How Geckos Adapt to Heat Waves

A handful of small, nocturnal geckos have spilled their guts for science, revealing how the creatures get by in a part of Earth’s hottest landscape. Surface temperatures in the Lut Desert in Iran, home to the Misonne’s spider gecko (Rhinogecko misonnei), soar past 65° Celsius more frequently than anywhere else on the planet. The extreme heat makes it difficult for life to thrive, and for years, ecologists have regarded the desert as mostly barren. To find out how the geckos sustain themselves in this desolate oven, scientists analyzed the stomach contents of six geckos using DNA metabarcoding. The technique compares chunks of DNA with a species identification database, like a bar code scanner in a grocery store. Within the geckos’ digestive soup stewed DNA from 94 species, about 81 percent of which hail from outside the Lut Desert.

The majority of these outsiders were winged insects such as flies, moths, and wasps that migrate through the desert from bordering temperate landscapes. The remaining species — arachnids, arthropods, and more moths — are endemic to the Lut, but are elusive in its heart, where the geckos were collected. The unexpected diversity highlights that there’s more living in this desert than meets the eye.

The findings underscore the importance of intertwined food webs for animals to survive in hostile habitats. The movement of insects from outside the immediate area subsidizes the geckos and helps them to persist in this extreme desert environment,

CITATIONS M. Rajabizadeh, J. Morinière and H. Rajaei. Adaptation to the hottest spot on earth: Dietary ecology of an enigmatic desert gecko based on DNA metabarcoding. Journal of Zoological Systematics and Evolutionary Research. Vol. 59, November 18, 2021, p. 1470. doi: 10.1111/jzs.12558.