生态学报2017，Vol.37Issue(3)：1035-1042,8.DOI:10.5846/stxb201508281792
视野受阻对东方田鼠觅食行为的影响
Effects of vision obstruction on the foraging behavior in voles(Microtus fortis)
摘要
Abstract
The foraging behavior of small mammalian herbivores is the outcome of adaption to specific habitats.It is unknown whether vision obstruction caused by plants surrounding food patches affects foraging vigilance in small mammalian herbivores,resulting in variations in their intake rates.To evaluate the effects of the height of surrounding obstructs on the behavior sequence and intake rate of voles (Microtus fortis),we devised concentrated food patches of fresh leaves of clover (Trifolium repens) that were obstructed by three heights of brown paper to imitate the vegetation obstruction to vole vision around the food patches.The sequence and parameters of vole foraging behavior were measured to examine the effect of vegetation heights on their intake rate.No significant difference was detected in the foraging subject with different heights of obstruction in foraging behavior.The dynamic analysis of variation in foraging behavior parameters showed that in each biting bout,individuals maintained the total foraging interruption time by modulating the frequency and duration of vigilance behavior in each foraging bout,thus maintaining a steady ingestion time.The results also indicated that the voles maintained their intake rates at different levels of vision obstruction via altering and optimizing their behavior.These results verified the instantaneously dynamic change of energy gain by measuring the actual foraging interruption time caused by vigilant behavior.The variation in vigilance intensity,i.e.,vigilance frequency,in voles did not reflect the cost of decreasing food intake caused by foraging interruption,rather the duration of vigilance action in foraging processes was a reliable indicator of dynamic change in intake rates.Consequently,investigating the effects of vigilance behavior on intake rates by measuring the foraging cost caused by the foraging interruption time as an indicator could be an effective way to evaluate adaptive foraging strategies in different situations in small mammalian herbivores.关键词
视野受阻/东方田鼠/觅食行为/警觉/摄入率Key words
vision obstruction/Microtus fortis/foraging behavior/vigilance/intake rate引用本文复制引用
唐显江,陶双伦,马静,章力,吴帅玲,李俊年..视野受阻对东方田鼠觅食行为的影响[J].生态学报,2017,37(3):1035-1042,8.基金项目
国家自然科学基金资助项目(31460097) （31460097）
喀斯特草地生态系统研究生培养创新基地项目 （）
吉首大学校级科研资助项目(JGY201516) （JGY201516）
