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1

Relation between body-size and thermoregulation behavior: postprandial thermophily in spiny-tailed agama Uromastyx acanthinura Bell

100%
Berec M., Stara Z., Polakova S.
Polish Journal of Ecology
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2014
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tom 62
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nr 1
Ectothermal vertebrates regulate their body temperature within definite limits to maintain physiological processes at their optimal levels. Among others, food processing and absorption are strongly temperature-dependent. Deficiency of adequate temperatures limits ectotherms in growth and maintenance. On the other hand, thermoregulatory behavior is costly and should be constrained by many factors. Using artificial thermal gradients (26–44℃ ), we measured temperature preferences of 10 spiny-tailed agamas (Uromastyx acanthinura) in controlled indoor experiment. Each lizard could choose place in the terrarium before and after feeding. Then, temperature preferences during pre-feeding and post-feeding periods were compared. We found significant increase of preferred temperature after feeding. Detailed view revealed that there is consistent influence of body size: bigger lizards maintained higher temperature during the whole experiment. We hypothesize that bigger potential predation risk on smaller lizards due to their size would force them to choose less optimal conditions.
2

Geometrical aspects of the energetic effectiveness of huddling in small mammals

100%
Canals M., Rosenmann M., Bozinovic F.
Acta Theriologica
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1997
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tom 42
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nr 3
Reduced energy expenditure resulting from huddling in small mammals is mainly attributed to the reduced surface area/volume ratio of the huddling group. Here we propose a model to account for the reduction of the relative exposed area of grouped animals and for the diminution of metabolic rate during huddling. We attempt to explain mechanistically how changes in energy savings may operate. We applied our model to results obtained by grouping deformable bodies, and also laboratory meas­urements of oxygen consumption on huddling small mammals of four species. We found a small amount of diversity in the energetic efficiency of huddling. We estimate that the average relative area lost during huddling ranged between 28.7 and 39.1%. The average huddling effectiveness in the studied species was 42%, which is a significant fraction of the energy/matter budget of a small mammal, especially under winter conditions.
3
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A comparison of febrile responses induced by LPS from E.coli and S.abortus in unrestrained rats placed in a thermal gradient

67%
Bodurka M., Caputa M., Bodurka J.
Journal of Physiology and Pharmacology
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1997
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tom 48
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nr 1
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