• Publications
  • Influence
Ant-aphid mutualisms: the impact of honeydew production and honeydew sugar composition on ant preferences
The honeydew composition and production of four aphid species feeding on Tanacetum vulgare, and mutualistic relationships with the ant Lasius niger were studied, showing consistent with the ants' preference for M. fuscoviride, which produced the largest amount of Honeydew including a considerable proportion of the trisaccharides melezitose and raffinose. Expand
Aphids or their parasitoids : who actually benefits from ant-attendance?
The influence of ant-attendance on patterns of parasitism was studied for two parasitoid species attacking the black bean aphid Aphis fabae (Scop.), Trioxys angelicae (Haliday) and Lysiphlebus carduiExpand
Hyperparasitism: multitrophic ecology and behavior.
This review evaluates multitrophic relationships and hyperparasitoid ecology of various taxa of phytophagous and predacious insects, using the aphid-parasitesitoid-hyperparasite food web as a model system. Expand
Honeydew amino acids in relation to sugars and their role in the establishment of ant‐attendance hierarchy in eight species of aphids feeding on tansy (Tanacetum vulgare)
The richness of the honeydew (rate of secretion) and the presence of the attractant sugar melezitose comprised the critical factors determining the extent of ant‐attendance of the aphids feeding on T. vulgare. Expand
Behavioral and morphological adaptations of the coccinellid,Platynaspis luteorubra for exploiting ant-attended resources (Coleoptera: Coccinellidae)
  • W. Völkl
  • Biology
  • Journal of Insect Behavior
  • 1 September 1995
Fourth-instar larvae foraging in ant-attended aphid colonies had a higher success rate in capturing large prey items and benefitted from this by higher adult weights. Expand
Invitation paper: C.P. Alexander Fund. Host choice by aphidiid parasitoids (Hymenoptera: Aphidiidae): host recognition, host quality, and host value.
A conceptual model of host choice by aphidiid wasps is presented and host value varies dynamically with parasitoid state variables such as age, egg load, and prior experience. Expand
Honeydew production and honeydew sugar composition of polyphagous black bean aphid, Aphis fabae (Hemiptera: Aphididae) on various host plants and implications for ant-attendance
The results confirm the hypothesis that the sugar richness of the honeydew along with the presence of the attractant sugar melezitose are the critical factors in determining the extent of ant-attendance in A. fabae subspecies. Expand
Invasion of one insect species, Adalia bipunctata, by two different male‐killing bacteria
It is shown that the majority of the male‐killing lines tested from Central and Eastern Europe do not bear amale‐killing Rickettsia bacterium, and 16S rDNA sequence analysis suggests male‐ Killing is associated with a member of the genus Spiroplasma, which is discussed in relation to the evolutionary genetics of male‐ killing bacteria, and the evolution of male-killing behaviour in the eubacteria. Expand
Competition for mutualists in an ant - homopteran interaction mediated by hierarchies of ant attendance.
There is a competition for the mutualistic services of ants between aphid species exploiting the same resource and the outcome of this competition depends on the aphid's selective attractiveness to ants, which corresponded with already reported differences in honeydew quality and quantity. Expand