How to Recognize a Female
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Depending on where we are, our senses work differently to recognize those around us. Sometimes a shape is enough, other times a particular scent, or perhaps a familiar voice. Even in the rest of the animal world, the senses are essential to identify a predator, prey, or a potential partner. But not all species are equally studied and many recognition strategies remain a mystery. A recent study has shed light on the recognition mechanisms of male Furrowed Wood Turtles (Rhinoclemmys areolata), revealing which senses are used to distinguish a female.
The study involved 17 adult males, tested with 4 stimuli: a concave cup that simulated the shape of a conspecific (visual control), a saucer impregnated with the odor of a female, an empty carapace, and a live female. The experiments were conducted in separate sessions, and the arena was divided into quadrants to monitor movements and time spent in each area. The turtles were observed on video and the behaviors were classified as search (exploration) and interaction (actions directed towards the stimulus).
Males were attracted to all stimuli even at a long distance, showing both visual (cup, carapace, and female) and olfactory (saucer and female) sensitivity. However, as they approached the objects, their reactions changed: the cup, although initially interesting, was quickly ignored, a sign that it was not recognized as a conspecific. The smell of the saucer instead elicited intense search behavior, even though the female was not physically present. The carapace elicited both search and interaction. The live female, as expected, elicited the greatest number of interactions, thanks to the combination of smell and movement.
An unexpected result was the high amount of time spent by males near the corners of the arena, suggesting a behavior known as thigmotaxis: a tendency to move along walls and corners to feel safer, a phenomenon never observed before in terrestrial turtles.
The study highlights how males of Rhinoclemmys areolata are multisensory and capable of distinguishing a female through the combined use of visual and olfactory stimuli. The results expand knowledge on the communication mechanisms of land turtles, opening new perspectives for the study of their exploratory and reproductive behaviors.
See You Soon and Good Science!
Source Picture by Cassola F. M.
