Table 4.
Multiple regression analysis to estimate the effect of temperature (°C), sponge size (ln-volume, cm3), and the concentrations of pico-and nanoplankton cells (Live C, μg L−1), and detrital particulate organic carbon (Detrital POC, μg L−1) on the volume-specific pumping rate [PRV, ml min−1 (cm sponge)−3] of single-osculated sponge specimens with similar size.
| Variable | A. oroides | C. reniformis | P. ficiformis | D. avara | C. crambe |
|---|---|---|---|---|---|
| Temperature (°C) | 0.19*** | 0.09 | 0.13 | −0.02 | −0.01 |
| ln-volume (cm3) | −0.79*** | −0.66*** | −0.62*** | −0.80*** | −0.59*** |
| Live C (μg L−1) | 0.06 | −0.07 | 0.26* | −0.03 | −0.02 |
| Detrital POC (μg L−1) | −0.26*** | −0.11 | −0.42*** | −0.04 | −0.08 |
| a (ml min−1 cm−3) | 1.69 ± 0.29*** | 2.41 ± 0.26*** | 0.55 ± 0.33 | 2.83 ± 0.32*** | 2.81 ± 0.23*** |
| R2 | 0.70*** | 0.50*** | 0.45*** | 0.63*** | 0.36*** |
Values are the standardized regression coefficients for each variable (rows) and each species (columns). The Intercept (a) and R squared (R2) are also presented below. The first sampling session (July 2012) for C. crambe and D. avara was not included in this analysis because the sponge size range was significantly higher than other sampling periods. Bold values are statistically significant.
p < 0.001;
p < 0.01;
p < 0.05.