Saving Tasmanian devils


This video from Australia is called Tasmanian Devil.

From Wildlife Extra:

Hope for threatened Tasmanian devils with scientific breakthrough

Research paves way for the development of a vaccine for the contagious cancer which is driving Tasmanian devils to the brink of extinction.

March 2013. New research paves the way for the development of a vaccine for the Tasmanian devil, currently on the brink of extinction because of a contagious cancer.

100% mortality

It has been less than two decades since scientists discovered the contagious cancer devil facial tumour disease (DFTD) which causes 100 per cent mortality in the endangered marsupials. The facial cancer, which spreads when the devils bite each other’s faces during fighting, kills its victims in a matter of months. As it has already wiped out the majority of the population with sightings of devils reduced by 85 per cent, scientists are desperate to find out more about the mysterious cancer which somehow manages to evade the devils’ immune system.

Complex problem

Until now, scientists have believed that the tumours were able to avoid detection by the immune system because the Tasmanian devils have very little genetic diversity (preventing the immune system from recognising the tumour as foreign). However, a University of Cambridge led collaboration with the Universities of Tasmania, Sydney and South Denmark has discovered that the explanation is more complex.

On the surface of nearly every mammalian cell are major histocompatibility complex (MHC) molecules. These molecules enable the immune system to determine if a cell is friend or foe, triggering an immune response if the cell is foreign and a potential threat. The new research, published in the journal PNAS, reveals that DFTD cancer cells lack these critical molecules, thereby avoiding detection by the devils’ immune system.

Professor Jim Kaufman, from the University of Cambridge’s Department of Pathology, said: “Once it was found that the cancer was escaping from the devils’ immune system, scientists needed to figure out how.”

Cure?

The researchers found that the DFTD cells have lost the expression of MHC molecules, but that the genes that code for these molecules are still intact. This means that these genes could potentially be turned back on. Indeed, the scientists showed that by introducing signalling molecules such as interferon-gamma, a protein which triggers the immune response, the DFTD cells can be forced to express MHC molecules.

Dr Hannah Siddle, lead author of the paper from the University of Cambridge, said: “Developing a vaccine based on our research could tip the balance in the favour of the devil and give them a fighting chance.”

“However, we still face some hurdles. The tumour is evolving over time and any vaccine programme would have to take this into consideration. Also, because of the difficulties of vaccinating a wild population, it may be more efficient to use a vaccine in the context of returning captive devils to the wild.”

Contagious cancer

Although the only other contagious cancer has been found in dogs (canine transmissible venereal cancer), the rapid development of DFTD highlights how quickly they can emerge.

Professor Kaufman added: “Our study has implications beyond the Tasmanian devil. Sooner or later a human strain of contagious cancer will develop, and this work gives us insight into how these diseases emerge and evolve.”

The research was funded by the Wellcome Trust.

Information courtesy of Cambridge University.

Good Australian parrot news


This video from Australia is called Critically endangered Orange-bellied Parrot.

From Wildlife Extra:

Encouraging breeding season for Critically Endangered Orange-bellied parrot

At least 23 fledglings counted in Tasmania

March 2013. According to Mark Holdsworth, Tasmanian Recovery Program Coordinator for the Orange Bellied Parrot, volunteers at Melalueca, where the entire population of Orange-bellied parrots spend the winter, have spotted 4 unbanded juvenile parrots together at the feedtable. With 19 juveniles already banded , this means there are now at least 23 juvenile birds this season and possibly more. Considering there were 14 juveniles last year, this is very encouraging news for the species survival in the wild.

Wild birds breeding

“The other news during the 2012 breeding season was encouraging, with all known adult females participating in breeding at Melaleuca and at least 14 young fledging. The team decided it wasn’t necessary for any more wild birds to be taken into captivity this year as part of the Captive Breeding program.”

Captive breeding

“The successful captive breeding program, based at Healesville Sanctuary in Victoria, as well as at other facilities in Tasmania, NSW and South Australia, now has more than 200 birds and the team is considering the possibility of a release of captive-bred birds in the near future.”

The Orange-bellied Parrot is a migratory bird, which breeds only in coastal south-west Tasmania and spends the winter in coastal Victoria and South Australia.

The Orange-bellied Parrot National Recovery Team consists of representatives of the Commonwealth, Victorian, Tasmanian and South Australian governments, Zoos Victoria, Adelaide Zoo, Birdlife Australia, the Tasmanian Conservation Trust and threatened species experts.

To get the latest update, go to the Orange-bellied parrot Facebook page.

Tasmanian tiger extinction, new research


This video says about itself:

Here is a combination of all the footage of the Tasmanian Tiger, now believed to be extinct.

From Wildlife Extra:

Humans alone responsible for extinction of Tasmanian Tiger

February 2013. Humans alone were responsible for the demise of Australia’s iconic extinct native predator, the Tasmanian Tiger or thylacine, according to a new study led by the University of Adelaide.

Using a new population modelling approach, the study contradicts the widespread belief that disease must have been a factor in the thylacine’s extinction.

Government sponsored hunting

The thylacine was a unique marsupial carnivore found throughout most of Tasmania before European settlement in 1803. Between 1886 and 1909, the Tasmanian government encouraged people to hunt thylacines and paid bounties on over 2000 thylacine carcasses. Only a handful of animals were located after the bounty was lifted and the last known thylacine was captured from the wild in 1933.

“Many people, however, believe that bounty hunting alone could not have driven the thylacine extinct and therefore claim that an unknown disease epidemic must have been responsible,” says the project leader, Research Associate Dr Thomas Prowse, School of Earth and Environmental Sciences and the Environment Institute.

“We tested this claim by developing a ‘metamodel’ – a network of linked species models – that evaluated whether the combined impacts of Europeans could have exterminated the thylacine, without any disease.”

The mathematical models used by conservation biologists to simulate the fate of threatened species under different management strategies (called population viability analysis or PVA) traditionally neglect important interactions between species. The researchers designed a new approach to PVA that included species interactions.

“The new model simulated the directs effects of bounty hunting and habitat loss and, importantly, also considered the indirect effects of a reduction in the thylacine’s prey (kangaroos and wallabies) due to human harvesting and competition from millions of introduced sheep,” Dr Prowse says.

Disease not a factor

“We found we could simulate the thylacine extinction, including the observed rapid population crash after 1905, without the need to invoke a mystery disease. We showed that the negative impacts of European settlement were powerful enough that, even without any disease epidemic, the species couldn’t escape extinction.”

The study ‘No need for disease: testing extinction hypotheses for the thylacine using multi-species metamodels‘, which also involved Professors Corey Bradshaw and Barry Brook from the University of Adelaide’s Environment Institute, Professor Chris Johnson from the University of Tasmania, and Dr Bob Lacy, Chicago Zoological Society, has been published online in the Journal of Animal Ecology.

Saving Australia’s orange-bellied parrots


Neophema chrysogaster male

From Wildlife Extra:

Critically Endangered Orange-bellied parrot mystery

The ‘Orange’ Pimpernel? – Disappearing parrot intrigues recovery team

September 2012. With a wild population of less than 50, it’s not surprising that the location of a summer hide-out used by a male Orange-bellied Parrot (Neophema chrysogaster) is of great interest to the team trying to save the species from extinction.

Where does the bird go in the breeding season?

In its 2012 update, the Orange-bellied Parrot recovery team has revealed that an eight year old male bird, seen during winter around Victoria’s Port Phillip Bay, has not been seen for several seasons at the only known breeding site for the species at Melaleuca on Tasmania’s west coast.

Recovery Team member Peter Menkhorst, from the Department of Sustainability and Environment’s (DSE) Arthur Rylah Institute (ARI) said: “We have been aware of this bird since he was banded as a juvenile at Melaleuca in the summer of 2004/05 and he has been seen in Victoria over several winters, but we still don’t know where he goes during the breeding season. With such small numbers in the wild it is of great interest to the recovery team to find out if there is another, previously unknown, site where this species breeds,” Mr Menkhorst said.

No undiscovered population

“Unfortunately, no matter where he is going, we know from the small numbers coming to the winter feeding grounds in Victoria and South Australia that there is no large undiscovered breeding population of these birds.”

Wild birds breeding

“The other news during the 2012 breeding season was encouraging, with all known adult females participating in breeding at Melaleuca and at least 14 young fledging. The team decided it wasn’t necessary for any more wild birds to be taken into captivity this year as part of the Captive Breeding program.”

Captive breeding

“The successful captive breeding program, based at Healesville Sanctuary in Victoria, as well as at other facilities in Tasmania, NSW and South Australia, now has more than 200 birds and the team is considering the possibility of a release of captive-bred birds in the near future.”

The Orange-bellied Parrot National Recovery Team consists of representatives of the Commonwealth, Victorian, Tasmanian and South Australian governments, Zoos Victoria, Adelaide Zoo, Birdlife Australia, the Tasmanian Conservation Trust and threatened species experts.

Tasmanian swift parrot endangered


This video from Australia is called The Swift Parrot – Lathamus Discolor.

From Emu, a journal of BirdLife Australia:

Nesting requirements of the endangered Swift Parrot (Lathamus discolor)

30 May 2012

Abstract

Declines in avian biodiversity are being reported worldwide. A better understanding of the ecology of many species is fundamental to identifying and addressing threatening processes and developing effective mitigation measures.

The Swift Parrot (Lathamus discolor) is listed as endangered and is an obligate migrant that breeds only in Tasmania, wintering in mainland Australia. The species nests in tree-hollows and forages primarily on flowers of the Tasmanian Blue Gum (Eucalyptus globulus) and Black Gum (Eucalyptus ovata) during the breeding season.

Surveys for Swift Parrot nests conducted over three consecutive breeding seasons identified 130 Swift Parrot nests in 117 trees. Sites were between 12 and 130 ha in area with up to 49 nests found at an individual site.

Swift Parrot nest-trees were characterised as being large eucalypts (mean diameter at breast height = 105 cm) with five or more potential hollows (mean = 8.6) and showing clear signs of senescence. Reuse of nests was uncommon over the 3 years and the infrequency of reuse was most likely related to poor flowering of Tasmanian Blue Gums around nesting sites in years following recorded nesting.

To protect the species, conservation actions need to account for the spatiotemporal variation in the availability of Swift Parrot breeding habitat and recognise there may be several years between the use of a particular site. Given the number of nests found at individual sites this will require the management or reservation of suitable forest stands with old-growth characteristics across the landscape, rather than focussing on individual trees or historical nesting sites.

Ground-based survey methods both overestimate and underestimate the abundance of suitable tree-cavities for the endangered Swift Parrot: here.

Tasmanian devil babies born


This video, from Taronga zoo, in Sydney, Australia, says about itself:

Taronga’s Tasmanian Devil Keepers got their first hands-on check of four little devil joeys, the first born at the Zoo this breeding season.

The youngsters, which were born to mother, Nina were snuggled tightly in their maternal nest and keepers gently lifted them out to check their body condition and determine their sex.

Closer inspection revealed that Nina had given birth to one female and three male joeys.

See also here.

October 2011. Culling will not control the spread of facial tumour disease among Tasmanian devils, according to a study published in the British Ecological Society’s Journal of Applied Ecology. Unless a way of managing the disease is found, the iconic marsupial could become extinct in the wild within the next 25 years: here.

October 2011: The release of 12 Gilbert’s potoroos into a tiny mainland population on Western Australia’s south coast is aiding the recovery of the world’s rarest marsupial: here.

Back from the dead: Gilbert’s potoroo: here.

A botanical garden with many conifers


In this video are some cycads at the Fairchild Tropical Botanic Garden in Miami, Florida, USA, on January 14, 2007.

Pinetum Blijdenstein in Hilversum in the Netherlands is a somewhat unusual botanical garden. In most such gardens, the emphasis is on flowering plants, after the age of dinosaurs the majority of the world’s plant species.

However, in this pinetum, as the name says, the emphasis is on gymnospermic plants, especially conifers. There are over 500 coniferous species in the world. Outside in the garden of the pinetum, those conifers are surrounded by gingkos, rhododendrons and poppies. In the greenhouses, there are, under specific climatological conditions and accompanied by cycads (about 70 species in this pinetum), subtropical and even tropical conifer species. There is also an extensive collection of Tasmanian plants.

The pinetum has 2500 species, including 49 of the 63 coniferous species worldwide threatened by extinction.

In both outdoor and (greenhouse) indoor pools, turtles are swimming. They are two subspecies of Trachemys scripta: the red-eared slider, and the Cumberland turtle. In the outdoor pool, also pondskaters. In the subtropical greenhouse pool, goldfish. Plants in that greenhouse include the Bhutan cypress, and Araucaria nemorosa.

In the hottest greenhouse are the Lebombo cycad from South Africa, and young plants of Kaori blanc from New Caledonia.

Cycads in Belgium: here.

Turtles in New York City: here.

Red-eared slider turtles in Australia: here.