Populations and Ecosystems 0.0 / 5 ? BiologyEcology, ecosystems and environmental biologyA2/A-levelAQA Created by: JessicaCreated on: 29-11-13 16:25 What is a abiotic factor? Non-Living parts of the environment 1 of 8 What is a biotic factor? The living parts of the environment 2 of 8 What does random sampling avoid? It avoids bias when collecting data, meaning data is valid. 3 of 8 What is the calculation for estimated population size? Total number of individuals in first sample x total number of individuals in second sample/ number of marked individuals recaptured. 4 of 8 How do you find life expectancy on a survival curve? Its 50% of the total living population. 5 of 8 What is intraspecific competition? Competition between organisms in the SAME species 6 of 8 What is interspecific competition? Competition between two DIFFERENT species 7 of 8 Name examples of abiotic factors that limit population size Light intensity, temperature, mineral 8 of 8
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