Patterns of seasonal plasticity in evaporative water loss and preferred temperature in three geckos of the wet-dry tropics.

IF 2.3 2区 环境科学与生态学 Q2 ECOLOGY
Kimberley Day, Chava L Weitzman, Angga Rachmansah, Kade Skelton, Keith Christian
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Abstract

Seasonal physiological plasticity (acclimatisation) facilitates homeostasis in changing environments and has been studied extensively with respect to thermal biology and metabolism. Less is known about seasonal changes in evaporative water loss (EWL) in response to changing water availability and humidity. The wet-dry tropics of northern Australia experience moderate seasonal temperature changes, but substantial changes in rainfall and humidity. We studied three gecko species (Amalosia rhombifer, Heteronotia binoei and Hemidactylus frenatus) in the wet and dry seasons with respect to their EWL, preferred body temperatures (Tpref), and their choice between a dry and humid refuge at and below Tpref. EWL was significantly lower in the dry season (66% of wet season values). Tpref for two of the species did not change seasonally, but A. rhombifer selected lower Tpref during the warmer wet season. Given a choice of refugia, the humid refuge at low temperatures was never preferred over the warm microhabitat. When both refugia were at the preferred temperature, only A. rhombifer showed a preference for the humid microhabitat. These results demonstrate that although thermoregulation is prioritised in the short term, hydroregulation (physiological plasticity in EWL) is adjusted in the longer term, with shifts occurring on a seasonal scale. However, it is possible that shifts in EWL may occur in response to prevailing weather conditions on a shorter timescale. Before broad generalisations can be drawn about the phenomenon of EWL plasticity, measurements need to be taken from more species in different climatic regions at ecologically relevant timescales.

干湿热带地区三种壁虎蒸发失水和偏好温度的季节可塑性模式。
季节性生理可塑性(适应性)有助于在变化的环境中保持体内平衡,并在热生物学和代谢方面得到了广泛的研究。蒸发水损失(EWL)随水分有效性和湿度变化的季节性变化所知甚少。澳大利亚北部的干湿热带地区经历了温和的季节性温度变化,但降雨量和湿度却发生了重大变化。本文研究了三种壁虎(Amalosia rhombifer, Heteronotia binoei和Hemidactylus frenatus)在湿季和旱季的EWL、偏好体温(Tpref)以及在Tpref以下的干燥和潮湿避难所的选择。EWL在旱季显著降低(占雨季值的66%)。两种昆虫的温度偏好不随季节变化,但扁蝽在温暖的雨季选择较低的温度偏好。如果要选择避难所,潮湿的低温避难所永远不会比温暖的微栖息地更受欢迎。当两种生境均处于偏好温度时,只有菱形蚁对潮湿微生境表现出偏好。这些结果表明,尽管短期内体温调节是优先考虑的,但长期内水分调节(EWL的生理可塑性)是调整的,并且在季节尺度上发生变化。然而,EWL的变化可能会在较短的时间尺度上响应当时的天气条件而发生。在对EWL可塑性现象进行广泛的概括之前,需要在生态相关的时间尺度上对不同气候区域的更多物种进行测量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Oecologia
Oecologia 环境科学-生态学
CiteScore
5.10
自引率
0.00%
发文量
192
审稿时长
5.3 months
期刊介绍: Oecologia publishes innovative ecological research of international interest. We seek reviews, advances in methodology, and original contributions, emphasizing the following areas: Population ecology, Plant-microbe-animal interactions, Ecosystem ecology, Community ecology, Global change ecology, Conservation ecology, Behavioral ecology and Physiological Ecology. In general, studies that are purely descriptive, mathematical, documentary, and/or natural history will not be considered.
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