Sampling technique for biodiversity indexing

• Can be done by two methods:

A) Plot Method (Quadrates):

• It includes 3 types:

a) Rectangular

b) Square

c) Strips (Sometimes)

• For small area study i.e. communities of microorganism, insects, herbs, soil micro-fungi, etc = 1 x 1 m²
• For large area or animal i.e. shrubs, small trees, insects, amphibians and small reptiles. = 10 x 10 m².

B) Plotless method:

• For studying mobile organisms such as butterflies, birds and animals.
• Use of transects, traps and mist nets.
• Variable distance transects if perpendicular distance measurement is possible.
• Fixed distance transects (20-50 m) if perpendicular distance measurement is not possible.
• For shy (nocturnal) organisms’ traps can be used.
• Pitfall traps for arthropods, reptiles and amphibians.
• Box trap for Rat.
• Mist net for birds.