Table 1.

Correlations between environmental variables and bacterial diversity as measured by four diversity indices.

	Spearman rho	p-level
Phyto biomass (chl a) vs. bacterial diversity
No. of OTUs	0.40	0.223
Shannon index	0.08	0.811
Phylo. diversity index	0.40	0.223
Chao index	0.40	0.223
Total no. of Pn cells vs. bacterial diversity
No. of OTUs	0.14	0.689
Shannon index	-0.13	0.709
Phylo. diversity index	0.15	0.670
Chao index	0.14	0.689
P. australis no. vs. bacterial diversity
No. of OTUs	-0.85	0.001
Shannon index	-0.62	0.043
Phylo. diversity index	-0.85	0.001
Chao index	-0.85	0.001
P. fraudulenta no. vs. bacterial diversity
No. of OTUs	-0.90	0.037
Shannon Index	-0.70	0.1881
Phylo. diversity index	-1.0	<0.0001
Chao index	-0.90	0.037
Temperature vs. bacterial diversity
No. of OTUs	-0.65	0.032
Shannon index	-0.78	0.005
Phylo. diversity index	-0.55	0.077
Chao index	-0.65	0.032
Nitrate vs. bacterial diversity
No. of OTUs	0.70	0.017
Shannon index	0.72	0.013
Phylo. diversity index	0.64	0.035
Chao index	0.70	0.017
Phosphate vs. bacterial diversity
No. of OTUs	0.65	0.032
Shannon index	0.60	0.052
Phylo. diversity index	0.55	0.082
Chao index	0.65	0.032