寄生对集团内捕食系统中物种共存的影响  

Effects of parasites on species coexistence in intraguild predation system

作　　者：周帅 苏敏[1] ZHOU Shuai;SU Min(School of Mathematics,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学数学学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2018年第4期564-569,共6页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(31770470);中央高校基本科研业务费专项资金资助项目(JZ2016HGTB0724)

摘　　要：寄生可通过间接效应调节物种间相互作用强度,从而对生态系统中种群动态及物种共存产生重要影响。文章基于生态-传染病模型,考虑寄生对种内竞争的特征调节作用,探讨了物种共存对寄生调节的易感染者和已感染者种内竞争的响应。研究结果表明,不同特征调节下的竞争力对物种共存产生不同影响,其中寄生调节导致易感染者相对较强的种内竞争对物种共存起促进作用,而寄生调节引起的已感染种群相对弱的种内竞争则不利于物种共存。同时,不同特征调节下的共存区域差别明显,强类间竞争时,共存区域最大;弱类间竞争时,共存区域最小。Parasitism can influence the population dynamics and species coexistence in ecosystem through parasite-mediated indirect effects on the host-parasite interactions.Based on eco-epidemiological models,how the parasite-mediated trait effects on intra-specific competition between susceptible and infected host individuals affect species coexistence in the intraguild predation(IGP)system are explored.Results show that various parasite-mediated intra-competition traits can produce different impacts on species coexistence.The parasite-mediated relatively strong inter-competition of susceptible host populations will promote the species coexistence in IGP system,while the parasite-induced reduction in inter-competition of infected host populations will inhibit the species coexistence.Meanwhile,various parasite-mediated traits may affect species coexistence in different ways:when inter-competition is strong,the parameters range for species coexistence is wide;but as inter-competition is weak,the parameters range for species coexistence is narrow.

关 键 词：宿主-寄生 种群动态 物种共存 种内竞争 特征调节 集团内捕食(IGP)系统 

分 类 号：Q141[生物学—生态学]