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20 Cards in this Set
- Front
- Back
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Ecosystem
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More or less self-contained functional unit in ecology made up of all the interacting biotic and abiotic factors in a specific area
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Ecological niche
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All conditions and resources required for an organism to survive, reproduce and maintain a viable population
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Poplation
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A group of individuals of the same species that occupy the same habitat at the same time
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Community
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The organisms of all species that live in the same area ('see also population')
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Habitat
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The place where an organism normally lives, which is characterised by physical conditions and the species of other organisms present
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Estimated population size
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(∑first sample * ∑second sample)/∑marked individuals recaptured
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What abiotic factors affect population size? ('4')
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Temperature, light, pH, water and humidity
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What are the two types of competition?
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Intraspecific (same species) and interspecific (different species)
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Remember what a predator-prey graph looks like and the delay
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When predator numbers are high, prey numbers are low, and vise versa
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Population growth =
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(births + immigration) - (deaths + emigration)
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Precentage population growth rate =
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(pop change during period/pop at start of period) x 100
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What factors affect birth rates? (Think)
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Economic conditions, cultural and religious backgrounds, social pressures and conditions, birth control, political factors
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Birth rate =
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(No births per year/total population in same year) x 1000 (remember one THOUSAND)
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Expanding
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Expanding
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Stationary/Stable
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Contracting
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Succession
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A term used to describe the change of an ecosystem over time
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Hostile conditions, low species diversity and instabilitity -->
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Less hostile conditions high species diversity and stability
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Succession flow chart
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Barren land --> Primary colonisers --> Secondary colonisers --> Tertiary colonisers --> Scrubland --> Climatic climax
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