A foxy conundrum: investigating the disappearing red foxes in Russia

by ZSL on

Families of red foxes have been disappearing from Kronotsky Nature Biosphere Reserve​ in Russia.

ZSL’s resident wildlife vet in the country, Misha Goncharuk, tells us about this animal mystery he is helping to investigate:

Micha and the team trekked for miles across Kamchatka Peninsula to investigate declining fox populations
Misha trekked across the Kamchatka Peninsula to investigate red fox declines

The Kamchatka Peninsula is one of the most picturesque places on Earth with its magnificent volcanoes, geysers, and absolutely wild, primal nature. It's somewhere I've always wanted to visit and now my dream has come true. 

For the last four years, the Russian Academy of Sciences (RAS) has been conducting a red fox behavioural study in Kronotsky Nature Biosphere Reserve. While the species is not endangered, observations during the last two years have shown a mysterious decrease in populations.

All seven of the previously studied families within the population have disappeared, causing understandable alarm within the Reserve’s administration.  

Could mass migration or infectious disease exposure be at play? Unfortunately nobody knows due to the short field seasons of this study, but that’s what I went to investigate. 

Kronotsky Reserve is, without a doubt, one of the most beautiful but inaccessible places in the world, meaning the only way to access the study site was by helicopter. 

Misha arrived to the UNESCO world heritage site by helicopter
Misha arrived at the reserve by helicopter
The Reserve, and the flora and fauna within, are under the protection of UNESCO as a World Heritage Site. UNESCO has a very limited number of conservation activities each year and in 2016 decided to help our country investigate why these foxes are vanishing from the site.

As a result, we decided to try and find out whether a disease pathogen is responsible for their disappearance by collecting and inspecting blood samples from red foxes in the area. 

A red fox spotted on a motion sensor camera inspecting the trap used for investigating their decline
A red fox spotted inspecting the trap used for investigating their decline

If a disease was the reason for the disappearance of foxes, the blood samples collected would show specific antibodies for said disease when analysed in the laboratory. 

The list of diseases of interest included rabies and canine distemper virus, to name but a few.

Staff from the RAS sought a wildlife veterinarian to help with fox-trapping and collecting samples. I was recommended to join the investigation as a veterinarian who has experience in scientific biomedical trapping of carnivores by my colleague and mutual friend Katya Blidchenko.

Micha taking blood samples from a red fox at the Biosphere reserve
Once Micha collected the samples the foxes were released back into the wild
Since ZSL has already been doing this type of work for years in Lazovsky State Nature Reserve, I was absolutely thrilled to accept this offer! I believe that this unique opportunity was a gift of fate as I left Primorsky Kray (where ZSL is based in Russia) for Kamchatka exactly on my birthday.

After arriving in the main city, Petropavlovsk-Kamchatsky, and once the weather had improved, I was transported by helicopter to Kronotsky Reserve.

The closest distance our helicopter could land to the trapping site was 70km away, so we had to trek for a further three days before reaching our destination. It was the most interesting field walk that I’ve ever done: magnificent volcanos, wild brown bears and generally the unbelievable nature of Kamchatka.  It was worth all of the hard hiking!

The spectacular view of Kronotsky Nature Biosphere Reserve
The spectacular scenery of the Kamchatka Peninsula
I worked closely with RAS scientist Anna Yachmennicova.  All of the foxes on the trapping site are known to her as she has observed them for a long time. Of these, there were six foxes (three breeding pairs) that we needed to capture.

Generally, trapping foxes is difficult because they are smart - but not in Kamchatka. Two of the foxes live near the main ranger station in the area and were sitting in our cages the next morning after traps were set and rigged up. First pair - success! All procedures were performed and all samples taken.

After that, we travelled to an area 30km away from ranger station by boat. These foxes near the ocean were much smarter. They entered our traps, but did not take the bait or trigger the trap door mechanism. 

Misha taking blood samples of a fox at the ranger station
Misha taking blood samples of a fox at the ranger station
We spent two weeks there and captured only one vixen (female fox) on our third and final try. 

In total, we captured three foxes in two different areas. Even this small number of animals can bring us closer to understanding the true reason for the population decline in red foxes in Kronotsky Biosphere Nature Reserve. 

I was very happy to see that despite political differences, people from different organizations from different countries are still able to find a compromise and work collaboratively on wildlife conservation!

Now, we are looking for a good laboratory to test our samples, hopefully we will have the results later this year. Watch this space for the results of the study.

Select a blog

Artefact of the month

Every month one of the pieces held in ZSL’s Library and at ZSL Whipsnade Zoo will feature here as Artefact of the month.

Asia Conservation Program

Get the latest on ZSL's conservation work in Asia.

B.U.G.S Blog

Find out more about life in our B.U.G.S exhibit

Remote Sensing in Ecology and Conservation

A new Open Access journal for research at the interface of remote sensing, ecology and conservation.

ZSL Shop

See the latest ranges, updates and special offers from our exciting new online shop.

Wild About Magazine

Excerpts from ZSL's award winning members' magazine.

ZSL London Zoo

A blog for lovers of ZSL London Zoo. Bringing you amazing animal facts and exclusive access to the world's scientific oldest zoo.

ZSL Whipsnade Zoo

Discover more about the UK's biggest zoo with our fun blog posts!

Discovery and Learning in the Field

Join the ZSL Discovery and Learning team as they venture out of the zoo and in to the wild.

Conservation

Catch up on our latest Conservation Blogs

Arts and Culture

Follow the latest news on ZSL’s Arts & Culture projects at ZSL London and Whipsnade Zoos, and ZSL’s conservation work through the lens of the Arts.

Elephantastic!

ZSL Whipsnade Zoo's elephant keepers give an insight into the daily goings on in the elephant barn.

Tiger conservation

Read about conservation of tigers in Asia.

Videographer Blog

One man is boldly going where no other ZSL videographer has gone before - the land of Mountain Chicken Frogs.

Wild Science

From the field, to the lab, catch up with the scientists on the cutting edge of conservation biology at ZSL’s Institute of Zoology.

Wildlife Wood Project Cameroon

The Wildlife Wood Project has been working in Cameroon since 2007 to encourage better wildlife management in logging concessions.

Penguin expedition blog

Updates from penguin conservation expeditions to Antarctica

Amur Leopard

Amur leopard conservation blog

Baby Giraffe Diaries

Meet ZSL Whipsnade Zoo's latest (and leggiest) arrival, a baby giraffe!

Biodiversity and Palm Oil

Follow the ZSL Biodiversity and Palm Oil team, based in Bogor, Indonesia.

Chagos Expedition

The Chagos marine reserve, designated in 2010 and currently the world’s largest no take marine reserve, is a sought-after spot for marine research.

Science

Science blogs

Tsaobis Baboon Blog

Follow ZSL conservationists studying desert baboons in Namibia.