| Density-dependent resistance of the gypsy moth Lymantria dispar to its nucleopolyhedrovirus, and the consequences for population dynamics. | |
| | |
MedLine Citation:
|
PMID: 17968593 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The processes controlling disease resistance can strongly influence the population dynamics of insect outbreaks. Evidence that disease resistance is density-dependent is accumulating, but the exact form of this relationship is highly variable from species to species. It has been hypothesized that insects experiencing high population densities might allocate more energy to disease resistance than those at lower densities, because they are more likely to encounter density-dependent pathogens. In contrast, the increased stress of high-density conditions might leave insects more vulnerable to disease. Both scenarios have been reported for various outbreak Lepidoptera in the literature. We tested the relationship between larval density and disease resistance with the gypsy moth (Lymantria dispar) and one of its most important density-dependent mortality factors, the nucleopolyhedrovirus (NPV) LdMNPV, in a series of bioassays. Larvae were reared in groups at different densities, fed the virus individually, and then reared individually to evaluate response to infection. In this system, resistance to the virus decreased with increasing larval density. Similarly, time to death was faster at high densities than at lower densities. Implications of density-resistance relationships for insect-pathogen population dynamics were explored in a mathematical model. In general, an inverse relationship between rearing density and disease resistance has a stabilizing effect on population dynamics. |
| | |
Authors:
|
James R Reilly; Ann E Hajek |
Related Documents
:
|
16429803 - New diseases and increased risk of diseases in companion animals and horses due to tran... 20360883 - Modern approaches to understanding stress and disease susceptibility: a review with spe... 3874373 - Permanent human parkinsonism due to 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (mptp)... |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2007-10-30 |
Journal Detail:
|
Title: Oecologia Volume: 154 ISSN: 0029-8549 ISO Abbreviation: Oecologia Publication Date: 2008 Jan |
Date Detail:
|
Created Date: 2007-12-10 Completed Date: 2008-04-29 Revised Date: 2008-11-21 |
Medline Journal Info:
|
Nlm Unique ID: 0150372 Medline TA: Oecologia Country: Germany |
Other Details:
|
Languages: eng Pagination: 691-701 Citation Subset: IM |
Affiliation:
|
Department of Entomology, Comstock Hall, Cornell University, Ithaca, NY, 14853-2601, USA. jrr28@cornell.edu |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Host-Pathogen Interactions / physiology* Immunity, Innate / physiology Larva / growth & development, immunology, virology Models, Biological* Moths / growth & development, immunology, virology* Nucleopolyhedrovirus / physiology* Population Density Population Dynamics Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Aboveground net primary production dynamics in a northern Chihuahuan Desert ecosystem.
Next Document: Congenital nephrotic syndrome.