Sampling Techniques

This sampling method is used to estimate the size of a population where it is not practical to catch all the individuals within it. This is a live trap technique where the individuals are trapped and then marked harmlessly. The area is then sampled later and those species have been caught before are easily identified.

• capture-mark sampling
• tag-release sampling
• recapture-mark method
• capture-mark-recapture

This technique is used to measure the amount of suspended sediments in water. It is used to see how much light is passing through the water which affects photosynthesis.

• Transparency measurement
• Clarity measurement
• Turbidity measurement
• Opacity measurement

This sampling technique is widely used to sample inverterbrates living on the bed of a river or stream. It requires a net and rubber boots.

• Splash sampling
• Boot scooping
• River dredging
• Kick sampling

A frame with a cloth stretched across it is held under a tree or shrub and then the foilage is shook. The insects that fall on the cloth are then counted and catalogued.

• Beating tray method
• Leaf litter method
• Shaking and Collect method

• Shake-It-Off

  Shake-It-Off

This sampling technique uses a net on a pole that collects inscts and inverterbrates from long grass. The net is moved in a figure 8 or swung in a pendulum motion.

• Sweep netting
• Scoop netting
• Nothing but the bottom of the NET

• Swing netting

Used to collect active ground insects. A cup or beaker is buried so the lip is level to the ground. The insects fall in.

• Trapdoor trap
• Drop trap
• Ground trap

• Pitfall trap

A pin is dropped through a hole in a frame. The plant that the pin hits is identified and counted. If a plant is large enough to be hit by two or three pins it is counted once. If there are two plants of the same species hit by different pins, it counts as two.

• Point Quadrat

• Pin Quadrat

• Pin Drop Method

• T-Frame Quadrat

Uses UV lights or Flourescent light and traps to attract nocturnal insects.

• Bug zapper
• Light Traps

• Blinded By The Light

• Light Nets

Tags

NGSS.MS-LS2-4

What is the tool that is dropped into the water to measure turbidity called?

• turbidometer probe
• Secchi Disc

• clarity meter
• sediment sensor

T/F. The lower the turbidity, the clearer the water.

• True
• Depends on the source
• False
• Partially true