Pampas grass can displace native plants and create their habitats, which deplete biodiversity . The metabolic processes required for alcohol elimination deplete essential vitamins and electrolytes. As a result, increased endogenous melatonin production can deplete serotonin levels and may cause depression. Additionally, pulegone and menthofuran may deplete glutathione levels, leaving hepatocytes vulnerable to free radical damage. Thus, chronically elevated PTH will deplete bone stores. Oysters are subject to various diseases which can reduce harvests and severely deplete local populations. CFCs that deplete the ozone layer are chlorofluorocarbons. During this process, decomposing microbes deplete the shallow water of all oxygen, suffocating larger decomposers. Without this replenishment, the octopus will gradually deplete its oxygen and ultimately die. They therefore deplete the soil of oxygen and create the need for anaerobic respiration. Although structurally similar to chlorofluorocarbons (CFCs), tetrafluoromethane does not deplete the ozone layer. Therefore, they believe that uranium will not deplete in the foreseeable future. The treaty is structured around several groups of halogenated hydrocarbons that deplete stratospheric ozone. Overconsumption of seeds from "Ginkgo biloba" can deplete vitamin B. Overconsumption of seeds from "Gingko biloba" can deplete vitamin B.