Transect

A transect follows a line across such a change—for example, from shade into open ground. Lay a tape measure along the line and place the same-sized quadrat at regular distances, such as every 2 m. At each position, record the target species’ count or percentage cover.

This core practical investigates the relationship between organisms and their environment. It uses a belt transect to sample organisms across an environmental gradient—for example, from deep shade beneath a tree to unshaded ground—and measures an abiotic factor at the same positions. Matching the biological and environmental measurements makes it possible to look for an association between them.

Place the same-sized quadrat at regular distances along this transect, counting the target species or recording its percentage cover at each position. If testing a possible link with light, use a light meter at each quadrat too. Record distance, the organism measurement and light intensity together, then plot and compare them.

A transect is useful when conditions change from one place to another, such as from the shade beneath a tree into sunlight. Lay a tape measure along that change. Place quadrats at regular distances along the line, recording each distance and the number of the target species in its quadrat.