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FUNCTIONAL RESPONSE PATTERS OF INSTANTANEOUS INTAKE RATE FOR ROOT VOLE (MICROTUS OECONOMUS)TO THE SET OF PLANT AVAILABILITY

TAO Shuanglun,LIU Jike,DU Yurong,LI Junnian, MA Jianbin   

  • Online:2006-06-01 Published:2008-07-07

根田鼠瞬时摄入率对植物可利用性变量集功能反应的格局

陶双伦 刘季科 都玉蓉 李俊年 马建滨   

  1. 中国科学院西北高原生物研究所, 西宁

Abstract: The effects of the set of alfalfa leaf availability variables,biomass density and leaf density and leaf size on the patterns of instantaneous intake rates of root voles,Microtus oeconomus were measured on the fresh alfalfa leaf patches by random-blocked design in laboratory. Leaf size had a significant effect on the voles intake rates (P<0.01),While leaf size and biomass density had no effects (P>0.05). We observed over two fold increase in intake rates in response to increased bite size (P<0.01). The regression between the observed and predicted intake rates was significant (P<0.01). These results indicated that leaf as a surrogate for bite is a main variable, so we tested the hypotheses that plant size is mammalian herbivores bite size surrogator, and that plant size as an independent variable influence on mammalian herbivores bite size.

Key words: Root voles(Microtus oeconomus), Instantaneous intake rate, Set of plant availability variables, Bite size, Functional response

摘要: 在实验窜条件下,以随机区组设计的新鲜紫花苜蓿叶片斑块,测定苜蓿叶片可利用性变量,叶片密度、生物量密度和叶片大小对根田鼠瞬时摄人率的作用格局。苜蓿叶片大小对根田鼠摄入率具有显著作用(P﹤0.01),而叶片密度与生物量作用则不显著(P>0.05);根田鼠摄入率对其口量变化能作出2倍以上的反应(P<0.01);观测摄入率与模型预测摄入率的回归显著(P<0.01)。 研究结果证明,以叶片大小替代根田鼠口量是影响其摄入率的独立变量;检验了植物大小是替代植食性哺乳动物口量的有效变量,以及植物大小是影响植食性哺乳动物摄入率潜在独立变量的假设。

关键词: 根田鼠, 瞬时摄入率, 植物可利用性变量集, 口量, 功能反应