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pop in ecosystems

bio topic 13

QuestionAnswer
How can populations be estimated? By use of quadrats
What is the size of a standard quadrat? 50x50cm or 0.25m^2
What does a point quadrat measure? frequency
What does a frame quadrat measure? percentage cover
How do you increase the reliability of findings with a quadrat? increase number of samples taken in habitat
How do you ensure results are unbiased? using random sampling
Equation for estimated total population ETP = (no. organisms in sample 1 x no. samples in sample 2)/no. marked organisms recaptured
What is succession? change in community over time. Due to changes in biotic factors and/or species present
What is the name of the first species to colonise newly exposed land? pioneer species
What are features of pioneer species? ability to fix nitrogen from the air as not available in soil ability to photosynthesise tolerant to extreme conditions
What is a climax community? most biodiversity possible, vegetation is in an equilibrium with the environment and no influx of new species.
What is the difference between primary and secondary succession? in secondary succession soil is already present, whereas in primary succession, soil is formed by erosion and weathering by the pioneer species.
What in interspecific competition? between individuals of different species - competition for resources eg food water and habitats
What is intraspecific competition? between individuals of the same species - compete for food, water, mates, breeding sites, mineral ions, etc
What is conservation? management of Earth's resources - maximum use while maintaining biodiversity
What reasons are there to justify conservation? economical - new substances from different species ethical - they are living too cultural - enrich our lives, contribute to art
Created by: Ziggyisweird
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