Temperature reaction norms of Daphnia magna:: the effect of food concentration
Temperature reaction norms of Daphnia magna:: the effect of food concentration
复制标题
DOI：
10.1046/j.1365-2427.2001.00630.x
复制
发表时间：
2001-03-01
影响因子：
2.7
通讯作者：
Lampert, W
中科院分区：
文献类型：
--
作者：
Giebelhausen, B;Lampert, W
1.采用4 × 4析因流通设计，研究了温度和食物浓度对大型蚤适合度的影响。食物范围为0.1至1.0毫克C L（-1）和温度范围为15至30摄氏度。青少年生长率（g（j））被用来构建反应规范的温度在不同的食物浓度。两个克隆分离自同一池塘在不同的季节没有不同的温度反应。反应标准具有最佳曲线的形状，在20 ℃左右具有最高值。温度与食物存在显着的相互作用，当食物不受限制时，温度反应最为明显。3.适应性的差异是生理参数对食物和温度的不同反应的结果。随着温度的升高和食物浓度的降低，首次繁殖时的年龄和大小以及产卵量均呈下降趋势.由于温度效应在食物浓度最高时最强，因此可以认为环境变暖可能会影响D。麦格纳更多地通过春季而不是夏季的气温上升。
1. The effects of temperature and food concentration on the fitness of Daphnia magna were tested in a 4 x 4 factorial flow-through design. Food ranged from 0.1 to 1.0 mg C L (-1) and temperature ranged from 15 to 30 degreesC.2. The juvenile growth rate (g(j)) was used to construct reaction norms for temperature at varying food concentrations. Two clones isolated from the same pond at different seasons did not differ with respect to their temperature responses. Reaction norms had the shape of an optimum curve with highest values around 20 degreesC. There was a significant temperature-food interaction as the temperature response was most pronounced when the food was not limiting.3. Differences in fitness were a consequence of different responses of physiological parameters to food and temperature. Age and size at first reproduction, as well as egg numbers, decreased with increasing temperature and decreasing food concentration.4. As the temperature effect was strongest at the highest food concentrations, it can be concluded that environmental warming may affect D. magna more through a temperature rise earlier in spring rather than in summer.