Fremantle Port Inner Harbour and Channel ... - Fremantle Ports

Table 3.2PERMANOVA table of results for P.angustifolia shoot countsSource df SS MS Pseudo-F P valueZone 2 3441.1 1720.6 51.487 0.001Site(Zone) 12 1627.2 135.6 4.0577 0.001Transect(Site(Zone)) 30 1002.5 33.418 1.3884 0.118Total 224 10403Table 3.3Pairwise post hoc tests for P.angustifolia shoot countsGroups t P valueDisturbed, Transition 4.3207 0.001Disturbed, Undisturbed 12.046 0.001Transition, Undisturbed 5.1194 0.0013.2.2 Percentage coverPercentage cover of the seabed was dominated by sand (30-87%) at the disturbed andtransition sites (Figure 3.5). The undisturbed sites were dominated by cover of seagrassP. angustifolia (34-67%), although site 10H had a significant accumulation of wrack.Other Algae SandWrack SeagrassAmphibolis SeagrassPosidiniacoriaceaSeagrassPosidiniaangustifolia100908070%cover6050403020100Figure 3.5Percentage cover by benthic categoriesPercentage cover of P. angustifolia ranged from 4% (at site 37D) to 67% (at sites SH32 andSH50). Percentage cover of P. angustifolia within each zone ranged from:Disturbed Transition Undisturbed4-22% at the disturbed sites;17-27% at the transition sites; and34-67% at the undisturbed sites.Summarised percentage cover data are included as a table in Appendix F.Statistically significant differences (P values < 0.05) in the percentage of seagrass coveroccurred amongst all zones (undisturbed, transitional and disturbed) (Table 3.4 andTable 3.5).24 Oceanica: Fremantle Ports: FP – Gage Roads Offshore Disposal Area Seagrass Recovery Project, Phase I – Initial Survey