Dietary lipid quality affects temperature-mediated reaction norms of a freshwater key herbivore
Dietary lipid quality affects temperature-mediated reaction norms of a freshwater key herbivore
复制标题
膳食脂质质量影响淡水主要食草动物的温度介导的反应规范
作者：
D. Martin‐Creuzburg;A. Wacker;Christine Ziese;M. Kainz
生活史特征中温度介导的可塑性强烈影响变温动物应对不断变化的环境温度的能力。我们假设变温动物的温度介导的反应规范受到必需膳食脂质（即多不饱和脂肪酸（PUFA）和甾醇）的可用性的限制，因为这些脂质参与生物膜对温度变化的顺粘性适应。进行了一项生活史实验，其中淡水食草动物大型水蚤在四种不同的温度（10、15、20、25°C）下饲养，食物来源的多不饱和脂肪酸和甾醇成分不同。体细胞生长率随着温度的升高而显着增加，但仅在 10°C 时才获得食物来源之间的差异，此时富含 PUFA 饮食的动物比缺乏 PUFA 饮食的动物生长得更好。富含 PUFA 的食物来源导致 10°C 时的种群增长率显着高于缺乏 PUFA 的食物，并且随着膳食 PUFA 可用性的增加，后代生产的最适温度明显转向更冷的温度。在缺乏 PUFA 的食物中补充单一 PUFA 能够产生可存活的后代，并显着提高 10°C 下的种群增长率，表明膳食 PUFA 对于适应寒冷温度至关重要。相比之下，在 25°C 补充胆固醇后，可存活后代的累积数量显着增加，并且后代生产的最佳温度向更温暖的温度转移，这意味着甾醇需求随着温度的增加而增加。总之，必需的膳食脂质显着影响变温动物的温度介导的反应规范，因此生活史特征中温度介导的可塑性受到强烈的食品质量限制。
Temperature-mediated plasticity in life history traits strongly affects the capability of ectotherms to cope with changing environmental temperatures. We hypothesised that temperature-mediated reaction norms of ectotherms are constrained by the availability of essential dietary lipids, i.e. polyunsaturated fatty acids (PUFA) and sterols, as these lipids are involved in the homeoviscous adaptation of biological membranes to changing temperatures. A life history experiment was conducted in which the freshwater herbivore Daphnia magna was raised at four different temperatures (10, 15, 20, 25°C) with food sources differing in their PUFA and sterol composition. Somatic growth rates increased significantly with increasing temperature, but differences among food sources were obtained only at 10°C at which animals grew better on PUFA-rich diets than on PUFA-deficient diets. PUFA-rich food sources resulted in significantly higher population growth rates at 10°C than PUFA-deficient food, and the optimum temperature for offspring production was clearly shifted towards colder temperatures with an increased availability of dietary PUFA. Supplementation of PUFA-deficient food with single PUFA enabled the production of viable offspring and significantly increased population growth rates at 10°C, indicating that dietary PUFA are crucial for the acclimation to cold temperatures. In contrast, cumulative numbers of viable offspring increased significantly upon cholesterol supplementation at 25°C and the optimum temperature for offspring production was shifted towards warmer temperatures, implying that sterol requirements increase with temperature. In conclusion, essential dietary lipids significantly affect temperature-mediated reaction norms of ectotherms and thus temperature-mediated plasticity in life history traits is subject to strong food quality constraints.
DOI：
10.1098/rspb.2008.1540
发表时间：
2009-05-22
影响因子：
4.7
作者：
Martin-Creuzburg, Dominik;Sperfeld, Erik;Wacker, Alexander
通讯作者：
Wacker, Alexander
影响因子：
2.8
作者：
Sperfeld, Erik;Wacker, Alexander
通讯作者：
Wacker, Alexander