کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8649915 1571070 2018 32 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Variation of preferred body temperatures along an altitudinal gradient: A multi-species study
ترجمه فارسی عنوان
تغییر درجه حرارت منتخب بدن در طول گرادیان ارتفاع: مطالعه چند گونه
کلمات کلیدی
دمای مورد نظر بدن، مارمولک ها، دوزیستان، ارتفاع فرضیه ضد گرید، استراتژی های حرارتی،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم کشاورزی و بیولوژیک (عمومی)
چکیده انگلیسی
Temperature affects the physiological functions of ectotherms. To maintain optimal body temperature and ensure physiological performance, these organisms can use behavioral adjustments to keep the body temperature in their specific temperature range, so-called preferred temperature (Tpref). It is therefore crucial to describe and understand how Tpref vary within and amongst populations to predict the effects of climate change of altitudinal range shifts in organisms. We aimed at determining the altitudinal variations in Tpref in three ectothermic species (the Pyrenean brook salamander - a semi-aquatic and thigmothermic amphibian - the European common lizard and the wall lizard - both heliothermic species). Using an experimental approach where Tpref were measured along a temperature gradient in laboratory conditions, we used a cross-sectional approach to compare the variation of Tpref measured in populations sampled along the altitudinal gradient in the Pyrenees. We hypothesized a complex and highly variable intra-specific response of Tpref along geographical clines, with a positive relationship between Tpref and altitude (as predicted by the countergradient variation), the reverse pattern (referring to the adaptation of local optima hypothesis), or no relationship at all. Our results corroborated partially the countergradient hypothesis in the salamander (middle to high elevation part). At high altitude level, individuals may compensate for lower opportunities of favorable conditions by choosing a high temperature which maximizes their activities. However, populations from low elevation level hence better supported the adaptation of local optima hypothesis, such as both lizard species, for which Tpref tended instead to decrease with altitude. Lizards from cold climates may be physiologically adapted to low temperature, with the ability to reach optimal functioning at lower temperature than individuals from low altitude. Our findings suggest that predicting future niche models should therefore take into account the variability of Tpref, where species might be differently affected by global warming.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Thermal Biology - Volume 77, October 2018, Pages 38-44
نویسندگان
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