Table 2. Species richness per garden (n = 35).
| Taxonomic group | Species richness | Relative abundance6 | ||||||
|---|---|---|---|---|---|---|---|---|
| Total | Mean ± SD | Range | Mean percentage ± SD | Range of percentage | Chao 1 (Chao 2) | Mean ± SD | Range | |
| All gardens | ||||||||
| Gastropods | 39 | 10.5 ± 4.0 | 5–21 | 26.8 ± 10.2 | 12.8–53.9 | 50.7 (61.1) | 97.9 ± 56.2 | 29–267 |
| Spiders | 52 | 9.3 ± 2.8 | 4–18 | 17.2 ± 5.2 | 7.4–33.3 | 58.1 (66.2) | 30.8 ± 14.5 | 11–80 |
| Spiders suppl.1 | 55 | 11.6 ± 3.0 | 6–20 | 20.4 ± 5.3 | 10.5–35.1 | NA (NA) | 88.8 ± 45.3 | 27–190 |
| Millipedes | 22 | 5.6 ± 2.3 | 2–13 | 25.3 ± 10.7 | 9.1–59.1 | 22.0 (22.0) | 196.6 ± 177.4 | 16–650 |
| Woodlice2 | 10 | 4.1 ± 1.7 | 1–8 | 40.6 ± 17.1 | 10.0–80.0 | 10.0 (10.0) | 398.1 ± 811.1 | 1–1884 |
| Ants3 | 29 | 7.9 ± 2.2 | 4–13 | 27.4 ± 7.5 | 13.8–44.8 | NA (44) | NA | NA |
| Ground beetles | 26 | 0.9 ± 1.3 | 0–5 | 3.3 ± 5.0 | 0.0–19.2 | 204.5 (244.5) | 1.1 ± 1.9 | 0–8 |
| Rove beetles | 87 | 10.7 ± 5.2 | 5–25 | 12.3 ± 5.9 | 5.7–28.7 | 119.7 (138.0) | 36.4 ± 50.8 | 8–275 |
| Total4 | 265 | 47.5 ± 9.4 | 34–66 | 18.3 ± 3.6 | 13.1–25.4 | 346.0 (384.9) | 1133.3 ± 976.9 | 400–4928 |
| Total suppl.5 | 268 | 51.2 ± 9.6 | 37–73 | 19.0 ± 3.5 | 13.7–27.0 | NA (NA) | NA | NA |
Percentages refer to the share of species of a group found in single gardens in relation to the total number of species recorded in all gardens for the respective taxonomical group. Supplemented species richness is given in italics.
1 Supplemented spider species richness includes added species for families only represented by juvenile spiders within a garden.
2 Based on adult specimens identified to species level. Including juveniles the relative abundance ranged from 1–4217 individuals.
3 Observed species richness of ants based on pitfall traps and hay baits supplemented by active search. As the latter was not quantitative, indices requiring measures of abundance could not be calculated (NA). For an overall estimate of supplemented ant species richness in all gardens we calculated the incidence-based Chao2 estimator.
4 Total species richness is based on identified adult specimens of all groups.
5 Supplemented total species richness includes added species for families only represented by juvenile spiders in a garden.
6 All gardens were sampled with standardised procedures independent of garden size. Relative abundance is therefore a proxy for the variation in density of different taxonomic groups among gardens.