Movement patterns of lacertid lizards: effects of temperature on speed, pauses and gait in Lacerta vivipara R.A. Avery, D.J. Bond Department of Zoology, The University, Bristol BS8 1 UG, UK. Abstract. Lacerta vivipara emerging from their overnight retreat before they had the opportunity to thermo- rcgulate moved with an alternation of locomotor bursts and pauses. Mean speed during bursts of locomo- tion fell with decreasing temperature from 3.21 snout-vent lengths (SVL) s-1 at the activity temperature (Tact ∼ 33°C) to 0.15 SVL s-1 at 5°C. Between Tact and 19°C the reduction was small (Q10 = 1.12) and statistically not significant; between 19°C and 5°C the change was very much greater (Q10 = 7.7). The pauses between locomotor bursts increased progressively in duration over the whole range of decreasing temperatures from Tact to 5°C, although the change from Tact to 23°C was not significant. Gait changed progressively from almost simultaneous movement of contralateral diagonal limbs at Tact to independent movement of limbs in the sequence LF, RH, RF, LH at 7°C, with increases in the mean duty factor of individual feet from 0.50 to 0.76 and in the proportion of time for which 3 or 4 feet were in
Amphibia-Reptilia – Brill
Published: Jan 1, 1989
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