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Posts Tagged: Lenya Quinn-Davidson

Why Homes Burn and Why I'm Reminding You

Reposted from the Fire Adapted Communities Learning Network blog


I was nine years old when my dad's family home burned in the Oakland Hills Fire. As a country kid from one of the most fire-prone counties in northern California, I was no stranger to wildfire. Still, I remember the shock of driving through his childhood neighborhood in the weeks after the fire, seeing nothing but the skeletal remains of vehicles and homes — so different than the forest fires that I was used to back in Trinity County.

Those images came back to me a few weeks ago when I gave a presentation at a workshop in Redwood Valley, California. That community, which is in Mendocino County, suffered a devastating wildfire in October, during the same week that fires were burning throughout Sonoma and Napa counties. During the Redwood Valley Fire, nine people were killed and more than 500 structures were destroyed. Now more fires are burning in southern California, and in some ways, it seems that the human connection — the loss of lives, the loss of homes — is the defining feature of this year's fire season in California.

Redwood Valley Fire damage

Redwood Valley Fire damage. “In some ways, it seems that the human connection — the loss of lives, the loss of homes — is the defining feature of this year's fire season in California.” Credit: Lenya Quinn-Davidson, Fire Adapted Communities Learning Network

One of my close colleagues at the University of California Cooperative Extension, Yana Valachovic, has no doubt felt the human implications of the 2017 fire season. Her phone has been ringing off the hook for months because of her expertise and experience in home ignitions and home survival: concepts that people are desperate to understand and implement in light of the ongoing losses throughout the state.

In some ways, the research on home survival during wildfire is intuitive; most people understand defensible space concepts and the basics of fuels management. But there are so many ways that most of us could do better — ways that are well illustrated by my own friends, colleagues and family.

Yana talks about how even she — someone who studies this topic — stores paper bags full of her kids' old schoolwork in her attic, right next to the vents. And if you read the literature on this topic, you know that vents represent a major vulnerability during wildfire. Most homes burn from the inside out, meaning that embers make their way into the home through vents and other crevices, and they then ignite fuels inside the house. Once embers infiltrate, it's hard to slow them down — hence the photos we often see of blackened homes surrounded by green trees and intact neighborhoods.

Screenshot of Vulnerability of Vents to Wind-Blown Embers report cover

Click on the image above to access Dr. Steve Quarles' new report, Vulnerability of Vents to Wind-Blown Embers

Current research supports the use of finer mesh vent screens (typically a second screen behind the outer screen), and/or temporary vent covers during wildfire events. There is an impressive amount of information available on home venting and fire, including the desired fineness of screen meshes, the use of ridge vents and the appropriateness of unvented attics (PDF, 213 MB). Much of this work comes from the Insurance Institute for Business and Home Safety (IBHS). Steve Quarles leads IBHS's fire-related research program and has published a number of papers on this topic, including a new report, Vulnerability of Vents to Wind-Blown Embers.

Homes can also burn from the outside in, thanks again, in large part, to embers. A few years ago, when a wildfire came within a half mile of my mom's house, I found her gutters packed with dry leaves. This is a classic problem, and one that I was surprised to see at my own mom's house. How did we let the gutters fill up like that, knowing what we know? Gutters full of debris, if ignited, will provide direct flame and ignition to the edge of the roof; if the roof is not adequately protected by metal flashing, or if the gutter is below the roof edge exposing the vulnerable roof sheathing, it can be difficult to keep fire from spreading from the gutter into the house. In 2010, when Quarles was with University of California, he co-authored a great publication that discusses rain gutters, vents, roofing, decks and other home vulnerabilities (PDF, 4.87 MB).

There is also a fair amount of research on features adjacent or attached to the home — features like decks, fences and landscaping (PDF, 416 KB). Still, on a recent trip to a research station in southwest Georgia (a place known for its fire science research and active fire management), I was surprised to see that the landscaping around every building had a thick mulching of longleaf pine needles — literally one of the most flammable types of leaf litter in the world. It looked great but wouldn't be particularly helpful if a fire came through. And IBHS wildfire demonstrations, like this one from 2011, have shown that mulches and other near-home landscaping can become serious points of weakness during wildfire. (I highly recommend checking out their video demonstrations if you haven't before; they have a lab where they actually burn down full-sized homes.)

Now I know that this information is likely old news to many of you; I hesitated to write about this topic because our readership is probably fairly fluent in the research on home ignitions and survival. But the images of Yana's attic full of well-cured paper, my mom's gutters full of leaves, and the pine needle mulch at the research station in Georgia reminded me that we all have more we can do — even if we're well-versed in how homes burn. Home hardening is, of course, only one facet of fire adaptation, but this year's fires reinforced the importance of all efforts at all scales, from the vent and the gutters to the community wildfire protection plan and the prescribed burn.

Posted on Tuesday, January 9, 2018 at 4:15 PM
  • Author: Lenya Quinn-Davidson

Landowners Take the Lead on Prescribed Fire in Humboldt County

Reposted from the Fire Adapted Community Learning Network blog

For many years, we at the University of California Cooperative Extension (UCCE) have fielded questions from landowners about using fire as a tool. Ranchers and forestland owners in Humboldt County have voiced interest in using fire to improve range resources, enhance wildlife habitat, reduce fuels, and beat back the trees and shrubs that are quickly engulfing their prairies and woodlands, but we have struggled to provide them with good options.

In recent history, CAL FIRE led the majority of burns on private lands in California. In the 1980s, their Vegetation Management Program (VMP) was responsible for 30,000–65,000 acres of controlled burning every year. In recent decades, however, those numbers have consistently fallen short of 10,000 acres a year — a drop in the bucket given the habitat and fuels issues that we face in California. CAL FIRE is currently revamping and reinvesting in the VMP, which is great news, but it's clear that other pathways are needed for landowners to reclaim fire as the important tool that it is. Last year, UCCE started looking into prescribed fire models from other parts of the country. We know that other regions have impressive burn programs that blow California out of the water, and in most of those places, they've been successful because landowners are doing the burning themselves — something that's almost unheard of in California.

Over the last year, we worked with private landowners in Humboldt County to plan and implement burns. In June, we burned a 19-acre grass unit on a ranch in eastern Humboldt County, treating a patch of invasive medusahead. This Halloween, we burned 140 acres of coastal rangeland invaded by shrubs and trees. For both of these burns, we hired a qualified burn boss to write the burn plan and direct the burn, but we staffed the burns entirely with volunteers, including volunteer fire department members, landowners, and other interested community members. This model of burning — where the landowners take the lead — is truly an exciting and novel development in California, and I believe it is the critical ingredient to burning at a meaningful scale.

Fire practitioner lighting a fire with the Pacific Ocean in the backgroun

“This model of burning — where the landowners take the lead — is truly an exciting and novel development in California, and I believe it is the critical ingredient to burning at a meaningful scale.” Credit: Lenya Quinn-Davidson, Fire Adapted Communities Learning Network


Posted on Friday, December 8, 2017 at 10:30 AM
  • Author: Lenya Quinn-Davidson

Science Tuesday: Toasted Ticks

Reposted from the Fire Adapted Community Learning Network Blog

I'm sure many of you are familiar with the kids' book “Going on a Bear Hunt.” The family in the book is on an adventure that takes them through rough terrain: a swirling, whirling snowstorm; a deep, dark forest; thick, oozy mud; long, wavy grass; and a narrow, gloomy cave. For readers, the suspense builds toward the cave, where a bear awaits in the darkness. But as someone who's done a lot of fieldwork, it's actually the long, wavy grass that makes my skin crawl. What about ticks?!

Two kids playing in tall grass

Credit: Modification of photo by Thomas Kohler shared via Flickr Creative Commons

On Sunday, my son and I made a site visit to a nearby burn unit. As I talked with the property manager about the burn, my toddler ran through the tall grass happily yelling “swishy swashy, swishy swashy” (a line from the book), and it got me thinking — not only about ticks, but about the interactions between ticks and prescribed fire. Ticks have been getting a fair amount of attention in the media lately, and many of the stories are saying that 2017 is going to be a particularly bad year for ticks and tick-borne illnesses. And it's not just Lyme disease that people are concerned about; ticks can cause other health complications, including an allergy to meat products (one of my favorite fire scientists actually has this!). Given the emergence of these novel complications, and the increasing incidence of tick-related diseases in general, it seems more important than ever to understand and explore the various tools we have for reducing tick populations.

To me, it seems intuitive that prescribed fire would be an effective way to impact tick populations. (Have you ever put a tick on top of a woodstove? Toasted ticks don't fare too well!) But there are ecological interactions that can complicate the effectiveness of prescribed fire for tick reduction, and treatment and study design can also have a strong influence on these types of research projects. Thus, it is no surprise that results regarding the relationship between ticks and prescribed fire have been quite variable over the years.

Most studies agree that tick populations are reduced immediately after a prescribed burn. For example, a paper by Stafford et al. (1998) showed that two spring burns in Connecticut reduced nymphal abundance of the blacklegged tick (which causes Lyme disease) by 74 and 97 percent in units with moderate and severe fire effects, respectively. However, by fall of that same year, the abundance of adult blacklegged ticks was no different in the burned areas than in the controls. Similarly, prescribed burning in tallgrass prairies in Kansas significantly reduced the abundance of the lone star tick (which is responsible for the meat allergy issue I referenced above, in addition to other diseases). However, this decline was only during the year of the burn, with no effect in units burned on longer intervals (Cully 1999). These and other papers (e.g., Drew et al. 1985) make it clear that prescribed fire affects tick populations, but results are strongly correlated with the time since burn and with the severity of the burn.

Other research demonstrates the importance of larger ecological interactions in determining post-fire tick populations. A study by Allan (2009), which took place in oak-hickory forests in the Missouri Ozarks, found that only two years after a burn, tick densities were six times higher in burned areas than in controls. In that study, improved forage in the burned areas caused disproportionate usage by white-tailed deer, which are an important carrier of the lone star tick and likely reintroduced them in high numbers to the recently burned areas.

White-tailed buck in grassland

White-tailed deer are a common carrier of ticks and can reintroduce them to recently burned areas. Credit: Scott Bauer, U.S. Department of Agriculture shared via Flickr Creative Commons

As a whole, these studies don't offer much clarity on the utility of prescribed fire for reducing tick populations — the results are so variable! But a more recent paper in PLOS ONE (Gleim et al. 2014) helps navigate and explain some of the scientific tensions in this collective body of work, and offers a more encouraging and comprehensive perspective on prescribed fire and ticks.

In this study, the authors focused on long-term prescribed burning programs in Georgia and Florida, and they accounted for a number of site conditions, including the burn regimes surrounding each study area. The study included 21 different sites across the region and involved monthly tick sampling, trail camera monitoring of tick hosts, weather measurements and vegetation surveys. In these ways, it is one of the most robust studies of tick-fire interactions to date. And the results are encouraging!

Firefighter carrying a drip torch through a forest in Florida. The relationship between ticks and prescribed fire can be quite variable.

Whether or not a controlled burn reduces tick populations depends on several variables. Credit: Susan Blake, USDA Forest Service shared via Flickr Creative Commons

Gleim and her colleagues found that ticks were much more prevalent in unburned controls, and their modeling efforts showed that total tick counts were related to a number of variables, including the long-term use of burning, season, litter cover and tree density (2014). Of particular note is their finding that adjacent burn regimes (burned or unburned) had a significant effect on post-burn tick populations, both in numbers and species. This may explain some of the variance in past studies, and it highlights the importance of considering the larger landscape management context and the importance of edge effects when assessing the effectiveness of prescribed fire projects. We know this to be true in the invasive plant context (e.g., Berleman et al. 2016), but it also appears to be true for ticks.

But perhaps the most important finding in Gleim et al. is that the effective control of tick populations depends on the long-term use of prescribed fire. I appreciate this point because all too often, studies are based on a single prescribed fire treatment, even though we know that in many cases, it is the fire regime — and not just the individual burn — that we are trying to understand through our research.

In any case, I've decided that the unit my son and I visited on Sunday probably wouldn't be a great candidate for a tick-focused burn. It's only about three acres in size, probably hasn't been burned in 100 years and is surrounded by fields of tall grass. (Luckily, tick reduction is not the goal of that burn.) However, I think there is potential for a great new kids' book: “Going on a Tick Hunt,” complete with a section on the long-term benefits of prescribed fire!


Allan, B. F. (2009). Influence of Prescribed Burns on the Abundance of Amblyomma americanum (Acari: Ixodidae) in the Missouri OzarksJournal of Medical Entomology46(5), 1030-1036.

Berleman, S. A., K. N. Suding, D. L. Fry, J. W. Bartolome and S. L. Stephens (2016). Prescribed Fire Effects on Population Dynamics of an Annual GrasslandRangeland Ecology and Management69(6), 423-429.

Cully Jr, J. F. (1999). Lone Star Tick Abundance, Fire and Bison Grazing in Tallgrass PrairieJournal of Range Management, 139-144.

Drew, M. L., Samuel, W. M., Lukiwski, G. M., and Willman, J. N. (1985). An Evaluation of Burning for Control of Winter Ticks, Dermacentor albipictus, in Central AlbertaJournal of Wildlife Diseases21(3), 313-315.

Gleim, E. R., Conner, L. M., Berghaus, R. D., Levin, M. L., Zemtsova, G. E., & Yabsley, M. J. (2014). The Phenology of Ticks and the Effects of Long-Term Prescribed Burning on Tick Population Dynamics in Southwestern Georgia and Northwestern FloridaPLOS ONE9(11), e112174.

Stafford III, K. C., Ward, J. S., & Magnarelli, L. A. (1998). Impact of Controlled Burns on the Abundance of Ixodes scapularis (Acari: Ixodidae)Journal of Medical Entomology35(4), 510-513.

Posted on Wednesday, July 26, 2017 at 11:36 AM
  • Author: Lenya Quinn-Davidson

Fire History is Human History

Reposted with permission from the Fire Adapted Communities Learning Network

I recently found myself venting about the idea of “nature.” The concept has always bothered me. There's an inherent separatism in it—an implicit line in the sand between humans and nature, where we can and should appreciate it, but we think we aren't really part of it.

I struggle with these ideas often in my work. I've had people question the naturalness of frequently burned landscapes if they know that humans had a role in ignitions—even if human ignitions extend thousands of years into the past. The dichotomy runs deep.

So it's always refreshing to see 

Credit: Lenya Quinn-Davidson, Fire Adapted Communities Learning Network

scientific reinforcement of what I know in my heart to be true: people are a part of the landscape—a very powerful part.

This is the theme of a recent paper by Alan Taylor, Valerie Trouet, Carl Skinner and Scott Stephens in the Proceedings of the National Academy of Sciences (PNAS). The paper looks at California's Sierra Nevada over the last 400 years, and it finds that socioecological change—human activity—has been the primary driver of changes in the region's fire regimes, more so even than climate.

The paper, which came out late last year, incorporates a unique blend of fire history and human history. The authors were able to reconstruct a 415-year fire record for the region using a combination of tree ring studies and 20th century data on annual area burned. From there, they calculated a “fire index” for every year since 1600—basically a metric that combines fire occurrence and extent, and tells us how much fire activity was going on during that time. Those indices were used to identify large-scale shifts in regional fire regimes, which the authors compared with patterns of human settlement and management, and with climate.

The authors identified four major fire regime periods since 1600, which they were able to link to patterns of human activity. The first regime shift occurred in 1776, triggering a 90-year period of enhanced fire activity. During that period, the mean fire index was almost twice what it had been before 1775. The paper shows that this regime shift was coincident with the timing of Native American contact with Spanish missionaries in the region, which occurred in 1769. It's not exactly intuitive, but the authors explain that the decimation of Native Americans—and a subsequent reduction in light burning—allowed for an increase in fuel continuity and wildfire activity during that period. This connection is further evidenced by the increased sensitivity of fire activity to climate—a relationship that was relatively weak when Native Americans were conducting widespread burning.

The second regime shift occurred in 1866, at which point fire activity dropped back to pre-1776 levels. The authors attribute this shift to major land use changes across the region—mostly associated with intensive livestock grazing, which denuded herbaceous vegetation and had notable effects on fuel continuity and fire spread. During this period, fire activity was also less sensitive to climate than it had been during the previous period because of a lack of fuels.

Credit: Lenya Quinn-Davidson, Fire Adapted Communities Learning Network. Hayfork, where Lenya grew up, has been an epicenter of fire activity in recent decades. It's also been the focus of fire history studies by Alan Taylor and Carl Skinner, who co-authored this new paper.

Credit: Lenya Quinn-Davidson, Fire Adapted Communities Learning Network. Hayfork, where Lenya grew up, has been an epicenter of fire activity in recent decades. It's also been the focus of fire history studies by Alan Taylor and Carl Skinner, who co-authored this new paper.

The third shift is the one we're all most familiar with: the beginning of the fire suppression era in the early 1900s. During the fire suppression period, in which we're still operating today, fire activity has been 4–8 times less than in any other period in recent history. Likewise, the fire-climate relationship has been weak for most of this period; the 20th century has shown increased warming trends, yet fire activity has largely been squelched by human activity. Only in recent decades have we seen a strengthening of that relationship, as a perfect storm of high fuel accumulations, longer fire seasons and drier conditions enables fires of unprecedented severity and size, appearing to override the moderating effects of human management.

My last statement should give us pause. Are we entering an era—perhaps a new fire regime period—where changes in climate are overwhelming our human capacity to influence our landscape? The work of Westerling and others (check out my first Science Tuesday blog from last February) would indicate that we're headed in that direction.

A graph of the fire history described above

Figure 2 from Taylor et al., 2016: “Regime shifts in time series (1600-2015 CE) of Sierra Nevada fire index, summer moisture (i.e., PDSI), and summer temperature (i.e., WANT). A switch to new regime (fire or climate) is shown by a vertical line … The number of tree-ring sites recording fires in each year for the 1600-1907 CE period shown by a dashed line. The fire regime periods are indicated by color shading: 1600-1775 CE (green), 1776-1865 CE (orange), 1866-1903 CE (blue), and 1904 CE to present (pink).”

But the really valuable thing about this new paper by Taylor et al. is that it gives us a larger context to work within. Yes, recent decades have had increased fire activity and increased sensitivity to climate—we've all seen it. But let's remember that our collective frame of reference is relatively short; for most of us, our vision of what's natural or normal in terms of fire comes from the mid to late 20thcentury—the height of our fire disconnect. This paper allows us to look back and see that the human relationship to fire is enduring and powerful, and that our biggest mistake in the last century has been to deny ourselves that intimacy—to value “nature” over nurture. History tells us that we should be able to buffer climate effects, but only if we actively engage at a grand scale. I think we're ready.


Taylor, A. H., Trouet, V., Skinner, C. N., & Stephens, S. (2016). Socioecological transitions trigger fire regime shifts and modulate fire–climate interactions in the Sierra Nevada, USA, 1600–2015 CE. Proceedings of the National Academy of Sciences, 201609775.

Posted on Tuesday, February 7, 2017 at 9:22 AM
  • Author: Lenya Quinn-Davidson

Women learn to burn and lead in fire management in Northern California Oct. 19-28

Reposted from the UCANR Green Blog
Retired U.S. Forest Service fire chief Jeanne Pincha-Tulley, second from right, is among the inspiring women leaders encouraging women to aspire to be wildland fire managers at the Women-in-Fire Prescribed Fire Training Exchange.

Workshop aims to spark women's ambition to become leaders in fire management

Shortly after her son was born, Jeanne Pincha-Tulley was promoted to fire chief of a national forest. For the first six months, she brought the baby to work.

“Most of my colleagues were men between 40 and 50. I was 31,” recalled Pincha-Tulley, who was the first woman to achieve the rank of U.S. Forest Service fire chief in California. “My second son was 6 weeks old and nursing. They had no idea what to do. They absolutely freaked out.”  

While great efforts are being made to recruit women into fire management, women hold only 10 percent of wildland fire positions and 7 percent of leadership roles. A new training focuses on grooming women to lead in fire management.

To encourage to women build stronger networks and pursue leadership roles in fire management, Pincha-Tulley, who retired in 2015 after 36 years with the U.S. Forest Service, will be speaking from experience on gender roles at the Women-in-Fire Prescribed Fire Training Exchange (WTREX) in Northern California. She will also serve as deputy incident commander for the event.

The training will provide a "supportive environment for women and men to understand and elevate the need for diversity in fire management—not only in numbers, but also in approach," said Lenya Quinn-Davidson. Photo by Larry Luckham)

WHO:  Participants from 12 states and four countries, including 38 women and six men, who work for federal and state agencies, non-governmental organizations, tribes and universities. Organizers include Pincha-Tulley, Lenya Quinn-Davidson, UC Cooperative Extension wildland fire advisor and director of the Northern California Prescribed Fire Council; and Amanda Stamper, The Nature Conservancy fire management officer in Oregon, among others. Guest speakers include Sarah McCaffrey, USDA Forest Service research social scientist; Johnny Stowe, forester/biologist/yoga teacher/fire manager of the South Carolina Department of Natural Resources; Gwen Sanchez, deputy fire chief for the Shasta-Trinity National Forest, and many more.

WHAT:  WTREX participants will serve in qualified and trainee firefighting positions to implement prescribed burns throughout the region. They will complete pre- and post-fire monitoring, train with equipment, practice fireline leadership skills and learn about local fire ecology and fire management.

WHERE: The training will take place in Trinity and Shasta counties. Sites include open prairies, oak woodlands, mixed-conifer forests and chaparral. Field trips will be made to areas burned in recent wildfires and to prescribed fire and fuels treatment project sites.

WHEN: Oct. 19-28, beginning in Hayfork, ending in Redding. Burning and other outdoor activities will depend on the weather.

DETAILS: The 12-day hands-on prescribed fire training, modeled after prescribed fire training events that take place across the country, will include beginners to seasoned professionals. The difference is that most of the participants are women.

“I'm excited for this event because it will transcend the usual TREX emphasis on cooperative burning and learning,” Lenya Quinn-Davidson, UC Cooperative Extension wildland fire advisor, who is part of the team organizing the event. “It will explicitly recognize and reinforce the importance of female perspective and leadership in fire management, and provide a supportive environment for women and men to understand and elevate the need for diversity in fire management—not only in numbers, but also in approach.”

Women hold only 10 percent of wildland fire positions and 7 percent of leadership roles.

Based at the Tahoe National Forest, Pincha-Tulley oversaw 1.6 million acres, including fire suppression, prescribed fire and aviation operations.

As the only woman among the 17 national Incident Commanders, Pincha-Tulley looked for allies and mentors. In 2005, the year she was promoted to Type 1 Incident Commander, she led her team to Mississippi to assist in the aftermath of Hurricane Katrina. She was essentially invisible to the Air Force generals and Navy admirals until she put general stars on her uniform. A NASA director, a man, coached her, saying, “Are you going to let them take over the meeting? You're their peer, make yourself one.” He proceeded to mentor her, based on NASA's training for women in management.

“When you look for those people who can help, you begin to attract them,” Pincha-Tulley said. One of the primary goals of the Women-in-Fire Prescribed Fire Training Exchange is to connect women who work in fire, providing them with new networking and mentoring opportunities.

WTREX is co-hosted by eight primary partners as well as additional collaborators. These include the Northern California Prescribed Fire Council, the Fire Learning Network, the Cultural Fire Management Council, the Watershed Research and Training Center, the Bureau of Land Management, the USDA Forest Service, the California Fire Science Consortium, University of California Cooperative Extension, and other collaborators.

WTREX is supported by Promoting Ecosystem Resiliency through Collaboration: Landscapes, Learning and Restoration, a cooperative agreement between The Nature Conservancy, USDA Forest Service and agencies of the Department of the Interior. 

Posted on Monday, October 17, 2016 at 4:23 PM
Tags: fire management (1), Lenya Quinn-Davidson (3), wildfire (37), wildland fire (1), Women (2)
Posted on Monday, October 24, 2016 at 9:34 AM
  • Author: Pamela Kan-Rice

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