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Consortium of Swiss Academic Libraries

Reproductive conflicts and egg discrimination in a socially polymorphic ant

Meunier, Joël ; Delaplace, Luma ; Chapuisat, Michel

In: Behavioral Ecology and Sociobiology, 2010, vol. 64, no. 10, p. 1655-1663

Consortium of Swiss Academic Libraries

Analysis of Ratios in Multivariate Morphometry

Baur, Hannes ; Leuenberger, Christoph

In: Systematic Biology, 2011, vol. 60, no. 6, p. 813-825

Université de Fribourg

Analysis of Ratios in Multivariate Morphometry

Baur, Hannes ; Leuenberger, Christoph

In: Systematic Biology, 2011, p. -

The analysis of ratios of body measurements is deeply ingrained in the taxonomic literature. Whether for plants or animals, certain ratios are commonly indicated in identification keys, diagnoses, and descriptions. They often provide the only means for separation of cryptic species that mostly lack distinguishing qualitative characters. Additionally, they provide an obvious way to study...

Université de Neuchâtel

Identification of seven species of hymenopteran parasitoids of Spodoptera frugiperda, using polymerase chain reaction amplification and restriction enzyme digestion

Jourdie, Violaine ; Alvarez, Nadir ; Turlings, Ted C. J.

In: Agricultural and Forest Entomology, 2008, vol. 10, no. 2, p. 129-136

1 The fall armyworm Spodoptera frugiperda is a voracious pest of numerous crops of economic importance throughout the New World. In its native Mexico, larvae can be attacked by several species of parasitic wasps, which are candidate biological control agents against this and other lepidopteran pests. 2 We attempted to survey the parasitoid fauna on S. frugiperda in maize and...

Université de Neuchâtel

Parasotoid communities and genetic structure : host plant does not matter

Jourdie, Violaine ; Turlings, Ted (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2008 ; Th. 2050.

Plant-insect interactions have long been studied and reveal intricate mechanisms. Plants are capable of defending themselves both directly by poisoning insect herbivores and indirectly by emitting volatile compounds that are used by the natural enemies to localize their host. In response, insects have evolved strategies to defeat plant defense mechanisms. Because insect pests are affected by...

Université de Neuchâtel

Cuticle alkanes of honeybee larvae mediate arrestment of bee parasite Varroa jacobsoni

Rickli, M. ; Diehl, Peter A. ; Guerin, Patrick M.

In: Journal of Chemical Ecology, 1994, vol. 20, no. 9, p. 2437-2453

The ectoparasitic mite Varroa jacobsoni invades worker brood cells of the honeybee Apis mellifera during the last 20 hr before the cells are sealed with a wax cap. Cuticle extracts of 8-day-old worker honeybee larvae occupying such brood cells have an arrestment effect on the mite. The mites run for prolonged periods on the extract, systematically returning onto the stimulus after...