Congratulations to Brashares lab member Dave Kurz on his graduate symposium spotlight! Check out the summary of Dave’s recent work on bearded pig distributions amidst socio-cultural and environmental changes in Borneo as well as highlights from his many other academic and non-academic contributions!
Wildlife conservation work on the ground often leads us to the realization that conservation challenges – and solutions – are deeply embedded in human cultural beliefs, traditions, and values. This has certainly been my experience over the course of my PhD field work, which has led me from tracking threatened bearded pigs in the rainforest to working with the communities that have co-existed with this species for thousands of years.
This past summer, I had the privilege of returning to Sabah, Malaysian Borneo to meet and interview local pig hunters from the Kadazandusun-Murut community. Alongside my very capable interview team colleagues on the ground, Jordan Bloem from UC Berkeley and Vanielie Terrence Justine Tamin of the Universiti Malaysia Sabah, we asked local hunters about their hunting motivations, methods, histories, and futures. The hunters and their communities were extremely friendly and gracious to share their fascinating stories with us. We are currently analyzing the qualitative and quantitative data from this work, and hope to have some exciting updates soon!
- This fieldwork update was contributed by Dave Kurz, PhD Candidate in the Brashares Group.
In this recent talk, Phoebe Parker-Shames, PhD Candidate in the Brashares Lab, presents preliminary results on the influence of cannabis farms on wildlife, to a gathering of the University of California, Berkeley Cannabis Research Center affiliates. The group’s mission is to promote interdisciplinary scholarship on the social and environmental dimensions of cannabis production through scientific research and engagement with community, government, and academic entities.
Hydropower is a renewable resource, but that does not make it sustainable. In this TEDx talk, PhD Student and Brashares Lab Group member, Jessie Moravek shares more about the downsides to river hydropower, such as declining fish populations, poor water quality and damaged ecosystems. Jessie’s research focuses on the ecosystem effects of hydropower development in countries like Nepal, where freshwater biodiversity is under-studied and the hydropower industry is growing. This talk was given at a TEDx event using the TED conference format but independently organized by a local community.
By Christine Wilkinson, PhD Candidate
–Update from the Field–
Multidisciplinary work can be both difficult and exciting. With the support of National Geographic, for the past six months I’ve been in the field trying to gain a nuanced understanding of human-carnivore conflict and carnivore movement in areas surrounding Lake Nakuru National Park and Soysambu Conservancy in Kenya.
This project is different from anything I’ve done previously because of how much it crosses disciplines. The field work has several parts, including 1) community participatory mapping and interviews about risk perception, land use, and carnivore attacks on livestock, 2) camera trapping to determine carnivore movement across the fence that surrounds the national park, 3) mapping historical carnivore-livestock conflict reports, and 4) GPS collaring of spotted hyena-a species highly implicated in predation on livestock. My research is guided by the idea of creating multidisciplinary maps and spatial analyses to holistically understand and describe carnivore-livestock conflict and inform management.
Elevating the voices of people who routinely deal with conflict is worth it
As an ecologist and wildlife biologist by background, jumping into participatory work with communities has been by far the most challenging part of the project. The ecological methods come much more naturally to me. However, I believe that bringing communities into the process as fellow researchers and elevating the voices of people who routinely deal with conflict is worth it. Along with ecological research on the conflict, working with communities can create a powerful and encompassing story that can be more impactful for future management. So far, the community members seem to feel the same!
How close do you live to the wildlife around you? No matter if you live in an urban area or a rural one, it can be surprising to find out how closely we share our world with other animals.
As part of my dissertation research, I’ve been collecting motion-triggered wildlife photos in Southern Oregon. One night, after I collected the latest round of cameras, I sat down to share the photos with the people who let me set them on their land. We came to one series of photos that got everyone excited.
Photo 1: A golf cart with kids coming back from the river. “That’s me!” someone exclaimed. Photo 2: Nine minutes later, a black bear, sniffing its way along the same path.
We gasped and laughed as we realized how close the animals are with whom we share space. On that same camera we saw deer, turkeys, coyotes, rabbits, all sharing space with people and our horses, dogs, golf carts and bicycles. Seeing these photos gives me hope for our ability to coexist, but it also makes it clear that when we live in such close proximity, our actions can have large consequences on the world around us.
One of the latest manifestations of this potential impact comes from the increase of cannabis production in rural Southern Oregon and Northern California. While there are many anecdotes of cannabis’ negative impact, and certainly if you talk with locals they make it clear that the industry has changed surrounding landscapes, there are no data on these changes-leaving a big unknown in a rapidly growing industry.
Seeing these photos gives me hope for our ability to coexist, but it also makes it clear that … our actions can have large consequences on the world around us.
To address some of these unknowns, my research involves mapping cannabis production over time from Google Earth images. I combine these maps with wildlife monitoring data that I collect in partnership with land owners and cannabis farmers, and experimental trials to look at mechanisms of indirect impact on animal communities. The focus of the work is to understand and project the effects of the cannabis industry on wildlife in order to inform sustainable agricultural practices, policy and management decisions, and our understanding of how rural development shapes of wildlife occupancy and activity patterns.
Why study cannabis? Studying cannabis is important if we want policies and land use decisions that are informed by science. Unfortunately, because of cannabis’ federal illegal status as a Schedule I drug, there has been very little research on its effects on the environment. Despite rumors of a collapsing industry, cannabis seems to be here to stay, so researching the effects of the industry provides an opportunity to inform its future trajectory and gives us the power as a community to decide what we want that market to look like. This opportunity is rare and at an exciting formative moment.
It is also important to study cannabis because it is a unique crop. The policies, culture, and history surrounding cannabis, far more than any qualities of the plant itself, have shaped the ways in which it is grown so that it stands apart as both more industrialized in practice and more parceled into many smaller farms. Landscape ecology has traditionally focused on heavily degraded or fragmented habitats; rarely do we get to study impacts in an emerging industry while it is still a point source disturbance.
Finally, I have a personal interest in studying the cannabis industry in Southern Oregon, since it’s where I’m from. I wanted to research a topic where I had a chance to make conservation recommendations in a place that has meaning for me.
In order to study the effects of cannabis on wildlife, the Google Earth imagery will map the extent and expansion of outdoor and greenhouse cultivation. The data from the motion-triggered wildlife camera traps will monitor animal activity at different distances from cannabis cultivation. I will soon add small mammal traps and acoustic monitors to this data collection procedure, and begin experimental trials testing the effects of light and noise on animal occupancy. The success of this research hinges on partnerships with farms like East Fork Cultivars, as well as other producers on private lands that are not part of the legalized system. A main goal of mine is to work with the community and farmers themselves.
The success of this research hinges on partnerships with farms … [and] other producers on private lands that are not part of the legalized system.
While I am genuinely unsure of what most of my research will reveal, I have several expected results or hypotheses that inform my questions. Here are a few of them:
For the mapping data, I expect that production will increase after legalization and then level off, and that production will be clustered around areas that were under cultivation before legalization (essentially infilling around those areas). I expect that different wildlife species will respond differently to cannabis production, thereby creating novel groups of animals around cannabis farms that are different from what we would see in the surrounding landscape. I also except that the behavior of wildlife will shift in response to light and sound disturbance, creating more nocturnal wildlife communities.
I plan to combine the mapping data and wildlife responses to project the potential impact of the cannabis industry under different development scenarios. Above all, I hope I can help increase our understanding of the ways in which we too are part of the ecological systems around us, and use that knowledge to shape a more sustainable and equitable future.
If any of this sounds interesting, please contact Phoebe (firstname.lastname@example.org). She is looking for more cannabis farms in Southern Oregon and Northern California to participate. It’s a great way to find out what animals are present on your land, and it can be fulfilling to participate in local research targeted to your needs. Policy is already being made on this topic without data, so this is a new opportunity to engage in research that can inform decision-making.
By Kendall Calhoun, PhD Student
Fanning Flames over California
Mentioning you’re from California while abroad often leads to a handful of follow-up questions. Most of them revolving around the beach or Disneyland, both of which I rarely get to go to (unfortunately!). Most recently, however, California has become infamous worldwide for an increasingly urgent problem; wildfire. The impacts of recent severe fires have affected nearly every person/family within the state in some shape or form, as well as garnered the attentive eyes of countless others around the world. Native wildlife and landscapes also lay within a tenuous balance as encroaching megafires threaten to upend the natural stability established in these systems. Most ecosystems within California are fire-adapted, echoing back to deep co-evolutionary relationships between ecological communities and indigenous people who used fire to maintain important processes. However, recent global changes in climate, expanding urban development into wildland spaces and outdated policies in forest/fire management have created a perilous opportunity for many wildfires to transform into the immense megafires we’ve witnessed. The 2014 King Fire, 2017 Thomas Fire, and most recently the 2018 Mendocino Complex Fire (now the largest fire in recorded California history) are all examples of this process.
Megafires serve both as a threat to the balance of stability…and an opportunity to explore how the mechanisms of resilience work.
Arriving at grad school, my initial research curiosity pointed me towards exploring how biodiversity and community ecology contribute to maintaining the stability and resilience of the natural systems surrounding us. Megafires serve both as a threat to the balance of stability in many of these systems and as an opportunity to explore how the mechanisms of resilience work within human-altered ecological communities. California, renowned for its unique biodiversity, is covered in a myriad of habitat types and fire regimes. This past summer, I visited potential field sites to see what the current condition of wildfire means for the people, wildlife and future landscapes of California.
Yosemite: Illilouette Creek Basin
My first stop was the iconic landscape of Yosemite, tucked into the western slopes of the Sierra Nevada. I accompanied a collaboration of fire and wildlife ecologists from both UC Berkeley and UC Davis into the beautiful Illilouette Basin. This past fall (2017) a managed wildfire burned through an experimental plot established by the Stephens Lab at UC Berkeley. Charred black soot lined the steep path down to the basin and into our field site. The skeletal remains of short shrubs and hollowed trees remain as a reminder of recent events. In spite of this and unsure of what to expect, I was amazed to see the surprising amount of wildlife bustling through the area. Pairs of Mountain Bluebirds busily utilize the burned vacancies inside tress as they craft nests. Larger mammals, like deer and bears, also comb through the burned area.
This seemingly otherworldly landscape is more alive and vibrant than most would expect, an important reminder that fire isn’t a foreign phenomenon in these habitats and is intimately tied to existing natural processes. This fire in the Illilouette Basin is an important example of successful managed forest fire in action.
I was amazed to see the surprising amount of wildlife bustling through the area.
Naturally occurring fire was allowed to burn within certain parameters to parallel burnings of the forest in the past. The plan to move away from total forest fire suppression will hopefully promote a healthier and more diverse forest ecosystem.
Hopland: Hopland Research and Extension Center
My second stop on this trip was the Hopland Research and Extension Center (HREC), just off Highway 101 in Mendocino county. This initial trip was used to launch a pilot project exploring how managed burning as well as fencing may affect the abundance and diversity of rodent species on within human-altered landscapes. In the advent of this past summer’s River fire, part of the larger Mendocino Complex Fire, my current research direction has shifted towards assessing how the composition and movement of Hopland’s wildlife community responds post-fire. This also provides a critical
opportunity to assess methods of fire and land management for the grassland, chaparral, and woodland habitats common near the coast of California. These habitat types have been the source of some of the largest and most costly fires in recent California history, and come with their own management challenges unique from forest fires.
Over the upcoming year, I hope to establish an extensive biodiversity monitoring system to assess how many groups of species (large and small mammals, birds, and bats) respond to sudden fire disturbance over time. Potential projects here could elucidate better strategies in dealing with California brush fires as well as how best to support wildlife in these working landscapes that serve as an interface between humans and wildlife.
By Kaitlyn Gaynor, PhD Candidate
For their first 100 million years on planet Earth, our mammal ancestors relied on the cover of darkness to escape their dinosaur predators and competitors. Only after the meteor-induced mass extinction of dinosaurs 66 million years ago could these nocturnal mammals explore the many wondrous opportunities available in the light of day.
Fast forward to the present, and the honeymoon in the sun may be over for mammals. They’re increasingly returning to the protection of night to avoid the Earth’s current terrifying super-predator: Homo sapiens.
My colleagues and I have made the first effort to measure the global effects of human disturbance on the daily activity patterns of wildlife. In our new study in the journal Science, we documented a powerful and widespread process by which mammals alter their behavior alongside people: Human disturbance is creating a more nocturnal natural world.
Many catastrophic effects of humans on wildlife communities have been well-documented: We are responsible for habitat destruction and overexploitation that have imperiled animal populations around the world. However, just our presence alone can have important behavioral impacts on wildlife, even if these effects aren’t immediately apparent or easy to quantify. Many animals fear humans: We can be large, noisy, novel and dangerous. Animals often go out of their way to avoid encountering us. But it’s becoming more and more challenging for wildlife to seek out human-free spaces, as the human population grows and our footprint expands across the planet.
Global increase in nocturnality
My collaborators and I noticed a striking pattern in some of our own data from research in Tanzania, Nepal and Canada: animals from impala to tigers to grizzly bears seemed to be more active at night when they were around people. Once the idea was on our radar, we began to see it throughout the published scientific literature.
It appeared to be a common global phenomenon; we set out to see just how widespread this effect was. Might animals all over the world be adjusting their daily activity patterns to avoid humans in time, given that it is becoming harder to avoid us in space?
To explore this question, we conducted a meta-analysis, or a study of studies. We systematically scoured the published literature for peer-reviewed journal articles, reports and theses that documented the 24-hour activity patterns of large mammals. We focused on mammals because their need for plenty of space often brings them into contact with humans, and they possess traits that allow for some flexibility in their activity.
We needed to find examples that provided data for areas or seasons of low human disturbance – that is, more natural conditions – and high human disturbance. For example, studies compared deer activity in and out of the hunting season, grizzly bear activity in areas with and without hiking, and elephant activity inside protected areas and outside among rural settlement.
Based on reported data from remote camera traps, radio collars or observations, we determined each species’ nocturnality, which we defined as the percentage of the animal’s total activity that occurred between sunset and sunrise. We then quantified the difference in nocturnality between low and high disturbance to understand how animals changed their activity patterns in response to people.
Overall, for the 62 species in our study, mammals were 1.36 times as nocturnal in response to human disturbance. An animal that naturally split its activity evenly between the day and night, for example, would increase its nighttime activity to 68 percent around people.
While we expected to find a trend toward increased wildlife nocturnality around people, we were surprised by the consistency of the results around the world. Eighty-three percent of the case studies we examined showed some increase in nocturnal activity in response to disturbance. Our finding was consistent across species, continents and habitat types. Antelope on the savanna of Zimbabwe, tapir in the Ecuadorian rainforests, bobcats in the American southwest deserts – all seemed to be doing what they could to shift their activity to the cover of darkness.
Perhaps most surprisingly, the pattern also held across different types of human disturbance, including activities such as hunting, hiking, mountain biking, and infrastructure such as roads, residential settlement and agriculture. Animals responded strongly to all activities, regardless of whether people actually posed a direct threat. It seems human presence alone is enough to disrupt their natural patterns of behavior. People may think our outdoor recreation leaves no trace, but our mere presence can have lasting consequences.
Future of human-wildlife coexistence
We don’t yet understand the consequences of this dramatic behavioral shift for individual animals or populations. Over millions of years, many of the animals included in our study have evolved adaptations to living in the daylight.
Sun bears, for example, are typically diurnal and sun-loving creatures; in undisturbed areas less than 20 percent of their activity occurred at the night. But they increased their nocturnality to 90 percent in areas of the Sumatran forest where intensive forest research activity created a disturbance.
Such diurnally adapted animals may not be as successful at finding food, avoiding predators or communicating in the darkness, which could even reduce their survival or reproduction.
However, because our mammalian ancestors evolved under the cover of darkness in the time of the dinosaurs, most mammal species possess traits that allow for some flexibility in their activity patterns. As long as animals are able to meet their needs during the night, they may actually thrive in human-dominated landscapes by avoiding daytime direct encounters with people that could potentially be dangerous for both parties. In Nepal, for example, tigers and people share the exact same trails in the forest at different times of day, reducing direct conflict between humans and these large carnivores. Dividing up the day, through what researchers call temporal partitioning, may be a mechanism by which people and wildlife can coexist on an ever more crowded planet.
An increase in nocturnality among certain species may also have far-reaching consequences for ecosystems, reshaping species interactions and cascading through food webs. In California’s Santa Cruz Mountains, coyotes are becoming more nocturnal in areas with human recreation. By analyzing coyote scat, scientists have linked this behavioral change to dietary shifts from diurnal to nocturnal prey, with implications for small mammal communities and for competition with other predators.
Working on this study reminded me that people aren’t alone on the planet. Even if we don’t see large mammals while we’re out and about during the day, they may still be living alongside us, asleep while we are awake and vice versa. In areas where threatened species live, managers may consider restricting human activity to certain times of the day, leaving some daylight just for wildlife.
And it is likely that we need to preserve wilderness areas entirely free of human disturbance to conserve the most vulnerable and sensitive mammal species. Not all animals are willing or able to just switch to a nocturnal lifestyle around people. Those that try to avoid human disturbance entirely may be most vulnerable to the consequences of the expanding human footprint.