In order to assess the effects of rising carbon dioxide content on the terrestrial fauna of Cova de sa Font, a threefold sampling of troglobitic and troglophilic fauna was carried out, using baited pitfall traps, from December 2018 to October 2019. On the other hand, air composition (radon, CO2, water vapor) characterizing the whole vadose zone and the seasonal changes observed in cave-atmospheres are obvious ecological constraints for troglofauna.

This small cavern is actively ventilated during the cold season, but when ventilation ceases in the spring it starts to be invaded by CO2-enriched 'ground air' coming from the surrounding vadose crevices. Cova de sa Font is a rather simple descending anchihaline cave (25 m deep), that stands out for its extreme CO2 fluctuations throughout the year: from less than 800 ppm in the winter to values exceeding 60,000 ppm in the summer.

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