| response of the aphid parasitoid aphidius funebris to volatiles from undamaged and aphid-infested centaurea nigra. | two issues have hindered the understanding of the ecology and evolution of volatile-mediated tritrophic interactions: few studies have addressed noncrop systems; and few statistical techniques have been applied that are suitable for the analysis of complex volatile blends. in this paper, we addressed both of these issues by studying the noncrop system involving the plant centaurea nigra, the specialist aphid uroleucon jaceae, and the parasitoid aphidius funebris. in a y-tube olfactometer, a. fun ... | 2007 | 17334919 |
| secondary bacterial symbiont community in aphids responds to plant diversity. | biodiversity is important for ecosystem functioning and biotic interactions. in experimental grasslands, increasing plant species richness is known to increase the diversity of associated herbivores and their predators. if these interactions can also involve endosymbionts that reside within a plant or animal host is currently unknown. in plant-feeding aphids, secondary bacterial symbionts can have strong fitness effects on the host, e.g. resistance to natural enemies or fungal pathogens. we exam ... | 2016 | 26603858 |
| adaptive allocation of resources and life-history trade-offs in aphids relative to plant quality. | the need to allocate a limited amount of energy between different life-history traits is a fundamental assumption in life-history theory. however, it has often turned out to be extremely difficult to measure the competing processes that contribute to costs or benefits for individual organisms. the present investigation begins by analysing how an aphid clonal lineage adapts its reproductive investment to moderate changes in host plant quality (e.g. during the life cycle of its host). using centau ... | 1995 | 28306880 |
| physiological responses of uroleucon jaceae (l.) to seasonal changes in the quality of its host plant centaurea jacea l.: multilevel control of adaptations to the life cycle of the host. | exploiters of short-lived plants have evolved strategies in response to physiological changes that occur during the development of their hosts. the ability to adapt to host quality changes is necessary particularly if the mobility of an animal is poor or risk-constrained. in the plant-aphid system centaurea jaceae-uroleucon jaceae, the responses of the aphid to the seasonal changes in its host plant grown in poor and good quality soil were investigated. coarse- and fine-tuned physiological react ... | 1992 | 28313469 |