Search Results - "Wolfgang VÖLKL"

Restoration of the Upper Main and Rodach rivers – The success and its measurement by Lüderitz, Volker, Speierl, Thomas, Langheinrich, Uta, Völkl, Wolfgang, Gersberg, Richard M.

“…Large-scale restoration of streams and rivers is a mandatory prerequisite for the implementation of the European Water Framework Directive (WFD) to reach good…”
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Ant-aphid mutualisms: the impact of honeydew production and honeydew sugar composition on ant preferences by Volkl, W, Woodring, J, Fischer, M, Lorenz, M.W, Hoffmann, K.H

“…The honeydew composition and production of four aphid species feeding on Tanacetum vulgare, and mutualistic relationships with the ant Lasius niger were…”
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Honeydew production and honeydew sugar composition of polyphagous black bean aphid, Aphis fabae (Hemiptera: Aphididae) on various host plants and implications for ant-attendance by Melanie K. FISCHER, Wolfgang VÖLKL, Klaus H. HOFFMANN

“…The black bean aphid, Aphis fabae, is polyphagous and its life cycle involves seasonal migration between summer and winter host plants. The aphids are…”
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Competition for mutualists in an ant-homopteran interaction mediated by hierarchies of ant attendance by Fischer, Melanie K., Hoffmann, Klaus H., Völkl, Wolfgang

“…Workers of the ant species Lasius niger showed marked preferences when collecting honeydew from three aphid species living on tansy, Tanacetum vulgare…”
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Mating Strategies in Solitary Aphid Parasitoids: Effect of Patch Residence Time and Ant Attendance by Nyabuga, Franklin N., Völkl, Wolfgang, Schwörer, Ulrich, Weisser, Wolfgang W., Mackauer, Manfred

“…Mate finding and dispersal from the natal patch in parasitoid Hymenoptera are influenced by the availability of host resources and interactions with other…”
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Age-specific patterns in honeydew production and honeydew composition in the aphid Metopeurum fuscoviride: implications for ant-attendance by Fischer, Melanie K., Völkl, Wolfgang, Schopf, Reinhard, Hoffmann, Klaus H.

“…The intensity of the mutualistic relationship between aphids and ants depends mainly on the composition and amount of honeydew. We used the model system…”
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Aphids or Their Parasitoids: Who Actually Benefits from Ant-Attendance? by Volkl, Wolfgang

“…1. The influence of ant-attendance on patterns of parasitism was studied for two parasitoid species attacking the black bean aphid Aphis fabae (Scop.), Trioxys…”
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Sex ratio shift caused by hyperparasitism in the solitary parasitoid Lysiphlebus hirticornis (Hymenoptera: Braconidae: Aphidiinae) by Manfred MACKAUER, Wolfgang VÖLKL

“…We examined the influence of offspring mortality caused by hyperparasitism on the secondary sex ratio of Lysiphlebus hirticornis Mackauer, a solitary…”
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Behavioral and morphological adaptations of the coccinellid, Platynaspis luteorubra for exploiting ant-attended resources (Coleoptera: Coccinellidae) by Voelkl, W

“…Larvae of the coccinellid Platynaspis luteorubra were found significantly more often in ant-attended aphid colonies than in unattended colonies. The larva of…”
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HYPERPARASITISM: Multitrophic Ecology and Behavior by Sullivan, Daniel J, Völkl, Wolfgang

“…Hyperparasitoids are secondary insect parasitoids that develop at the expense of a primary parasitoid, thereby representing a highly evolved fourth trophic…”
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The ant-associations and diet of the ladybird Coccinella magnifica (Coleoptera: Coccinellidae) by John J. SLOGGETT, Wolfgang VÖLKL, Werner SCHULZE, J. Hinrich G.v.d. SCHULENBURG, Michael E.N. MAJERUS

“…The ladybird Coccinella magnifica is typically considered to be myrmecophilous, and primarily associated with the Formica rufa group of wood ants. It is…”
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The effect of ant-attendance on the foraging behaviour of the aphid parasitoid Lysiphlebus cardui [Aphis fabae cirsiiacanthoidis] by Voelkl, W. (Bayreuth Univ. (Germany). Dept. of Animal Ecology)

“…Ant-attended and unattended colonies of the aphid Aphis fabae cirsiiacanthoidis differ in their quality for the aphid parasitoid Lysiphlebus cardui, with…”
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Ameisen als Schlüsseltiere in einem Grasland—Studien zu ihrer Bedeutung für die Tiergemeinschaft, das Nahrungsnetz und das Ökosystem (Ants as Keystone Species in a Dry Grassland: Studies of their Importance for Animal Community, Food Web and Ecosystem Function), C. Platner. Biodiversity and Ecology Series 1. Universitätsverlag Göttingen (2006). 170pp., €16, ISBN:978-3-938616-05-5 by Völkl, Wolfgang

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Behavioral strategies of aphid hyperparasitoids to escape aggression by honeydew-collecting ants by Hubner, G. (Universitat Bayreuth, Bayreuth, Germany.), Volkl, W

“…We analyzed the behavioral interactions between two species of honeydew-collecting ants (Lasius niger, Myrmica laevinodis) and foraging females of four species…”
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Molecular markers indicate rare sex in a predominantly asexual parasitoid wasp by Belshaw, R, Quicke, D.L.J, Volkl, W, Godfray, H.C.J

“…The parasitoid wasp genus Lysiphlebus (Hymenoptera: Braconidae: Aphidiinae) contains a taxonomically poorly resolved group of both sexual (arrhenotokous)…”
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Vertical food web interactions: evolutionary patterns and driving forces / K. Dettner, G. Bauer, W. Völkl, eds by Dettner, K, Bauer, G, Völkl, Wolfgang

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Interactions betweenAlloxysta brevis (Hymenoptera, Cynipoidea, Alloxystidae) and honeydew-collecting ants: How an aphid hyperparasitoid overcomes ant aggression by chemical defense by Völkl, W, Hübner, G, Dettner, K

“…Foraging females of the aphid hyperparasitoidAlloxysta brevis were attacked by honeydew-collecting workers of the antLasius niger at the first encounter…”
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The Importance of Adverse Weather Conditions for Behaviour and Population Ecology of an Aphid Parasitoid by Weisser, Wolfgang W., Volkl, Wolfgang, Hassell, Michael P.

“…1. Weather conditions are known to influence insect behaviour and population dynamics. We investigated how wind and rain affect reproductive success and…”
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Brood-size and sex-ratio variation in field populations of three species of solitary aphid parasitoids (Hymenoptera: Braconidae, Aphidiinae) by Mackauer, M, Volkl, W

“…Solitary parasitoids of colony-forming hosts may produce quasi-gregarious broods, which favours sibmating on the natal patch and local mate competition (LMC)…”
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Interactions between extrafloral nectaries, aphids and ants: are there competition effects between plant and homopteran sugar sources? by Engel, Volker, Fischer, Melanie K, Wäckers, Felix L, Völkl, Wolfgang

“…Broad bean (Vicia faba), an annual plant bearing extrafloral nectaries (EFN) at the base of the upper leaves, is regularly infested by two aphid species, Aphis…”
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