These fluctuations may also affect the predators that feed on these prey items, such as wolves, foxes and owls. These predators must either find an alternate source of prey or risk starvation and death. Ecological Succession. When changes to either abiotic or biotic factors affect an entire ecosystem, ecological succession occurs.
A temporary decrease in blood flow to the brain results in unconsciousness, or fainting. Many disorders, some of them serious, can cause this.
Although the act of syncope can be terrifying, it is usually harmless and most likely does not signify a serious disease or a life threatening problem. For most people, syncope occurs once or twice in a lifetime; for others, various medical conditions may lead to numerous fainting spells throughout their life.