. 2012 Oct 23;3:379. doi: 10.3389/fmicb.2012.00379

Table 3.

Pearson product-moment correlation matrix comparing variables measured in SPM (HBP_SPM, EEA, POC and PON fluxes, and C:N ratio) and in seawater (water temperature and HBP_SW).

	LAPase	BGase	Lipase	APase	POC flux	PON flux	C:N ratio	Water temp.	HBP_SW
HBPSPM	–0.032	0.040	0.201	0.113	–0.415	–0.397	–0.399	0.931	0.764
	0.935	0.919	0.603	0.773	0.266	0.290	0.372	<0.001	0.017*
LAPase		0.926	–0.190	–0.089	0.726	0.736	–0.200	–0.171	0.052
		<0.001	0.624	0.820	0.027	0.024	0.605	0.659	0.895
BGase			–0.280	–0.044	0.687	0.695	–0.318	–0.085	0.069
			0.466	0.910	0.041	0.038	0.404	0.829	0.861
Lipase				0.623	–0.401	–0.416	0.394	0.211	0.097
				0.073	0.285	0.265	0.294	0.586	0.861
APase					–0.513	–0.540	0.336	0.236	–0.407
					0.158	0.133	0.376	0.540	0.277
POC flux						0.998	–0.087	–0.626	–0.028
						<0.001	0.825	0.071	0.944
PON flux							–0.147	–0.600	0.010
							0.706	0.088	0.980
C:N ratio								–0.419	–0.501
								0.262	0.170
Water temp.									0.651
									0.058

HBP_SPM and EEAs in SPM were normalized to POC. Upper and lower numbers indicate the correlation coefficient (r) and the P value, respectively (n = 9). Significant correlations (P < 0.05) are underlined.

Failed constant variance (homoscedasticity) test. SPM, sinking particulate matter; HBP_SPM, heterotrophic bacterial production on SPM; EEA, extracellular enzyme activity; POC, particulate organic carbon; PON, particulate organic nitrogen; HBP_SW, heterotrophic bacterial production in seawater.