首页|Daily activity rhythms,chronotypes,and risk-taking behavior in the signal crayfish
Daily activity rhythms,chronotypes,and risk-taking behavior in the signal crayfish
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Consistent inter-individual differences in daily activity rhythms(i.e.,chronotypes)can have eco-logical consequences in determining access to food resources and avoidance of predators.The most common measure to characterize chronotypes in animals as well as humans is the onset of activity(i.e.,early or late chronotypes).However,daily activity rhythms may also differ in the rela-tive amount of activity displayed at particular time periods.Moreover,chronotypes may also be linked to other consistent inter-individual differences in behavior(i.e.,personality),such as the pro-pensity to take risks.Here,we used the signal crayfish Pacifastacus leniusculus to test the presence of chronotypes and risk-taking personality traits and a potential behavioral syndrome between these traits.We first exposed crayfish to 5 days of light-darkness to measure daily activity rhythms and then we applied a visual predator-simulating stimulus in 2 different contexts(neutral and food).Our results showed consistent(i.e.,across 5 days)inter-individual differences in the relative nocturnal activity displayed in the early and middle,but not in the late part of darkness hours.Moreover,while crayfish displayed inter-individual differences in risk-taking behavior,these were not found to be consistent across 2 contexts.Therefore,we were not able to formally test a behav-ioral syndrome between these 2 traits.In conclusion,our study provides the first evidence of chronotypes in the relative amount of activity displayed at particular time periods.This could be a valuable information for applied ecological aspects related to the signal crayfish,which is a major invasive species of freshwater ecosystems.
Department of Marine Renewable Resources,Marine Science Institute(ICM-CSIC),Passeig Marítim de la Barceloneta,37,08003 Barcelona,Spain
Department of Biology and Ecology of Fishes,Leibniz-lnstitute of Freshwater Ecology and Inland Fisheries,Müggelseedamm 310,12587 Berlin,Germany
Department of Biological and Marine Sciences,University of Hull,Cottingham Road,Hull HU6 7RX,UK
a Leibniz-DAAD Postdoctoral Research FellowshipSpanish Ministry of Science and Innovation with a"Juan de la Cierva Incorporación"research fel-lowshipthe"Severo Ochoa Centre of Excellence"accreditation
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