What is a cline in biological terms?

A cline in biological terms refers to a gradual change in a trait within a species that correlates with an environmental gradient. This concept illustrates how certain characteristics, such as physical traits or genetic variations, can vary continuously along a geographic or ecological gradient due to varying environmental pressures. For instance, a population of plants may become taller as one moves from a dry area to a more humid one, reflecting adaptations to those specific conditions.

This concept is fundamental in understanding how organisms adapt to their environments over space, showcasing the connection between environmental factors and biological diversity. Knowing about clines helps scientists study patterns of variation in natural populations and understand evolutionary processes.