Role of locust Locusta migratoria manilensis claws and pads in attaching to substrates  

作　　者：WANG LiXin ZHOU Qiang XU ShuYan 

机构地区：[1]Department of Mechatronic Engineering, China Agricultural University, Beijing 100083, China

出　　处：《Chinese Science Bulletin》2011年第8期789-795,共7页

基　　金：supported by the National Natural Science Foundation of China (50775214);the Fundamental Research Funds of China Agricul-tural University for Special Post-graduate Research and Innovation Funding (kycx09099)

摘　　要：The present study attempts to investigate the role of rigid claws and smooth adhesive pads in the locust Locusta migratoria manilensis,when attaching to various substrates.We measured the attachment forces on sandpaper and silicate glass plate of locusts with intact attachment system,and those with either the pretarsal claws or the tarsal pads having been entirely destroyed,to explore the role of pads and claws when a locust is walking on various substrates.To obtain information about morphological characteristics and material properties of the claws,we examined the intact and fractured claws by scanning electron microscopy,and tested the fractural force in a fracture experiment.We proposed a mechanical model for locust climbing on a slanting surface to analyze the conduction and final result of the attachment forces generated by the attachment organs on the fore-,mid-and hindlegs.Attachment forces generated by locusts with destroyed pads were similar to those generated by locusts with intact attachment system on both substrates,which presumably indicated that the claws have a significantly important role when attaching to various substrates.The result of the fracture experiment demonstrated that the claws are made of relatively stiff material,and their shear strength ranged between 39-45 MPa.Mechanical analysis of locust climbing on slanting surface showed that the force generated by the hindlegs suspended the whole body of locust up from the surface and pushed the body forward,while the midlegs steadily suspended the centre of gravity and the forelegs pulled the suspended body forward.The results obtained contribute to the further interpretation of the interaction mechanisms between insect attachment system and substrates,and supply information for designing and manufacturing slippery plates for trapping plague locusts.The present study attempts to investigate the role of rigid claws and smooth adhesive pads in the locust Locusta migratoria manilensis, when attaching to various substrates. We measured the attachment forces on sandpaper and silicate glass plate of lo- custs with intact attachment system, and those with either the pretarsal claws or the tarsal pads having been entirely destroyed, to explore the role of pads and claws when a locust is walking on various substrates. To obtain information about morphological characteristics and material properties of the claws, we examined the intact and fractured claws by scanning electron microscopy, and tested the fractural force in a fracture experiment. We proposed a mechanical model for locust climbing on a slanting surface to analyze the conduction and final result of the attachment forces generated by the attachment organs on the fore-, mid- and hindlegs. Attachment forces generated by locusts with destroyed pads were similar to those generated by locusts with intact at- tachment system on both substrates, which presumably indicated that the claws have a significantly important role when attaching to various substrates. The result of the fracture experiment demonstrated that the claws are made of relatively stiff material, and their shear strength ranged between 3945 MPa. Mechanical analysis of locust climbing on slanting surface showed that the force generated by the hindlegs suspended the whole body of locust up from the surface and pushed the body forward, while the midlegs steadily suspended the centre of gravity and the forelegs pulled the suspended body forward. The results obtained con- tribute to the further interpretation of the interaction mechanisms between insect attachment system and substrates, and supply information for designing and manufacturing slippery plates for trapping plague locusts.

关 键 词：东亚飞蝗 蝗虫 基板 扫描电子显微镜 附件系统 断裂实验 信息材料 力学模型 

分 类 号：TQ63[化学工程—精细化工] S433.2[农业科学—农业昆虫与害虫防治]