Document Detail


Tidal, daily, and lunar-day activity cycles in the marine polychaete Nereis virens.
MedLine Citation:
PMID:  19212835     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The burrow emergence activity of the wild caught ragworm Nereis virens Sars associated with food prospecting was investigated under various photoperiodic (LD) and simulated tidal cycles (STC) using a laboratory based actograph. Just over half (57%) of the animals under LD with STC displayed significant tidal (approximately 12.4 h) and/or lunar-day (approximately 24.8 h) activity patterns. Under constant light (LL) plus a STC, 25% of all animals were tidal, while one animal responded with a circadian (24.2 h) activity rhythm suggestive of cross-modal entrainment where the environmental stimulus of one period entrains rhythmic behavior of a different period. All peaks of activity under a STC, apart from that of the individual cross-modal entrainment case, coincided with the period of tank flooding. Under only LD without a STC, 49% of the animals showed nocturnal (approximately 24 h) activity. When animals were maintained under free-running LL conditions, 15% displayed significant rhythmicity with circatidal and circadian/circalunidian periodicities. Although activity cycles in N. virens at the population level are robust, at the individual level they are particularly labile, suggesting complex biological clock-control with multiple clock output pathways.
Authors:
Kim S Last; Thierry Bailhache; Cas Kramer; Charalambos P Kyriacou; Ezio Rosato; Peter J W Olive
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Chronobiology international     Volume:  26     ISSN:  1525-6073     ISO Abbreviation:  Chronobiol. Int.     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2009-02-12     Completed Date:  2009-04-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8501362     Medline TA:  Chronobiol Int     Country:  United States    
Other Details:
Languages:  eng     Pagination:  167-83     Citation Subset:  IM    
Affiliation:
The Scottish Association for Marine Science, Dunstaffnage Marine Laboratory, Oban, UK. kim.last@sams.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Animals
Behavior, Animal / physiology*
Biological Clocks / physiology*
Circadian Rhythm / physiology*
Moon*
Photoperiod
Polychaeta / physiology*
Tidal Waves*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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