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.
The scientific term for fainting is syncope. Fainting is usually caused by a lack of oxygen in the brain. Every case of fainting should be treated as a medical emergency until the cause is known. In Victorian England, women would faint to appear fashionably frail.