This letter was published in Nature on August 20, 1955. It discusses the displacement activities in crabs. According to Tinbergen, “displacement activity is a behavior that belongs to the executive movement pattern of another drive other than the drive (drives) which is activated.” According to Bastek, Morris, and Moynihan, such activities appear to occur in two completely different situations: “(1) Displacement activities can lead to the performance of an animal in which two or more incompatible drives are strongly activated. Each drive inhibits the expression of the other (others). (2) Displacement activities can also lead to the performance of an animal in which one drive is simultaneously activated and inhibited.”
Introduction
Marine crabs are intriguing organisms, characterized by their displacement activities. This letter aims to study the displacement activities in marine crabs and understand the factors influencing them.
Concept of Displacement Activities
Definition of displacement activities according to Tinbergen and Bastek, Morris, and Moynihan. Displacement activities include situations in which activities are incompatible with other activated drives, occurring in two different cases.
Case of Incompatible Drives
Explanation of the case of displacement activities when there are strongly activated incompatible drives that inhibit the expression of other drives.
Case of Activated and Inhibited Drive
Explanation of the case of displacement activities when there is one drive that is both activated and inhibited simultaneously.
Conclusions
The study concluded that displacement activities occur in marine crabs in two different cases: the case of incompatible drives and the case of the activated and inhibited drive. Understanding these activities is essential for understanding the behavior of marine crabs and their adaptation to their environment.
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