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Ecological Processes

Table 4 Trophic position, δ13C and mixing-model results (numbers in parentheses are SDs)

From: Nile tilapia (Oreochromis niloticus) invasion impacts trophic position and resource use of commercially harvested piscivorous fishes in a large subtropical river

Species

River

Trophic position

(± SD)

Prey fish

trophic position

(± SD)

δ13C (‰)

(± SD)

Prey fish δ13C (‰)

(± SD)

Diet (%) (± SD)

Culter fish

     

Small fish

Crustacean

Aquatic insects

Zooplankton

Phytoplankton

 
 

Beijiang

          
 

Lubao

4.40 (0.43)

4.47 (0.19)

− 26.08(0.63)

− 24.23 (1.83)

      
 

Shijiao

4.35 (0.29)

2.59 (0.71)

− 26.72(0.45)

− 25.96 (0.62)

      
 

Qingyuan

4.62 (0.15)

4.62 (0.38)

− 27.19(2.12)

− 26.72 (0.97)

      
 

Lianjiang

4.89 (0.10)

4.17 (0.40)

− 25.69(0.96)

− 24.86 (0.24)

      
 

Mean

4.57 (0.24)

3.96 (0.42)

− 26.95(1.28)

− 25.16 (1.28)

32.7(0.21)

20.9(0.15)

13.0(0.10)

17(0.13)

16.5(0.13)

 
 

Dongjiang

          
 

Hengli

4.12 (0.17)

4.89 (0.17)

− 28.17(0.52)

− 25.16 (1.49)

      
 

Guzhu

3.94 (0.33)

2.62 (0.85)

− 28.54(0.93)

− 25.51 (3.76)

      
 

Heyuan

3.89 (0.35)

3.67 (0.41)

− 29.72(0.71)

− 28.03 (1.17)

      
 

Huangtian

3.90 (0.17)

3.98 (0.42)

27.88(0.63)

− 23.25 (4.10)

      
 

Mean

3.96 (0.26)

3.79 (0.46)

− 29.01(0.10)

− 25.46 (2.87)

25.5(0.23)

12.7(0.12)

11.9(0.10)

36.3(0.24)

13.6(0.12)

 

Species

River

Trophic position

(± SD)

Prey fish

trophic position

(± SD)

δ13C (‰)

(± SD)

Prey fish δ13C (‰)

(± SD)

Diet (%) (± SD)

Mandarinfish

     

Small fish

Crustacean

Aquatic insects

Zooplankton

Snail

Aquatic plants

 

Beijiang

          
 

Lubao

4.94 (0.06)

3.77 (1.19)

− 24.14(1.09)

− 23.90 (1.07)

      
 

Shijiao

5.22 (0.41)

2.69 (0.42)

− 27.20(0.31)

− 24.62 (0.33)

      
 

Qingyuan

5.13 (0.60)

4.69 (0.30)

− 25.08(1.41)

− 23.78 (0.86)

      
 

Lianjiang

4.72 (0.10)

4.42 (0.55)

− 26.28(3.11)

− 24.18 (0.01)

      
 

Mean

5.00 (0.29)

3.89 (0.62)

− 25.21(2.07)

− 24.03 (0.78)

46.7(0.15)

13.6(0.11)

10.4(0.08)

4.5(0.05)

12.1(0.10)

12.8(0.10)

 

Dongjiang

          
 

Hengli

4.31 (0.26)

3.89 (0.24)

− 26.38(1.72)

− 22.82 (3.67)

      
 

Guzhu

4.09 (0.45)

3.67 (0.50)

− 27.33(3.07)

− 26.11 (3.98)

      
 

Heyuan

3.91 (0.12)

2.79 (1.49)

− 28.35(1.63)

− 26.02 (0.19)

      
 

Huangtian

4.15 (0.11)

3.11 (0.43)

− 29.65(0.71)

− 26.27 (0.53)

      
 

Mean

4.11 (0.24)

3.37 (0.59)

− 28.13(1.84)

− 25.21 (3.29)

29.9(0.22)

8.21(0.07)

20.3(0.17)

17.9(0.18)

8.9(0.08)

14.7(0.13)

Species

River

Trophic position

(± SD)

Prey fish

trophic position

(± SD)

δ13C (‰)

(± SD)

Prey fish δ13C (‰)

(± SD)

Diet (%) (± SD)

Catfish

     

Small fish

Crustacean

Aquatic insects

Fish eggs

Snail

Aquatic plants

 

Beijiang

          
 

Lubao

4.37 (0.13)

3.67 (1.14)

− 25.10(1.08)

− 23.13 (0.58)

      
 

Shijiao

4.76 (0.52)

4.25 (0.26)

− 26.62(1.25)

− 24.96 (0.02)

      
 

Qingyuan

4.28 (1.29)

3.40 (0.57)

− 24.37(0.15)

− 23.34 (0.13)

      
 

Lianjiang

4.22 (1.23)

3.89 (0.12)

− 25.95(1.32)

− 24.62 (0.33)

      
 

Mean

4.41 (0.79)

3.80 (0.52)

− 25.32(0.98)

− 24.95 (1.09)

12.9(0.12)

8.9(0.06)

24.8(0.18)

25.1(0.14)

11.4(0.10)

17.1(0.14)

 

Dongjiang

          
 

Hengli

3.49 (0.10)

3.24 (0.41)

− 27.52(2.00)

− 24.64 (2.79)

      
 

Guzhu

3.55 (0.21)

4.31 (0.29)

− 27.08(0.66)

− 25.68 (1.50)

      
 

Heyuan

3.04 (0.12)

3.52 (0.11)

− 26.98(0.12)

− 24.32 (2.28)

      
 

Huangtian

3.79 (0.09)

3.79 (0.09)

− 27.67(0.18)

− 26.01 (2.01)

      
 

Mean

3.47 (0.13)

3.72 (0.23)

− 27.43(0.99)

− 24.10 (1.83)

9.8(0.07)

12.7(0.11)

43.5(0.17)

4.8(0.03)

13.2(0.11)

15.9(0.14)

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