Biotic and Abiotic Factors Students will describe biotic and abiotic parts of an ecosystem in which organisms interact.

Biotic Factors Biotic, meaning of or related to life, are living factors. Plants, animals, fungi, protist and bacteria are all biotic or living factors.

Abiotic Factors Abiotic, meaning not alive, are nonliving factors that affect living organisms. Environmental factors such as habitats (pond, lake, ocean, desert, mountain) or weather such as temperature, cloud cover, rain, snow, hurricanes, etc. are abiotic factors.

Biotic Factors interact with each other in complex ways such as Predator, prey Carnivores eating herbivores Herbivores eating plants also interact with abiotic factors in the ecosystem such as Plants and animals are dependent upon water, minerals, temperature, and light

Ecosystem Biotic and abiotic factors combine to create a system or more precisely, an ecosystem. An ecosystem is a community of living and nonliving things considered as a unit.

Changes Biotic and abiotic factors are interrelated. If one factor is changed or removed, it impacts the availability of other resources within the system. Changes in resources cause changes in plant and animals within the ecosystem.

The Impact of Changing Factors If a single factor is changed, perhaps by pollution or natural phenomenon, the whole system could be altered.

For example: Acid rain in certain regions has resulted in the decline of fish population.

Organisms in an Ecosystem Look at the picture on the next slide. Make a list of biotic and abiotic factors. Choose one animal. Describe how the animal is dependent upon other biotic and abiotic factors in this ecosystem.

References http://library.thinkquest.org/CR0210243/Science%20Station/How%20living%20things%20interact%20with%20their%20environment/relationship%20of%20biotic%20and%20abiotic%20factors.htm www.srl.caltech.edu/.../www/animals.html