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Ovipositional Response, Developmental Effects and Toxicity of Hexavalent Chromium to Megaselia scalaris, a Terrestrial Detritivore

Content Provider	Springer Nature Link
Author	Trumble, John T. Jensen, Peter D.
Copyright Year	2004
Abstract	The effects of hexavalent chromium (Cr VI) on ovipositional response, development, and survival of a common terrestrial detritivore, Megaselia scalaris (Diptera: Phoridae), were assessed in the laboratory. Ovipositing females did not discriminate between substrates containing 0, 50, 500, or 1000 µg/g, indicating a lack of avoidance behavior. Eggs placed on artificial diets containing up to 1000 µg/g either did not absorb Cr VI or were unaffected as measured by eclosion rates. However, development and survival of larvae were significantly reduced at the higher concentrations tested. Concentrations of 500 µg/g in their food increased larval development times by nearly 65%. At 1000 µg/g, larval developmental times doubled. The time required from onset to completion of pupariation was not significantly different regardless of Cr VI concentration. Although males eclosed before females, there was no significant difference between the sexes in the time required for adult eclosion. In addition, there were no signifi- cant differences in the percentage of males and females emerging from any of the treatments. At concentrations of 500 or 1000 µg/g, Cr VI decreased larval survival. Survival was reduced by 44.3% at 500 µg/g as compared with the controls. There was no additional mortality from the onset of the puparial stage to adult eclosion for larvae fed diets containing 500 µg/g Cr VI. At 1000 µg/g Cr VI, larval survival decreased by 86.6%. An additional 7.4% mortality was recorded in the puparial stage, for a decrease in total survival (larval plus puparial stages) of 94%. Thus, nearly all of the observed mortality occurred during the larval stage rather than the puparial stage. The population level implications of lack of avoidance of contaminated food and the effects of increased developmental times and reduced survivorship are discussed.
Starting Page	372
Ending Page	376
Page Count	5
File Format	PDF
ISSN	00904341
Journal	Archives of Environmental Contamination and Toxicology
Volume Number	46
Issue Number	3
e-ISSN	14320703
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Pollution Health, Toxicology and Mutagenesis Medicine Toxicology

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Ovipositional Response, Developmental Effects and Toxicity of Hexavalent Chromium to Megaselia scalaris, a Terrestrial Detritivore

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