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The best timing of mate search in Armadillidium vulgare (Isopoda, Oniscidea).

Beauché F, Richard FJ - PLoS ONE (2013)

Bottom Line: We found that the attractiveness of individuals was mediated by short-distance chemical cues and tested individuals were able to discriminate and prefer individuals of the opposite sex.Moreover, male preference to female increased during their moulting status as they matured.Males were particularly more attracted by females with appearing white calcium plates, which corresponds to the beginning of their higher receptivity period.

View Article: PubMed Central - PubMed

Affiliation: Université de Poitiers, Laboratoire Ecologie et Biologie des Interactions, UMR CNRS 7267, Equipe Ecologie Evolution Symbiose, Poitiers, France. Freddie.jeanne.richard@univ-poitiers.fr

ABSTRACT
Mate choice is mediated by many components with the criteria varying across the animal kingdom. Chemical cues used for mate attractiveness can also reflect mate quality. Regarding the gregarious species Armadillidium vulgare (isopod crustacean), we tested whether individuals can discriminate conspecifics at two different levels (between sex and physiological status) based on olfactory perception. Tested conspecifics were individuals of the same or opposite sex, with the females at different moult stages. We found that the attractiveness of individuals was mediated by short-distance chemical cues and tested individuals were able to discriminate and prefer individuals of the opposite sex. Moreover, male preference to female increased during their moulting status as they matured. Males were particularly more attracted by females with appearing white calcium plates, which corresponds to the beginning of their higher receptivity period. These differences in attractiveness due to sex and physiological status are likely to shape the composition of aggregates and facilitate mate finding and optimize the reproductive success for both males and females. Thus aggregation pheromones could be linked to sex pheromones in terrestrial isopods.

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Related in: MedlinePlus

Time spent by males in the right and left sections depending of the sex and the moulting status of the conspecific present in the adjacent section.(F: female, M: male; C/D0 : di-ecdysis and beginning of pre-ecdysis (no calcium plates), D1: middle of pre-ecdysis (appearance of calcium plates), D2–4: end of pre-ecdysis (advanced calcium plates), see fig. 1; NS: non-significant p≥0.05, ***: p<0.001).
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pone-0057737-g004: Time spent by males in the right and left sections depending of the sex and the moulting status of the conspecific present in the adjacent section.(F: female, M: male; C/D0 : di-ecdysis and beginning of pre-ecdysis (no calcium plates), D1: middle of pre-ecdysis (appearance of calcium plates), D2–4: end of pre-ecdysis (advanced calcium plates), see fig. 1; NS: non-significant p≥0.05, ***: p<0.001).

Mentions: Males spent significantly more time in front of the section housing a female in advanced di-ecdysis (C/D0) than in front of the section with another male (Wilcoxon: T = 36, N = 20, P = 0.005; figure 4). However, this was not observed when the target female was in pre-ecdysis i.e. with advanced white plates and calcium deposit (D2–4) (Wilcoxon: T = 98, N = 20, P = 0.397; figure 4). When the male had to choose between a female without white plates in early di-ecdysis (C/D0) and one in pre-ecdysis (D2–4), there was no significant preference (Wilcoxon: T = 131, N = 25, P = 0.198; figure 4). However, when the choice test was between a female in di-ecdysis (C/D0) and a female with appearing white plates (D1) the males spent significantly more time in the section close to the female D1 (Wilcoxon: T = 3, N = 10, P = 0.0063; figure 4).


The best timing of mate search in Armadillidium vulgare (Isopoda, Oniscidea).

Beauché F, Richard FJ - PLoS ONE (2013)

Time spent by males in the right and left sections depending of the sex and the moulting status of the conspecific present in the adjacent section.(F: female, M: male; C/D0 : di-ecdysis and beginning of pre-ecdysis (no calcium plates), D1: middle of pre-ecdysis (appearance of calcium plates), D2–4: end of pre-ecdysis (advanced calcium plates), see fig. 1; NS: non-significant p≥0.05, ***: p<0.001).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3585876&req=5

pone-0057737-g004: Time spent by males in the right and left sections depending of the sex and the moulting status of the conspecific present in the adjacent section.(F: female, M: male; C/D0 : di-ecdysis and beginning of pre-ecdysis (no calcium plates), D1: middle of pre-ecdysis (appearance of calcium plates), D2–4: end of pre-ecdysis (advanced calcium plates), see fig. 1; NS: non-significant p≥0.05, ***: p<0.001).
Mentions: Males spent significantly more time in front of the section housing a female in advanced di-ecdysis (C/D0) than in front of the section with another male (Wilcoxon: T = 36, N = 20, P = 0.005; figure 4). However, this was not observed when the target female was in pre-ecdysis i.e. with advanced white plates and calcium deposit (D2–4) (Wilcoxon: T = 98, N = 20, P = 0.397; figure 4). When the male had to choose between a female without white plates in early di-ecdysis (C/D0) and one in pre-ecdysis (D2–4), there was no significant preference (Wilcoxon: T = 131, N = 25, P = 0.198; figure 4). However, when the choice test was between a female in di-ecdysis (C/D0) and a female with appearing white plates (D1) the males spent significantly more time in the section close to the female D1 (Wilcoxon: T = 3, N = 10, P = 0.0063; figure 4).

Bottom Line: We found that the attractiveness of individuals was mediated by short-distance chemical cues and tested individuals were able to discriminate and prefer individuals of the opposite sex.Moreover, male preference to female increased during their moulting status as they matured.Males were particularly more attracted by females with appearing white calcium plates, which corresponds to the beginning of their higher receptivity period.

View Article: PubMed Central - PubMed

Affiliation: Université de Poitiers, Laboratoire Ecologie et Biologie des Interactions, UMR CNRS 7267, Equipe Ecologie Evolution Symbiose, Poitiers, France. Freddie.jeanne.richard@univ-poitiers.fr

ABSTRACT
Mate choice is mediated by many components with the criteria varying across the animal kingdom. Chemical cues used for mate attractiveness can also reflect mate quality. Regarding the gregarious species Armadillidium vulgare (isopod crustacean), we tested whether individuals can discriminate conspecifics at two different levels (between sex and physiological status) based on olfactory perception. Tested conspecifics were individuals of the same or opposite sex, with the females at different moult stages. We found that the attractiveness of individuals was mediated by short-distance chemical cues and tested individuals were able to discriminate and prefer individuals of the opposite sex. Moreover, male preference to female increased during their moulting status as they matured. Males were particularly more attracted by females with appearing white calcium plates, which corresponds to the beginning of their higher receptivity period. These differences in attractiveness due to sex and physiological status are likely to shape the composition of aggregates and facilitate mate finding and optimize the reproductive success for both males and females. Thus aggregation pheromones could be linked to sex pheromones in terrestrial isopods.

Show MeSH
Related in: MedlinePlus