marginally significantP < 0.05
The Shannon diversity model accounts for 54.4% of the variation, with significant contributions from salinity ( edf = 1.3, F = 12.9, P < 0.001), C/N ratio ( edf = 1, F = 21.5, P < 0.001), and δ 13 C ( edf = 2, F = 6.9, P < 0.01) and a marginally significant effect from temperature ( edf = 2.1, F = 3.2, P < 0.05).