{"id":{"repo_id":"ohiolink","oai_identifier":"oai:etd.ohiolink.edu:ucin1346171602"},"canonical_url":"https://search.dev.ndltd.org/etd/ohiolink/oai:etd.ohiolink.edu:ucin1346171602","repository":{"repo_id":"ohiolink","name":"OhioLINK","base_url":"https://etd.ohiolink.edu/acprod/odb_etd/ws/oai/oai"},"display":{"title":"Spatial, temporal and spectral properties of photoreceptor cells in the fiddler crab Uca pugilator (Bosc, 1802)","abstract":"Uca pugilator are semi-terrestrial brachyuran fiddler crabs that inhabit inter-tidal sand and mud flats. They are social animals that rely exclusively on visual information during several of their behaviors that include mate choice, predator avoidance, burrow surveillance, courtship and territorial interactions. Through several behavioral and optical experiments, it has been previously shown that they have 360° viewing angle on each eye, high spatial resolution along their eye’s midline, improved resolution on the vertical axes and posses excellent optomotor stabilization mechanism. Such understanding of their retinal design has helped us realize that the eyes of fiddler crabs are adapted for specific visual tasks in their geometrically structured habitat. However, the physiological capabilities of this retina are not yet completely understood, especially at the photoreceptor level. The objective of my thesis has been to fill this gap in knowledge, and specifically determine the spatial, temporal and spectral properties of photoreceptor cells through an integrative approach, using several molecular and electrophysiological techniques. Through these experiments, I have shown that the spatial resolution of the eye is best along the eye´s midline (~1°), photoreceptor cells are capable of perceiving up to ~45Hz of flickering light stimuli and that they are capable of perceiving color cues including in the ultra-violet.","abstract_html":"Uca pugilator are semi-terrestrial brachyuran fiddler crabs that inhabit inter-tidal sand and mud flats. They are social animals that rely exclusively on visual information during several of their behaviors that include mate choice, predator avoidance, burrow surveillance, courtship and territorial interactions. Through several behavioral and optical experiments, it has been previously shown that they have 360° viewing angle on each eye, high spatial resolution along their eye’s midline, improved resolution on the vertical axes and posses excellent optomotor stabilization mechanism. Such understanding of their retinal design has helped us realize that the eyes of fiddler crabs are adapted for specific visual tasks in their geometrically structured habitat. However, the physiological capabilities of this retina are not yet completely understood, especially at the photoreceptor level. The objective of my thesis has been to fill this gap in knowledge, and specifically determine the spatial, temporal and spectral properties of photoreceptor cells through an integrative approach, using several molecular and electrophysiological techniques. Through these experiments, I have shown that the spatial resolution of the eye is best along the eye´s midline (~1°), photoreceptor cells are capable of perceiving up to ~45Hz of flickering light stimuli and that they are capable of perceiving color cues including in the ultra-violet.","abstract_has_math":false,"creators":["Rajkumar, Premraj"],"institution":"University of Cincinnati","degree_name":"PhD","degree_level":"doctoral","degree_discipline":"Arts and Sciences: Biological Sciences","degree_department":null,"school":null,"contributors":["Layne, John"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012","date_published":"2012","updated_at":"2026-07-24T03:36:23Z","subjects":["Biology","fiddler crab","eye","spatial","temporal","spectral","photoreceptors"],"languages":["English"],"rights":["unrestricted","This thesis or dissertation is protected by copyright: all rights reserved. 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Such understanding of their retinal design has helped us realize that the eyes of fiddler crabs are adapted for specific visual tasks in their geometrically structured habitat. However, the physiological capabilities of this retina are not yet completely understood, especially at the photoreceptor level. The objective of my thesis has been to fill this gap in knowledge, and specifically determine the spatial, temporal and spectral properties of photoreceptor cells through an integrative approach, using several molecular and electrophysiological techniques. Through these experiments, I have shown that the spatial resolution of the eye is best along the eye´s midline (~1°), photoreceptor cells are capable of perceiving up to ~45Hz of flickering light stimuli and that they are capable of perceiving color cues including in the ultra-violet."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf","p.119","3.81 MB"]},{"key":"dc:title","label":"Title","values":["Spatial, temporal and spectral properties of photoreceptor cells in the fiddler crab Uca pugilator (Bosc, 1802)"]}]}],"canonical_facts":{"dc:contributor":["Layne, John"],"dc:creator":["Rajkumar, Premraj"],"dc:date":["2012"],"dc:description":["Uca pugilator are semi-terrestrial brachyuran fiddler crabs that inhabit inter-tidal sand and mud flats. They are social animals that rely exclusively on visual information during several of their behaviors that include mate choice, predator avoidance, burrow surveillance, courtship and territorial interactions. Through several behavioral and optical experiments, it has been previously shown that they have 360° viewing angle on each eye, high spatial resolution along their eye’s midline, improved resolution on the vertical axes and posses excellent optomotor stabilization mechanism. Such understanding of their retinal design has helped us realize that the eyes of fiddler crabs are adapted for specific visual tasks in their geometrically structured habitat. However, the physiological capabilities of this retina are not yet completely understood, especially at the photoreceptor level. The objective of my thesis has been to fill this gap in knowledge, and specifically determine the spatial, temporal and spectral properties of photoreceptor cells through an integrative approach, using several molecular and electrophysiological techniques. Through these experiments, I have shown that the spatial resolution of the eye is best along the eye´s midline (~1°), photoreceptor cells are capable of perceiving up to ~45Hz of flickering light stimuli and that they are capable of perceiving color cues including in the ultra-violet."],"dc:format":["application/pdf","p.119","3.81 MB"],"dc:identifier":["http://rave.ohiolink.edu/etdc/view?acc_num=ucin1346171602"],"dc:language":["English"],"dc:publisher":["University of Cincinnati / OhioLINK"],"dc:rights":["unrestricted","This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws."],"dc:subject":["Biology","fiddler crab","eye","spatial","temporal","spectral","photoreceptors"],"dc:title":["Spatial, temporal and spectral properties of photoreceptor cells in the fiddler crab Uca pugilator (Bosc, 1802)"],"dc:type":["Electronic Thesis or Dissertation"],"thesis:degree_discipline":["Arts and Sciences: Biological Sciences"],"thesis:degree_level":["doctoral"],"thesis:degree_name":["PhD"],"thesis:institution_name":["University of Cincinnati"]},"updated_at":"2026-07-24T03:36:23Z"}