期刊文献+

Influence of supraphysiological cortisol manipulation on predator avoidance behaviors and physiological responses to a predation threat in a wild marine teleost fish

原文传递
导出
摘要 The stress axis in teleost fish attempts to maintain internal homeostasis in the face of allostatic loading.However,stress axis induction has been associated with a higher predation rate in fish.To date,the physiological and behavioral factors associated with this outcome are poorly understood.The purpose of the present study was to investigate the impact of experimental cortisol elevation on anti-predator behavior and physiological responses to predator presence.We hypothesized that semi-chronic cortisol elevation would increase susceptibility to predation by increasing stress-induced risk-taking behaviors.To test this hypothesis,schoolmaster snapper were given cocoa butter implants without cortisol(sham)or with cortisol(50 mg/kg body weight)and tethered to cover.Fish were exposed to either a lemon shark or control conditions for 15-min.Space use and activity were recorded throughout and fish were terminally sampled for blood.Cortisol implantation,relative to shams,resulted in higher blood glucose and plasma cortisol concentrations with a lower plasma lactate concentration.Shark exposure,relative to controls,elicited higher blood glucose and lactate concentrations but had no effect on plasma cortisol concentration.No interactions were detected between shark exposure and cortisol treatment for any physiological trait.Behavioral metrics,including shelter use and activity,were unaffected by either cortisol implantation or shark exposure.Physiological responses to cortisol implantation likely resulted from enhanced gluconeogenic activity,whereas alterations under predator exposure may have been the product of catecholamine mobilization.Further work should address context-specific influences of stress in mediating behavioral responses to predation.
出处 《Integrative Zoology》 SCIE CSCD 2018年第2期206-218,共13页 整合动物学(英文版)
基金 M.J.Lawrence is supported by an NSERC PGS-D.S.J Cooke is supported by NSERC and the Canada Research Chairs Program E.J.Eliason was supported by an NSERC PDF J.W.Brownscombe is supported by NSERC and The Berkeley Marine Conservation Fellowship from The American Fisheries Society K.M.Gilmour is supported by NSERC J.W.Mandelman is supported by the New England Aquarium.
  • 相关文献

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部