Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Bijen veredelen vergt kunst- en vliegwerk
Blacquiere, Tjeerd - \ 2018

Imkers houden bijen, maar het veredelen van deze sociale insecten is een vak apart. Een wereld met bevruchtingsstations, babyvolken en bastaarden.

Maisstuifmeel en honingbijen
Dooremalen, J.A. van; Blacquiere, T. - \ 2018
De Vlaamse Imker 22 (2018)7. - ISSN 1378-5095 - p. 30 - 31.
Hygiënisch gedrag tegen de Varroamijt
Blacquiere, T. - \ 2018
Bijen@wur
Bij Varroa sensitief hygiënisch gedrag (VSH) herkennen werksters gesloten cellen met poppen die een reproducerende mijt herbergen. Zo kunnen bijenvolken de

voortplanting van de varroamijt verstoren, maar wel ten koste van de geparasiteerde pop.
Lithium ionen als nieuw middel tegen Varroa?
Blacquiere, T. - \ 2018
Bijen@wur
Lithium ionen als nieuw middel tegen Varroa?
Om maar meteen met de deur in huis te vallen: NOG NIET! Maar de publicatie van de universiteit van Hohenheim geeft wel aanleiding tot de bijna gulzig te noemen reacties van imkers overal, maar er zijn nog wat stappen te nemen.



College Societal impact of your Research
Blacquiere, Tjeerd - \ 2018
College in kader Societal impact Research Course
Het Bijenonderzoek van Wageningen UR
Blacquiere, Tjeerd - \ 2018
Presentatie voor Raad van Toezicht en Raad van Bestuur WUR
Let nature decide: Darwin’s black boxes to select for Varroa resistance.
Blacquiere, Tjeerd - \ 2018
Invasieve soort Varroa destructor: tijd voor een andere strategie.
Blacquiere, Tjeerd - \ 2018
Darwinian Black Bee Box set in motion.
Blacquiere, Tjeerd - \ 2018
Lord of the Rings, results from NL.
Blacquiere, Tjeerd - \ 2018
Plea: use honey bees’ natural resilience.
Blacquiere, Tjeerd - \ 2018
WeBInar
Natural selection for Varroa resistance: new project has started.
Blacquiere, Tjeerd - \ 2018
Rewilding Hony bees in the Netherlands.
Blacquiere, Tjeerd - \ 2018
Natural selection for Varroa resistance: new project has started.
Blacquiere, Tjeerd - \ 2018
Darwin’s black bee box leads to several traits of Varroa resistance.
Blacquiere, Tjeerd - \ 2018
Co-evolution in Darwin’s black bee box.
Blacquiere, Tjeerd - \ 2018
Natuurlijke selectie van Varroa-resistentie.
Blacquiere, Tjeerd - \ 2018
Bioassays to Quantify Hygienic Behavior in Honey Bee (Apis Mellifera L.) Colonies : A Review
Leclercq, Gil ; Francis, Frédéric ; Gengler, Nicolas ; Blacquière, Tjeerd - \ 2018
Journal of Apicultural Research 57 (2018). - ISSN 0021-8839 - p. 663 - 673.
Apis mellifera - Ascosphaera apis - bioassays - hygienic behavior - Paenibacillus larvae - Varroa destructor

Individual immunity in honey bees (Apis mellifera L.) is complemented by highly evolved social behaviors. Among them, hygienic behavior has a key role involving the detection and removal of unhealthy or dead brood. Since the 1960s, several bioassays have been developed to quantify the hygienic behavior of honey bee colonies against chalkbrood, American foulbrood, and varroa infested brood. Here, we review the five main bioassays used since the late 1960s. We describe their advantages and disadvantages, including a special focus on their inherent biases. For each assay, we also discuss whether or not their use should be restricted to quantify the hygienic behavior against chalkbrood, or American foulbrood, or varroa infested brood. Overall, the bioassays involving the removal of freeze-killed brood are recommended over the bioassays relying on the removal of pin-killed brood but only for the quantification of hygienic behavior toward chalkbrood and American foulbrood. These bioassays are not recommended to quantify the hygienic behavior toward varroa infested brood, for which an accurate assessment should rely on assays based on the removal of brood artificially infested with varroa mites. Choosing an appropriate bioassay is crucial for an accurate assessment of the hygienic behavior against a defined pathogen, depending on the research question, or the goal of the breeding program. Bioensayos para cuantificar el comportamiento higiénico en las colonias de abejas melíferas (Apis mellifera L.): una revisión La inmunidad individual de las abejas melíferas (Apis mellifera L.) se complementa con comportamientos sociales altamente evolucionados. Entre ellos, el comportamiento higiénico tiene un papel clave en la detección y eliminación de crías enfermas o muertas. Desde la década de 1960, se han desarrollado varios bioensayos para cuantificar el comportamiento higiénico de las colonias de abejas melíferas frente a la cría infestada de Ascosfera, loque americana y varroa. Aquí revisamos los cinco principales bioensayos utilizados desde finales de la década de 1960. Describimos sus ventajas y desventajas, incluyendo un enfoque especial en sus sesgos inherentes. Para cada ensayo, también discutimos si su uso debe ser restringido o no para cuantificar el comportamiento higiénico contra la cría de loque americana o la cría infestada de varroa. En general, los bioensayos que involucran la eliminación de la cría muerta por congelación son más recomendables que los bioensayos que dependen de la eliminación de la cría muerta por pin, pero sólo para la cuantificación del comportamiento higiénico hacia la cría infestada de Ascosfera y la loque americana. Estos bioensayos no se recomiendan para cuantificar el comportamiento higiénico de la cría infestada de varroa, para lo cual una evaluación precisa debe basarse en ensayos basados en la extracción de la cría infestada artificialmente con ácaros de la varroa. La elección de un bioensayo apropiado es crucial para una evaluación precisa del comportamiento higiénico frente a un patógeno definido, dependiendo de la pregunta de investigación o del objetivo del programa de cría.

Single and interactive effects of Varroa destructor, Nosema spp., and inidacloprid on honey bee colonies (Apis mellifera)
Dooremalen, J.A. van; Cornelissen, A.C.M. ; Hok Ahin, C.H. ; Blacquiere, T. - \ 2018
Ecosphere 9 (2018)8. - ISSN 2150-8925
colony losses - colony size - colony survival - field-realistic exposure - pesticides - stressor
High losses of honey bee colonies in recent decades are of great societal and economical concern and experienced as a sign of the vulnerability of the environment, including the service of crop pollination, and of the beekeeping sector. There is no single cause for the colony losses, but many contributing stressors may act in concert. Varroa destructorinfestation is acknowledged as an important cause of these losses. The roles of infestation by Nosema ceranae or exposure to insecticides are controversial. Interactions between exposure to pesticides and V. destructor or Nosema spp. have previously been implicated. In two years of field experiments, we studied the effects of and possible interactions between the stressors V. destructor infestation, Nosema spp. infestation, and chronic sublethal exposure to a field‐realistic dose of the insecticide imidacloprid on the performance and survival of honey bee colonies. Colonies highly infested by V. destructorwere 13% smaller in size and were 59.1 times more likely to die than colonies infested with low levels of V. destructor. Infestation with high levels of Nosema sp. led to 2% decrease in size and 1.4 times higher likelihood to die compared to colonies with low levels of Nosema sp. No effects of chronic sublethal exposure to imidacloprid on colony size or survival were found in this study. Exposure to V. destructor and imidacloprid led to a slightly higher fraction of bees infested with Nosema sp., but in contrast to the expectations, no resulting interactions were found for colony size or survival. Colonies as a superorganism may well be able to compensate at the colony level for sublethal negative effects of stressors on their individuals. In our experimental study under field‐realistic exposure to stressors, V. destructor was by far the most lethal one for honey bee colonies.
Ein Plädoyer für den Einsatz der natürlichen Widerstandsfähigkeit der Honigbienen in der Bienenhaltang and -zucht
Blacquière, T. ; Panziera, Delphine - \ 2018
Wageningen : Wageningen University & Research - 11 p.
Übersetzung ins Deutsche von Claudia Blauert aus der englischen Originalversion von: Tjeerd Blacquière & Delphine Panziera (2018) A Plea for Use of Honey Bees’ Natural Resilience in Beekeeping, Bee World, 95:2, 34-38, DOI: 10.1080/0005772X.2018.1430999
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