A line transect is used to count species by which method?

A line transect is an effective method for counting and assessing species in a specific habitat. This method involves laying down a straight line across a habitat and then systematically observing and recording the species that come into contact with the line. By counting only those species that touch the line, researchers can obtain a clear and straightforward representation of species distribution and abundance along that transect.

This technique is particularly useful in ecological studies as it helps to minimize bias and allows for consistent data collection across different areas. By focusing on the organisms that are directly associated with the line, scientists can gather reliable data on species presence and density in specific habitats.

In contrast, the other methods mentioned are not utilized in a line transect approach. Marking and releasing organisms is a different technique used primarily to study population dynamics and estimate population sizes. Sampling randomly would provide varied data that might not allow for the focused assessment that a line transect offers. Using a net to capture organisms is more invasive and does not align with the standardized methodology of a line transect, which emphasizes observing and recording rather than actively capturing organisms.