Figure 4.

Boxplot of δ¹³C and δ¹⁵N values for Carassius auratus, Parabramis pekinensis, and Toxabramis swinhonis in Hongze lake. Box-plot representation: the horizontal line inside the box represents the median, and the lower and upper borders of the box represent the 25th and 75th percentiles, respectively. The upper and lower whiskers indicate the maximum and minimum range of the data excluding outliers (black dots). ns: no significant differences in the δ¹³C or δ¹⁵N values among water periods; *: p < 0.05; ****: p < 0.001.