UNIVERSITY OF KENTUCKY ENTOMOLOGY
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Jen WhiteJennifer White

Assistant Professor, Insect Ecology

Ph.D. University of Minnesota (2005)

 

Department of Entomology
S-225 Agricultural Science Center N
University of Kentucky
Lexington, KY 40546-0091
Ph: 859.257.6693
Fax: 859.323.1120
Email: jenwhite.uk@gmail.com or jawh222@uky.edu

Research Interests

The current focus of my laboratory is investigating the ecological, evolutionary, and behavioral effects of bacterial endosymbionts in insects. In particular, we are interested in exploring the consequences of endosymbiont infection within the context of introduced species and biological control.

 

Maternally-inherited intracellular endosymbionts are common among arthropods, with the most widespread bacterial endosymbiont, Wolbachia, recently estimated to infect 66% of arthropod species, albeit often at low prevalence within a species. Host arthropods can survive and potentially thrive without such “facultative” symbionts, and because they usually cannot be cultivated in vitro, their roles within the host remained obscure for many years. With the advent of molecular techniques, however, interest in these bacteria has escalated and it has become increasingly evident that facultative symbionts can have major effects on their host’s biology, ecological relationships, and evolutionary dynamics. For example, various facultative symbionts have been shown to: manipulate host reproduction, influence dispersal, affect host plant choice, change host temperature tolerances, alter fecundity, and provide defense against parasitoids, fungi, and viruses. There is little generality to our current understanding of symbiont effects, however. The same symbiont can cause different phenotypic effects in different host species, we know little of the mechanisms that result in an observed phenotype, and the broader ecological consequences of symbiont infection upon a host species are largely unexplored. Because many described symbiont effects would likely influence the establishment and spread of introduced species, it is clear that the presence or absence of symbionts could have important ramifications for introduced species, including biological control agents.

 

Current lab members are undertaking a number of projects that relate to this topic.

  • Cristina Brady is comparing host plant by symbiont interactions in Aphis craccivora, and introduced legume pest
  • Jason Wulff is investigating the defensive properties of Arsenophonus, a bacterial symbiont of the soybean aphid, against Hymenopteran parasitoids
  • Cheryl Lindsay is spearheading our effort to identify bacterial symbionts in important introduced species

 

Other symbiont topics I’m interested in exploring include:

  • The role of the bacterial symbiont Cardinium in spiders
  • Multi-symbiont interactions within a common host
  • Symbiont influences on the outcome of superparasitism

 

I also have ongoing interests in host/parasitoid behavior, spatial interactions, and population dynamics (even when symbionts are not involved!)

 

European Corn BorerMacrocentrus grandii
The European corn borer (Ostrinia nubilalis), left, and it's biological control agent, Macrocentrus grandii, right.
Photos: Marlin Rice (O. nubilalis); Jim Kaisch and Tom Clark, UNL Entomology (M. grandii).

 

Encarsia inaron

Information for Prospective Students

I am always seeking motivated graduate students, and have funding available for student support. Please contact me at jenwhite.uk@gmail.com if you are interested in learning more about research opportunities in my laboratory.

 

Right: Encarsia inaron, a biological control agent of the ash whitefly (Siphoninus phillyreae) and the sweet potato whitefly (Bemisia tabaci). Photo: Mike Rose.

 

Select Publications

  • White, J.A., S. Kelly, S. Perlman, M. S. Hunter. 2009. Cytoplasmic incompatibility in the parasitic wasp Encarsia inaron: disentangling the roles of Cardinium and Wolbachia symbionts. Heredity 102: 483-489.
  • Chiel E., M. Inbar, N. Mozes-Daube, J. A. White, M. S. Hunter and E. Zchori-Fein. 2009. Assessments of fitness effects by the facultative symbiont, Rickettsia, in the sweetpotato whitefly (Hemiptera: Aleyrodidae). Annals of the Entomological Society of America 102: 413-418.
  • White, J. A., and D. A. Andow. 2008. Benefits of self-superparasitism in a polyembryonic parasitoid. Biological Control 46: 133-139.
  • White, J. A., and D. A. Andow. 2007. Foraging for intermittently refuged prey: theory and field observations of a parasitoid. Journal of Animal Ecology 76: 1244-1254.
  • White, J. A., and D. A. Andow. 2006. Habitat modification contributes to associational resistance between herbivores. Oecologia 148: 482-490.
  • White, J. A., and D. A. Andow. 2005. Host-parasitoid interactions in a transgenic landscape: spatial proximity effects of host density. Environmental Entomology 34: 1493-1500.
  • White, J. A., J. P. Harmon, and D. A. Andow. 2004. Ecological context for examining the effects of transgenic crops in production systems. Journal of Crop Production 12: 457-489. Special volume: New Dimensions in Agroecology.
  • Harmon, J. P., J. A. White, and D. A. Andow. 2003. Oviposition behavior of Ostrinia nubilalis (Lepidoptera: Crambidae) in response to potential intra- and interspecific interactions. Environmental Entomology 32: 334-339.
  • White, J. A. and T. G. Whitham. 2000. Associational susceptibility of cottonwood to a box elder herbivore. Ecology 81: 1795-1803.

 

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