Selenium toxicity to honey bee (apis mellifera l.) pollinators

Effects on behaviors and survival

Kristen R. Hladun, Brian Smith, Julie A. Mustard, Ray R. Morton, John T. Trumble

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

We know very little about how soil-borne pollutants such as selenium (Se) can impact pollinators, even though Se has contaminated soils and plants in areas where insect pollination can be critical to the functioning of both agricultural and natural ecosystems. Se can be biotransferred throughout the food web, but few studies have examined its effects on the insects that feed on Se-accumulating plants, particularly pollinators. In laboratory bioassays, we used proboscis extension reflex (PER) and taste perception to determine if the presence of Se affected the gustatory response of honey bee (Apis mellifera L., Hymenoptera: Apidae) foragers. Antennae and proboscises were stimulated with both organic (selenomethionine) and inorganic (selenate) forms of Se that commonly occur in Se-accumulating plants. Methionine was also tested. Each compound was dissolved in 1 M sucrose at 5 concentrations, with sucrose alone as a control. Antennal stimulation with selenomethionine and methionine reduced PER at higher concentrations. Selenate did not reduce gustatory behaviors. Two hours after being fed the treatments, bees were tested for sucrose response threshold. Bees fed selenate responded less to sucrose stimulation. Mortality was higher in bees chronically dosed with selenate compared with a single dose. Selenomethionine did not increase mortality except at the highest concentration. Methionine did not significantly impact survival. Our study has shown that bees fed selenate were less responsive to sucrose, which may lead to a reduction in incoming floral resources needed to support coworkers and larvae in the field. If honey bees forage on nectar containing Se (particularly selenate), reductions in population numbers may occur due to direct toxicity. Given that honey bees are willing to consume food resources containing Se and may not avoid Se compounds in the plant tissues on which they are foraging, they may suffer similar adverse effects as seen in other insect guilds.

Original languageEnglish (US)
Article numbere34137
JournalPLoS One
Volume7
Issue number4
DOIs
StatePublished - Apr 13 2012

Fingerprint

Honey
Bees
Selenic Acid
pollinating insects
Selenium
Apis mellifera
selenium
honey bees
Toxicity
selenates
toxicity
Sucrose
Selenomethionine
selenomethionine
sucrose
Apoidea
Methionine
Insects
methionine
proboscis

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Selenium toxicity to honey bee (apis mellifera l.) pollinators : Effects on behaviors and survival. / Hladun, Kristen R.; Smith, Brian; Mustard, Julie A.; Morton, Ray R.; Trumble, John T.

In: PLoS One, Vol. 7, No. 4, e34137, 13.04.2012.

Research output: Contribution to journalArticle

Hladun, Kristen R. ; Smith, Brian ; Mustard, Julie A. ; Morton, Ray R. ; Trumble, John T. / Selenium toxicity to honey bee (apis mellifera l.) pollinators : Effects on behaviors and survival. In: PLoS One. 2012 ; Vol. 7, No. 4.
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