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, or Syncope, is a temporary loss of consciousness and muscle tone due to blood loss to the brain. It is usually caused by hypotension, or low blood pressure. -source. Dizzy spells and feeling like youâre going to faint or pass out can be an anxiety symptom and nothing more.