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Introduction: Neohelice granulata crabs live in mudflats where they prey upon smaller crabs. Predatory behavior can be elicited in the laboratory by a dummy moving at ground level in an artificial arena. Previous research found that crabs do not use apparent dummy size nor its retinal speed as a criterion to initiate attacks, relying instead on actual size and distance to the target. To estimate the distance to an object on the ground, Neohelice could rely on angular declination below the horizon or, since they are broad-fronted with eye stalks far apart, on stereopsis. Unlike other animals, binocular vision does not widen the visual field of crabs since they already cover 360◦ monocularly. There exist nonetheless areas of the eye with increased resolution. Methods: We tested how predatory responses towards the dummy changed when animals’ vision was monocular (one eye occluded by opaque black paint) compared to binocular. Results: Even though monocular crabs could still perform predatory behaviors, we found a steep reduction in the number of attacks. Predatory performance defined by the probability of completing the attacks and the success rate (the probability of making contact with the dummy once the attack was initiated) was impaired too. Monocular crabs tended to use frontal, ballistic jumps (lunge behavior) less, and the accuracy of those attacks was reduced. Monocular crabs used prey interception (moving toward the dummy while it approached the crab) more frequently, favoring attacks when the dummy was ipsilateral to the viewing eye. Instead, binocular crabs’ responses were balanced in the right and left hemifields. Both groups mainly approached the dummy using the lateral field of view, securing speed of response. Conclusion: Although two eyes are not strictly necessary for eliciting predatory responses, binocularity is associated with more frequent and precise attacks.


Documento: Artículo
Título:Predatory behavior under monocular and binocular conditions in the semiterrestrial crab Neohelice granulata
Autor:Harper, Thomas; Nemirovsky, Sergio Iván; Tomsic, Daniel; Sztarker, Julieta
Filiación:Universidad de Buenos Aires. Departamento de Fisiología, Biología Molecular y Celular; Argentina
Universidad de Buenos Aires - CONICET. Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE); Argentina
Universidad de Buenos Aires - CONICET. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales (IQUIBICEN); Argentina
Palabras clave:Binocular Integration; Eye Occlusion; Crustacean; Predatory Strategy; Stereopsis
Página de inicio:1
Página de fin:11
Título revista:Frontiers in Behavioral Neuroscience
Título revista abreviado:Front. Behav. Neurosci.


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---------- APA ----------
Harper, Thomas, Nemirovsky, Sergio Iván, Tomsic, Daniel & Sztarker, Julieta (2023) . Predatory behavior under monocular and binocular conditions in the semiterrestrial crab Neohelice granulata. Frontiers in Behavioral Neuroscience, 17, 1-11.
---------- CHICAGO ----------
Harper, Thomas, Nemirovsky, Sergio Iván, Tomsic, Daniel, Sztarker, Julieta. "Predatory behavior under monocular and binocular conditions in the semiterrestrial crab Neohelice granulata" . Frontiers in Behavioral Neuroscience 17 (2023) : 1-11.
---------- MLA ----------
Harper, Thomas, Nemirovsky, Sergio Iván, Tomsic, Daniel, Sztarker, Julieta. "Predatory behavior under monocular and binocular conditions in the semiterrestrial crab Neohelice granulata" . Frontiers in Behavioral Neuroscience, vol. 17, 2023, pp. 1-11.
---------- VANCOUVER ----------
Harper, Thomas, Nemirovsky, Sergio Iván, Tomsic, Daniel, Sztarker, Julieta. Predatory behavior under monocular and binocular conditions in the semiterrestrial crab Neohelice granulata. Front. Behav. Neurosci. 2023;17:1-11.