Sex differences in host defence interfere with parasite-mediated selection for outcrossing during host-parasite coevolution

Masri, Leila and Schulte, Rebecca D and Timmermeyer, Nadine and Thanisch, Stefanie and Crummenerl, Lena L and Jansen, Gunther and Michiels, Nico K and Schulenburg, Hinrich (2013) Sex differences in host defence interfere with parasite-mediated selection for outcrossing during host-parasite coevolution. Ecology Letters, 16 (4). pp. 461-468. ISSN 1461-023X

[img] Text
ele12068.pdf - Published Version
Available under License Creative Commons Attribution.
[IST-2016-404-v1+1]
Download (745Kb)
Official URL: http://onlinelibrary.wiley.com/doi/10.1111/ele.120...

Abstract

The Red Queen hypothesis proposes that coevolving parasites select for outcrossing in the host. Outcrossing relies on males, which often show lower immune investment due to, for example, sexual selection. Here, we demonstrate that such sex differences in immunity interfere with parasite-mediated selection for outcrossing. Two independent coevolution experiments with Caenorhabditis elegans and its microparasite Bacillus thuringiensis produced decreased yet stable frequencies of outcrossing male hosts. A subsequent systematic analysis verified that male C. elegans suffered from a direct selective disadvantage under parasite pressure (i.e. lower resistance, decreased sexual activity, increased escape behaviour), which can reduce outcrossing and thus male frequencies. At the same time, males offered an indirect selective benefit, because male-mediated outcrossing increased offspring resistance, thus favouring male persistence in the evolving populations. As sex differences in immunity are widespread, such interference of opposing selective constraints is likely of central importance during host adaptation to a coevolving parasite.

Item Type: Article
DOI: 10.1111/ele.12068
Uncontrolled Keywords: sexual selection, Host-parasite coevolution, Bacillus thuringiensis, Bateman's principle, Caenorhabditis elegans, Ecological immunology, Red Queen hypothesis
Subjects: 500 Science > 570 Life sciences; biology
Research Group: Cremer Group
SWORD Depositor: Sword Import User
Depositing User: Sword Import User
Date Deposited: 05 Jan 2016 08:32
Last Modified: 05 Sep 2017 14:27
URI: https://repository.ist.ac.at/id/eprint/404

Actions (login required)

View Item View Item