Table 2. BV-STEP and BIO-ENV Spearman rank coefficients (ρ) showing correlation between abundant taxonomic groups within each environment and environmental variables.
| BV-STEP factors | ρ | BIO-ENV factors | ρ | Variability explained | |
|---|---|---|---|---|---|
| Slope bottom | |||||
| SAR406 | DO, BP | 0.641 | DO | 0.472 | 18.4% |
| Temperature | 0.371 | ||||
| Deltaproteobacteria | DO, BP | 0.466 | BP | 0.356 | 23.9% |
| Temperature | 0.333 | ||||
| SAR11 | Temperature, DO, Chl a, Nitrite, BP, Upwelling | 0.366 | DO | 0.189 | 41.7% |
| Upwelling | 0.183 | ||||
| Shelf Bottom | |||||
| Gammaproteobacteria | Temperature, DO, BP | 0.533 | DO | 0.440 | 44.6% |
| Temperature | 0.413 | ||||
| SUP05 | Temperature, DO | 0.432 | Temperature | 0.392 | 40.1% |
| DO | 0.376 | ||||
| Mesopelagic | |||||
| SAR11 | Depth, Salinity, Chl a, DSi, River flow, Residence time | 0.441 | Depth | 0.287 | 52.4% |
| Salinity | 0.259 | ||||
| Epipelagic | |||||
| Prochlorococcus | Salinity, DO | 0.324 | Salinity | 0.289 | 2.5% |
| DO | 0.239 | ||||
| SAR11 | Salinity, DO | 0.397 | Salinity | 0.334 | 3.6% |
| DO | 0.313 | ||||
| Plume | |||||
| Rhodobacteraceae | Depth, Temperature, DO, Nitrite, Org P, BP, River flow, Residence Time | 0.318 | BPTemperature | 0.2420.215 | 49.4% |
| Polaribacter | Temperature, DO, DOC, BP, Upwelling | 0.505 | BP | 0.457 | 24.0% |
| Temperature | 0.368 | ||||
| Estuary | |||||
| Rhodobacteraceae | Ammonium, River flow, Residence time | 0.610 | River flow | 0.550 | 15.2% |
| Residence time | 0.550 | ||||
| Flavobacteria | Salinity, Nitrate3, BP, River flow, Residence time | 0.684 | River flow | 0.660 | 18.2% |
| Residence time | 0.660 | ||||
| River | |||||
| Actinobacteria | DO, Chl a, Ammonium, DOC, POC, PN | 0.811 | POC | 0.698 | 84.8% |
| PN | 0.698 | ||||
| Betaproteobacteria | Depth, DO, POC, PN, BP | 0.580 | POC | 0.571 | 81.4% |
| PN | 0.571 | ||||
| SAR11 | Nitrate, Org N, POC, PN, River flow, Residence time | 0.802 | POC | 0.760 | 96.8% |
| PN | 0.760 | ||||
Abbreviations: BP, bacterial production rate; Chl a, chlorophyll a; DO, dissolved oxygen; DOC, dissolved organic carbon; DSi, silicic acid; PN, particulate nitrogen; POC, particulate organic carbon. Variables from BV-STEP results were used in CCA/RDA analysis to determine the percent of community variability explained.