Rescuing Island Fox Data for the Future

When island foxes were dying on Santa Catalina Island in 1998, their bodies were sent to Dr. Linda Munsen at the University of California at Davis' School of Veterinary Medicine for evaluation. Dr. Munsen was the first to uncover canine distemper virus as the cause of island fox deaths across the island.

When island fox bodies were found on the northern islands with distinctive puncture wounds. This physical evidence of golden eagle predation was kept for future reference at UC Davis. The individual island foxes that fell prey to golden eagles also provide a genetic snapshot of a population before it plummeted toward extinction.

Checking fox ear canal during health check

From chronicling the rise of cancer in Santa Catalina Island foxes to documenting the threats from parasites and rodenticides, the island fox specimens collected at UC Davis provide data on generations of island foxes and represent generations of work done by researchers uncovering health threats to this rare California species. 

Island fox blood samples

Jump to 2026 and we have a historically valuable collection of island fox biological specimens. Unfortunately, after the retirement of pathologist Dr. Leslie Woods and the untimely death last year of Dr. Munsen's protégé, researcher Dr. Patty Gaffney, this record of island fox health no longer has a home.  

 

Coming together, the island land managers and island fox research community are acting quickly to save this valuable biological resource. Friends of the Island Fox and the Santa Barbara Zoo have summited grant applications to help pay for the transportation of frozen island fox samples to a new location and a -80 freezer to hold the specimens. Land managers are searching through stretched budgets for any available funds. Grants are still pending, but we have to move the specimens NOW.

It is a $20,000 initial endeavor to secure these specimens for future generations of researchers.

Stay tuned for updates. 

Fox Foto Friday - Creating a Living Library

 What's in these vials?

 

courtesy L. Brenner, TNC

Island fox blood samples going back decades. 

During annual health check-ups, samples are taken of island fox blood. Blood samples can be used to screen for increased antibodies to a specific virus, to check for toxins, or to provide genetic information.

 

 

These island fox blood samples from Santa Cruz Island are currently being archived and prepared for long-term cryogenic storage at the Museum of Southwestern Biology (MSB) at the University of New Mexico. 

For years, island fox samples have been housed in freezers spread across counties and agencies. While a collection of samples are stored at the School of Veterinary Medicine at UC Davis, samples from different islands have been stashed in a variety of locations with ever-changing safety measures or lack there of. The value of these specimens to science is degraded if they experience unreliable freezing, are not accessible, or are misplaced.

In 2023, FIF worked with the Dept. of Defense and the U.S. Navy to move some specimens from San Nicolas Island foxes to the Museum of Southwestern Biology (MSB), one of the largest and most advanced centers for archiving mammal specimens.

 

At the end of 2024, FIF assisted The Nature Conservancy with sending historic island fox blood samples from Santa Cruz Island to the MSB. The last group arrived in New Mexico March 26, 2025.

FIF's goal is to have scientific samples from all six islands archived, protected, and available to future researchers. 

 

Island foxes on San Miguel and Santa Rosa Islands have been through a historic genetic bottleneck; one that most geneticists considered impossible to recover from. Yet today, island foxes persevere. Island foxes can teach us about evolution, adaptation, and species sustainability. The information in this living library will provide future researchers with access to crucial data.

Donations to FIF help support important island fox research 

Apply for FIF's 2025 Research Grant 

Genetic research currently supported by Friends of the Island Fox:

• Transcriptomics in RNA and island fox health
• Comparing the genetics of the small founding populations on San Miguel and Santa Rosa Islands with today's island fox populations

Island Foxes on the Cover of Molecular Ecology

Fox Foto Friday - Island foxes make the cover of another scientific journal!

 

Friends of the Island Fox congratulates Jasmine Lu on the publication of her paper–"Ear mite infection restructures otic microbial networks in conservation–reliant Santa Catalina Island foxes (Urocyon littoralis catalinae)"–in Molecular Ecology. 

Working with Dr. Alexandra DeCandia, Lu investigated the connections between bacteria communities and ear mite infection to understand why island foxes on Catalina became so vulnerable to cancerous tumors in their ear canals.

When there's biodiversity in an island fox's microbiome, good bacteria can work together to keep harmful bacteria in check. When there is a lack of diversity, opportunistic pathogens, like Staphylococcus pseudintermedius can become the dominant bacteria in a fox's ear. In combination, ear mite infestation and S. pseudintermedius promote chronic inflammation. More on bacterial imbalance in island fox ear canal

Compounding the probability for serious disease, two strains of Staph bacteria appeared to cooperate in forming a "multistrain biofilm." As the bacterial community deteriorated, other carcinogenesis-promoting microbes rose in prevalence and assumed a keystone role in the microbiome. 

A video of Jasmine Lu discussing her work on "Date with a Fox" will be available soon.

Read the scientific paper

Why does the occurrence of ear mites in Catalina Island foxes initiate this bacterial imbalance? Other island foxes encounter ear mites, but a similar imbalance does not occur.

Those smudgy swabs collected from island fox ears during health checks continue to provide data to compare microbiomes between island foxes. 

Your donations helped to fund this important research for island foxes and the furtherance of scientific understanding of the potential role of bacteria in some cancers.