Severe mammal declines coincide with proliferation of invasive Burmese pythons in Everglades National Park

A dramatic decline in mammal populations within Everglades National Park (ENP) has been linked to the proliferation of invasive Burmese pythons. Research shows a 99.3% decrease in raccoon observations, alongside significant drops in opossum and bobcat sightings, with rabbits no longer detected during road surveys from 2003–2011. These declines coincide with areas where pythons have recently established themselves, suggesting predation by these apex predators has severely impacted local mammal populations. The study highlights the potential for introduced giant constrictors to exert significant top-down pressure on prey species, raising concerns for less observable or rare mammals of conservation concern.

Dorcas, M. E., Willson, J. D., Reed, R. N., Snow, R. W., Rochford, M. R., Miller, M. A., Meshaka, W. E., Andreadis, P. T., Mazzotti, F. J., Romagosa, C. M., & Hart, K. M. (2012). Severe mammal declines coincide with proliferation of invasive Burmese pythons in Everglades National Park. Proceedings of the National Academy of Sciences, 109(7), 2418–2422. https://doi.org/10.1073/pnas.1115226109