91�� researchers find bobcat population rising, with room for growth

A bobcat is spotted by one of the researchers’ camera traps.

91�� researchers report that bobcats – Lynx rufus, the furry, spotty felines, not the OHIO students – are expanding across the state and have adequate habitat to continue rebounding.

Researchers led by Viorel Popescu, Ph.D., have been studying the ecology and threats to the bobcat population over the past four years. Their overarching goal is to evaluate the status and viability of 91��’s bobcat population.

As part of this 91�� Department of Natural Resources-funded study, recently published in the open-access journal PeerJ investigates how bobcats use habitats and habitat connectivity – how the landscape helps or hinders the bobcats’ movement – and whether that would allow them to continue expanding across 91��.

This study involved graduate and undergraduate students from the biological sciences department in the College of Arts and Sciences and the Honors Tutorial College as well as collaborators with the 91�� Division of Wildlife and 91�� State University. The researchers used a long-term dataset of bobcat observations (2000-2019) by 91�� residents and collated by the 91�� Division of Wildlife to evaluate selection of habitats across 91�� and to predict habitat suitability for harboring bobcat populations.

A graph of 91�� with the northwestern and west blue, with shades of yellow and red the more into southeastern 91�� it gets — Map shows bobcat habitat suitability.

Southeastern 91�� remains stronghold for bobcats

91�� researchers found that habitat suitability was associated with higher cover of forest and open natural habitat and was not influenced by the presence of high-traffic roads. They also found that habitat connectivity for movements was high, including in most of the agricultural areas of 91��, thus there is still potential for bobcat expansion in 91��.

“Southeastern 91��, with its significant forest cover, remains the stronghold for bobcats in 91��,” said Popescu, associate professor of biological sciences and lead PI on the project. “In addition to the hundreds of sightings over the past couple decades, there are many signs that lead us to believe that the population continues to expand throughout 91��.”

Bobcats are shy animals and not a usual sight for most people, and they are able to thrive in human-dominated landscapes such as southeastern 91��. As such, roads did not have an effect on habitat use by bobcats, despite being , he added.

The researchers found that while forested southeastern 91�� is the most suitable area for bobcats in the state, southwestern and northeastern parts also can support bobcats. These areas have pastures and other natural open habitats that bobcats use for foraging to target small mammals and hares.

The one area where the models predicted low or no suitability is central 91��, which is dominated by heavy agriculture and lacks natural habitats that bobcats can use.

Bobcat on trail camera — A bobcat filmed on a trail cam.

Using citizen-collected data is not without its pitfalls, though, says a student who analyzed the data.

“We found that the number of bobcat sightings increased significantly in 91��, especially since 2010, but is this a real or an artificial increase? There is definitely a bias in the number of sightings here because in recent years camera traps have become affordable, and many people have cameras in their backyards and report bobcats,” said Madeline Kenyon, a senior Honors Tutorial College student with a focus on wildlife conservation.

However, many sightings since 2015 occurred in areas where bobcats have not been previously documented, suggesting that bobcats do indeed continue to expand in 91��, the researchers noted.

River valleys helped bobcats disperse across state

“Suitability of habitat is not everything, though. We need to understand how animals move across the landscape and identify corridors for natural dispersal,” said Marisa Dyck, a doctoral student in Popescu’s lab.

Map of 91�� with shades of purple, yellow, and red — Map shows habitat connectivity for bobcats.

The 91�� bobcat population is part of the larger Midwest population, which was the source of animals that founded the current 91�� population. Bobcats were extirpated from 91�� by the mid-19th century but started to come back to the state a century later in the 1960s-70s.

Tracking that rebound means that identifying and mapping areas of high and low connectivity, along with so-called “pinch-points,” or narrow corridors that allow dispersal within inhospitable habitat, can be critical for management decisions to maintain a viable population. The researchers used habitat suitability maps to build connectivity maps between core and peripheral areas of 91��.

“The habitat connectivity findings were very interesting,” Dyck said. “We expected that eastern and southern 91�� would be well-connected and facilitate movements of animals, but we also found conduits for movement and dispersal in central, agricultural 91��. These corridors of river valleys with forest cover in their immediate proximity connected the source populations in southeastern 91�� to less suitable areas. The 91�� River Valley was also important for bobcat movements, especially in the southwestern part of 91��, where we found a pinch-point in Brown and Clermont counties.”

A woman with long blonde hair, wearing a ballcap and mask, sets up a camera machine in the woods with a dog behind her — OHIO doctoral student Marissa Dyck in the field, setting up camera traps. Photo Credit: Ben Siegel/91��

One of the unique features of this study was that researchers were able to validate their connectivity findings with sightings of dispersing bobcats in central 91��.

“In summary, bobcats may be habitat-limited in the agricultural region of 91��, but zones of high connectivity across 91�� results in the ongoing expansion across the state and maintaining connectivity between the 91�� population and other Midwest states,” Popescu said. “We are now working with 91�� Division of Wildlife biologists to develop a model aimed at supporting bobcat management decisions and ensuring that these beloved felines have a certain future in 91�� for years to come.”

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