In recent years,Meloidogyne enterolobii has emerged as a major parasitic nematode infesting many plants in tropical or subtropical areas.However,the regions of potential distribution and the main contributing environm...In recent years,Meloidogyne enterolobii has emerged as a major parasitic nematode infesting many plants in tropical or subtropical areas.However,the regions of potential distribution and the main contributing environmental variables for this nematode are unclear.Under the current climate scenario,we predicted the potential geographic distributions of M.enterolobii worldwide and in China using a Maximum Entropy(MaxEnt)model with the occurrence data of this species.Furthermore,the potential distributions of M.enterolobii were projected under three future climate scenarios(BCC-CSM2-MR,CanESM5 and CNRM-CM6-1)for the periods 2050s and 2090s.Changes in the potential distribution were also predicted under different climate conditions.The results showed that highly suitable regions for M.enterolobii were concentrated in Africa,South America,Asia,and North America between latitudes 30°S to 30°N.Bio16(precipitation of the wettest quarter),bio10(mean temperature of the warmest quarter),and bio11(mean temperature of the coldest quarter)were the variables contributing most in predicting potential distributions of M.enterolobii.In addition,the potential suitable areas for M.enterolobii will shift toward higher latitudes under future climate scenarios.This study provides a theoretical basis for controlling and managing this nematode.展开更多
The moving behaviors of a prolate spheroidal complex with the controllable rotation in an ideal fluid without vortex shedding are investigated to find out the self-propelled mechanism of a non-spherical swimmer via th...The moving behaviors of a prolate spheroidal complex with the controllable rotation in an ideal fluid without vortex shedding are investigated to find out the self-propelled mechanism of a non-spherical swimmer via the self-controlled rotation coupled with shift of its internal mass.Based on the model,algebraic velocity vector equations for the complex are derived from the Kirchhoff equations.Several simple cases reveal that the single non-spherical body can push itself to move persistently forward to break the kinematic time-reversal symmetry through coupling the specially-appointed rotation with the corresponding cyclic shift of the internal mass,and some typical self-motion patterns such as trochoids in two dimensions and unidirectional spatial helical motions are identified.The study aims to provide a potential swimming manner of underwater vehicles.展开更多
基金supported by the Key R&D Project of Shaanxi Province,China(2020ZDLNY07-06)the Science and Technology Program of Shaanxi Academy of Sciences(2022k-11).
文摘In recent years,Meloidogyne enterolobii has emerged as a major parasitic nematode infesting many plants in tropical or subtropical areas.However,the regions of potential distribution and the main contributing environmental variables for this nematode are unclear.Under the current climate scenario,we predicted the potential geographic distributions of M.enterolobii worldwide and in China using a Maximum Entropy(MaxEnt)model with the occurrence data of this species.Furthermore,the potential distributions of M.enterolobii were projected under three future climate scenarios(BCC-CSM2-MR,CanESM5 and CNRM-CM6-1)for the periods 2050s and 2090s.Changes in the potential distribution were also predicted under different climate conditions.The results showed that highly suitable regions for M.enterolobii were concentrated in Africa,South America,Asia,and North America between latitudes 30°S to 30°N.Bio16(precipitation of the wettest quarter),bio10(mean temperature of the warmest quarter),and bio11(mean temperature of the coldest quarter)were the variables contributing most in predicting potential distributions of M.enterolobii.In addition,the potential suitable areas for M.enterolobii will shift toward higher latitudes under future climate scenarios.This study provides a theoretical basis for controlling and managing this nematode.
基金supported by the National Natural Science Foundation of China(Grant No 11672182).
文摘The moving behaviors of a prolate spheroidal complex with the controllable rotation in an ideal fluid without vortex shedding are investigated to find out the self-propelled mechanism of a non-spherical swimmer via the self-controlled rotation coupled with shift of its internal mass.Based on the model,algebraic velocity vector equations for the complex are derived from the Kirchhoff equations.Several simple cases reveal that the single non-spherical body can push itself to move persistently forward to break the kinematic time-reversal symmetry through coupling the specially-appointed rotation with the corresponding cyclic shift of the internal mass,and some typical self-motion patterns such as trochoids in two dimensions and unidirectional spatial helical motions are identified.The study aims to provide a potential swimming manner of underwater vehicles.
