Populations and Sampling

"a randomly selected square plot marked in an ecosystem. Organisms are counted, and the average number in each plot is taken, then an estimate of population can be calculated" Name this population counting method.

• Capture-Recapture

• Quadrats

• Averaging

• Random selection

If I wanted to know how many blades of grass are inside the track, which sampling method could I use?

• count every blade of grass

• Mark a random number of blades of grass, return two days later and recapture the blades

• Divide the grassy area into 1 inch sections, randomly pick several sections to count, average them together and multiply that by the total square inches.

Tags

NGSS.MS-LS2-1

Which of the following accurately describes the difference between capture-recapture and quadrat sampling?

• Quadrat sampling is used for mobile populations and capture-recapture is used for stationary populations

• Quadrat sampling is used for stationary populations and capture-recapture is used for mobile populations

• Quadrat sampling can only be used for small populations

• Capture-recapture sampling can only be used for small populations

Used to examine species occurrence during surveys, spatial distribution patterns, study daily activity rhythms, and study seasonal occurrence.

It uses a cup to collect!

• Beating Tray

• Interviews

• Pitfall

• Light Traps

Tags

NGSS.MS-LS2-1

To sweep through vegetation to collect random insects not easily seen. It requires skill and takes a lot of labor

• Sweep Net

• Surveys

• Kick Sampling

• Light Traps

A sampling technique for collecting a range of pests and beneficial insects. Uses a stick and cloth to gather insects.

• Quadrat

• Beating Tray

• CMR

• Interviews

Scientists sample the macroinvertebrates by kicking up the gravel on the bed of the river and catching everything that is disturbed in a net

• Kick Sampling

• Light Traps

• CMR

• Point Quadrats

The basic idea is that you capture a small number of individuals, put a harmless mark on them, and release them back into the population. Conservation and management of natural animal populations

• Water Turbidity

• Beating Tray

• Random Sampling

• CMR

commonly used to sample moth fauna, but they also collect other insects, including adult aquatic insects. Used to monitor or directly reduce populations of insects or other arthropods

• Pitfall

• Grid Quadrat

• Light Trap

• Beating Tray

The researcher must ensure that the chosen sampling interval does not hide a pattern. Any pattern would threaten randomness.

• Simple Random

• Systematic Samping

• Stratified Sampling

• Cluster Sampling