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Western honey bees ( Apis mellifera ) face an increasing number of challenges that in recent years have led to significant economic effects on apiculture, with attendant consequences for agriculture. Nosemosis is a fungal infection of honey bees caused by either  Nosema apis  or  N. ceranae . The putative greater virulence of  N. ceranae  has spurred interest in understanding how it differs from  N. apis . Little is known of effects of  N. apis  or  N. ceranae  on honey bee learning and memory. Following a Pavlovian model that relies on the proboscis extension reflex, we compared acquisition learning and long-term memory recall of uninfected (control) honey bees versus those inoculated with  N. apis ,  N. ceranae , or both. We also tested whether spore intensity was associated with variation in learning and memory. Neither learning nor memory differed among treatments. There was no evidence of a relationship between spore intensity and learning, and only limited evidence of a negative effect on memory; this occurred only in the co-inoculation treatment. Our results suggest that if  Nosema  spp. are contributing to unusually high colony losses in recent years, the mechanism by which they may affect honey bees is probably not related to effects on learning or memory, at least as assessed by the proboscis extension reflex.

Effects of Nosema apis, N. ceranae, and coinfections on honey bee (Apis mellifera) learning and memory