Dams & Crayfish Genetics

In Alabama, crayfishes are being separated and genetically changed, which increases the risk of local extinction. This work is not done by a mad scientist, but by dams with their reservoirs and unnatural pools of water. A novel study published in the journal Freshwater Biology by USDA Forest Service scientists Zanethia Barnett and Susan Adams,…  More 

Two New Species of Crayfish Discovered in Alabama and Mississippi

In 2011, a group of researchers traveled to southern Alabama and Mississippi in search of the Rusty Gravedigger crayfish (Lacunicambarus miltus). They wanted to refine the species’ range and hoped to find a new population west of Mobile Bay. Instead, they found a potentially undescribed species of crayfish. Years later, a team led by Mael…  More 

Digging Deep for Crayfish Clues

Kneeling in a wet prairie, arm extended to the armpit in a muddy hole, most biologists would quickly arrive at the thought, “There’s got to be a better way.” So it’s not surprising that, when it comes to sampling for burrowing crayfishes, researchers have devised some creative solutions. In the southeastern U.S. – the global…  More 

Women In Science: Zanethia Barnett

The Women in Science series features women scientists from across the Southern Research Station (SRS) – their education, career paths, challenges, achievements, and inspirations. Meet Zanethia Barnett, a natural resource specialist from the Center for Bottomland Hardwoods Research in Oxford, Mississippi. Specializing in freshwater fauna and aquatic ecosystems, Barnett conducts her research in the lakes, streams,…  More 

Vernal Crayfish Life History and Habitat Use

What to call a freshwater crustacean that resembles a small lobster? USDA Forest Service scientist Zanethia Barnett has a clever answer: “I study crayfish, but I eat crawfish.” More than half of the nation’s 357 species of crayfish — also known as crawdads, mudbugs, or yabbies — can be found in the Southeast. Crayfish break…  More 

Mystery Crayfish Highlights Conservation Challenges

On a recent sampling trip to the Bankhead National Forest in northwest Alabama a team led by U.S. Forest Service scientist Susie Adams scooped up a crayfish from a river flowing into the Lewis Smith Reservoir. The crayfish had a distinctive black, orange, and white color pattern on the tips of its largest claws, which quickly…  More 

Freshwater Crayfish in Peril Worldwide

In early January, scientists led by the Zoological Society of London (ZSL) published results of a global assessment that shows that almost a third of the world’s species of crayfish are threatened with extinction. U.S. Forest Service aquatic ecologist Susie Adams was a co-author on the report and provided important information about North American crayfish…  More