Biotic factors in an ecosystem are the participants in the food web, and they rely on each other for survival. A list of biotic factors includes those organisms that are producers, consumers and decomposers. The producers provide the food, generally in the form of plant life. Consumers eat the producers, or in the case of carnivores, other consumers. At the end of an organism’s life cycle, decomposers turn the organism's remains into organic material that can be used to provide energy for a new generation of producers.