Table 4.
Relative index of ‘prey’ capture success (RIPCS) values (mean ± 1 SE) for orders (Table a) and size classes (Table b) of invertebrates captured by Drosera rotundifolia plants at two ombrotrophic bogs in the UK where RIPCS calculations incorporate potential prey captured by pitfall trap or sweep net
| (a) | ||||||||||||
| Invertebrate order | ||||||||||||
| Acarina | Araneae | Coleoptera | Collembola | Diptera | Formicidae† | Hemiptera | Hymenoptera | Lepidoptera | Orthoptera | Site meanc,f | ||
| Pitfall trap | Cors Fochnoa | 0.28 (0.16) | 0.03 (0.01) | 0.25 (0.09) | 1.11 (0.47) | 5.07 (1.45) | 0.11 (0.03) | 1.13 (0.49) | 1.25 (0.39) | 1 (0) | 0 (0) | 1.2 (0.3) |
| Whixall Mossa | 3.13 (1.06) | 0.03 (0.01) | 0.73 (0.48) | 1.55 (0.78) | 9 (2.22) | 0.13 (0.02) | 0.3 (0.08) | 1 (0.19) | 0 (0) | 0.95 (0.28) | 1.37 (0.32) | |
| Overallb | 1.58 (0.64) | 0.03 (0) | 0.5 (0.26) | 1.35 (0.47) | 6.55 (1.28) | 0.12 (0.02) | 0.64 (0.22) | 1.12 (0.2) | 0.17 (0.17) | 0.85 (0.27) | ||
| Sweep net | Cors Fochnod | 1 (0) | 0.36 (0.12) | 1 (0.34) | 2 (0.23) | 4.8 (1.11) | 1.16 (0.27) | 2.17 (0.93) | 0 (0) | 1.61 (0.25) | ||
| Whixall Mossd | 0.46 (0.11) | 0.27 (0.06) | 4 (0) | 0.79 (0.07) | 3.43 (1.14) | 0.63 (0.19) | 1 (0) | 0 (0) | 0.97 (0.21) | |||
| Overalle | 0.41 (0.08) | 0.61 (0.18) | 1.39 (0.18) | 4 (0.8) | 0.86 (0.17) | 1.58 (0.49) | 0 (0) | |||||
| (b) | ||||||||||||
| Invertebrate size (mm) | ||||||||||||
| 0.0–0.9 | 1.0–1.9 | 2.0–2.9 | 3.0–3.9 | 4.0–4.9 | 5.0–5.9 | 6.0–6.9 | Site meani | |||||
| Pitfall trap | Cors Fochnog | 0.4 (0) | 4.2 (1.88) | 1.18 (0.28) | 0.29 (0.1) | 0.01 (0.01) | 0.01 (0) | 0 (0) | 0.94 (0.36) | |||
| Whixall Mossg | 4 (0.71) | 1.73 (0.76) | 0.51 (0.09) | 0.11 (0.02) | 0.05 (0.02) | 0.04 (0.02) | 0.01 (0.01) | 0.63 (0.18) | ||||
| Overallh | 3.28 (0.9) | 2.97 (1.03) | 0.85 (0.16) | 0.2 (0.05) | 0.03 (0.01) | 0.02 (0.01) | 0.01 (0.01) | 0.78 (0.2) | ||||
| Sweep net | Cors Fochnoj | 6.5 (1.75) | 3.24 (0.76) | 3.09 (1.19) | 0.97 (0.31) | 0 (0) | 0.13 (0.13) | 0 (0) | 2.46 (0.48) | |||
| Whixall Mossj | 2.62 (0.73) | 1.39 (0.15) | 0.9 (0.08) | 1.1 (0.27) | 0.38 (0.12) | 0.09 (0.07) | 0 (0) | 0.9 (0.13) | ||||
| Overallk | 4.69 (1.09) | 2.31 (0.43) | 2 (0.63) | 1.04 (0.2) | 0.24 (0.09) | 0.1 (0.06) | 0 (0) | 1.6 (0.24) | ||||
†Family level;
aLMM (2-way), interaction effect of site x invertebrate order: F (9, 131) = 2.229, p = 0.024;
bLMM (2-way), main effect of invertebrate order: F (9, 131) = 17.807, p < 0.001;
cLMM (2-way), main effect of site: F (1, 131) = 2.799, p = 0.097;
dLMM (2-way), interaction effect of site x invertebrate order: F (6, 82) = 0.768, p = 0.597;
eLMM (2-way), main effect of invertebrate order: F (8, 82) = 12.734, p < 0.001;
fLMM (2-way), main effect of site: F (1, 82) = 5.901, p = 0.017
gLMM (2-way), interaction effect of site x invertebrate size class: F(6, 111) = 1.802, p = 0.105;
hLMM (2-way), main effect of invertebrate size class: F(6, 111) = 6.894, p < 0.001;
iLMM (2-way), main effect of site: F(1, 111) = 0.015, p = 0.902;
jLMM (2-way), interaction effect of site x invertebrate size class: F(6, 100) = 2.492, p = 0.027;
kLMM (2-way), main effect of invertebrate size class: F(6, 100) = 9.592, p < 0.001;
lLMM (2-way), main effect of site: F(1, 100) = 7.147, p = 0.009