Host-parasite and genotype-by-environment interactions: Temperature modifies potential for selection by a sterilizing pathogen

Suzanne E. Mitchell, Emily S. Rogers, Tom J. Little, Andrew F. Read

Research output: Contribution to journalArticle

154 Scopus citations

Abstract

Parasite-mediated selection is potentially of great importance in modulating genetic diversity. Genetic variation for resistance, the fuel for natural selection, appears to be common in host-parasite interactions, but responses to selection are rarely observed. In the present study, we tested whether environmental variation could mediate infection and determine evolutionary outcomes. Temperature was shown to dramatically alter the potential for parasite-mediated selection in two independent laboratory infection experiments at four temperatures. The bacterial parasite, Pasteuria ramosa, was extremely virulent at 20°C and 25°C, sterilizing its host, Daphnia magna, so that females often never produced a single brood. However, at 10°C and 15°C, the host-parasite interaction was much more benign, as nearly all females produced broods before becoming sterile. This association between virulence and temperature alone could stabilize coexistence and lead to the maintenance of diversity, because it would weaken parasite-mediated selection during parts of the season. Additionally, highly significant genotype-by-environment interactions were found, with changes in clone rank order for infection rates at different temperatures. Our results clearly show that the outcome of parasite-mediated selection in this system is strongly context dependent.

Original languageEnglish (US)
Pages (from-to)70-80
Number of pages11
JournalEvolution
Volume59
Issue number1
DOIs
StatePublished - Jan 2005

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Agricultural and Biological Sciences(all)

Fingerprint Dive into the research topics of 'Host-parasite and genotype-by-environment interactions: Temperature modifies potential for selection by a sterilizing pathogen'. Together they form a unique fingerprint.

  • Cite this