Host mating system and coevolutionary dynamics shape the evolution of parasite avoidance inCaenorhabditis eleganshost populations
| Autor: | McKenna J. Penley, Levi T. Morran |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
0301 basic medicine Defence mechanisms Biology 010603 evolutionary biology 01 natural sciences Host-Parasite Interactions Sexual Behavior Animal 03 medical and health sciences Escherichia coli Animals Selection Genetic Mating Caenorhabditis elegans Serratia marcescens Coevolution Experimental evolution Host (biology) Mating system Biological Evolution 030104 developmental biology Infectious Diseases Evolutionary biology Host-Pathogen Interactions Animal Science and Zoology Parasitology Host adaptation Adaptation |
| Zdroj: | Parasitology. 145:724-730 |
| ISSN: | 1469-8161 0031-1820 |
| Popis: | Hosts exhibit a variety of defence mechanisms against parasites, including avoidance. Both host–parasite coevolutionary dynamics and the host mating system can alter the evolutionary trajectories of populations. Does the nature of host–parasite interactions and the host mating system affect the mechanisms that evolve to confer host defence? In a previous experimental evolution study, mixed mating and obligately outcrossingCaenorhabditis eleganshost populations adapted to either coevolving or staticSerratia marcescensparasite populations. Here, we assessed parasite avoidance as a mechanism underlying host adaptation. We measured host feeding preference for the coevolved and static parasitesvspreference forEscherichia coli, to assess the evolution of avoidance behaviour within our experiment. We found that mixed mating host populations evolved a preference forE. colirelative to the static parasite strain; therefore, the hosts evolved parasite avoidance as a defence. However, mixed mating hosts did not exhibitE. colipreference when exposed to coevolved parasites, so avoidance cannot account for host adaptation to coevolving parasites. Further, the obligately outcrossing host populations did not exhibit parasite avoidance in the presence of either static or coevolved parasites. Therefore, both the nature of host–parasite interactions and the host mating system shaped the evolution of host defence. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|