Ecology Sampling Methods Flashcards

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Why do ecologists use sampling instead of counting every organism in a habitat?

Sampling saves time and effort. It lets ecologists estimate numbers without counting every single organism in a large area.

What is a quadrat and what is it used for in ecology?

A quadrat is a square frame used to mark out a small area. It is used to sample and count plants or slow‑moving animals.

How do you carry out random sampling with quadrats in a field?

Mark out a grid over the area. Use random numbers to choose grid coordinates. Place the quadrat on each coordinate and count the organisms inside.

How can you estimate the population size of a plant in a field using quadrats?

Place quadrats in several random positions and count the plants in each one. Work out the mean (average) number of plants per quadrat, then multiply this by how many quadrat‑sized areas fit into the whole field.

What does percentage cover mean when using a quadrat?

Percentage cover is the percentage of the quadrat area covered by a particular plant species. You judge how much of the square it fills and record this as a percent, such as 40%.

What is a line transect and how is it used?

A line transect is a tape or string laid out across a habitat. You record which species touch the line, or are at set points along it, to show how distribution changes.

How is a belt transect carried out?

Lay a tape measure across the habitat. Place quadrats next to each other or at regular intervals along the line and count the organisms in each, giving a belt of sampled area.

How can you use a transect to investigate the effect of an abiotic factor, such as light, on plant distribution?

Stretch a tape from a shaded area to a sunny area. Place quadrats at regular points, measure light with a light meter at each point, and count the plants in each quadrat. Compare the results to see how light affects where plants grow.

What can you do to make ecological sampling more reliable and valid?

Use many quadrats or transects and repeat your measurements to make results more reliable. Use random sampling and careful methods to reduce bias so the results are more valid.

What is the mark–release–recapture method used for in ecology?

It is used to estimate the population size of moving animals. A sample is caught and marked in a harmless way, released, then a second sample is caught to see how many are marked.