02717naa a2200313 a 450000100080000000500110000800800410001902400390006010000210009924501190012026000090023950003380024852014610058665000110204765000190205865000100207765300150208765300230210265300270212570000170215270000130216970000180218270000160220070000150221670000140223170000150224570000160226077301270227610618272023-05-03       2023    bl uuuu     u00u1 u    #d7 a10.1080/00218839.2021.18885372DOI1 aBRANCHICCELA, B.  aCan pollen supplementation mitigate the impact of nutritional stress on honey bee colonies?h[electronic resource]  c2023  aArticle history:Received 27 May 2020/ Accepted 08 Dec 2020/ Published online: 11 Mar 2021.Corresponding author. Email: bbranchiccela@inia.org.uy. This work was supported by the University of the Republic,Uruguay; under grant CSIC C624 and the National Agency of Innovation and Research (ANII); under grant ANII_POS_NAC_2014_1_102247.  aAbstract: One of the main driving forces of the Apis mellifera colony losses reported worldwide is the nutritional stress associated with monoculture areas. We previously demonstrated under field conditions that nutritional stress that occurred during the fall impacts honey bee colony strength and health in the short and long-term. Pollen supplementation to colonies during a nutritionally stressful period increased adult and brood populations and decreased the infection level of Nosema ceranae. When brood production continues in the winter season, pollen supplementation during this period could be another strategy to help colonies recover from the negative impact of the nutritional stress that occurred in the fall. Thus, in this study, we analyzed if supplementing colonies with polyfloral pollen in winter could be a useful strategy to mitigate fall nutritional stress. Firstly, colonies were exposed to a natural nutritional stress scenario. Secondly, they were relocated and divided into two experimental groups: one group was supplemented with polyfloral pollen, while the other remained as a control. The strength and health of the colonies were analyzed. Pollen supplementation increased adults and brood populations in the coldest months and it did not affect the infection level of Nosema spp. or RNA viruses. These results suggest that the negative impact of nutritional stress during the fall is difficult to mitigate during the winter.  aABEJAS  aAPIS MELLIFERA  aPOLEN  aBEE HEALTH  aNUTRITIONAL STRESS  aPOLLEN SUPPLEMENTATION1 aCASTELLI, L.1 aDIAZ, S.1 aINVERNIZZI, C1 aMENDOZA, Y.1 aSANTOS, E.1 aSILVA, C.1 aZUNINO, P.1 aANTUNEZ, K,  tJournal of Apicultural Research, 2023, Volume 62, Issue 2, pp. 294-302. Doi: https://doi.org/10.1080/00218839.2021.1888537