Table 2.
Isotopic niche overlap among three fishes in Hongze Lake and across different water periods, based on the maximum likelihood fitted ellipses with 95% credibility intervals derived from Bayesian posterior distributions.
| Predator 1—Predator 2 | Pred. 1 (%) | 95% CI | Pred. 2 (%) | 95% CI | Overlap Between Pred. 1 and Pred. 2 (%) |
|---|---|---|---|---|---|
| In the whole lake | |||||
| P. pekinensis—C. auratus | 23.3057 | 19.8693–25.6070 | 9.7826 | 7.4732–11.6734 | 28.79 |
| P. pekinensis—T. swinhonis | 23.3057 | 19.8693–25.6070 | 14.8831 | 11.7498–15.9053 | 33.79 |
| C. auratus—T. swinhonis | 9.7826 | 7.4732–11.6734 | 14.8831 | 11.7498–15.9053 | 39.52 |
| Across different water periods | |||||
|
P. pekinensis—C. auratus (mid-water periods) |
20.4791 | 12.0613–24.6589 | 7.8633 | 16.3888–23.8486 | 23.63 |
|
P. pekinensis—T. swinhonis (mid-water periods) |
20.4791 | 12.0613–24.6589 | 10.5111 | 21.8892–46.3491 | 26.28 |
|
C. auratus—T. swinhonis (mid-water periods) |
7.8633 | 16.3888–23.8486 | 10.5111 | 21.8892–46.3491 | 34.75 |
|
P. pekinensis—C. auratus (low-water periods) |
18.8702 | 6.2007–23.7846 | 14.3762 | 4.7764–10.2699 | 31.48 |
|
P. pekinensis—T. swinhonis (low-water periods) |
18.8702 | 6.2007–23.7846 | 6.9476 | 6.2286–11.0645 | 26.91 |
|
C. auratus—T. swinhonis (low-water periods) |
14.3762 | 4.7764–10.2699 | 6.9476 | 6.2286–11.0645 | 29.23 |
|
P. pekinensis—C. auratus (high-water periods) |
31.1993 | 4.1066–8.3071 | 7.7581 | 5.8393–15.1646 | 19.91 |
|
P. pekinensis—T. swinhonis (high-water periods) |
31.1993 | 4.1066–8.3071 | 11.9764 | 7.5546–17.3958 | 22.85 |
|
C. auratus—T. swinhonis (high-water periods) |
7.7581 | 5.8393–15.1646 | 11.9764 | 7.5546–17.3958 | 27.23 |
Note: Pred. 1 indicates the percentage of the isotopic niche of “predator 1” that is overlapped by “predator 2”. Pred. 2 indicates the percentage of the isotopic niche of “predator 2” that is overlapped by the “predator 1”.