Too many males to choose from can overwhelm female frogs – and change who gets to mate
Many animal species – frogs and humans alike – struggle to make choices in a complex, overwhelming world.
In the world of animal behavior, choice overload can have surprising effects on decision-making, even in the case of female gray tree frogs. Scientists have observed similar cognitive constraints in other species, but little is known about how these constraints impact animals in their natural environments. In a new study, researchers found that when faced with too many male mating calls, female gray tree frogs experienced decision-making difficulties.
These frogs live in wooded areas near water sources in North America and rely on the calls of males to choose their mates. Males that produce longer calls are more attractive to females. In the study, 60 female tree frogs were presented with recordings of male calls in varying numbers. As the number of shorter, less attractive calls increased, the females had a harder time selecting the desired call, took longer to make a decision, and were more likely to choose no call at all within a 10-minute timeframe.
The researchers ruled out energetic masking, which occurs when overlapping signals impair an individual's ability to detect and discriminate a signal from the noise. Instead, they concluded that the females' cognitive limits were the cause of their decision-making challenges. This finding has significant implications for the mating success of gray tree frogs.
If females have difficulty recognizing their preferred calls in a real-world breeding chorus, they may inadvertently mate with less desirable males, passing on their less favorable traits to their offspring. This could have negative consequences for the overall fitness of the species. The researchers suggest that this cognitive overload in females could present opportunities for less attractive males.
These males might benefit by joining larger breeding choruses, where the sheer number of competitors makes it more difficult for females to discriminate against them. On the other hand, more attractive males may have an advantage by calling in smaller groups or even alone. The researchers plan to further investigate these possibilities, focusing on how much choice overload affects female mating decisions in real-world scenarios, where calls overlap and other factors come into play.
This study contributes to a growing body of evidence suggesting that cognitive constraints are a common factor in animal decision-making, not just in frogs but also in other species such as bees, ants, and mosquitoes.
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