Rabbits Altered Island Ecology for Decades

In 1874, European rabbits were introduced to the Kerguelen Islands, leading to a significant ecological shift. These rabbits, lacking natural predators, rapidly multiplied and consumed vast amounts of vegetation. Their burrowing activities destabilized the soil, increasing erosion and facilitating the invasion of non-native plant species.

A 2004 study revealed that the introduction of rabbits had a profound effect on the islands' plant life. Sensitive native species, including the Kerguelen cabbage and cushion plant, became scarce or vanished entirely from areas where rabbits grazed. Coastal regions became dominated by Acaena magellanica, forming near-monocultures.

Following rabbit eradication programs that began in the 1990s, research has examined the recovery process. While the number of plant species increased on some islands post-removal, the recovery of native vegetation and soil fungal communities has proven to be exceptionally slow. A 2015 study indicated that even after two decades, ecological communities on previously rabbit-infested islands remained similar to those still harboring rabbits, suggesting long-term ecological disruption.

These findings underscore the persistent impact of invasive species on island ecosystems. The studies from the Kerguelen Islands demonstrate how a single introduced animal can alter plant life, soil structure, and microbial communities, with recovery taking many decades, emphasizing the need for caution in species translocations.