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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Thomas, Matthew B. Moore, Sarah L. Blanford, Simon Doggett, Matthew Wilson, Kenneth Simpson, Stephen J. |
| Description | Author Affiliation: Wilson K ( Institute of Biological Sciences, University of Stirling, Stirling FK9 4LA, United Kingdom. ken.wilson@stirling.ac.uk); |
| Abstract | Parasite transmission generally exhibits some form of positive density dependence. Thus, as population density increases, so too does the per capita risk of becoming infected. Under such circumstances, natural selection should favor individuals that use cues associated with population density to determine the optimal allocation of resources to disease resistance mechanisms. As a consequence, individuals experiencing crowded conditions are predicted to be more resistant to parasites and pathogens than those experiencing low-density conditions. This phenomenon (termed 'density-dependent prophylaxis') [Wilson, K. & Reeson, A. F. (1998) Ecol. Entomol. 23, 100-101] is predicted to be particularly prevalent in outbreak pest species and in species exhibiting density-dependent phase polyphenism, such as the desert locust, Schistocerca gregaria. Here we show that, as predicted, desert locusts reared under crowded conditions are significantly more resistant than solitary locusts to the entomopathogenic fungus, Metarhizium anisopliae var. acridum, a key natural disease of acridids and an important agent in locust and grasshopper biocontrol. Moreover, enhanced pathogen resistance in crowded locusts is associated with elevated antimicrobial activity, but not with any difference in thermal preferences or behavioral fever response. These results have implications for understanding the development and biocontrol of locust plagues. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 8 |
| Volume Number | 99 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2002-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Grasshoppers Physiology Animals Fever Microbiology Fungi Pathogenicity Immunology Immunity, Innate Population Density Population Dynamics Temperature Time Factors Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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