Table 2.
Comparison of specific growth response of Ulva spp. as % growth day−1 (mean ± SE) for control, nitrate, and phosphate nutrient treatments during the peak growing season within each site
| % growth day−1 | |||||
|---|---|---|---|---|---|
| Site | Control | NO3− added | PO43− added | F | P |
| Waquoit Bay | |||||
| Childs River (C) | |||||
| Jun-04 | 12.6 ± 0.9 | – | – | ||
| Sep-04 | 3.4 ± 0.5 | – | – | ||
| Jul-05 | 25.7 ± 3.1 | 34.2 ± 9.9 | 18.8 ± 1.4 | 1.7 | 0.25 |
| Quashnet River (Q) | |||||
| Jun-04 | 10.2 ± 0.7 | 15.9 ± 2.8 | 12.2 ± 1.3 | 3.3 | 0.09 |
| Sep-04 | 6.3 ± 1.0 | – | – | ||
| Sage Lot Pond (S) | |||||
| Jun-04 | 3.8 ± 1.0 | – | – | ||
| Sep-04 | 2.9 ± 0.9 | – | – | ||
| Jul-05 | 8.9 ± 0.2 | 42.6 ± 7.8 | 8.0 ± 2.4 | 20.9 | 0.001 |
| Jobos Bay (J) | 9.9 ± 1.6 | 23.5 ± 4.4 | 8.5 ± 1.3 | 11.8 | 0.003 |
| Urias Estuary (U) | 8.8 ± 1.3 | 10.8 ± 1.5 | 9.6 ± 1.8 | 0.6 | 0.59 |
| Flamengo Sound (F) | 4.9 ± 4.5 | 4.1 ± 3.8 | 6.1 ± 1.7 | 0.1 | 0.90 |
| San Antonio Bay (SA) | 22.6 ± 3.7 | 19.6 ± 1.3 | 24.7 ± 2.2 | 0.4 | 0.66 |
| Mondego Estuary (M) | 6.4 ± 3.6 | 7.2 ± 5.9 | 14.0. ± 1.4 | 1.5 | 0.29 |
| Venice Lagoon (V) | 12.0 ± 1.2 | 11.2 ± 3.2 | 42.7 ± 8.4 | 15.7 | 0.001 |
For all treatments, n=4 in each site, with the exception of Urias and Mondego estuaries where n=3. Significant differences within a site across nutrient treatments are indicated by F and P values from the results of one-way anova.