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Ecosystems, succession, sampling and population change

Biodiversity, evolution and ecology · Lesson 3 of 4

Lesson 3 of 4

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Lesson 3 of 4 · Biodiversity, evolution and ecology

Ecosystems, succession, sampling and population change

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By the end you’ll be able to

define ecosystem, niche, habitat, population and community, and explain interactions between organisms and between organisms and their abiotic environment
describe and explain ecological succession from pioneer stages to climax community, including changes in abiotic conditions, species diversity, biomass and stability, and distinguish primary from secondary succession

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select and apply appropriate sampling techniques, including random sampling with quadrats, transects and mark-release-recapture, to estimate distribution, frequency, percentage cover, abundance or population size

calculate mean, percentage cover, population estimates and changes in population size, using the Lincoln index where appropriate, and recognise assumptions and limitations of sampling methods

interpret data on population change in relation to natality, mortality, immigration, emigration, carrying capacity and biotic or abiotic factors, including predator-prey relationships and competition

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