Figure 4
From: Low diversity of planktonic bacteria in the tropical ocean
Relationship between OTU richness and temperature.
Bacterial diversity expressed as the ln of OTU richness (S), was plotted against the water temperature. A second order polynomial model was fitted to the data and significance was calculated for permutations (999). A separate model was constructed for each of the size fractions of the marine plankton: FL (a), SPA (b) and LPA (c). All three models were highly statistically significant (** p < 0.01).The color key shows Pielou’s index of evenness (J‘). The coefficient of determination (adjusted R2) is reported for each of the models in the upper right part of the graphs. Triangles represent samples from depths above 100 m, while circles represent samples from depths >100 m.
