Table 5 Numbers of species and individuals (mean±SD), and community indices (mean) from dredge samples in the disposal (n=12) and reference (n=12) areas (endobenthic and sessile epibenthic species only)
From: The impact of harbour sludge disposal on benthic macrofauna communities in the Weser estuary
Significancea | Disposal area (stations I–IV) | Reference area (stations VI–IX) | |||
|---|---|---|---|---|---|
Mean | ±SD | Mean | ±SD | ||
Species per site | |||||
Total | *** | 11.5 | 3.1 | 17.0 | 7.3 |
Cnidaria | ** | 2.2 | 1.3 | 3.5 | 1.6 |
Crustacea | 4.7 | 1.8 | 5.3 | 2.2 | |
Polychaeta | 0.5 | 0.9 | 1.8 | 2.6 | |
Mollusca | *** | 0.8 | 0.7 | 2.3 | 1.3 |
Individuals per site | |||||
Total | ** | 282.4 | 388.6 | 671.3 | 734.0 |
Crustacea | ** | 159.2 | 188.0 | 319.6 | 385.2 |
Polychaeta | 0.7 | 1.4 | 27.4 | 56.9 | |
Mollusca | ** | 87.6 | 210.6 | 186.2 | 418.4 |
Echinodermata | 0.6 | 1.0 | 66.5 | 116.7 | |
Community indices | |||||
Diversity | 1.5 | - | 1.4 | - | |
Species richness | 2.3 | - | 2.8 | - | |
Evenness | 0.6 | - | 0.2 | - | |