Abstract: In this study,Polyrhachis vicina was acclimated at 15,20,25 and 30 ℃ under a 14 L∶10 D dark-light cycle for 2 weeks,aiming to evaluate its thermal adaptation,and the thermal dependence of its locomotor performance.Preferred temperature (PT),critical high temperature (CHT),and critical low temperature (CLT) were measured by using a thermal gradient apparatus,and pause frequency (PF),sprint speed (SS) and maximum distance covered by continuous locomotion (MDCCL) were selected as the locomotor parameters of P.vicina.The results showed that acclimation temperature had significant effects on the PF,CHT,CLT,SS,PF and MDCCL,and all the indices except PF were positively correlated with acclimation temperature.The final preferendum was about 30.54 ℃,CHT was not higher than 45 ℃,and CLT was not lower than 3 ℃.P.vicina acclimated at higher temperature had an enhanced locomotor performance,relative to that acclimated at lower temperature.

Key words: Leymus chinensis, Clonal population, Matter production and storage, Restoration succession, Flooded meadow