Things are heating up in California, and we’re not just talking about the weather. It appears that warming associated with climate change is influencing amphibians’ “love language.”
A new study led by researchers at the University of California, Davis, indicates that environmental temperature plays a determining role in the form, rhythm and quality of mating calls emitted by male amphibians — with warmer waters producing a vocalization described by scientists as more “attractive”.
Research in Frontiers in Ecology and the Environment looked at the mating calls of the Sierra Nevada tree frog (Sierran treefrog) at two locations in California. The team set up microphones on the banks of ponds and ponds and recorded vocalizations throughout early spring, comparing them with variations in water temperature.
At the beginning of the season, when temperatures are still low, males tend to emit slower, “dragging” calls. As the ponds heat up, the sounds accelerate, become more insistent and, according to the main author, Julianne Nicethis change is easily noticeable not only to scientists, but also to females looking for a partner.
Despite this, the study suggests that females’ choice is not limited to selecting the “most charming” male.
In fact, call quality can act as a environmental conditions indicatorwhich helps females assess whether the time is safe for egg laying and development. Males normally arrive at breeding sites earlier and begin vocalizing as soon as possible to gain an advantage in the competition. Females, on the other hand, tend to delay their arrival until conditions favor the survival of the litter.
For the authors, this mechanism could have important implications in a context of global warming. If the ponds warm up sooner, the so-called “sexier ones”, as , ironically, could appear earlier, changing the reproductive calendar and the way in which amphibians adjust reproduction to seasonality.
In a scenario where 41% of amphibian species are threatened with extinction, understanding how and when reproduction occurs and how these timings shift is crucial for conservation strategies.
