| effect of iridoid glycoside content on oviposition host plant choice and parasitism in a specialist herbivore. | the glanville fritillary butterfly melitaea cinxia feeds upon two host plant species in aland, finland, plantago lanceolata and veronica spicata, both of which produce iridoid glycosides. iridoids are known to deter feeding or decrease the growth rate of many generalist insect herbivores, but they often act as oviposition cues to specialist butterflies and are feeding stimulants to their larvae. in this study, two iridoid glycosides (aucubin and catalpol) were analyzed by micellar electrokinetic ... | 2003 | 12775146 |
| metapopulation genetic structure of two coexisting parasitoids of the glanville fritillary butterfly. | we investigated the metapopulation genetic structure of two specialist parasitoids, cotesia melitaearum and hyposoter horticola, attacking the glanville fritillary butterfly (melitaea cinxia) in the aland islands south-western finland. the host butterfly persists as a classic metapopulation in a network of 4,000 small habitat patches within an area of 50 by 70 km . the two parasitoids are known to differ greatly in their population dynamics and spatial pattern of occupancy in local host populati ... | 2004 | 15586293 |
| effects of quantitative variation in allelochemicals in plantago lanceolata on development of a generalist and a specialist herbivore and their endoparasitoids. | studies in crop species show that the effect of plant allelochemicals is not necessarily restricted to herbivores, but can extend to (positive as well as negative) effects on performance at higher trophic levels, including the predators and parasitoids of herbivores. we examined how quantitative variation in allelochemicals (iridoid glycosides) in ribwort plantain, plantago lanceolata, affects the development of a specialist and a generalist herbivore and their respective specialist and generali ... | 2005 | 15856784 |
| differential performance of a specialist and two generalist herbivores and their parasitoids on plantago lanceolata. | the ability to cope with plant defense chemicals differs between specialist and generalist species. in this study, we examined the effects of the concentration of the two main iridoid glycosides (igs) in plantago lanceolata, aucubin and catalpol, on the performance of a specialist and two generalist herbivores and their respective endoparasitoids. development of the specialist herbivore melitaea cinxia was unaffected by the total leaf ig concentration in its host plant. by contrast, the generali ... | 2011 | 21691810 |