Andreas Fischer, Natalie De Vita, Sophia Phillips Sproule, Gerhard Gries

• Starving animals must balance their resources between immediate survival and future reproduction. False widow spiders, Steatoda grossa, inhabit indoor settings with scarce prey. Here, we investigated the effects of lengthy starvation on the physiology, web architecture, sexual signaling, and reproductive success of S. grossa females. Compared to well-fed females, starving females (1) lost body mass faster, (2) had lower survival, (3) produced more silk for prey capture than for safety, and (4) deposited less contact pheromone components on their webs but accelerated their hydrolysis to mate-attractant components. As starving females became infecund – but still attracted and copulated with males – they misguided males that would gain reproductive fitness by selecting fecund females. Whether starving females store sperm and potentially regain fecundity upon feeding is still unknown. Our study shows how prey shortage shapes sexual signaling, predation, and reproductive behavior of S. grossa females that seem to engage in deceptive signaling.