CERNAS – CENTRO DE RECURSOS NATURAIS, AMBIENTE E SOCIEDADE
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- Honey bee colony loss rates in 37 countries using the COLOSS survey for winter 2019–2020: the combined effects of operation size, migration and queen replacementPublication . Gray, Alison; Adjlane, Noureddine; Arab, Alireza; Ballis, Alexis; Brusbardis, Valters; Bugeja Douglas, Adrian; Cadahía, Luis; Charrière, Jean-Daniel; Chlebo, Robert; Coffey, Mary F.; Cornelissen, Bram; Costa, Cristina Amaro Da; Danneels, Ellen; Danihlík, Jiří; Dobrescu, Constantin; Evans, Garth; Fedoriak, Mariia; Forsythe, Ivan; Gregorc, Aleš; Ilieva Arakelyan, Iliyana; Johannesen, Jes; Kauko, Lassi; Kristiansen, Preben; Martikkala, Maritta; Martín-Hernández, Raquel; Mazur, Ewa; Medina-Flores, Carlos Aurelio; Mutinelli, Franco; Omar, Eslam M.; Patalano, Solenn; Raudmets, Aivar; San Martin, Gilles; Soroker, Victoria; Stahlmann-Brown, Philip; Stevanovic, Jevrosima; Uzunov, Aleksandar; Vejsnaes, Flemming; Williams, Anthony; Brodschneider, RobertThis article presents managed honey bee colony loss rates over winter 2019/20 resulting from using the standardised COLOSS questionnaire in 37 countries. Six countries were from outside Europe, including, for the first time in this series of articles, New Zealand. The 30,491 beekeepers outside New Zealand reported 4.5% of colonies with unsolvable queen problems, 11.1% of colonies dead after winter and 2.6% lost through natural disaster. This gave an overall colony winter loss rate of 18.1%, higher than in the previous year. The winter loss rates varied greatly between countries, from 7.4% to 36.5%. 3216 beekeepers from New Zealand managing 297,345 colonies reported 10.5% losses for their 2019 winter (six months earlier than for other, Northern Hemisphere, countries). We modelled the risk of loss as a dead/empty colony or from unresolvable queen problems, for all countries except New Zealand. Overall, larger beekeeping operations with more than 50 colonies experienced significantly lower losses (p < 0.001). Migration was also highly significant (p < 0.001), with lower loss rates for operations migrating their colonies in the previous season. A higher proportion of new queens reduced the risk of colony winter loss (p < 0.001), suggesting that more queen replacement is better. All three factors, operation size, migration and proportion of young queens, were also included in a multivariable main effects quasi-binomial GLM and all three remained highly significant (p < 0.001). Detailed results for each country and overall are given in a table, and a map shows relative risks of winter loss at the regional level.
- Honey bee colony winter loss rates for 35 countries participating in the COLOSS survey for winter 2018–2019, and the effects of a new queen on the risk of colony winter lossPublication . Gray, Alison; Adjlane, Noureddine; Arab, Alireza; Ballis, Alexis; Brusbardis, Valters; Charrière, Jean-Daniel; Chlebo, Robert; Coffey, Mary F.; Cornelissen, Bram; Costa, Cristina Amaro Da; Dahle, Bjørn; Danihlík, Jiří; Dražić, Marica Maja; Evans, Garth; Fedoriak, Mariia; Forsythe, Ivan; Gajda, Anna; de Graaf, Dirk C.; Gregorc, Aleš; Ilieva, Iliyana; Johannesen, Jes; Kauko, Lassi; Kristiansen, Preben; Martikkala, Maritta; Martín-Hernández, Raquel; Medina-Flores, Carlos Aurelio; Mutinelli, Franco; Patalano, Solenn; Raudmets, Aivar; Martin, Gilles San; Soroker, Victoria; Stevanovic, Jevrosima; Uzunov, Aleksandar; Vejsnaes, Flemming; Williams, Anthony; Zammit-Mangion, Marion; Brodschneider, RobertThis article presents managed honey bee colony loss rates over winter 2018/19 resulting from using the standardised COLOSS questionnaire in 35 countries (31 in Europe). In total, 28,629 beekeepers supplying valid loss data wintered 738,233 colonies, and reported 29,912 (4.1%, 95% confidence interval (CI) 4.0–4.1%) colonies with unsolvable queen problems, 79,146 (10.7%, 95% CI 10.5–10.9%) dead colonies after winter and 13,895 colonies (1.9%, 95% CI 1.8–2.0%) lost through natural disaster. This gave an overall colony winter loss rate of 16.7% (95% CI 16.4–16.9%), varying greatly between countries, from 5.8% to 32.0%. We modelled the risk of loss as a dead/empty colony or from unresolvable queen problems, and found that, overall, larger beekeeping operations with more than 150 colonies experienced significantly lower losses (p < 0.001), consistent with earlier studies. Additionally, beekeepers included in this survey who did not migrate their colonies at least once in 2018 had significantly lower losses than those migrating (p < 0.001). The percentage of new queens from 2018 in wintered colonies was also examined as a potential risk factor. The percentage of colonies going into winter with a new queen was estimated as 55.0% over all countries. Higher percentages of young queens corresponded to lower overall losses (excluding losses from natural disaster), but also lower losses from unresolvable queen problems, and lower losses from winter mortality (p < 0.001). Detailed results for each country and overall are given in a table, and a map shows relative risks of winter loss at regional level.
- Loss rates of honey bee colonies during winter 2017/18 in 36 countries participating in the COLOSS survey, including effects of forage sourcesPublication . Gray, Alison; Brodschneider, Robert; Adjlane, Noureddine; Ballis, Alexis; Brusbardis, Valters; Charrière, Jean-Daniel; Chlebo, Robert; F. Coffey, Mary; Cornelissen, Bram; Costa, Cristina Amaro Da; Csáki, Tamás; Dahle, Bjørn; Danihlík, Jiří; Dražić, Marica Maja; Evans, Garth; Fedoriak, Mariia; Forsythe, Ivan; de Graaf, Dirk; 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, VictoriaThis 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.