Table 4.
Annual mean values of bioassessment matrices of the invertebrate community in different depth zones of two segments of Lake Wicko in 2014–2015; p = significance of differences between zones (one-way ANOVA). Codes: RICH_t—number of all taxa, CHIR_t—number of taxa of chironomid larvae, EPT_t—number of Ephemeroptera + Plecoptera + Trichoptera larvae, %MolCru—percentage contributions of molluscs and large crustaceans to the total abundance of benthic macroinvertebrates, %OOC—percentage contributions of Oligochaeta/Chironomidae abundance ratio to the total abundance of benthic macroinvertebrates, BMWP—Biological Monitoring Working Party score, ASPT—average score per taxon.
| Western Segment n = 30 |
Eastern Segment n = 36 |
p | |||||
|---|---|---|---|---|---|---|---|
| Eulittoral | Infralittoral | Sublittoral | Eulittoral | Infralittoral | Sublittoral | ||
| Measures of species richness | |||||||
| RICH_t | 15 | 22 | 9 | 20 | 25 | 13 | 0.0001 |
| CHIR_t | 2 | 5 | 4 | 4 | 5 | 6 | 0.40 |
| EPT_t | 2 | 3 | 0 | 2 | 3 | 0 | 0.0001 |
| Percentage contributions of indicator groups | |||||||
| %MolCru | 7.3 | 6.3 | 0.0 | 21.7 | 13.5 | 0.0 | 0.0001 |
| %OOC | + | 0.2 | 0.1 | 0.1 | + | 0.2 | 0.005 |
| Biomonitoring indices | |||||||
| BMWP | 54 | 58 | 27 | 60 | 60 | 29 | 0.001 |
| ASPT | 3.9 | 2.8 | 3.0 | 3.2 | 2.9 | 2.2 | 0.0001 |
+ <0.1%.