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.
Fainting happens when you lose consciousness for a short amount of time because your brain isnât getting enough oxygen. The medical term for fainting is syncope, but itâs more commonly known as âpassing out.â A fainting spell generally lasts from a few seconds to a few minutes.Feeling lightheaded, dizzy, weak, or nauseous sometimes happens before you faint.ypotension. Hypotension is the medical term for low blood pressure. Low blood pressure is good in most cases, but it may lead to fatigue, dizziness, or even loss of consciousness. It can be a symptom of an underlying condition.