Escape by inking and secreting: marine molluscs avoid predators through a rich array of chemicals and mechanisms.
Inking by marine molluscs such as sea hares, cuttlefish, squid, and octopuses is a striking behavior that is ideal for neuroecological explorations. While inking is generally thought to be used in active defense against predators, experimental evidence for this view is either scant or lacks mechanistic explanations. Does ink act through the visual or chemical modality? If inking is a chemical defense, how does it function and how does it affect the chemosensory systems of predators? Does it facilitate escape not only by acting directly on predators but also by being an alarm signal for conspecifics? This review examines these issues, within a broader context of passive and active chemical defensive secretions. It focuses on recent work on mechanisms of defense by inking in sea hares (Aplysia) and extends what we have learned about sea hares to other molluscs including the cephalopods.
Derby
Charles D
CD
Department of Biology, Brains & Behavior Program, and Center for Behavioral Neuroscience, Georgia State University, Atlanta, Georgia 30302-4010, USA. cderby@gsu.edu
D000818:Animals; D001048:Aplysia / Q000502:physiology; D001522:Behavior, Animal; D004924:Escape Reaction; D019143:Evolution, Molecular; D050830:L-Amino Acid Oxidase / Q000378:metabolism; D008974:Mollusca / Q000502:physiology*; D010675:Pheromones / Q000378:metabolism; D011235:Predatory Behavior
D010675:Pheromones; D050830:L-Amino Acid Oxidase