How do familiarity and relatedness influence mate choice in Armadillidium vulgare?

PLoS One. 2018 Dec 31;13(12):e0209893. doi: 10.1371/journal.pone.0209893. eCollection 2018.

Abstract

Mate choice is an important process in sexual selection and usually prevents inbreeding depression in populations. In the terrestrial isopod Armadillidium vulgare, the close physical proximity between individuals may increase the risk of reproducing with siblings. Moreover, individuals of this species can be infected with the feminizing bacteria of Wolbachia, which influence male mate choice. However, little is known about the kinship or familiarity assessment of the selected partner that occurs when a male can choose between females with or without Wolbachia. To investigate the potential mechanisms leading to mate choice and the potential impact of the parasite, we performed behavioral choice tests on males where they could choose between sibling vs. nonsibling females, familiar vs. unfamiliar females, and sibling familiar vs. unfamiliar nonsibling females. To investigate the costs of inbreeding, we compared the reproductive success of both sibling and nonsibling mates. Our results revealed that male copulation attempts were higher for familiar females and for nonsibling females when both females were Wolbachia-infected, but the duration was longer when both females were Wolbachia-free. When males mated with a sibling female, their fecundity was severely decreased, consistent with inbreeding depression. Overall, we observed copulations with all types of females and demonstrated discrimination capacities and potential preferences. We highlight the complexity of the tradeoff between kinship, familiarity and parasite transmission assessment for mate choice.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Female
  • Isopoda / microbiology
  • Isopoda / physiology*
  • Male
  • Mating Preference, Animal / physiology*
  • Wolbachia

Grants and funding

This work was supported by the 2015-2020 State-Region Planning Contracts (CPER), the European Regional Development Fund (FEDER); by the European Commission through the programme Erasmus Mundus Master Course – international Master in Applied Ecology (EMMC – IMAE) (FPA 2023 – 0224/ 532524-1-FR-2012-1-ERA MUNDUS-EMMC) – Coordination F-J Richard, Unviersité de Poitiers, France; and intramural funds from the Center National de la Recherche Scientifique and the Université de Poitiers. The doctoral studies of Margot Fortin were funded by the Région Nouvelle-Aquitaine. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.