Egg mass containing invasive adult termites Coptotermes gestroi
T Chouvenc, UF/IFAS
Florida’s latest termites offer a unique two-for-one deal, but there’s no celebration for them. Two species of invasive wood-eating insects have interbred, resulting in hybrid colonies that can produce extraordinarily resilient termites, posing a threat to both buildings and forests.
The results are “intriguing and unexpected,” notes Edouard Duquesne, a researcher at the Free University of Brussels, who was not part of the study. “The viable hybrids of these species could have a significantly broad geographic range, leading to highly invasive termites capable of causing severe damage.”
Since 2010, termite infestations have resulted in $40 billion in annual losses, with around 80% attributed to the Coptotermes genus. The Formosan subterranean termites (Coptotermes formosanus) have invaded many warm temperate regions of the Northern Hemisphere, while their Asian counterpart, Coptotermes gestroi, has expanded from Southeast Asia to tropical areas worldwide. Since the late 1990s, both species have overlapped in southern Florida, according to Thomas Chouvenc at the University of Florida.
In 2015, Chouvenc and his team demonstrated that these two species could produce hybrid offspring in controlled environments. By 2021, Chouvenc discovered alates—winged termites that establish new colonies—with characteristics merging those of the Formosan and the smaller, darker Asian species. These hybrids were identified in Fort Lauderdale, Florida, and were confirmed through genetic testing. A hybrid nest was also found in a local park adjacent to the marina.
In 2024, the existence of wild hybrids was validated by Taiwanese researchers, confirming that these species have coexisted for a century in southern Florida.
“It’s only a matter of time before we see hybridization and the establishment of hybrid populations wherever these two species coexist,” warns Chouvenc.
Researchers have also observed that first-generation hybrid females can mate with males from either parent species. Chouvenc expresses concern that gene flow between the species could lead to the emergence of a termite population that thrives in a wider range of environmental conditions, including temperature variations. The proximity of these termites to a busy port heightens the risk that such hybrids could be transported globally.
“We [humans] didn’t pay enough attention, and as a result, we’ve allowed these termites to spread,” Chouvenc added.
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Source: www.newscientist.com
