Table 5 List of various fatty acid-based trophic marker indices

Carnivory Index

\( {I}_{Ca}=\frac{18:1\left(n-9\right)}{\left[16:1\left(n-7\right)+16:4\left(n-1\right)+18:1\left(n-7\right)+18:2\left(n-6\right)+18:3\left(n-3\right)+18:4\left(n-3\right)+20:4\left(n-6\right)+20:5\left(n-3\right)\right]} \)

Chlorophyta Index

I_Ch = 18:1(n − 7) + 18:3(n − 3)

Phaeophyceae Index

I_P = 18:4(n − 3)

Rhodophyta Index

\( {I}_R=\frac{20:5\left(n-3\right)}{\left[16:0+18:0+22:6\left(n-3\right)\right]} \)

Bacillariophyceae Index

I_B = 16:1(n − 7) + 16:4(n − 1)

Vascular Plant Index

I_V = 18:2(n − 6)

16:0/I_V

\( 16:0/{I}_V=\frac{16:0}{18:2\left(n-6\right)} \)

Σ_{algae FA}/I_V

\( {I}_T=\frac{\left[16:1\left(n-7\right)+16:4\left(n-1\right)+18:1\left(n-7\right)+18:3\left(n-3\right)+18:4\left(n-3\right)+20:4\left(n-6\right)\right]}{\ 18:2\left(n-6\right)} \)