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Abiotic and Biotic
Ecosystems
• Interacting populations of organisms with biotic and abiotic factors
Abiotic Factors
• Non-living factors that affect the ecosystem: light, space, temperature, shelter, water, soil composition
Biotic Factor
• Living factors that affect the ecosystem: food sources, other population members, other species
Competition
• More than one individual, or population in an ecosystem, relies upon the same limited resources
Niche
• Role in an ecosystem
Limiting Factor
• A biotic or abiotic factor needed as a resource for survival; depletion prevents growth or expansion of the organism or population
Summary
• Resources for an organism’s habitat, including space, food, shelter, and water, may be limited or depleted by competition. Two species cannot operate in the same niche in the same environment.
• Organisms rely on natural resources in their environment such as quantity of light, water supply, and suitable temperature.
• Competition occurs when niches overlap and organisms seek the same resources, especially when the population density is high.