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.
In one sense, fainting is nature's way of telling us to lie down by falling down. This is the reason massage practitioners rarely have clients fainting on a table. They are already lying down and gravity is working in their favor.