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Transcript
Biotic & Abiotic Factors College Biology Facilitator: Mr. Lee Room 320 Objectives • Identify Biotic Factors of an ecosystem • Identify Abiotic Factors of an ecosystem • Describe the differences between Primary and Secondary Succession Biotic and Abiotic Factors • Ecosystems are influenced by a combination of biological and physical factors • Biotic factors are biological influences on organisms – These are all the living organisms that each organism interacts with – Examples are: trees, birds, and mushrooms Biotic and Abiotic Factors… • Abiotic factors are physical, or nonliving factors that shape ecosystems – Examples are the climate, wind, soil type, and sunlight • Habitat- is the area where an organism lives Ecological Succession • Ecosystems are constantly changing in response to natural and human disturbances • As older inhabitants die out new organism move in, changing the community • Ecological succession is a series predictable change that happens in a community over a period of time Primary Succession • Succession that occurs where no soil exist • Happens on surfaces formed as volcanoes make new islands or cover the land with volcanic rock • Can occur on bare rock left exposed by glaciers Primary Succession Primary Succession… • Pioneer species are the first species to populate the area – Lichens- is made up of a fungus and an alga – The lichens help to break down the rock – As they die they add organic material to help make soil Lichen You Secondary Succession • Happens after a natural event (like a fire), or by human activities • When the disturbance is over, community interactions tend to restore the ecosystem back to its original condition Review • Identify Biotic Factors of an ecosystem: • Biotic factors are all the living organisms within an ecosystem • Identify Abiotic Factors of an ecosystem: • Abiotic factors are the physical, nonliving factors that shape an ecosystem • Describe the differences between Primary and Secondary Succession: • Primary Succession occurs where no soil exist • Secondary Succession happens after a natural event (like a fire), or by human activities Learn Long Live Long