Entrainment of the circadian rhythm of the supratidal amphipod Talorchestia longicornis by light and temperature: mechanisms of detection and hierarchical organization.
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| Title: | Entrainment of the circadian rhythm of the supratidal amphipod Talorchestia longicornis by light and temperature: mechanisms of detection and hierarchical organization. |
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| Authors: | Forward, Richard B. (AUTHOR), Bourla, Michael H. (AUTHOR), Darnell, M. Zachary (AUTHOR), Cohen, Jonathan H. (AUTHOR) |
| Source: | Marine & Freshwater Behaviour & Physiology. Jul2009, Vol. 42 Issue 4, p233-247. 15p. 6 Graphs. |
| Subjects: | Amphipoda, Circadian rhythms, Visual pigments, Temperature, Photoreceptors |
| Abstract: | The amphipod Talorchestia longicornis is active on the substrate surface during the night and inactive in its burrows during the day. The underlying circadian rhythm in activity can be entrained by the light : dark cycle. This study considered other aspects of entrainment, such as: whether the compound eyes or extraocular photoreceptors are used to detect entrainment cues, which visual pigment mediates the entrainment process, whether entrainment can also occur in response to diel temperature cycles and whether when presented with conflicting entrainment cues, the light : dark or temperature cycle dominates for entrainment. Entrainment was determined by monitoring temporal changes in surface activity using a video system, and assessed as the number of animals active on a sand substrate at 0.5 h intervals. The compound eyes and not extraocular photoreceptors are used for entrainment to the light : dark cycle. Although T. longicornis has two visual pigments with absorption maxima near 420 and 520 nm, entrainment occurred only by light that simulated the 520 nm absorbing pigment, perhaps because its absorption is matched to the spectrum of ambient light at twilight. The rhythm is also entrained by a diel temperature cycle. If amphipods are simultaneously exposed to a temperature and light : dark cycles phased differently, they entrain to the temperature cycle. These results suggest that for a burrowing amphipod, diel temperature cycles may be a more reliable indicator of environmental conditions than light cycles. [ABSTRACT FROM AUTHOR] |
| Copyright of Marine & Freshwater Behaviour & Physiology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Psychology and Behavioral Sciences Collection |
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| Header | DbId: pbh DbLabel: Psychology and Behavioral Sciences Collection An: 44014652 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Entrainment of the circadian rhythm of the supratidal amphipod Talorchestia longicornis by light and temperature: mechanisms of detection and hierarchical organization. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Forward%2C+Richard+B%2E%22">Forward, Richard B.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bourla%2C+Michael+H%2E%22">Bourla, Michael H.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Darnell%2C+M%2E+Zachary%22">Darnell, M. Zachary</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cohen%2C+Jonathan+H%2E%22">Cohen, Jonathan H.</searchLink> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Marine+%26+Freshwater+Behaviour+%26+Physiology%22">Marine & Freshwater Behaviour & Physiology</searchLink>. Jul2009, Vol. 42 Issue 4, p233-247. 15p. 6 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Amphipoda%22">Amphipoda</searchLink><br /><searchLink fieldCode="DE" term="%22Circadian+rhythms%22">Circadian rhythms</searchLink><br /><searchLink fieldCode="DE" term="%22Visual+pigments%22">Visual pigments</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature%22">Temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Photoreceptors%22">Photoreceptors</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The amphipod Talorchestia longicornis is active on the substrate surface during the night and inactive in its burrows during the day. The underlying circadian rhythm in activity can be entrained by the light : dark cycle. This study considered other aspects of entrainment, such as: whether the compound eyes or extraocular photoreceptors are used to detect entrainment cues, which visual pigment mediates the entrainment process, whether entrainment can also occur in response to diel temperature cycles and whether when presented with conflicting entrainment cues, the light : dark or temperature cycle dominates for entrainment. Entrainment was determined by monitoring temporal changes in surface activity using a video system, and assessed as the number of animals active on a sand substrate at 0.5 h intervals. The compound eyes and not extraocular photoreceptors are used for entrainment to the light : dark cycle. Although T. longicornis has two visual pigments with absorption maxima near 420 and 520 nm, entrainment occurred only by light that simulated the 520 nm absorbing pigment, perhaps because its absorption is matched to the spectrum of ambient light at twilight. The rhythm is also entrained by a diel temperature cycle. If amphipods are simultaneously exposed to a temperature and light : dark cycles phased differently, they entrain to the temperature cycle. These results suggest that for a burrowing amphipod, diel temperature cycles may be a more reliable indicator of environmental conditions than light cycles. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Marine & Freshwater Behaviour & Physiology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=pbh&AN=44014652 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1080/10236240903162268 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 233 Subjects: – SubjectFull: Amphipoda Type: general – SubjectFull: Circadian rhythms Type: general – SubjectFull: Visual pigments Type: general – SubjectFull: Temperature Type: general – SubjectFull: Photoreceptors Type: general Titles: – TitleFull: Entrainment of the circadian rhythm of the supratidal amphipod Talorchestia longicornis by light and temperature: mechanisms of detection and hierarchical organization. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Forward, Richard B. – PersonEntity: Name: NameFull: Bourla, Michael H. – PersonEntity: Name: NameFull: Darnell, M. Zachary – PersonEntity: Name: NameFull: Cohen, Jonathan H. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: Jul2009 Type: published Y: 2009 Identifiers: – Type: issn-print Value: 10236244 Numbering: – Type: volume Value: 42 – Type: issue Value: 4 Titles: – TitleFull: Marine & Freshwater Behaviour & Physiology Type: main |
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