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dc.contributor.authorAguzzi, Jacopo-
dc.contributor.authorSarriá, David-
dc.contributor.authorGarcía, José A.-
dc.contributor.authorRío, Joaquín del-
dc.contributor.authorSardà, Francisco-
dc.contributor.authorMànuel, Antoni-
dc.identifier.citationJournal of Neuroscience Methods 173(2): 215–224 (2008)en_US
dc.description10 pages, 7 figures, 1 tableen_US
dc.description.abstractTheNorway lobster,Nephrops norvegicus (L.), is a deep-water burrowing decapod of highcommercial value. Diel variations in trawl captures are produced by population rhythms of burrow emergences related to day–night cycles. Rhythms seem to be different in males and females since catches showvariations in sex ratios depending on the season. Our hypothesis is that the diel rhythm of activity in this species can be distinguished in three different behavioural sets, the durations of which showgender-related modulation: door-keeping, proximal-, and distal-emergence from the burrow. Our aim is to detail the functioning of a new tracking system allowing the durations of these three behavioural components to be determined. Movement of animals was detected by subdividing aquaria into different zones by means of three rows of infrared-emitting and -receiving photodiodes in which blue light emitters were also integrated for the generation of light cycles. We recorded movement patterns in adult males and females (n = 20) exposed to a standard photoperiod regime (i.e., 12 h; monochromatic at 480 nm of 5 lx) over 12 days. Marked diel nocturnal rhythms were reported at all barriers, with activity peaks diffused over the night at the burrow entrance and located at the day–night transition at other barriers (i.e., crepuscular peaks that decreased in the next fewhours of darkness). Mean total activitywas significantly higher for females than males at the burrow entrance (i.e., door-keeping behaviour). Males had significantly higher activity at other locations (proximal- and distal-emergence behaviours).en_US
dc.description.sponsorshipAcknowledgements All authors gave their informed consent prior to their inclusion in the study. Animal experiments followed the principles of laboratory animal care of the European Communities Council Directive of 24 November 1986 (86/609/EEC). This work was financed by the NORIT project (CTM20055-02034/MAR), funded by the Spanish Ministry of Education (CYCT, MEC). Jacopo Aguzzi is a postdoctoral fellow of the “Juan de la Cierva” Program (Education and Science Ministry-MEC, Spain).en_US
dc.subjectNephrops norvegicusen_US
dc.subjectMovement patternsen_US
dc.subjectBurrow emergenceen_US
dc.subjectTracking systemen_US
dc.subjectBlue light cycleen_US
dc.subjectCircadian rhythmsen_US
dc.subjectIR-automated tracking systemen_US
dc.titleA new tracking system for the measurement of diel locomotor rhythms in the Norway lobster, Nephrops norvegicus (L.)en_US
dc.description.peerreviewedPeer revieweden_US
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