B4 ocr gateway - population and ecosystems

B4 flash cards with definitions and everything you need to know about biodiveristy, distribution, ecosystems and habitats for GCSE biology OCR gateway b - the new specification!

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Give 2 methods of capture-recapture.
1. Mark and Estimate 2. Pitfall trap
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Capture-recapture assumes that...
- no movement of population(death). - identical sampling methods. - markings do not effect survival
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What is a community?
A group of different species of organisms living together
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Define 'ecosystem'
All the living organisms living together in a self supporting area
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What is a habitat?
The particular place where a community of organisms live
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A population is...
The total number of one type of organism in an area
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What is distribution?
The area where organisms are found - mapped using a transect line
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A fish farm is an example of a..
Artificial ecosystem
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A native woodland is an example of what type of ecosystem?
Natural
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Define Zonation.
The gradual change of distribution of species across a habitat
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Define Biodiversity
The measure of the variety of life in an area
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Why do natural ecosystems have a higher biodiversity?
The organisms are healthier so are better at coping with change - more diverse
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Other cards in this set

Card 2

Front

Capture-recapture assumes that...

Back

- no movement of population(death). - identical sampling methods. - markings do not effect survival

Card 3

Front

What is a community?

Back

Preview of the front of card 3

Card 4

Front

Define 'ecosystem'

Back

Preview of the front of card 4

Card 5

Front

What is a habitat?

Back

Preview of the front of card 5
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