We may currently be experiencing an age of extinction. Of course, this is not the type of extinction you may be familiar with; there are no dinosaurs or asteroids involved. Instead, we are dealing with mass threats to diverse species all over the world, and now we ask ourselves, is this the work of humans?
Take the eastern massasauga rattlesnake for instance. This snake, scientifically named Sistrurus catenatus, is a small, brown-grey rattlesnake with blotches all over its body, and is currently sitting on an engendered and protected species list (1). Once prevalent throughout the Midwest region and up into Ontario, Canada, this smooth-textured and bumpy-skinned pit viper has been nearly completely eradicated from its home as a result of habitat loss and an elusive, toxic fungal infection.
The eastern massasauga ranges in length from 18 to 30 inches, with a tough, thick body and a triangular shaped head. Known to be venomous, though rarely causing any fatalities, the snake also possesses heat-sensing pit organs between its slit-like pupils and nostrils on either side of its head, effectively allowing the snake to recognize its surroundings and potential prey nearby (2). When attacking, the eastern massasauga strikes fast and injects venom from its fangs into the body of the animal it is seeking to consume, which is usually small animals like mice. Though the venom from the snake is lethal to its prey, it is generally not recognized as being very dangerous to humans, as it injects much less venom than other rattlers. Additionally, the snake is known to be rather shy and does not attack humans unless provoked, an issue that is becoming more frequent in recent times.
It is not surprising to hear that humans and our actions are causing widespread negative outcomes on our surroundings. With the conversion of lands, whether it is forest, wetland, or prairie, into agricultural pastures and industrial areas, thousands of species are being removed from their native environments, and the eastern massasauga is no different. Originally a resident of wetlands and muddy areas near river deltas, the snake has lost over 50% of its home and is still on a downward spiral (3). Ethan Kessler from the Illinois Natural History Survey said that during his searches this past summer in local forests and areas snakes were once prone to, he has been unable to locate even a single massasauga. This habitat loss of the snakes has created small, isolated populations from once large snake-ridden areas, which drastically reduces the snake’s ability to grow in numbers.
The disappearance of the rattlesnakes is not simply an emotional event; rather, it is proof of the great loss in biodiversity and the huge consequences associated with it. The snake plays a role in the “circle of life,” as it is both predator and prey. Without its vital connection to population control, other species may become overpopulated or suffer population destruction as well. There is an offset in the balance of nature, and the conservation of massasaugas would mean the conservation of natural, supportive systems all over the Midwest region.
Over the past six years, an additional event has been wreaking havoc within massasauga populations, rapidly declining numbers and driving the snakes to the brink of extinction. The Chryosporium fungus is an emerging infectious disease that has been plaguing eastern massasauga rattlesnakes all over the Midwest. In 2008, researchers first noted symptoms of facial swelling and ulcers in snakes, leading them to identify the pathogen (4). Dr. Matthew Allender of the University of Illinois is an expert on the topic and says, “[this] disease causes widespread and ongoing deaths in populations that seriously threaten biodiversity across the United States.” He adds that this type of infection, though rare, has actually been seen in similar cases in the wild before: “Fungal pathogens have been increasingly associated with free-ranging epidemics in wildlife, including the well-known effects of white-nosed syndrome in bats.” The disease afflicting bats in this case has killed millions of bats already, something Allender is afraid may also happen to the eastern massasaugas, though not to the numerical extent of the bats (5).
Not only does the Chryosporium fungus swiftly kill eastern massasaugas and threaten their future, but in doing so, the fungus drastically reduce the snakes’ contribution to biodiversity. The deadly pathogen, coupled with the ongoing habitat loss faced by the snakes, is destroying the species removing it from the natural system it once belonged to, throwing off the balance of life. Unfortunately, as of now there does not seem to be a successful method in combatting the toxic fungus. However, Dr. Allender and researchers at the University of Illinois are working to develop successful approaches to the disease and rebuild the population, though the problem of habitat loss may reduce their effectiveness. As Dr. Allender implied, conserving species that make up our natural systems would be conserving our own futures.
Works Cited