This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: Imagine a crowded dance floor where bodies move to the beat beneath a glittering disco ball. Some of the dancers pair up, drawn together by the heady atmosphere.
For flies, as for humans, the right atmosphere can serve as a potent aphrodisiac. For the fruit fly Drosophila erecta, it is the scent of a fermented fruit that sets the stage, bringing together many flies for their courtship dance. It is this environment that D. erecta males need to trigger mating behavior: packed with other flies, visually stimulating and rich with the tangy aroma of their preferred fruit.
Without this scent, males show no interest in courtship. These findings, described by Rockefeller scientists in a new paper in Nature, reveal how ecology and social context shape mating behaviors and demonstrate how the neural activity behind them is cued. "While D. erecta shares the same conserved neural circuitry as other closely related Drosophila species, it's unique among them in that its brain requires an additional environmental input—the aroma of food—to activate neurons promoting sexual arousal," says first author Philipp Brand, a former postdoc in the Laboratory of Neurophysiology and Behavior and now a research group leader at the Max Planck Institute for Brain Research in Frankfurt.
"Without that scent, the males are completely uninterested in mating, in contrast to its close cousins." "Drosophila courtship behaviors are really beautifully tuned to the environment, which is especially interesting in light of fruit flies not being considered a social species," says lab head Vanessa Ruta. "This study nicely demonstrates an emerging principle: that courtship is shaped by ecological and social context and can't really be divorced from it. Intuitively, it makes a lot of sense.
We humans are very sensitive to how we respond to others depending on social context, so it's not surprising that other animals have evolved to do the same." While the complex tango of Drosophila courtship has long provided a model for studying the sensory and circuit mechanisms controlling sexual arousal, most studies have focused on single pairs of males and females in stripped-down laboratory settings that do not reflect the sensory-rich natural world where these matings take place among hundreds of flies jostling for space on the same fruit. "The observation of courtship and social behaviors in flies has occurred in this very abstracted environment," Ruta says. "Trying to replicate a more naturalistic setting provides a very different framing for thinking about the structure of these behaviors." Brand, an evolutionary biologist who conducted extensive fieldwork in Central America for his Ph.D. before joining Ruta's lab, aimed to explore social and host environments in a more native setting for the current study.
Because some initial findings suggested that olfactory circuits might be involved in social and courtship behaviors among fruit flies, the researchers constructed different environments reflecting a number of potential scenarios that a male fruit fly might find himself in: alone or with many others, with the scent of apple cider vinegar (ACV) as a proxy for the bouquet of fermenting fruit, or without any odor. Discover the latest in science, tech, and space with over 100,000 subscribers who rely on Phys.org for daily insights. d research that matter—daily or weekly. "We used large assay chambers with a central food patch of ACV on agar to mimic the presence of a fermenting fruit in the wild," Brand describes.
Extract — continue reading at the source.
