Table 1.

Correlations between community similarity with currents and environmental factors

Biological groups	Mantel correlation			Mantel partial correlation	MRM
	N pairs	Ocean transit time	Environmental distance	Ocean transit time partialling out environmental distance	Ocean transit time + environmental distance
Prokaryotes	120	0.28**	0.02	—	0.29**
Small heterotrophic flagellates	112	0.30**	0.04	—	0.31**
Green algae	112	0.27**	0.04	—	0.28**
Fungi	89	0.13**	0.02	—	0.13**
Microbial eukaryotes ALL	112	0.24**	0.005	—	0.24**
Parasites	112	0.23**	0.002	—	0.23**
Cercozoa	107	0.10**	0.06*	0.07**	0.12**
Large flagellates	112	0.19**	0.08	—	0.22**
Coccolithophores 0–160 m	133	0.28**	0.01	—	0.28**
Diatoms 0–160 m	133	0.21**	0.02	—	0.22**
Diatoms surface	93	0.17**	0.04	—	0.18**
Dinoflagellates 0–160 m	133	0.21**	0.004	—	0.21**
Dinoflagellates surface	112	0.11**	0.04	—	0.12*
Mesozooplankton 0–200 m	36	0.40**	Not available	—	Not available
Gelatinous zooplankton	61	0.11**	0.04	—	0.11**
Macrozooplankton	65	0.23**	0.05	—	0.27**
Myctophids	95	0.32**	0.08**	0.20**	0.32**

Mantel correlations and Multiple Regression on distance Matrices (MRM) between β-diversity (i.e., community variation in space), environmental distance, and pair-site ocean transit times; and Mantel partial correlations after controlling for the effects of environmental distance, in statistically significant cases. N pairs: number of pair-sites considered at each group. The statistical significance of comparisons is assessed using Mantel and partial Mantel tests based on Pearson’s product moment correlation using 9999 permutations

*p-value ≤0.05; **p-value ≤0.01