For decades, they swam alongside their cousins, largely unnoticed. Now, thanks to advances in genetic analysis, two distinct species of black bass—Bartram’s bass and Altamaha bass—are officially recognized, a discovery that highlights the hidden biodiversity within seemingly well-known ecosystems. The findings, published recently in the journal Zootaxa, underscore the importance of modern DNA sequencing in uncovering the intricacies of the natural world and the urgent need for conservation efforts as these species face increasing threats.
The story of these newly identified bass isn’t one of sudden revelation, but of decades-long observation and, confirmation through scientific rigor. Ecologist Bud Freeman first encountered what he suspected was a unique fish in the 1980s while visiting the Broad River in South Carolina. A local couple, having caught an unusual bass, offered him the specimen for $5, but ultimately decided to keep it for dinner. “That would have been an important specimen,” Freeman, now a senior public service associate emeritus at the University of Georgia’s Odum School of Ecology, recalled. That initial encounter sparked a multi-decade effort to collect samples and analyze the fish, ultimately leading to their formal classification.
Researchers collected samples from 14 sites within the Savannah and Saluda River basins to study Bartram’s bass, and from 14 locations in the Altamaha and Ogeechee River systems for the Altamaha bass. While previously grouped with redeye bass, closer examination revealed distinct physical characteristics. Bartram’s bass, or Micropterus pucpuggy, boasts a light golden hue with dark brown blotches, a mottled belly, and fins tinged with rosy color. They also have a striking oval tooth patch and vivid red eyes framed by a thin gold ring, and can grow up to 15 inches long. The Altamaha bass, scientifically known as Micropterus calliurus, shares the golden scales but with olive edging and darker markings, accented by orange fins and a smaller tooth patch. Like its counterpart, it also features the distinctive red eye with a gold ring, reaching approximately 14 inches in length.
Unlocking Identity with DNA
The visual differences were compelling, but it was the advent of advanced genetic analysis that truly cemented the classification of these two species. “It used to be that you’d have to go out and catch the fish, bring it in, count the scales, measure the tail, measure this and that, write a description, and you’re done,” explained Mary Freeman, co-author of the study and adjunct faculty at the Odum School. “Now there is also genetic characterization. In this case, there’s genetic characterization of every single individual used to describe that fish to prevent including hybrid specimens.”
The research team analyzed mitochondrial DNA and compared segments of nuclear DNA using sophisticated bioinformatics tools. The study meticulously examined over 100 specimens to define the two new species, drawing from a larger dataset of 570 fish encompassing various bass species including smallmouth, largemouth, northern spotted, shoal, Tallapoosa, redeye, and Alabama bass. This comprehensive genetic mapping provided definitive proof of their distinct lineages. As Mary Freeman noted, “You’re laying the baseline for the future. Hybridization may result in Bartram’s bass not existing as it has existed, but we’ll know what it was.”
A Delicate Balance: Habitat and Hybridization
Both Bartram’s and Altamaha bass thrive in flowing river systems, favoring pools and fast-moving waters near rocky shoals. However, these habitats are increasingly threatened by human activity. Sediment buildup from erosion and the construction of dams have fragmented waterways, disrupting the natural flow and impacting the fish populations. The U.S. Geological Survey provides extensive data on water resources and dam impacts, highlighting the widespread alterations to river ecosystems across the country.
Adding to these challenges is the increasing risk of hybridization. The introduction of non-native Micropterus species into these ecosystems creates opportunities for interbreeding, potentially diluting the genetic integrity of Bartram’s and Altamaha bass. “These evolutionarily distinct lineages are important to name,” Bud Freeman emphasized. “In recognizing these species, we recognize how quickly they are becoming lost as extrinsic barriers are breached by human activities.”
Honoring History and the Future of Conservation
The naming of these bass species also reflects a connection to the region’s history and indigenous cultures. Freeman proposed the name Bartram’s bass in the 1990s, and the scientific name M. Pucpuggy pays tribute to the Seminole-Creek people of Florida. William Bartram, a renowned naturalist who explored the region from 1773 to 1776, was given the name “Puc Puggy,” meaning “Flower Hunter,” by a Seminole chief. Bartram’s detailed observations of the flora and fauna of the area laid the groundwork for future ecological studies. The Altamaha bass, or M. Calliurus, derives its name from words signifying “elegant tail.”
The research, published in Zootaxa, involved a collaborative effort from researchers at the University of Georgia, the South Carolina Department of Natural Resources, Oxford College of Emory University, and the University of North Georgia. Funding for the project was provided through a Competitive State Wildlife Grant awarded to the South Carolina and Georgia Departments of Natural Resources.
The formal recognition of Bartram’s and Altamaha bass is a crucial step in their conservation. Researchers will continue to monitor these populations and assess the impact of hybridization and habitat loss. The next step involves developing targeted conservation strategies to protect these unique species and ensure their survival for generations to arrive. The Georgia Department of Natural Resources provides information on conservation efforts in the state, including opportunities for public involvement.
This discovery serves as a powerful reminder of the hidden biodiversity that still exists within our ecosystems and the importance of continued research and conservation efforts. Share this story to raise awareness about these newly recognized species and the challenges they face.
