Predatory behavior under monocular and binocular conditions in the semiterrestrial crab Neohelice granulata
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 cri...
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| Formato: | Artículo publishedVersion |
| Lenguaje: | Inglés |
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2023
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_16625153_v17_n_p1_Harper http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_16625153_v17_n_p1_Harper_oai |
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I28-R145-paper_16625153_v17_n_p1_Harper_oai2023-08-30 Harper, Thomas Nemirovsky, Sergio Iván Tomsic, Daniel Sztarker, Julieta 2023 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. Fil: Harper, Thomas. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil: Nemirovsky, Sergio Iván. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil: Tomsic, Daniel. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil: Sztarker, Julieta. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_16625153_v17_n_p1_Harper eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Front. Behav. Neurosci. 2023;(17) Binocular Integration Eye Occlusion Crustacean Predatory Strategy Stereopsis Predatory behavior under monocular and binocular conditions in the semiterrestrial crab Neohelice granulata info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_16625153_v17_n_p1_Harper_oai |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-145 |
| collection |
Repositorio Digital de la Universidad de Buenos Aires (UBA) |
| language |
Inglés |
| orig_language_str_mv |
eng |
| topic |
Binocular Integration Eye Occlusion Crustacean Predatory Strategy Stereopsis |
| spellingShingle |
Binocular Integration Eye Occlusion Crustacean Predatory Strategy Stereopsis Harper, Thomas Nemirovsky, Sergio Iván Tomsic, Daniel Sztarker, Julieta Predatory behavior under monocular and binocular conditions in the semiterrestrial crab Neohelice granulata |
| topic_facet |
Binocular Integration Eye Occlusion Crustacean Predatory Strategy Stereopsis |
| description |
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. |
| format |
Artículo Artículo publishedVersion |
| author |
Harper, Thomas Nemirovsky, Sergio Iván Tomsic, Daniel Sztarker, Julieta |
| author_facet |
Harper, Thomas Nemirovsky, Sergio Iván Tomsic, Daniel Sztarker, Julieta |
| author_sort |
Harper, Thomas |
| title |
Predatory behavior under monocular and binocular conditions in the semiterrestrial crab Neohelice granulata |
| title_short |
Predatory behavior under monocular and binocular conditions in the semiterrestrial crab Neohelice granulata |
| title_full |
Predatory behavior under monocular and binocular conditions in the semiterrestrial crab Neohelice granulata |
| title_fullStr |
Predatory behavior under monocular and binocular conditions in the semiterrestrial crab Neohelice granulata |
| title_full_unstemmed |
Predatory behavior under monocular and binocular conditions in the semiterrestrial crab Neohelice granulata |
| title_sort |
predatory behavior under monocular and binocular conditions in the semiterrestrial crab neohelice granulata |
| publishDate |
2023 |
| url |
http://hdl.handle.net/20.500.12110/paper_16625153_v17_n_p1_Harper http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_16625153_v17_n_p1_Harper_oai |
| work_keys_str_mv |
AT harperthomas predatorybehaviorundermonocularandbinocularconditionsinthesemiterrestrialcrabneohelicegranulata AT nemirovskysergioivan predatorybehaviorundermonocularandbinocularconditionsinthesemiterrestrialcrabneohelicegranulata AT tomsicdaniel predatorybehaviorundermonocularandbinocularconditionsinthesemiterrestrialcrabneohelicegranulata AT sztarkerjulieta predatorybehaviorundermonocularandbinocularconditionsinthesemiterrestrialcrabneohelicegranulata |
| _version_ |
1782033728071008256 |