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Yearly Archives: 2013
Next week I will be heading out on my first official field trip.
I am well equipped to working in the arid deserts of Australia, but working with wolves and deer in the snow is a whole new ball game.
I will be working with students from the Predator Ecology Lab at the University of Washington (http://faculty.washington.edu/wirsinga/) who are investigating the impact of recolonising gray wolves on deer species in Washington state. The study site is located in the Okanogan and Ferry counties where there are sites with and without wolves:
Map courtesy of Justin Dellinger (http://students.washington.edu/jad17/Wolf-Deer%20Project%20Report%201.pdf)
The research group are putting camera collars on the deer to look at short term behavioural changes in response to recolonising wolves. They are also using GPS collars to collect long-term movement data. The bulk of the field work will involve catching deer in traps like those shown below:
Photos courtesy of Justin Dellinger (http://students.washington.edu/jad17/Wolf-Deer%20Project%20Report%201.pdf)
Why is the research important?
Wolves were never re-introduced into Washington state, like they were in Montana, Wyoming and Idaho. However, since the mid 1990’s wolf populations in North America have begun to recover and they have expanded into other areas. In fact, by March 2013 the Washington Department of Fish and Wildlife confirmed that there were at least 10 wolf packs in Washington state – the packs have all been given names and can be followed on this link: http://wdfw.wa.gov/conservation/gray_wolf/packs/.
With the newly established presence of a top-predator in Washington state it provides an ideal opportunity to assess how ecological communities, who have lived for almost 70 years without wolves, will respond. The research will also help to develop management plans and shared use of deer by (i) hunters, which bring in substantial revenue from buying tags and (ii) wolves, which are afforded protection and can also attract tourist dollars.
I am very much looking forward to learning more and reporting back to you all about my time on the Washington Wolf-Deer Project: https://nwsportsmanmag.com/editors-blog/to-cry-or-not-to-cry-wolf-or-something-in-between/
In Australia, there has been more talk recently regarding proposals to reintroduce Tasmanian Devils to the mainland (https://theconversation.com/should-we-move-tasmanian-devils-back-to-the-mainland-16388).
So it seemed timely to consider a couple of more established examples of “rewilding” that I encountered on a recent journey through Texas, New Mexico and Arizona. I’m talking about black bears in Big Bend, Texas, and the Californian condor in the Grand Canyon.
The Big Bend Story
Apart from scattered sightings, bears were virtually absent in Big Bend when the National Park was established in 1944. This was primarily because bears were shot and trapped by ranchers, federal pest control agents and recreational hunters. Widespread loss of habitat played its part too.
However, in the late 1980’s sightings of bears began to increase. A remarkable turn of events given the rarity of large animals naturally returning after extirpation. In this case, it apparently began with a black bear making the journey from the Sierra del Carmen Mountains in Northern Mexico, which is near the south-eastern border of the park. By the late 1990’s there were 343 annual sightings of black bears in Big Bend.
The story in the park today is one of managing interactions between people and wildlife. Like the main campgrounds I saw in Yosemite, the Big Bend campsite is an excellent example of the use of very strict regulations on food storage, waste disposal and water use to prevent negative interactions.
There are, however, some obvious differences between the parks as to the approach to managing the interactions. In Yosemite there is an active policy of chasing bears away to restore bears’ fear of humans. Throughout the main campgrounds one sees radio antennas fixed to the pines and which are used to track bears and alert the park rangers when a bear is approaching the campsites.
In Big Bend the situation is slightly different. According to the Camp Host at the Big Bend campsite, there are currently a few female bears bringing the cubs near or through the camp on most days. I was also told that the female bears and cubs actively forage during the day because rival male bears often kill the cubs at night. On a walk one morning this provided for a chance close encounter:
The Plight of the Condor
Californian condors once ranged from Canada to Mexico. About 10,000-15,000 years ago condors underwent a dramatic range reduction, coinciding with the extinction of many other large mammals in the Pleistocene (~2.6 million to 11.7 thousand years ago). When Europeans arrived in western North America condors were restricted to the Pacific coast from British Columbia to Baja California. Like the bears in Big Bend, condors were subjected to widespread anthropogenic control. They were also unintentionally poisoned by cyanide traps set for coyotes and after ingesting fragments of bullets in carcasses (left by humans) they were poisoned by the lead. From the talks I listened to at the Grand Canyon, lead poisoning still remains the greatest threat to the Californian condor today.
As a result of the persecution of condors by humans, by the late 1930’s there were apparently no condors outside of California. By 1982 the population was down to just 22 birds.
The dramatic decline of the condors sparked one of the worlds largest wildlife recovery efforts. This included captive breeding and staged releases. Puppets were used to feed the chicks while in captivity so that these remarkable birds would one day be able to survive again in the wild. There are now around 400 condors in the wild.
One thing that struck me of the story of the condor was the significance of volunteer effort and publicity to the rewilding project. Even today a team of volunteers in the canyon monitors condor chick activity every hour of daylight, every day of the year. As to publicity, integral to the long-term success of the reintroduction of the condor is the effort to reduce the risks of lead poisoning. That involves a widespread publicity campaign aimed at convincing hunters and land managers to replace lead bullets (which fragment on impact, splintering into hundreds of pieces) with copper ones that remain substantially intact on impact. For more details on lead and copper bullets see the video in the link below:
Though still rare and revered, condors are frequently seen in the Grand Canyon. At the time of my visit there was a chick in a cave that could be watched via telescope. The location of the cave in the canyon is shown below:
So what do these examples of rewilding add to the debate?
First, they represent the possibility for large predators, such as bears, to return to the landscape after a period of extirpation as long as the original threats are removed.
Second, that although called “rewilding”, the on-going threat to the viability of the projects remain not the dangers of the “wild”, but the ability of the project to manage successfully human and wildlife interactions. That is more about rethinking the “human” dimension as opposed to the “wild” one.
Third, with a little help from science, and a large bucket of funding, an iconic bird such as the condor can be assisted to recovery. If we take on the lessons about the amount of funding required, and also the enormous and invaluable contribution that can be made by harnessing the potential of volunteer assistance and wide-spread publicity, perhaps there is hope for the Tasmanian Devil after all?
Ps I also saw this elk quietly grazing in someone’s front yard!
Last week I attended The Wildlife Society annual conference in Milwaukee and the International Wolf Symposium in Duluth Minnesota.
The Wildlife Society: http://wildlifesociety.org/
The International Wolf Center: http://www.wolf.org/wolves/index.asp
The Wildlife Society conference had a diverse range of talks but of primary interest to me were the ones on wolves, trophic cascades and predator-prey interactions. There was much debate and discussion about the mechanisms that drive trophic cascades. There was generally more support for behaviourally mediated trophic cascades. This supports the “Ecology of Fear” concept. However, some presenters suggested a more complex explanation and that a range of additional factors could be involved.
For more on Trophic Cascades see the links below:
The International Wolf Symposium aimed to bring together researchers from all over the world working on wolves. The theme was Wolves and Humans at the Crossroads.
One of the key topics of debate was the de-listing of gray wolves from the List of Threatened and Endangered Species. Apparently we “agreed to disagree” based on the news piece below. From an outside view, I actually thought there was a lot of common ground.
Where’s Wally? I appear three times in the news piece below – see if you can spot me!
I also presented a talk titled: Reintroducing wolves: a chance for dingoes too?
Here is a copy of the abstract:
The reintroduction of wolves (Canis lupus) into Yellowstone National Park has sparked worldwide interest in reintroducing top-predators into areas where they have been locally extinct. This is supported by the theory that higher-order predators can alter the abundance or behavioural traits of their subordinate predators or prey, thereby enhancing the survival of the next lower trophic level. In Australia, the dingo (Canis lupus dingo), a subspecies of the wolf, is considered a top predator and potential trophic regulator. If dingoes suppress the European red fox (Vulpes vulpes) and feral cat (Felis catus), they would potentially enhance mammalian prey populations. Yet, there is considerable debate about whether or not dingoes are trophic regulators and whether anthropogenic changes could prevent dingoes from fulfilling their pre-European settlement roles. In this talk, I provide a historical overview of the ecological role of the dingo in Australia. In doing so, I review the evidence for and against maintaining the dingo in the ecosystem and provide an overview of the scientific basis for the controversial proposal to reintroduce dingoes back into areas where they are now locally extinct.
The main reason I started this ‘blog’ is to stay connected with the many people who helped me obtain a scholarship to work in the United States for 12 months.
The blog also provides a platform to provide updates about my project and work.
How did it all Begin?
It all started with an interest to find answers to an issue that has remained unresolved for decades: how to manage dingoes in Australia.
In particular, it is because scientists have begun to question the appropriateness of Australia’s historical management of dingoes. For example, it has been suggested that, under the right circumstances, if dingoes were reintroduced to areas where they are locally extinct (or uncommon) they would have a net positive effect on ecosystems.
Learning from Research in America
The reintroduction and predator ecology work being conducted in North America is an ideal scenario from which to learn. The current state of research in that area is far more advanced in comparison to anywhere else in the world. In particular, the reintroduction of wolves into Yellowstone National Park has been the subject of much scientific study.
The Fulbright Scholarship
In mid 2012 I started to contact potential collaborators to work with in America. I was primarily interested to work with groups who were studying the interactions between re-introduced top-order predators and co-occurring prey. The work has specific relevance to New South Wales where dingoes are a legislated pest and uncommon in areas due to extensive control, but where any proposals for reintroduction may have application.
What developed was a project proposal working with Professor William Ripple at Oregon State University and Assistant Professor Aaron Wirsing at the University of Washington.
In 2013 I was awarded a 12-month grant from the Australian American Fulbright Commission to undertake the project. The Fulbright scholarship aims to further mutual understanding between the people of Australia and the United States through educational and cultural exchange.
The scholarships were announced on the 21st March 2013.
Twenty-six scholarships across a range of disciplines were awarded:
The Work Begins
It is now September 2013.
I have arrived in America and the work has just begun.
This Webpage and Future Blogs
I have included some additional information about the project and my background under the tabs at the top of the page. Relevant links will be posted here as I go.
I look forward to sharing the adventures with you!