Table 1.
Correlations between mean leaf concentrations of iridoid glycosides and mean performance (larval development time, cocoon weight and pupal development time) of insect herbivores and their parasitoids on genotypes of Plantago lanceolata
| Herbivore | Parasitoid | N | Larval development time | Cocoon weight | N | Pupal development time |
|---|---|---|---|---|---|---|
| Chrysodeixis chalcites | 11 | +0.684** | −0.434 | 11 | −0.444 | |
| Cotesia marginiventris | 10 | −0.643** | +0.568* | 7 | −0.500 | |
| Hyposoter didymator | 11 | −0.050 | −0.000 | 11 | +0.219 | |
| Spodoptera exigua | 13 | −0.035 | −0.308 | 11 | +0.726** | |
| Cotesia marginiventris | 13 | −0.232 | +0.214 | 13 | −0.590** | |
| Hyposoter didymator | 7 | −0.466 | −0.286 | 4 | +0.093 | |
| Melitaea cinxia | 21 | +0.220 | −0.047 | 11 | −0.263 | |
| Cotesia melitaearum | 8 | +0.198 | −0.082 | 6 | +0.133 |
N = Number of P. lanceolata genotypes included in the analysis
*P < 0.10; **P < 0.05