Kevin Crooks, Colorado State University and Rebecca Niemiec, Colorado State University

Hunting large carnivores is a contentious issue in wildlife management and conservation. It’s on the ballot in fall 2024 in Colorado, where voters will consider Proposition 127, a proposed ban on hunting and trapping of mountain lions, bobcats and lynx in the state.

Wildlife agencies often use regulated hunting as a tool for controlling carnivore populations, reducing their impacts on vulnerable wildlife or minimizing the risk of conflict between carnivores and people, pets and livestock. But scientific studies have questioned how effectively recreational hunting achieves these goals. And public attitudes are shifting as participation in hunting declines.

We direct Colorado State University’s Center for Human-Carnivore Coexistence and Animal-Human Policy Center. Together with our colleague Benjamin Ghasemi, we recently surveyed Colorado residents about their perceptions of hunting mountain lions and black bears in the state.

We found that support for hunting depended on the purpose, with most Coloradans disapproving of hunting for trophies or sport. Gender, age and other demographic factors also played roles.

Meet the neighbors

Mountain lions, also known as cougars or pumas, live primarily in the western U.S. and are legally hunted in all western states except California. Black bears, which live mainly in mountainous and forested regions across the continental U.S., are hunted in the majority of states in which they are found.

The Colorado Parks and Wildlife agency estimates that roughly 3,800 to 4,400 adult mountain lions and 17,000 to 20,000 black bears live in Colorado. They are found mainly in the Rocky Mountains, with the eastern edges of their ranges near more human-populated areas in the Front Range.

According to state data, hunters in Colorado killed 502 mountain lions during the 2022-2023 hunting season and 1,299 black bears during the 2023 season.

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Both species come into conflict with people in the state. The most common situation is when bears wander into mountain towns in search of garbage or other foods left by humans. Mountain lions are occasionally sighted in urban areas, and on rare occasions have attacked people. https://www.youtube.com/embed/-PCc77LZW_Y?wmode=transparent&start=0 Residents of Silverton, Colo., react after a mother bear that wandered into town in September 2024 was shot with a bean bag, intended as a nonlethal hazing method, and died.

Varying views of hunting

Our study gathered responses from Colorado residents through two public mail surveys. Samples were weighted to be representative of state population demographics, including age, gender, urbanization level, geographical region and participation in hunting.

Respondents’ views on legal and regulated hunting of mountain lions were evenly split, with 41% approving and 41% disapproving. This was also true for black bears: 46% approved of hunting them, and 46% disapproved.

Large majorities disapproved of hunting either animal for trophies, hide or fur, or for recreation. For mountain lions, 78% of respondents disapproved of trophy hunting; for black bears, 86% disapproved of trophy hunting. People also generally disapproved of hunting either species for meat.

Respondents were more supportive of hunts for other reasons. They approved of hunting mountain lions and black bears to protect human safety by 63% and 57%, respectively. And 56% approved of hunting mountain lions to reduce harm to livestock.

Large majorities disapproved of hunting mountain lions with dogs (88%) or recorded electronic calls (75%). Most mountain lions hunted in Colorado are legally taken with the aid of dogs, which chase and then tree or corner the cats. Using electronic calls to attract the cats was permitted in some parts of western Colorado until 2024, when the practice was banned for hunting mountain lions. It remains legal for hunting other carnivores, such as bobcats and coyotes.

Women, younger people, urban residents and people who identified as or leaned Democratic tended to be less supportive of hunting than men, older people, rural residents and Republicans. A study we published in 2022 on the reintroduction of wolves to Colorado found a similar political split, with stronger support for restoring wolves among people who identified as Democratic than among Republicans.

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How to coexist with carnivores?

Although Coloradans were generally supportive of using hunting to reduce human conflict with black bears and mountain lions, studies suggest that it might not be the most effective tool to do so.

For example, a recent experimental study in Ontario, Canada, concluded that increased hunting of black bears did not result in less conflict – particularly during years when the bear’s natural food sources, such as nuts and berries, were limited in the wild. A long-term study on bears in Durango, Colorado, also found that availability of natural foods in the wild, and the lure of human food within the city, were the main drivers of clashes with bears.

Conversely, another study in New Jersey – which is more densely developed than Colorado, so bears may be more likely to encounter people – found that well-regulated hunting of closely monitored black bear populations could help reduce conflict.

Similar to its policy with bears, Colorado uses hunting as a management tool for mountain lions. There is limited scientific evidence that hunting mountain lions may prevent conflict with them. A recent study found that juvenile mountain lions from a hunted site in Nevada tended to avoid developed areas. In contrast, young cats from a site in California without hunting did not show any preference for or against areas with people.

Yet, other correlative studies in Washington, California and Canada have suggested that hunting may make the problem worse. According to these researchers, hunting might disrupt the social dynamics and age structure of mountain lion populations, causing young cats seeking new territory to roam into populated areas, increasing their chances of encountering people.

Overall, we believe that more reliable scientific information is needed to guide carnivore management and test assumptions about how effective hunting is at addressing these problems. Continued focus on proactive, nonlethal strategies to prevent conflict is essential.

Ultimately, promoting coexistence between humans and carnivores is often much more about managing people than about managing predators. Changing human behavior is key.

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For example, failing to store garbage securely attracts bears. So does filling bird feeders in spring, summer and fall, when bears are active. Steps to reduce encounters with mountain lions include hiking in groups and making noise; keeping dogs leashed in the backcountry; keeping pets indoors at home; and not landscaping with plants that attract deer, the cat’s main prey.

Big cats on the ballot

Colorado’s Proposition 127 would ban hunting and trapping of mountain lions, bobcats and lynx in the state. It would allow for lethal removal of problem animals to protect human life, property and livestock.

Hunting and trapping of bobcats, mainly to sell their pelts in the fur trade, is currently legal in Colorado. On average, hunters and trappers have killed 880 bobcats annually over the past three years, the majority of which were trapped. Hunting and trapping are currently prohibited for lynx, which are listed as endangered in Colorado and threatened nationally, but the proposed ban would protect them if their populations recover.

Coloradans have voted to limit carnivore hunting in the past. They passed a ballot initiative in 1992 to ban bait, hounds and a spring hunting season for bears, and another in 1996 to ban the use of leghold traps, poison and snares.

Our research adds to growing evidence that public views toward hunting and carnivores are shifting. An increasing share of Americans believes humans should coexist with carnivores and opposes lethal control for human benefit. Studies also suggest that ballot measures like Proposition 127 may become more common as public attitudes evolve and more diverse groups seek to influence wildlife management.

It will be challenging for wildlife managers to adapt to these changing values. Agencies may have to consider more participatory methods that engage diverse stakeholders in decision-making, develop new funding mechanisms that are less reliant on hunting and fishing license fees, and reexamine how and for whom they manage wild animals.

This article has been updated with the current number of the Colorado ballot initiative on big cat hunting.

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Kevin Crooks, Professor of Fish, Wildlife, and Conservation Biology and Director, Center for Human-Carnivore Coexistence, Colorado State University and Rebecca Niemiec, Assistant Professor in the Human Dimensions of Natural Resources, Colorado State University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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Unleashing the Debate: Should Colorado Outlaw Mountain Lion Hunting?

Chantal Nguyen, University of Colorado Boulder

Most of us aren’t spending our days watching our houseplants grow. We see their signs of life only occasionally – a new leaf unfurled, a stem leaning toward the window.

But in the summer of 1863, Charles Darwin lay ill in bed, with nothing to do but watch his plants so closely that he could detect their small movements to and fro. The tendrils from his cucumber plants swept in circles until they encountered a stick, which they proceeded to twine around.

“I am getting very much amused by my tendrils,” he wrote.

This amusement blossomed into a decadeslong fascination with the little-noticed world of plant movements. He compiled his detailed observations and experiments in a 1880 book called “The Power of Movement in Plants.”

In one study, he traced the motion of a carnation leaf every few hours over the course of three days, revealing an irregular looping, jagged path. The swoops of cucumber tendrils and the zags of carnation leaves are examples of inherent, ubiquitous plant movements called circumnutations – from the Latin circum, meaning circle, and nutare, meaning to nod.

Circumnutations vary in size, regularity and timescale across plant species. But their exact function remains unclear.

I’m a physicist interested in understanding collective behavior in living systems. Like Darwin, I’m captivated by circumnutations, since they may underlie more complex phenomena in groups of plants.

Sunflower patterns

A 2017 study revealed a fascinating observation that got my colleagues and me wondering about the role circumnutations could play in plant growth patterns. In this study, researchers found that sunflowers grown in a dense row naturally formed a near-perfect zigzag pattern, with each plant leaning away from the row in alternating directions.

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This pattern allowed the plants to avoid shade from their neighbors and maximize their exposure to sunlight. These sunflowers flourished.

Researchers then planted some plants at the same density but constrained them so that they could grow only upright without leaning. These constrained plants produced less oil than the plants that could lean and get the maximum amount of sun.

While farmers can’t grow their sunflowers quite this close together due to the potential for disease spread, in the future they may be able to use these patterns to come up with new planting strategies.

Self-organization and randomness

This spontaneous pattern formation is a neat example of self-organization in nature. Self-organization refers to when initially disordered systems, such as a jungle of plants or a swarm of bees, achieve order without anything controlling them. Order emerges from the interactions between individual members of the system and their interactions with the environment.

Somewhat counterintuitively, noise – also called randomness – facilitates self-organization. Consider a colony of ants.

Ants secrete pheromones behind them as they crawl toward a food source. Other ants find this food source by following the pheromone trails, and they further reinforce the trail they took by secreting their own pheromones in turn. Over time, the ants converge on the best path to the food, and a single trail prevails.

But if a shorter path were to become possible, the ants would not necessarily find this path just by following the existing trail.

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If a few ants were to randomly deviate from the trail, though, they might stumble onto the shorter path and create a new trail. So this randomness injects a spontaneous change into the ants’ system that allows them to explore alternative scenarios.

Eventually, more ants would follow the new trail, and soon the shorter path would prevail. This randomness helps the ants adapt to changes in the environment, as a few ants spontaneously seek out more direct ways to their food source.

In biology, self-organized systems can be found at a range of scales, from the patterns of proteins inside cells to the socially complex colonies of honeybees that collectively build nests and forage for nectar.

Randomness in sunflower self-organization

So, could random, irregular circumnutations underpin the sunflowers’ self-organization?

My colleagues and I set out to explore this question by following the growth of young sunflowers we planted in the lab. Using cameras that imaged the plants every five minutes, we tracked the movement of the plants to see their circumnutatory paths.

We saw some loops and spirals, and lots of jagged movements. These ultimately appeared largely random, much like Darwin’s carnation. But when we placed the plants together in rows, they began to move away from one another, forming the same zigzag configurations that we’d seen in the previous study.

We analyzed the plants’ circumnutations and found that at any given time, the direction of the plant’s motion appeared completely independent of how it was moving about half an hour earlier. If you measured a plant’s motion once every 30 minutes, it would appear to be moving in a completely random way.

We also measured how much the plant’s leaves grew over the course of two weeks. By putting all of these results together, we sketched a picture of how a plant moved and grew on its own. This information allowed us to computationally model a sunflower and simulate how it behaves over the course of its growth.

A sunflower model

We modeled each plant simply as a circular crown on a stem, with the crown expanding according to the growth rate we measured experimentally. The simulated plant moved in a completely random way, taking a “step” every half hour.

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We created the model sunflowers with circumnutations of lower or higher intensity by tweaking the step sizes. At one end of the spectrum, sunflowers were much more likely to take tiny steps than big ones, leading to slow, minimal movement on average. At the other end were sunflowers that are equally as likely to take large steps as small steps, resulting in highly irregular movement. The real sunflowers we observed in our experiment were somewhere in the middle.

Plants require light to grow and have evolved the ability to detect shade and alter the direction of their growth in response.

We wanted our model sunflowers to do the same thing. So, we made it so that two plants that get too close to each other’s shade begin to lean away in opposite directions.

Finally, we wanted to see whether we could replicate the zigzag pattern we’d observed with the real sunflowers in our model.

First, we set the model sunflowers to make small circumnutations. Their shade avoidance responses pushed them away from each other, but that wasn’t enough to produce the zigzag – the model plants stayed stuck in a line. In physics, we would call this a “frustrated” system.

Then, we set the plants to make large circumnutations. The plants started moving in random patterns that often brought the plants closer together rather than farther apart. Again, no zigzag pattern like we’d seen in the field.

But when we set the model plants to make moderately large movements, similar to our experimental measurements, the plants could self-organize into a zigzag pattern that gave each sunflower optimal exposure to light.

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So, we showed that these random, irregular movements helped the plants explore their surroundings to find desirable arrangements that benefited their growth.

Plants are much more dynamic than people give them credit for. By taking the time to follow them, scientists and farmers can unlock their secrets and use plants’ movement to their advantage.

Chantal Nguyen, Postdoctoral Associate at the BioFrontiers Institute, University of Colorado Boulder

This article is republished from The Conversation under a Creative Commons license. Read the original article.

STM Daily News is a vibrant news blog dedicated to sharing the brighter side of human experiences. Emphasizing positive, uplifting stories, the site focuses on delivering inspiring, informative, and well-researched content. With a commitment to accurate, fair, and responsible journalism, STM Daily News aims to foster a community of readers passionate about positive change and engaged in meaningful conversations. Join the movement and explore stories that celebrate the positive impacts shaping our world.

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The world of pickleball never ceases to amaze, offering up transformative stories that span cultures, continents, and competitive spirits. “People of Pickleball,” the popular podcast hosted by Michael “Sleeves” Sliwa, gives listeners an insider’s peek into the lives and adventures of pickleball personalities. In the latest episode, Sleeves sits down with Daniel Gold, a player who shines bright in the National Pickleball League with the Austin Ignite.

From Wimbledon to Pickleball Glory

Daniel Gold might currently be lighting up the pickleball courts, but his journey began on the lush, iconic grass of Wimbledon. A former pro tennis player from the ’80s, Daniel didn’t just play any tennis; he had a stint as what he modestly refers to as “bad pro tennis.” However, his post-tennis career is anything but ordinary, having spent 35 years building entrepreneurial businesses across Europe and the USA.

A Life Lived Full and Fast

Daniel’s conversation with Sleeves explores more than just pickleball tactics. It delves into a life filled with ventures and adventures, highlighting his prolonged entrepreneurial career. This episode doesn’t just skim the surface but dives deep into what it means to transition completely from one competitive arena to another later in life, and what drives someone to keep pursuing new peaks.

Family, Fun Facts, and Elton John?

Aside from business and sports, Daniel Gold gives listeners a glimpse into his personal life. Married to his teenage sweetheart, Stephanie, and a father to three daughters, Daniel’s life off the court is as full and fascinating as his athletic endeavors. And if you’re in for a bit of a quirky twist, get a load of this—Elton John once dedicated the song “Daniel” to him in front of a crowd of 100,000 at the British National Stadium, a fun fact that makes for an amusing and delightful tidbit in this engaging conversation.

Pickleball and Beyond

In this episode, Daniel shares his experience with the Austin Ignite and what it’s like playing in the thriving National Pickleball League. The discussion also veers into the growing popularity of pickleball, how the sport is evolving, and why it appeals to former athletes like him. As pickleball continues to ascend in the sports world, stories like Daniel’s provide a personal touch to the broader narrative of this fast-growing sport.

An Episode Not to Miss

“People of Pickleball” is known for bringing forward stories that inspire, entertain, and inform. Michael Sleeves Sliwa, with his engaging style and insightful questions, makes sure that every episode, including this latest with Daniel Gold, is not just about pickleball but about the people who give the sport its heartbeat. Whether you’re a longtime fan, a pickleball player, or just someone who loves good storytelling, this episode is a must-listen.

Tune into the People of Pickleball Podcast to catch this fascinating episode with Daniel Gold. Discover the intersections of sports, entrepreneurship, and personal growth—all through the lens of pickleball.

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