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Gloria DeGrandi-Hoffman
Agricultural Research Service
95Publications
24H-index
1,802Citations
Publications 95
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Colonies of Apis mellifera provided with natural forage show decreased pathogen loads and increased overwintering success when compared with colonies provisioned with supplemental protein diets. Despite the potential benefits of a pollen-based diet, protein supplements are commonly used in colonies throughout the spring and increasingly through the fall and winter as the cost of pollen is greater than that of supplements and concerns exist over the potential for pollen to vector viruses to bee c...
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#1Gloria DeGrandi-Hoffman (ARS: Agricultural Research Service)H-Index: 24
#2Henry Graham (ARS: Agricultural Research Service)H-Index: 2
Last.Nick Ziolkowski (ARS: Agricultural Research Service)H-Index: 1
view all 5 authors...
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#1Jianghong Li (Fujian Agriculture and Forestry University)H-Index: 2
#2Matthew C. Heerman (ARS: Agricultural Research Service)H-Index: 2
Last.Yanping Chen (ARS: Agricultural Research Service)H-Index: 37
view all 12 authors...
Nutrition is involved in regulating multiple aspects of honeybee biology such as caste, immunity, lifespan, growth and behavioral development. Deformed wing virus (DWV) is a major pathogenic factor which threatens honeybee populations, and its replication is regulated by nutrition status and immune responses of honeybees. The alimentary canal of the honeybee is home to a diverse microbial community that provides essential nutrients and serves to bolster immune responses. However, to what extent ...
1 CitationsSource
#1Yazhou ZhaoH-Index: 2
#2Matthew C. HeermanH-Index: 2
Last.Yanping ChenH-Index: 37
view all 15 authors...
The synergistic interactions between the ectoparasitic mite Varroa destructor and Deformed wing virus (DWV) lead to the reduction in lifespan of the European honey bee Apis mellifera and often have been implicated in colony losses worldwide. However, to date, the underlying processes and mechanisms that form the multipartite interaction between the bee, mite, and virus have not been fully explained. To gain a better understanding of honey bees’ defense response to Varroa mite infestation and DWV...
2 CitationsSource
#2Julia H. BowsherH-Index: 11
Last.Ashley St. ClairH-Index: 1
view all 16 authors...
2 CitationsSource
#1Farida Azzouz-Olden (Kentucky State University)H-Index: 1
#2Arthur G. Hunt (UK: University of Kentucky)H-Index: 33
Last.Gloria DeGrandi-Hoffman (ARS: Agricultural Research Service)H-Index: 24
view all 3 authors...
Bees are confronting several environmental challenges, including the intermingled effects of malnutrition and disease. Intuitively, pollen is the healthiest nutritional choice, however, commercial substitutes, such as Bee-Pro and MegaBee, are widely used. Herein we examined how feeding natural and artificial diets shapes transcription in the abdomen of the honey bee, and how transcription shifts in combination with Nosema parasitism. Gene ontology enrichment revealed that, compared with poor die...
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#1Gloria DeGrandi-Hoffman (ARS: Agricultural Research Service)H-Index: 24
#2Stephanie L. Gage (ARS: Agricultural Research Service)H-Index: 5
Last.Nick Ziolkowski (ARS: Agricultural Research Service)H-Index: 1
view all 13 authors...
Abstract Free-ranging herbivores have yearly life cycles that generate dynamic resource needs. Honey bee colonies also have a yearly life cycle that might generate nutritional requirements that differ between times of brood rearing and colony expansion in the spring and population contraction and preparation for overwintering in the fall. To test this, we analyzed polyfloral mixes of spring and fall pollens to determine if the nutrient composition differed with season. Next, we fed both types of...
6 CitationsSource
#1Stephanie L. Gage (ARS: Agricultural Research Service)H-Index: 5
#2Fabiana AhumadaH-Index: 3
Last.Gloria DeGrandi-Hoffman (ARS: Agricultural Research Service)H-Index: 24
view all 5 authors...
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We employ Monte Carlo simulation and sensitivity analysis techniques to describe the population dynamics of pesticide exposure to a honey bee colony using the VarroaPop + Pesticide model. Simulations are performed of hive population trajectories with and without pesticide exposure to determine the effects of weather, queen strength, foraging activity, colony resources, and Varroa populations on colony growth and survival. The daily resolution of the model allows us to conditionally identify sens...
1 CitationsSource
#1Stephanie L. Gage (UA: University of Arizona)H-Index: 5
#2Catherine Kramer (UA: University of Arizona)
Last.Gloria DeGrandi-Hoffman (UA: University of Arizona)H-Index: 24
view all 6 authors...
ABSTRACT Nosema sp. is an internal parasite of the honey bee, Apis mellifera , and one of the leading contributors to colony losses worldwide. This parasite is found in the honey bee midgut and has profound consequences for the host9s physiology. Nosema sp. impairs foraging performance in honey bees, yet, it is unclear whether this parasite affects the bee9s neurobiology. In this study, we examined whether Nosema sp. affects odor learning and memory and whether the brains of parasitized bees sho...
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