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ECOSYSTEMS AND COMMUNITIES Learning Goal: In this lesson we will learn about abiotic and biotic components of an ecosystem. We will also learn about how populations interact with other populations within their communities. BIOTIC VS. ABIOTIC FACTORS Biotic factor: __________________________________________________ Abiotic factor: __________________________________________________ Can you list abiotic and biotic factors in this picture? HABITAT VS. NICHE ________________: the area where an organism lives, including the biotic and abiotic factors that affect it _________________: an organism’s habitat plus its role in an ecosystem COMMUNITY INTERACTIONS _________________: when organisms of the same or different species attempt to use an ecological resource at the same time Example: in a forest, broad-leaved trees may compete for sunlight by growing tall, spreading out their leaves and blocking sun to shorter plants • Competitive exclusion principle: no two species can occupy the same niche at the same time _________________: an interaction in which one organism captures and feeds on another organism Example: Some types of bears capture and eat fish _________________: symbiotic relationship in which one organism benefits while the other is harmed Example: fleas, ticks and lice feed off the blood and skin of mammals _________________: symbiotic relationship in which both organisms benefit Example: oxpeckers eat the insects off large mammals in Africa _________________: symbiotic relationship in which one organism benefits while the other is neither harmed nor does it benefit Example: Remoras eat the small pieces of food that are created when sharks eat