Regulation of pheromone inhibition in mated females of Choristoneura fumiferana and C. rosaceana

Delisle, Johanne; Picimbon, Jean-François; Simard, J M

doi:10.1016/s0022-1910(99)00198-5

Cited by 40 publications

(26 citation statements)

References 31 publications

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“…This confirms that, the attractiveness of virgin females does not change much during the first few days of their lives (Delisle et al, 2000). Although most of the virgin females used in this study were reared in the laboratory on artificial diet, our comparisons of wild and laboratory-reared females indicate that there was no difference in their attractiveness to males in the field or in the concentration of the main component of their sex pheromone.…”

Section: Discussionsupporting

confidence: 81%

“…Whereas weather, trophic interactions, and dispersal have been the main considerations in these arguments, the role of mating success has not been discussed. Females can mate several times during their life, although mated females are less attractive than virgins (Outram, 1968;Delisle et al, 2000). Virgin females eclosing from pupae perch on tree branches and begin 'calling' at dusk within 24 h by extruding their pheromone gland and emitting pheromone (Sanders & Lucuik, 1972).…”

Section: Introductionmentioning

confidence: 99%

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Mate‐finding allee effect in spruce budworm population dynamics

Régnière

Delisle

Pureswaran

et al. 2012

Entomologia Exp Applicata

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Allee effects can cause populations to decline due to decreasing population growth rates with decreasing density and play a major role in population dynamics. Mate-finding failure, a common mechanism contributing to demographic Allee effects, is usually difficult to demonstrate because of the arduous nature of sampling individuals at very low densities. In a rising outbreak of the eastern spruce budworm, Choristoneura fumiferana (Clemens) (Lepidoptera: Tortricidae), we used caged and tethered virgin females in traps to measure mating success over population densities ranging from deep endemic to outbreak conditions. We found that mating success increased with increasing population density, and that at endemic population densities, females experienced difficulties attracting males and mating, demonstrating for the first time a mate-finding Allee effect in the spruce budworm. The relationship between population density and mating success is nonlinear. As population density increased, the proportion of mated females eventually reached a plateau and mating success was not 100% even at the highest moth densities, probably due to female reluctance to mate and perhaps interference competition by males for access to females. Both laboratory-reared and wild females were equally effective in synthesizing pheromone, attracting males, and mating. Our results strongly suggest that a mate-finding Allee effect is involved in maintaining low-density spruce budworm populations below an Allee threshold where they fail to grow. Factors such as changes in predation pressure and immigration could help populations overcome this Allee threshold.

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Mate‐finding allee effect in spruce budworm population dynamics

Régnière

Delisle

Pureswaran

et al. 2012

Entomologia Exp Applicata

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“…Similar to its allatotropic effect in D. melanogaster, DrmSP can also stimulate JH-II production by isolated corpora allata of H. armigera virgin females in vitro in a dose dependent manner (Fan et al, 1999). JH titers significantly increase in females of some moth species after mating and the involvement of JH in mating-induced pheromone suppression has been reported (Delisle et al, 2000;Ramaswamy et al, 1997). The JH analog, fenoxycarb, was shown to inhibit pheromone production by mature adult H. armigera females and to down-regulate the PBAN-receptor protein and gene transcript (Bober et al, 2009;Rafaeli and Bober, 2005).…”

Section: Introductionmentioning

confidence: 74%

Identification and differential expression of a sex-peptide receptor in Helicoverpa armigera

Hanin

Azrielli

Zakin

et al. 2011

Insect Biochemistry and Molecular Biology

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“…van Dijken et al (1993) also observed similar sex ratios in parasitized and superparasitized hosts in the parasitoid Epidinocarsis lopezi , suggesting that conspecific superparasitism does not contribute to sex ratio variability. van Dijken et al (1993) also observed similar sex ratios in parasitized and superparasitized hosts in the parasitoid Epidinocarsis lopezi , suggesting that conspecific superparasitism does not contribute to sex ratio variability.…”

Section: Discussionmentioning

confidence: 58%

Impact of mating status on egg‐laying and superparasitism behaviour in a parasitoid wasp

Darrouzet

Bignon

Chevrier

2007

Entomologia Exp Applicata

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Most parasitoid female wasps can distinguish between unparasitized and parasitized hosts and use this information to optimize their progeny and sex allocation. In this study, we explored the impact of mating on oviposition behaviour (parasitism and self-and conspecific superparasitism) on both unparasitized and already parasitized hosts in the solitary parasitoid wasp Eupelmus vuilleti (Crw.) (Hymenoptera: Eupelmidae). Virgin and mated females had the same oviposition behaviour and laid eggs preferentially on unparasitized hosts. The sex ratio (as the proportion of females) of eggs laid by mated females in parasitism and conspecific superparasitism was 0.67 ± 0.04 and 0.57 ± 0.09, respectively. Likewise, females laid more eggs in conspecific superparasitism than self-superparasitism under our experimental conditions. These experiments demonstrate that E. vuilleti females can (i) discriminate between unparasitized and parasitized hosts and adapt the number of eggs they lay accordingly, and (ii) probably discriminate self from conspecific superparasitized hosts. Finally, mating does not appear to influence the host discrimination capacity, the ovarian function, or the oviposition behaviour.

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Regulation of pheromone inhibition in mated females of Choristoneura fumiferana and C. rosaceana

Cited by 40 publications

References 31 publications

Mate‐finding allee effect in spruce budworm population dynamics

Mate‐finding allee effect in spruce budworm population dynamics

Identification and differential expression of a sex-peptide receptor in Helicoverpa armigera

Impact of mating status on egg‐laying and superparasitism behaviour in a parasitoid wasp

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