Interannual fluctuations in copepod abundance and contribution of small forms in the Drake Passage during austral summer

Table 5 Results of stepwise multiple regression analyses for the dependent variables copepod density or biomass considering each copepod size fraction and their sum (log transform data) and the independent environmental variables (AVHRR-SST, AVHRR-SSTa, SeaWIFS Chl a, seawater temperature, salinity) during the three cruises

Dependent variable	Statistically significant independent variable	B	SE B	P-value	R ²
Biomass
<300-μm fraction	SST	0.588	0.081	<0.001	0.72
<300-μm fraction	SSTa	−0.366	0.084
Total	SST	0.634	0.082	<0.001	0.69
Total	SSTa	−0.376	0.084
Oithona similis	SST	0.567	0.085	<0.001	0.68
Oithona similis	SSTa	−0.355	0.089
Nauplii	SST	0.557	0.090	<0.001	0.64
Nauplii	SSTa	−0.379	0.093
>300-μm fraction	SST	0.532	0.115	<0.001	0.40
>300-μm fraction	SSTa	−0.289	0.119
Density
Total	SSTa	−0.387	0.118	<0.001	0.39
Total	SST	0.412	0.111
< 300 μm fraction	SSTa	−0.403	0.121	<0.001	0.36
< 300 μm fraction	SST	0.341	0.113
Nauplii	SST	0.399	0.113	<0.001	0.36
Nauplii	SSTa	−0.329	0.121
Oithona similis	SSTa	−0.363	0.124	0.002	0.22
Oithona similis	SST	0.275	0.124
>300-μm fraction	SST	0.329	0.127	0.011	0.20
>300-μm fraction	SSTa	−0.309	0.135

Only significant relationships are shown
SST AVHRR sea surface temperature, SSTa AVHRR sea surface temperature anomaly, Chl a: SeaWIFS chlorophyll a, B (beta) is the standardized regression coefficient or the slope of the least squares line. SE B is the standard error of beta

ISSN: 1438-3888