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.
Ask them to sit for several minutes before standing. Then be prepared to support them in case they faint again when they stand. If you suffer from episodes of fainting, the type of treatment your doctor offers will depend on the cause of your fainting spells and how often you experience them. Infrequent non-heart related fainting may not need to be treated.