Food rationing affects dietary selenium bioaccumulation and life cycle performance in the mayfly Centroptilum triangulifer

Selenium effects in nature are mediated by the relatively large bioconcentration of aqueous Se by primary producers and smaller, yet critical, dietary transfers to primary consumers. These basal processes are then propagated through food webs to higher trophic levels. Here we quantified the movement...

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Bibliographic Details
Published in:Ecotoxicology (London) 2011-11, Vol.20 (8), p.1840-1851
Main Authors: Conley, J. M., Funk, D. H., Cariello, N. J., Buchwalter, D. B.
Format: Article
Language:English
Subjects:
Animal Nutritional Physiological Phenomena
Animals
Aquatic insects
Bioaccumulation
Biological magnification
Body Weight
Dissolution
Earth and Environmental Science
Ecology
Ecotoxicology
Environment
Environmental Management
Exposure
Fecundity
Female
Fertility
Food Chain
Food resources
Food webs
Foods
Insecta - growth & development
Insecta - metabolism
Insecta - physiology
Life Cycle Stages
Measurement
Nutritional status
Ovum
Radiation
Rationing
Rations
Reduction
Resource availability
Risk assessment
Selenium
Selenium - pharmacokinetics
Toxicity
Trophic levels
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Summary:Selenium effects in nature are mediated by the relatively large bioconcentration of aqueous Se by primary producers and smaller, yet critical, dietary transfers to primary consumers. These basal processes are then propagated through food webs to higher trophic levels. Here we quantified the movement of dissolved Se (as selenite) to periphyton, and used the resultant periphyton as a food source for conducting full life-cycle dietary Se exposures to the mayfly Centroptilum triangulifer. Periphyton bioconcentrated Se ~2,200-fold from solution in a log-linear fashion over dissolved Se concentrations ranging from 1.1 to 23.1 μg L −1 . We examined the influence of two feeding ration levels ( 1x and 2x ) on trophic transfer, tissue Se concentrations, maternal transfer, and functional endpoints of mayfly performance. Mayflies fed a lesser ration ( 1x ) displayed greater trophic transfer factors (mean TTF, 2.8 ± 0.4) than mayflies fed 2x rations (mean TTF, 1.1 ± 0.3). In 1x exposures, mayflies exhibited significant ( p  
ISSN:0963-9292
1573-3017
DOI:10.1007/s10646-011-0722-1