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Latitudinal pattern of the thermal sensitivity of running speed in the endemic lizard Liolaemus multimaculatus

Integrative Zoology 2022年第4期17卷 619-637页

作者： Oscar Aníbal STELLATELLI Laura EVEGA Carolina BLOCK Camila ROCCA Patricio BELLAGAMBA Juan Esteban DAJIL Félix Benjamín CRUZ Instituto de Investigaciones Marinas y Costeras(IIMyC) Universidad Nacional de Mar del Plata-CONICETFacultad de Ciencias Exactas y NaturalesMar del PlataArgentina Municipalidad de General Pueyrredón Mar del PlataArgentina Instituto de Investigaciones en Biodiversidad y Medioambiente(INIBIOMA) Universidad Nacional del Comahue-CONICETSan Carlos de BarilocheArgentina

Physiological performance in lizards may be affected by climate across latitudinal or altitudinal gradients.In the coastal dune barriers in central-eastern Argentina,the annual maximum environmental temperature decreases up to 2℃ from low to high latitudes,while the mean relative humidity of the air decreases from 50%to 25%.Liolaemus multimaculatus,a lizard in the family Liolaemidae,is restricted to these coastal dunes.We investigated the locomotor performance of the species at 6 different sites distributed throughout its range in these dune barriers.We inquired whether locomotor performance metrics were sensitive to the thermal regime attributable to latitude.The thermal performance breadth increased from 7%to 82%with latitude,due to a decrease in its critical thermal minimum of up to 5℃ at higher latitudes.Lizards from high latitude sites showed a thermal optimum,that is,the body temperature at which maximum speed is achieved,up to 4℃lower than that of lizards from the low latitude.At relatively low temperatures,the maximum running speed of high-latitude individuals was faster than that of low-latitude ones.Thermal parameters of locomotor performance were labile,decreasing as a function of latitude.These results show populations of L.multimaculatus adjust thermal physiology to cope with local climatic variations.This suggests that thermal sensitivity responds to the magnitude of latitudinal fluctuations in environmental temperature.

关键词： latitude Liolaemus reptile running speed temperature thermal sensitivity

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The Effect of Body Pitching on Leg-Spring Behavior in Quadruped running

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Journal of Bionic Engineering 2010年第3期7卷 219-227页

作者： Qi Deng, Shigang Wang, Qinghua Liang, Jinqiu Mo School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240 P. R. China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai P. R. China

In this paper we investigated how the running speed would affect the dynamics of body pitching, and whether body inertiais important for animals. Passive trotting of spring-mass model and passive bounding of spring-beam model were studied atdifferent speeds for different sets of body parameters respectively. Furthermore, different body inertias were used in bounding.We found that running speed exerts effect on leg performance by means of centrifugal force. The centrifugal force can be understoodas an enhancement to the natural frequency of the spring-mass system. The disadvantage of body pitching may beoffset by the great increase in centrifugal force at high speed. The results also reveal that body mass distribution might not be themain reason for the difference in maximal running speeds of different animals.

关键词： body pitching leg performance running speed centrifugal force body inertia

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跳远运动中助跑速度的研究

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体育 1999年第10期 62-64页

作者：李宏印樊西宁

根据对国内外优秀跳远运动员的助跑速度，跳远成绩等相关因素的系统分析，提出了助跑速度是决定跳远成绩的主要因素。论述了跳远运动中助跑速度和绝对速度以及助跑速度利用率与跳运成绩的关系，并为提高我国跳远运动提出相应对策。

关键词：跳远运动助跑速度绝对速度助跑利用率运动成绩 long jump running speed absolute veloeity the use of therunning speed results

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