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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Record number 552013
Title Loss rates of honey bee colonies during winter 2017/18 in 36 countries participating in the COLOSS survey, including effects of forage sources
Author(s) Gray, Alison; Brodschneider, Robert; Adjlane, Noureddine; Ballis, Alexis; Brusbardis, Valters; Charrière, Jean Daniel; Chlebo, Robert; F. Coffey, Mary; Cornelissen, Bram; Amaro da Costa, Cristina; Csáki, Tamás; Dahle, Bjørn; Danihlík, Jiří; Dražić, Marica Maja; Evans, Garth; Fedoriak, Mariia; Forsythe, Ivan; Graaf, Dirk de; Gregorc, Aleš; Johannesen, Jes; Kauko, Lassi; Kristiansen, Preben; Martikkala, Maritta; Martín-Hernández, Raquel; Medina-Flores, Carlos Aurelio; Mutinelli, Franco; Patalano, Solenn; Petrov, Plamen; Raudmets, Aivar; Ryzhikov, Vladimir A.; Simon-Delso, Noa; Stevanovic, Jevrosima; Topolska, Grazyna; Uzunov, Aleksandar; Vejsnaes, Flemming; Williams, Anthony; Zammit-Mangion, Marion; Soroker, Victoria
Source Journal of Apicultural Research 58 (2019)4. - ISSN 0021-8839 - p. 479 - 485.
Department(s) Biointeractions and Plant Health
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) Apis mellifera - beekeeping - citizen science - colony winter losses - forage sources - monitoring - mortality - survey

This short article presents loss rates of honey bee colonies over winter 2017/18 from 36 countries, including 33 in Europe, from data collected using the standardized COLOSS questionnaire. The 25,363 beekeepers supplying data passing consistency checks in total wintered 544,879 colonies, and reported 26,379 (4.8%, 95% CI 4.7–5.0%) colonies with unsolvable queen problems, 54,525 (10.0%, 95% CI 9.8–10.2%) dead colonies after winter and another 8,220 colonies (1.5%, 95% CI 1.4–1.6%) lost through natural disaster. This gave an overall loss rate of 16.4% (95% CI 16.1–16.6%) of honey bee colonies during winter 2017/18, but this varied greatly from 2.0 to 32.8% between countries. The included map shows relative risks of winter loss at regional level. The analysis using the total data-set confirmed findings from earlier surveys that smaller beekeeping operations with at most 50 colonies suffer significantly higher losses than larger operations (p <.001). Beekeepers migrating their colonies had significantly lower losses than those not migrating (p <.001), a different finding from previous research. Evaluation of six different forage sources as potential risk factors for colony loss indicated that intensive foraging on any of five of these plant sources (Orchards, Oilseed Rape, Maize, Heather and Autumn Forage Crops) was associated with significantly higher winter losses. This finding requires further study and explanation. A table is included giving detailed results of loss rates and the impact of the tested forage sources for each country and overall.

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