COVER PHOTO: Using a meta-analysis, Stephens et al. (this issue, Article e01525; doi:10.1002/ecm.1525) demonstrate that trophic discrimination factors (TDFs) – offsets between the isotopic composition of diet and animal tissues – are strongly influenced by consumer type and diet source, particularly for carbon (TDF-δ¹³C). Using field-collected data from a variety of small mammal species (including the pictured deer mouse Peromyscus maniculatus) the authors also show that using incorrect TDFs result in inaccurate estimates of diet. Photo credit: Ryan B. Stephens.

中文翻译：

---

封面图片

封面照片： Stephens 等人使用荟萃分析。（本期，文章 e01525；doi:10.1002/ecm.1525）表明，营养辨别因子（TDF）——饮食和动物组织的同位素组成之间的抵消——受到消费者类型和饮食来源的强烈影响，尤其是碳（TDF -δ ¹³ C)。使用从各种小型哺乳动物物种（包括图中所示的鹿鼠Peromyscus maniculatus）现场收集的数据，作者还表明，使用不正确的 TDF 会导致对饮食的估计不准确。图片来源：瑞安·B·斯蒂芬斯。