Get a grip: unusual disturbances drive crayfish to improvise

Abstract Animals that face unusual situations react instinctively in order to efficiently adapt to changes in the environment. Persistence leads training and learning the developed solution, which can then be applied to similar challenges in the future. We experimented on adult narrow-clawed crayfish extracted from both lentic and lotic habitats. We proved that the latter were more prone to grabbing objects during acute exposure to water currents. Chronic exposure of specimens from lentic habitat to water currents led to intense training in clumping activity, gripping quickly to adherent side objects regardless of the origin (natural or artificial). The behaviour was significantly reduced after the trained specimens were returned to an environment without water currents for a four-week period. The results suggest that crayfish can learn a solution when faced with a disturbance; once the disturbance disappeared, the trained response was no longer needed and lost.