are needed to work out which species are which among the oiled dead birds. Our retired curator of birds, Sandy Bartle, along with current curators Colin Miskelly and Alan Tennyson have all played important roles. We will continue to work alongside Massey University vets to cover the wildlife identification activity.

Susan Waugh, Senior Curator Natural Environment.

What bird is that? The grim task of identifying seabirds killed by the M.V. Rena oil spill

Fluttering shearwaters coated in oil from the M.V. Rena. Photo: Colin Miskelly, Te Papa

Te Papa bird staff are providing expert assistance to Maritime New Zealand and Massey University veterinary staff in the form of identifying birds affected by the oil spill. Three current and one former staff member have been a ‘tag team’ since 12 October, identifying the hundreds of corpses recovered by the teams patrolling the beaches, plus any picked up at sea. There are many seabird species potentially present in the Bay of Plenty at this time of year. Making sure that each bird is correctly identified is essential for understanding the impacts of the spill. This information will be crucial if there is any potential for environmental mitigation after the clean-up is complete.

Colin Miskelly (Te Papa's Curator Terrestrial Vertebrates) with a heavily oiled northern giant petrel. Photo: Colin Miskelly, Te Papa

Identifying heavily oiled birds is a challenge, especially when the oil is thick and tar-like. Not only are all plumage markings, bill and leg colour concealed, but it can even be difficult to determine the shape of the bill, which is otherwise diagnostic for many species. For some birds it is necessary to use body structure – the relative length of the tail separates the similarly-sized Buller’s and sooty shearwaters. For others, knowing the one crucial identification character to check (e.g. leg colour) to separate species pairs means that a bird can be identified more rapidly.

Karen and Lucy with oiled seabirds inside the pathology tent. Photo: Colin Miskelly, Te Papa

The work is dirty, smelly, frustrating, and deeply saddening for anyone who knows the beauty of these birds in their prime. Over 20 species of seabird have been identified dead and coated with oil so far, ranging in size from tiny white-faced storm petrels to an enormous wandering albatross. The three main species affected (common diving petrel, fluttering shearwater and Buller’s shearwater) are not threatened species, but their populations will take decades to recover from a mortality event of this scale. All lay a maximum of one egg per pair each year, and the two shearwaters do not start to breed until they are about 5 years old.

 
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