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Combined effects of temperature and macronutrient balance on life-history traits in Drosophila melanogaster: implications for life-history trade-offs and fundamental niche.
Oecologia ( IF 2.7 ) Pub Date : 2020-05-16 , DOI: 10.1007/s00442-020-04666-0
Keonhee E Kim 1 , Taehwan Jang 1 , Kwang Pum Lee 1
Affiliation  

Temperature and nutrition are amongst the most influential environmental determinants of Darwinian fitness in ectotherms. Since the ongoing climate warming is known to alter nutritional environments encountered by ectotherms, a precise understanding of the integrated effects of these two factors on ectotherm performance is essential for improving the accuracy of predictions regarding how ectotherms will respond to climate warming. Here we employed response surface methodology to examine how multiple life-history traits were expressed across a grid of environmental conditions representing full combinations of six ambient temperatures (13, 18, 23, 28, 31, 33 °C) and eight dietary protein:carbohydrate ratios (P:C = 1:16, 1:8, 1:4, 1:2, 1:1, 2:1, 4:1, 8:1) in Drosophila melanogaster. Different life-history traits were maximized in different regions in the two-dimensional temperature-nutrient space. The optimal temperature and P:C ratio identified for adult lifespan (13 °C and 1:16) were lower than those for early-life female fecundity (28 °C and 4:1). Similar divergence in thermal and nutritional optima was found between body mass at adult emergence (18 °C and P:C 1:1) and the rate of pre-adult development (28 °C and P:C 4:1). Pre-adult survival was maximized over a broad range of temperature (18-28 °C) and P:C ratio (1:8-8:1). These results indicate that the occurrence of life-history trade-offs is regulated by both temperature and dietary P:C ratio. The estimated measure of fitness was maximized at 23 °C and P:C 2:1. Based on the shape of the response surface constructed for this estimated fitness, we characterized the fundamental thermal and nutritional niche for D. melanogaster with unprecedented detail.

中文翻译:

温度和大量营养素平衡对果蝇生活史特征的综合影响:对生活史取舍和基本生态位的影响。

温度和营养是外温中达尔文适应性最有影响力的环境决定因素之一。由于已知持续进行的气候变暖会改变等温线遇到的营养环境,因此准确了解这两个因素对等温线性能的综合影响对于提高有关等温线将如何响应气候变暖的预测的准确性至关重要。在这里,我们采用响应面方法研究了如何在代表六种环境温度(13、18、23、28、28、31、33°C)和八种饮食蛋白:碳水化合物的完全组合的环境条件下如何表达多种生活史特征果蝇中的比率(P:C = 1:16、1:8、1:4、1:2、1:1、2:1、4:1、8:1)。在二维温度-营养空间中,不同区域的不同生活史特征得到了最大化。对于成年寿命(13°C和1:16)确定的最佳温度和P:C比要低于早年雌性生殖力(28°C和4:1)。在成年后的体重(18°C和P:C 1:1)与成年前的发育速度(28°C和P:C 4:1)之间,在热量和营养方面的最佳差异相似。在较宽的温度范围(18-28°C)和P:C比(1:8-8:1)范围内,成年前的生存率达到了最大值。这些结果表明,生活史权衡的发生受温度和饮食中P:C比例的调节。在23°C和P:C 2:1的情况下,估计的适应性指标达到最大。根据为此估算的适应度构造的响应面的形状,
更新日期:2020-05-16
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