Required Practical: Ecosystems (OCR GCSE Biology A, Combined (Gateway Science Suite)): Flashcards
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Definition of transect
Definition of transect
Straight line along which ecological measurements are taken at regular intervals to study habitat changes
Definition of quadrat
Definition of quadrat
Square frame (usually 1m x 1m) used to isolate a sample area for study
Definition of distribution
Definition of distribution
The way organisms are spread across an area
Definition of abundance
Definition of abundance
The number of individuals of a species in a given area
Purpose of using transects
Purpose of using transects
To study how distribution of organisms changes across a habitat
Interval for placing quadrats along transect
Interval for placing quadrats along transect
Regular intervals (e.g., every 2 metres)
Purpose of using quadrats
Purpose of using quadrats
To estimate population size/abundance of organisms in an area
Why place quadrats randomly?
Why place quadrats randomly?
To avoid bias
Why repeat quadrat sampling multiple times?
Why repeat quadrat sampling multiple times?
To get a reliable average
Mean in ecological data
Mean in ecological data
Average number of organisms per quadrat
Mode in ecological data
Mode in ecological data
Most common number of organisms found in quadrats
Median in ecological data
Median in ecological data
Middle value when numbers of organisms are arranged in order
Why take sufficient number of samples?
Why take sufficient number of samples?
To make data reliable
Environmental factors to consider in ecosystems
Environmental factors to consider in ecosystems
Light, temperature, and moisture
How to estimate total population from quadrat data?
How to estimate total population from quadrat data?
Calculate mean per quadrat, then scale up to entire area