SAEDNEWS: when a golden bell and female green frog isn't pleased by the song of a male, she might opt to turn him into a meal.
According to SAEDNEWS: Breeding season can be fraught with peril for male frogs trying to win over a mate. Recent research reveals that these ambitious suitors may become prey for their unimpressed female counterparts, leading to some startling discoveries.
For the first time, scientists on Kooragang Island in New South Wales, Australia, have documented adult female green and golden bell frogs (Litoria aurea) preying on males during the breeding season. This intriguing behavior was highlighted in a study published on June 12 in the journal Ecology and Evolution.
The researchers stumbled upon this behavior while conducting a survey, when they were drawn to a high-pitched scream—often a sign of a frog in distress. John Gould, the study’s lead author and a postdoctoral researcher in population ecology at the University of Newcastle, recounted, "You hear it sometimes in the field, and it's often a frog that's being predated upon."
Following the source of the cries, Gould discovered a male frog whose thigh was nearly swallowed by a larger female, who was dragging him into a hole near a pond. "The male frog really tried to resist, grabbing onto anything he could, like sticks and roots, to stop himself from being pulled in," he explained. Fortunately, the male managed to escape.
This eye-opening observation led Gould and his team to examine their findings across three consecutive breeding seasons, comparing their nocturnal encounters to existing studies on sexual cannibalism. While amphibian cannibalism has been documented before—primarily in instances of adults consuming juvenile frogs or tadpoles—this specific behavior among breeding adults is rare.
Interestingly, many frog species exhibit sexual dimorphism, meaning females are often significantly larger than males. Gould suggested that this size difference provides an opportunity for females to exploit males, not just as potential mates but also as a food source.
The researchers hypothesized that this cannibalism might be a form of natural selection. During breeding season, females could assess potential mates—or prey—based on the quality of their calls. Larger males with deeper, more appealing calls may be preferred for reproduction, while smaller, less impressive males could end up as the evening's meal.
However, it’s not just the smaller males who are at risk. Once the females lay their eggs, they might also choose to consume their mates, similar to the notorious behavior of female praying mantises.
"It's a risky business for male frogs," Gould noted. "They're calling their hearts out in search of a mate, but they also have to contend with the possibility of being chosen as dinner."
Despite the fascinating insights provided by this research, there remains much to learn about these cannibalistic behaviors. Observations of sexual cannibalism are rare, largely because they happen so rapidly. Yet, this doesn’t imply that such occurrences are uncommon, according to Gould.
He also highlighted that the observation of amplexus—when a male frog mounts a female to fertilize her eggs—is similarly rare in field studies, even though it’s a critical aspect of breeding.
The team calls for further research to better understand how often these cannibalistic events occur and their impact on local populations of green and golden bell frogs. As we delve deeper into the complex and sometimes brutal world of frog reproduction, one thing is clear: the quest for love in the animal kingdom can often have deadly consequences.
