Artemia monica is the unique species of brine shrimp found only in Mono Lake. During the summer months, trillions of shrimp inhabit Mono Lake’s waters—enough to be a critical food source for millions of birds. Once winter begins to set in the shrimp die off, and the birds migrate on. A new generation of shrimp hatches in the spring, food for next year’s birds in the following summer. This process has repeated itself enough times and with enough consistency that all our favorite Mono Lake birds have figured it out and rely on the food supply.
Figure 14 (below) of the annual Mono Lake Limnology Monitoring Report shows the lake’s average abundance of adult Artemia per square meter water column for each month starting in 1982 and ending in 2013. You can see that Mono Lake’s adult brine shrimp are most abundant in summer, and if you’ve visited Mono Lake during the summer, you probably know some of the bird species that show up for the feast.