Parasitized honey bees are less likely to forage and carry less pollen

Lach, Lori, Kratz, Madlen, and Baer, Boris (2015) Parasitized honey bees are less likely to forage and carry less pollen. Journal of Invertebrate Pathology, 130. pp. 64-71.

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Abstract

Research into loss of pollination capacity has focused primarily on documenting pollinator declines and their causes with comparatively little attention paid to how stressors may affect pollinating behavior of surviving pollinators. The European honey bee, Apis mellifera is one of the world's most important generalist pollinators, and Nosema apis is a widespread microsporidian gut parasite of adult A. mellifera. We individually fed 960 newly eclosed A. mellifera workers either a sucrose solution or 400 N. apis spores in a sucrose solution and tagged them with a unique radio frequency identification (RFID) tag to monitor their foraging behavior. We found spore-fed bees were less likely to forage than those fed sugar only. Those that did forage started foraging when they were older and stopped foraging when they were younger than bees fed sugar only. However, inoculated and non-inoculated bees did not significantly differ in the number of foraging trips taken per day, the total hours foraged over their lifetime, or homing ability. Inoculated returning foragers were 4.3 times less likely to be carrying available pollen than non-inoculated returning foragers and the number of pollen grains carried was negatively correlated with the number of N. apis spores. In an arena of artificial flowers, inoculated bees had a tendency (p = 0.061) to choose sugar flowers over pollen flowers, compared to non-inoculated bees which visited pollen and sugar flowers equally. These results demonstrate that even a relatively low dose of a widespread disease of A. mellifera may adversely affect bees' ability to pollinate.

Item ID: 40200
Item Type: Article (Research - C1)
ISSN: 1096-0805
Keywords: Apis mellifera; foraging; Nosema apis; parasite; pollination; radio-frequency identification
Funders: Australian Research Council (ARC)
Projects and Grants: ARC Future Fellowship FT 110100105, ARC Linkage Grants LP10010438, ARC Discovery Early Career Research Award 130100709
Date Deposited: 04 Sep 2015 02:34
FoR Codes: 06 BIOLOGICAL SCIENCES > 0608 Zoology > 060808 Invertebrate Biology @ 50%
06 BIOLOGICAL SCIENCES > 0608 Zoology > 060801 Animal Behaviour @ 40%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060202 Community Ecology (excl Invasive Species Ecology) @ 10%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960812 Urban and Industrial Flora, Fauna and Biodiversity @ 100%
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