Daily activity rhythms, chronotypes, and risk-taking behavior in the signal crayfish  

作　　者：Valerio SBRAGAGLIA Thomas BREITHAUPT 

机构地区：[1]Department of Marine Renewable Resources,Marine Science Institute(ICM-CSIC),Passeig Maritim de la Barceloneta,37,08003 Barcelona,Spain [2]Department of Biology and Ecology of Fishes,Leibniz-lnstitute of Freshwater Ecology and Inland Fisheries,Müggelseedamm 310,12587 Berlin,Germany [3]Department of Biological and Marine Sciences,University of Hull,Cottingham Road,Hull HU67RX,UK

出　　处：《Current Zoology》2022年第2期177-183,共7页动物学报（英文版）

基　　金：V.S.was supported by a Leibniz-DAAD Postdoctoral Research Fellowship(no.91632699);while he is now supported by the Spanish Ministry of Science and Innovation with a “Juan de la Cierva Incorporacion”research fellowship(IJC2018-035389-1);he acknowledges the “Severo Ochoa Centre of Excellence”accreditation(CEX2019-000928-S).

摘　　要：Consistent inter-individual differences in daily activity rhythms(i.e.,chronotypes)can have ecological 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 relative 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 propensity to take risks.Here,we used the signal crayfish Pacifastacus leniusculusto 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 behavioral 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.

关 键 词：behavioral syndrome biological rhythms BOLDNESS FEEDING locomotor activity 

分 类 号：Q95[生物学—动物学]