Topic 7 - Revision Flashcards
How do you work out population density of an area?
Number of organisms / Area Sampled
What is the process/procedure to ensure samples are random and representative (when using a Quadrat)?
Divide area into a grid,
Use a random generator to pick co-ordinates, Place a quadrat at the top-left of each co-ordinate
Record the co-ordinate (to ensure co-ordinates aren’t repeated) and count (e.g. no of daisies)
Repeat the process (until a running mean is consistent)
What is a running mean?
Where you take the mean of each sample (as you sample) and repeat samples until the mean is consistent/stable
What would you use instead of a quadrat, for sampling moving organisms?
A pitfall trap or a net (to mark-release-recapture)
What is the definition of an Ecosystem?
All of the organisms in a community and the abiotic conditions in the area which they live
What is the definition of Interspecific Competition?
Competition between members of different species
What is the definition of Intraspecific Competition?
Competition between members of the same species
What is the definition of a Habitat?
The place were an organism lives (within an ecosystem)
What is the definition of Carrying Capacity?
The maximum stable population size of a species than an ecosystem can support
What is the definition of a Biotic Factor?
The living components of an Ecosystem
What is the definition of an Abiotic Factor?
The non-living components of an Ecosystem
What is the definition of Niche?
The role of an organism within it’s habitat
What is the definition of a Community?
All the populations of all of the different species living in a given area at a given time.
What does population size fluctuate around?
The Carrying Capacity
What is Conservation?
The protection and management of species and habitats in a sustainable way