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dc.contributor.authorTamm, Sidney L.  Concept link
dc.date.accessioned2015-11-09T20:36:06Z
dc.date.available2015-11-09T20:36:06Z
dc.date.issued2015-10-01
dc.identifier.citationBiological Bulletin 229 (2015): 173-184en_US
dc.identifier.urihttps://hdl.handle.net/1912/7620
dc.descriptionAuthor Posting. © Marine Biological Laboratory, 2015. This article is posted here by permission of Marine Biological Laboratory for personal use, not for redistribution. The definitive version was published in Biological Bulletin 229 (2015): 173-184.en_US
dc.description.abstractCtenophores, or comb jellies, are geotactic with a statocyst that controls the activity of the eight ciliary comb rows. If a ctenophore is tilted or displaced from a position of vertical balance, it rights itself by asymmetric frequencies of beating on the uppermost and lowermost comb rows, turning to swim up or down depending on its mood. I recently discovered that the statocyst of ctenophores has an asymmetric architecture related to the sagittal and tentacular planes along the oral-aboral axis. The four groups of pacemaker balancer cilia are arranged in a rectangle along the tentacular plane, and support a superellipsoidal statolith elongated in the tentacular plane. By controlled tilting of immobilized ctenophores in either body plane with video recording of activated comb rows, I found that higher beat frequencies occurred in the sagittal than in the tentacular plane at orthogonal orientations. Similar tilting experiments on isolated statocyst slices showed that statolith displacement due to gravity and the resulting deflection of the mechanoresponsive balancers are greater in the sagittal plane. Finally, tilting experiments on a mechanical model gave results similar to those of real statocysts, indicating that the geometric asymmetries of statolith design are sufficient to account for my findings. The asymmetric architecture of the ctenophore statocyst thus has functional consequences, but a possible adaptive value is not known.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherMarine Biological Laboratoryen_US
dc.relation.urihttps://doi.org/10.1086/BBLv229n2p173
dc.titleFunctional consequences of the asymmetric architecture of the ctenophore statocysten_US
dc.typeArticleen_US
dc.identifier.doi10.1086/BBLv229n2p173


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