Dr. Brian MIller

MTSU researchers document hellbender’s accelerating decline in Middle Tennessee

(Author’s note: I was aware of the hellbender before interviewing Brian Miller, but did not know the giant salamanders were present on the Highland Rim of Tennessee. Subsequent reading and interviews with other researchers, including Dr. Bill Sutton at Tennessee State University, Nashville, confirm Miller’s statements that hellbenders are vanishing from large portions of Tennessee, and Missouri. The healthy populations in portions of the Great Smoky Mountains and Cherokee National Forest may be an exception to a general trend toward extirpation and, ultimately, extinction).

Brian Miller has been researching hellbenders for decades. He serves on the faculty of Middle Tennessee State University where he teaches in the biology department and mentors younger researchers, many of whom publish their research.

He has even developed a digital “Guide to the Reptiles and Amphibians of Middle Tennessee.” The guide began more than 30 years ago as a dichotomous key for students in his vertebrate zoology class and now includes hundreds of photographs and exceeds 400 pages.

Dr. Miller researches the hellbenders of the Highland Rim, the upland that surrounds Nashville and the Great Basin. Populations of hellbenders in streams of this region are perhaps Tennessee’s most endangered.

QUESTION: I noticed that you specialize in herpetofauna. Most of the research listed on your faculty page is focused on amphibians, but with some papers on snakes. Can you comment about your research?

ANSWER: You are correct that amphibians are my primary research interest, particularly salamanders. However, I also have strong interests in reptiles, and my students and I have conducted research on various species of snakes and turtles.

When did you become interested in hellbenders?

Hellbenders have been of interest to me since I first encountered them while enrolled in a course on herpetology at the University of Missouri in 1977. I was fortunate that the professor of that course, Dean Metter, was involved with research on hellbenders and I began to assist with his research in 1978, in collaboration with Robert Wilkinson at Southwest Missouri State University in Springfield, Missouri.

Chris Petersen was working on his master’s degree with Dr. Wilkinson at that time and he matriculated to the University of Missouri a couple of years later to start on his Ph.D, which was also with hellbenders. Chris and I spent time in the field gathering data for his Ph.D. project until I moved to Washington State to work on my Ph.D.

I was hired into the biology department at Middle Tennessee State University in 1989 and began working with hellbenders in this state in 1990. At that time, I was able to locate populations in several rivers in Middle Tennessee, including a large population in the Collins River. I decided to concentrate my efforts on this population and one in the Buffalo River.

Of note, the population I worked with in the Collins River was dominated by large adults, whereas the population in the Buffalo River consisted of many age classes, including young individuals.

The Collins River situation was like what I was familiar with in Missouri and Arkansas populations. Unfortunately, by the early 2000s the population I was working with in the Collins River was gone; however, populations remain in the Buffalo River. My research with hellbenders during the past decade has been concentrated in streams in the Western Highland Rim.

Do you work with both subspecies, the Ozark, and the Eastern hellbender?

I worked with both subspecies while a student at the University of Missouri when assisting with projects in the Metter lab, but since I moved to Tennessee, I have worked only with Tennessee populations.

What do you perceive as the greatest threats to hellbender populations?

I am not certain why most populations of hellbenders are in decline rangewide, but suspect that habitat alteration, including sedimentation, and disease are involved in many if not all areas where declines are occurring. Lack of recruitment of young is a common theme of populations that decline. 

This photo was included in a TDEC report compiled March 11. It shows an excavated stream channel amid extensive grading work at 2306 Maryville Pike.  

Developer of Maryville Pike property in South Knox County faces multiple state, county citations over alleged sediment pollution

Put a lid on it: Rangers, cops targeting unsecured garbage loads to reduce roadside litter

Great Smoky Mountains National Park rangers and the Gatlinburg Police Department made 37 traffic stops targeting insufficiently contained garbage during an enforcement campaign on the Spur on March 28 and March 29.

Unsecured trash and debris blowing from vehicles is a major source of litter along the Spur, which is used by 10 million vehicles per year and is the most heavily traveled — and heavily littered — roadway in the national park.

Rangers and police officers issued 25 verbal warnings and 13 citations during the anti-litter patrols, according to a press release from the national park.

Officials said garbage hauled from rental properties and homes often blows out of trucks and other vehicles and is a major source of litter along the busy road, which runs five miles between Pigeon Forge and Gatlinburg.

“With increasing visitation trends and more use of park roads for business and recreation, we need everyone to do their part to keep our roads litter free,” Great Smoky Mountains National Park Superintendent Cassius Cash said in a park press release announcing the targeted patrols. “To protect our scenic values and wildlife, it is vital that we prevent trash from ever being discarded in a national park.” 

Law enforcement ensured the motorists hauling trash "were complying with Tennessee State Code 39-14-507, which states that any motor vehicle that transports litter, or any material likely to be blown off, is required to have the material either in an enclosed space or fully covered by a tarp," according to the park service. 

The amount of litter that has accompanied increased visitation is not just a national park concern.

“The city of Gatlinburg is very concerned about the litter issues in the area and is willing to work with the national park and coordinate efforts, such as this targeted enforcement event,” said Gatlinburg City Manager Cindy Cameron Ogle in the combined release. “Together we can all make a difference to help keep our area beautiful for everyone to enjoy.” 

Rangers and Gatlinburg police plan more such litter enforcement patrols throughout the year.

Ephemeral birds of lasting beauty dependent on Tennessee forest

Think azure. A male cerulean warbler is sky blue. And to see one, you have to climb to the tops of certain Appalachian ridges and look toward the wild blue. To see one is to see a bit of heaven in an eight-gram bird.

East Tennessee’s Royal Blue Unit is not named in honor of the cerulean warbler but it’s appropriate to think so. The land parcel is part of the North Cumberland Wildlife Management Area and is one of the few places — very few places — the sky-blue passerines still nest in North America. It is estimated that 80 percent of the remaining population nests in the Appalachians. 

The cerulean is the fastest declining migratory songbird in North America, said ornithologist David Aborn, an assistant professor of biology, geology and environmental science at UT Chattanooga. The Breeding Bird Survey estimates that cerulean warbler population declined by 70 percent between 1966 and 2008.

“The species is not in danger of imminent extinction, but is rare enough to warrant concern, and its future is not assured,” the U.S. Fish and Wildlife Service reported in 2020.

Currently a management goal of “no net loss” is in place. “Management programs can be instituted at the present time that do not require major changes in land-use practices, but do consider silviculture appropriate to producing habitat for the species,” the report concluded.

The American Bird Conservancy and ProAves Colombia purchased 500 acres of rural land identified as wintering sites for the migratory bird. The Cerulean Warbler Reserve is the first in Latin America set aside for a migrant bird. It’s a start. But the beautiful bird faces many challenges here and abroad.