Effects of Dietary Lutein on the Parsnip Webworm, Depressaria Pastinacella (Lepidoptera: Elachistidae)
Carroll, Mark Joseph
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https://hdl.handle.net/2142/86445
Description
Title
Effects of Dietary Lutein on the Parsnip Webworm, Depressaria Pastinacella (Lepidoptera: Elachistidae)
Author(s)
Carroll, Mark Joseph
Issue Date
2003
Doctoral Committee Chair(s)
Berenbaum, May R.
Department of Study
Entomology
Discipline
Entomology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Date of Ingest
2015-09-28T15:10:34Z
Keyword(s)
Biology, Ecology
Language
eng
Abstract
I examined lutein sequestration by sixth instars from populations in western North America that experience different UV intensities, as well as host plant furanocoumarins. Total furanocoumarins and total linear furanocoumarins were negatively correlated with UV irradiance (UVI), whereas total angular furanocoumarins were not correlated. Angelicin, bergapten, isopimpinellin, and xanthotoxin were negatively correlated, sphondin was positively correlated, and imperatorin was not correlated. Populations with the parasitoid Copidosoma sosares Walker (Hymenoptera: Encyrtidae) present had lower concentrations of total furanocoumarins, linear furanocoumarins, angelicin, bergapten, imperatorin, isopimpinellin, and xanthotoxin and higher concentrations of sphondin than populations lacking this parasitoid, presumably to reduce negative effects on parasitoid fitness. Metabolism rates for five furanocoumarins did not differ among five webworm populations from New Mexico to Alberta. All displayed rates near reported maximum values. Lutein content of fruits did not vary with UVI, but lutein sequestration by sixth instars was significantly correlated with UVI. UVI, lutein sequestration, and C. sosares may all be factors that interfere with webworm-host plant interaction in these western populations.
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