Table 2 The dietary compositions of P. fulvldraco and C. heterodon revealed by gut content analysis and the stable isotope signatures

Terrestrial plants

-

-

-

-

-

-

Plant debris

-

-

-

14.5

−25.1

1.7

Phytoplankton

8.5

−23.8

5.3

23.0

−23.2

4.2

Beneath algae

-

-

-

8.5

−22.9

10.3

Zooplankton

27.0

−22.9

6.7

21.5

−23.7

6.2

Shrimp

12.5

−21.5

8.7

-

-

-

Mollusk

32.5

−22.1

7.4

27.5

−22.6

6.9

Fish

19.5

−20.7

11.4

5.0

−21.5

9.2

Bulk diet

−22.1

8.2

−22.5

6.6

Discrimination (Δ)

+0.47

3.3

−0.51

2.9