Alaska has vast energy resources, although its oil reserves have been largely depleted. The population was severely depleted, and the species faced extinction. Marshall also examined possible genetic effects due to radiation from depleted uranium. In some cases, these aquifers are rapidly being depleted by the human population. Within 30 years, the soils had been significantly depleted of their natural nutrients. This replenishes iron stores that may become depleted during menstruation. Due to overconsumption, they are rapidly being depleted. By February 2017, however, the stockpile of MMR vaccines was depleted, and doctors were overburdened. Ammunition had been rapidly depleted by the cruiser squadron. By this point their number of MPs was severely depleted. There have been times when drought has seriously depleted the dam. By this stage stocks had been largely depleted. Overfishing has depleted a number of the historic fisheries. By the mid-1980s, the original mine had been largely depleted. However, poorly chosen investments depleted his fortune.