Effects of Dietary Lutein on the Parsnip Webworm, Depressaria Pastinacella (Lepidoptera: Elachistidae)

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Entomology

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Carroll, Mark Joseph

Contributors dc:contributor

• Berenbaum, May R.

• Biology, Ecology

Language dc:language

eng

Identifier

(MiAaPQ)AAI3101810

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/86445