HPI reactivity does not reflect changes in personality among trout introduced to bold or shy social groups

2016 Behaviour  
Article (refereed) -postprint Thomson, Jack S.; Watts, Phillip C.; Pottinger, Tom G.; Sneddon, Lynne U. 2016. HPI reactivity does not reflect changes in personality among trout introduced to bold or shy social groups. Behaviour, 153 (Summary 25 Physiological stress responses often correlate with personalities (e.g. boldness). However, 26 this relationship can become decoupled, although the mechanisms underlying changes in this 27 relationship are poorly understood. Here we quantify (1) how an
more » ... antify (1) how an individual's boldness 28 (response to novel objects) in rainbow trout, Oncorhynchus mykiss, changes in response to 29 interactions with a population of either bold or shy conspecifics and we (2) measured 30 associated post-stress cortisol levels. Initially-bold trout became shyer regardless of group 31 composition, whereas shy trout remained shy demonstrating that bold individuals are more 32 plastic. Stress-induced plasma cortisol reflected the original personality of fish but not the 33 personality induced by the treatment, irrespective of population personality. Change in 34 boldness of bold trout may indicate preference towards initially subordinate behaviour when 35 joining a new population. However, here we provide further evidence that behavioural and 36 physiological parameters of coping styles may become uncoupled whereby behavioural 37 changes are not correlated with stress responsiveness. 38 39
doi:10.1163/1568539x-00003398 fatcat:wuqk3cakj5c3fp435kjcyerlpy