Document Detail

Biological effects of a 765-kV transmission line: exposures and thresholds in honeybee colonies.
MedLine Citation:
PMID:  7326054     Owner:  NLM     Status:  MEDLINE    
Honeybee colonies exposed under a 765-kV, 60-Hz transmission line at 7 kV/m show the following sequence of effects: 1) increased motor activity with transient increase in hive temperature; 2) abnormal propolization; 3) impaired hive weight gain; 4) queen loss and abnormal production of queen cells; 5) decreased sealed brood; and 6) poor winter survival. When colonies were exposed at 5 different E fields (7, 5.5, 4.1, 1.8, and 0.65-0.85 kV/m) at incremental distances from the line, different thresholds for biologic effects were obtained. Hive net weights showed significant dose-related lags at the following exposures: 7 kV/m, one week; 5.5 kV/m, 2 weeks; and 4.1 kV/m, 11 weeks. The two lowest exposure groups had normal weight after 25 weeks. Abnormal propolization of hive entrances did not occur below 4.1 kV/m. Queen loss occurred in 6 of 7 colonies at 7 kV/m and 1 of 7 at 5.5 kV/m, but not below. Foraging rates were significantly lower only at 7 and 5.5 kV/m. Hive weight impairment and abnormal propolization occur at lower E-field intensity than other effects and limit the "biological effects corridor" of the transmission line to approximately 23 m beyond a ground line projection of each outer phase wire. Intrahive E fields of 15-100 kV/m were measured with a displacement current sensor. Step-potential-induced currents up to 0.5 microA were measured in an electrically equivalent bee model placed on the honeycomb in a hive exposed at 7 kV/m. At 1.8 kV/m body currents were a few nanoamperes, or two orders of magnitude lower, and these colonies showed no effects. E-field versus electric shock mechanisms are discussed.
B Greenberg; V P Bindokas; J R Gauger
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Bioelectromagnetics     Volume:  2     ISSN:  0197-8462     ISO Abbreviation:  Bioelectromagnetics     Publication Date:  1981  
Date Detail:
Created Date:  1982-03-13     Completed Date:  1982-03-13     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8008281     Medline TA:  Bioelectromagnetics     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  315-28     Citation Subset:  IM    
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MeSH Terms
Bees / physiology*
Behavior, Animal*
Electromagnetic Fields / adverse effects*
Electromagnetic Phenomena / adverse effects*
Motor Activity*
Reg. No./Substance:

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