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

L. El Masri, R. Schulte, N. Timmermeyer, S. Thanisch, L. Crummenerl, G. Jansen, N. Michiels, H. Schulenburg, Ecology Letters 16 (2013) 461–468.

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Journal Article | Published | English
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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.
Publishing Year
Date Published
2013-04-04
Journal Title
Ecology Letters
Volume
16
Issue
4
Page
461 - 468
IST-REx-ID

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El Masri L, Schulte R, Timmermeyer N, et al. Sex differences in host defence interfere with parasite-mediated selection for outcrossing during host-parasite coevolution. Ecology Letters. 2013;16(4):461-468. doi:10.1111/ele.12068
El Masri, L., Schulte, R., Timmermeyer, N., Thanisch, S., Crummenerl, L., Jansen, G., … Schulenburg, H. (2013). Sex differences in host defence interfere with parasite-mediated selection for outcrossing during host-parasite coevolution. Ecology Letters, 16(4), 461–468. https://doi.org/10.1111/ele.12068
El Masri, Leila, Rebecca Schulte, Nadine Timmermeyer, Stefanie Thanisch, Lena Crummenerl, Gunther Jansen, Nico Michiels, and Hinrich Schulenburg. “Sex Differences in Host Defence Interfere with Parasite-Mediated Selection for Outcrossing during Host-Parasite Coevolution.” Ecology Letters 16, no. 4 (2013): 461–68. https://doi.org/10.1111/ele.12068.
L. El Masri et al., “Sex differences in host defence interfere with parasite-mediated selection for outcrossing during host-parasite coevolution,” Ecology Letters, vol. 16, no. 4, pp. 461–468, 2013.
El Masri L, Schulte R, Timmermeyer N, Thanisch S, Crummenerl L, Jansen G, Michiels N, Schulenburg H. 2013. Sex differences in host defence interfere with parasite-mediated selection for outcrossing during host-parasite coevolution. Ecology Letters. 16(4), 461–468.
El Masri, Leila, et al. “Sex Differences in Host Defence Interfere with Parasite-Mediated Selection for Outcrossing during Host-Parasite Coevolution.” Ecology Letters, vol. 16, no. 4, Wiley-Blackwell, 2013, pp. 461–68, doi:10.1111/ele.12068.
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