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Entrainment of the circadian rhythm of the supratidal amphipod Talorchestia longicornis by light and temperature: Mechanisms of detection and hierarchical organization

Publication ,  Journal Article
Forward, RB; Bourla, MH; Zachary Darnell, M; Cohen, JH
Published in: Marine and Freshwater Behaviour and Physiology
July 1, 2009

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 entrain- ment 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 deter- mined by monitoring temporal changes in surface activity using a video system, and assessed as the number of animals active on a sand substrate at 0.5h 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 520nm, 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. © 2009 Taylor & Francis.

Duke Scholars

Published In

Marine and Freshwater Behaviour and Physiology

DOI

EISSN

1029-0362

ISSN

1023-6244

Publication Date

July 1, 2009

Volume

42

Issue

4

Start / End Page

233 / 247

Related Subject Headings

  • Marine Biology & Hydrobiology
  • 31 Biological sciences
  • 06 Biological Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Forward, R. B., Bourla, M. H., Zachary Darnell, M., & Cohen, J. H. (2009). Entrainment of the circadian rhythm of the supratidal amphipod Talorchestia longicornis by light and temperature: Mechanisms of detection and hierarchical organization. Marine and Freshwater Behaviour and Physiology, 42(4), 233–247. https://doi.org/10.1080/10236240903162268
Forward, R. B., M. H. Bourla, M. Zachary Darnell, and J. H. Cohen. “Entrainment of the circadian rhythm of the supratidal amphipod Talorchestia longicornis by light and temperature: Mechanisms of detection and hierarchical organization.” Marine and Freshwater Behaviour and Physiology 42, no. 4 (July 1, 2009): 233–47. https://doi.org/10.1080/10236240903162268.
Forward RB, Bourla MH, Zachary Darnell M, Cohen JH. Entrainment of the circadian rhythm of the supratidal amphipod Talorchestia longicornis by light and temperature: Mechanisms of detection and hierarchical organization. Marine and Freshwater Behaviour and Physiology. 2009 Jul 1;42(4):233–47.
Forward, R. B., et al. “Entrainment of the circadian rhythm of the supratidal amphipod Talorchestia longicornis by light and temperature: Mechanisms of detection and hierarchical organization.” Marine and Freshwater Behaviour and Physiology, vol. 42, no. 4, July 2009, pp. 233–47. Scopus, doi:10.1080/10236240903162268.
Forward RB, Bourla MH, Zachary Darnell M, Cohen JH. Entrainment of the circadian rhythm of the supratidal amphipod Talorchestia longicornis by light and temperature: Mechanisms of detection and hierarchical organization. Marine and Freshwater Behaviour and Physiology. 2009 Jul 1;42(4):233–247.

Published In

Marine and Freshwater Behaviour and Physiology

DOI

EISSN

1029-0362

ISSN

1023-6244

Publication Date

July 1, 2009

Volume

42

Issue

4

Start / End Page

233 / 247

Related Subject Headings

  • Marine Biology & Hydrobiology
  • 31 Biological sciences
  • 06 Biological Sciences