A synchronized feast
In the foothills of the Tian Shan mountains, the wild pistachio forests of the Fergana Valley engage in a coordinated survival strategy known as masting. These aren't just any pistachios; they are Pistacia vera, the wild ancestors of the commercial nuts we eat today. For several years in a row, the trees produce almost no nuts, a period called a "bust." Then, with region-wide synchrony, they erupt in a "boom" or "mast" year, producing a massive, coordinated crop.
This boom-and-bust cycle is an evolutionary strategy called predator satiation. During the lean bust years, seed-eating predators—primarily insects like the pistachio seed chalcid wasp (Megastigmus pistaciae)—are starved, and their populations dwindle. When the mast year arrives, the sheer volume of nuts overwhelms the surviving predators. There is simply too much food for them to eat, ensuring that a large number of seeds escape predation and have a chance to germinate. The strategy hinges on this "all-or-nothing" gamble, overwhelming the predators' consumption capacity. Cultivated pistachios also exhibit this trait, known to farmers as alternate bearing, where a high-yield year is followed by a low-yield one.