4.3: Explain How Quadrants can be Used to Sample the Distribution of Organisms in their Habitats

QUADRANTS: Square Made of Wires that is Divided into Smaller Areas in which Organisms underneath are Identified and Counted

MEASURING DISTRIBUTION OF ORGANISMS:

DISTRIBUTION OF ORGANISMS IN HABITAT

Diagram showing How Quadrants are Utilised in the Field

METHOD: Place Quadrant Randomly within Sampling Area Count the Populations of Different Species within the Quadrant Repeat this Numerous Times within Sampling Area using the Same Size Quadrant Show Results on Map of Sampled Area, Showing in Which Areas Populations of Different Species are Dense or Not

INCREASING RELIABILITY OF RESULTS: Randomly Placed Use Same Size Quadrant Each Time Reliability of Results will Increase as More Samples are Taken

4.2: Explain How Quadrats can be Used to Estimate the Population Size of an Organism in Two Different Areas

QUADRANTS: Square Made of Wires that is Divided into Smaller Areas in which Organisms underneath are Identified and Counted

MEASURING POPULATION OF ORGANISM:

ESTIMATING POPULATION SIZE OF ORGANISM

Diagram showing How Quadrants are Utilised in the Field

METHOD: Place Quadrant Randomly within Sampling Area Count the Number of Members of an Organism (Same Species) within the Quadrant Repeat this Numerous Times within Sampling Area using the Same Size Quadrant Repeat the Process in another Area to Compare Results

CALCULATION: The Equation to Calculate the Estimate of the Population Size of an Organism: Population Size = ( Total Area / Sampled Area ) x Number of Organisms Found

4.1: Understand the Terms Population, Community, Habitat and Ecosystem

DEFINITIONS:

TERM	DEFINITION
POPULATION	Number of Members of a Single Species
COMMUNITY	Different Species of Organisms Living in the Same Area
HABITAT	Where Living Organisms Live
ECOSYSTEM	Population of Different Species of Organisms and the Habitat that they Live in