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Stadler, Bernhard ; Mackauer, Manfred:
Influence of plant quality on interactions between the aphid parasitoid Ephedrus californicus Baker (Hymenoptera: Aphidiidae) and its host, Acyrthosiphon pisum (Harris) (Homoptera: Aphididae).
In: The Canadian Entomologist.
Bd. 128
(1996)
Heft 1
.
- S. 27-39.
ISSN 0008-347X
DOI: https://doi.org/10.4039/Ent12827-1
Abstract
We determined variations in selected life-history parameters in a tritrophic system that consisted of a plant (broad bean, Vicea faba L.), an aphid (pea aphid, Acyrthosiphon pisum), and an aphid parasitoid (Ephedrus californicus). We manipulated plant and aphid quality by growing bean plants in a high- and low-quality nutrient solution for three generations. Pea aphids adapted to reduced nutrient availability by differentially allocating resources to somatic and gonadal growth across generations. On low-quality plants, time from birth to adult increased and dry mass decreased. The number of sclerotized embryos was correlated with adult dry mass. By contrast, in E. californicus, variations in dry mass, rate of development, and number of ovarial eggs did not suggest transgenerational adaptations to resource quality as measured by aphid size. The number of mature eggs was dependent on female age. Development time varied with parasitoid sex and was independent of aphid stage at the time of death. In the low-quality treatment, males survived on average longer than females eclosing from the same kinds of host.Aphids and their parasitoids have evolved flexible life-history strategies in response to variations in plant quality. Pea aphids adapted to qualitatively variable resources by optimizing the balance between somatic and gonadal investment across successive generations. But E. californicus responded to low host quality at the level of the individual, rather than across generations; the trade-off pattern was influenced by the host's growth potential after parasitization.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER6782 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 01 Dec 2015 07:30 |
| Letzte Änderung: | 01 Dec 2015 07:30 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/23455 |