Lifetime egg maturation by host-deprived Venturia canescens

Roberts, Harry; Schmidt, Otto

doi:10.1016/j.jinsphys.2003.11.007

Cited by 32 publications

(35 citation statements)

References 15 publications

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“…Naturally, fed synovigenic females would have more opportunities to expand their egg load as they aged, up to a limit. In other words, food and maternal age might be intimately linked to egg production in some synovigenic species (see Harvey et al 2001;Roberts and Schmidt 2004). In this study, I tested the hypothesis that honey and maternal age have no influence on the egg load of young, lab-cultured C. marginiventris females.…”

Section: Introductionmentioning

confidence: 95%

Influence of honey and maternal age on egg load of lab-cultured Cotesia marginiventris

Riddick

2007

BioControl

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Laboratory experiments were conducted to determine the impact of feeding status and maternal age on egg load of Cotesia marginiventris (Cresson) (Hymenoptera: Braconidae), a solitary, koinobiont endoparasitoid of noctuid pests. Egg load was defined as the number of mature (i.e., fully-chorionated) eggs found in the ovaries and oviducts. Significantly more mature eggs were stored in honey-fed than starved females. For honey-fed females, egg load increased within several days of isolation from hosts. This study suggests that C. marginiventris is weakly synovigenic because females emerge with a considerable number of mature eggs and are capable of maturing many more eggs. Feeding on a suitable source of carbohydrate should increase the egg load (i.e., potential fecundity) of this insect within 3-4 days in an in vivo rearing system.

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Section: Introductionmentioning

confidence: 95%

Influence of honey and maternal age on egg load of lab-cultured Cotesia marginiventris

Riddick

2007

BioControl

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“…Total eggs matured by 7-dayold host-deprived wasps were determined as per Roberts and Schmidt (2004).…”

Section: Measurement Of Phenotypicmentioning

confidence: 99%

An empirical model of the sympatric coexistence of two strains of the endoparasitoid wasp Venturia canescens

Roberts

Keller

Schmidt

2006

Arch Insect Biochem Physiol

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Recent research has demonstrated that a laboratory culture of the asexual solitary endoparasitoid wasp Venturia canescens Grav. (Hymenoptera: Ichneumonidae) contains two genetically and phenotypically distinct lines, coexisting on their host the flour moth Ephestia kuehniella Zeller (Lepidoptera: Pyralidae). The basis to the coexistence of the two lines appears to be differences in their reproductive success under single parasitism and superparasitism. Furthermore, examination of field-derived wasps from several locations has shown that the phenotypes displayed by the laboratory colonies also co-occur in field populations. Historically, the impossibility of showing that two species do not occupy separate niches has precluded any demonstration of sympatric coexistence in the field. Here we present the results of an iterative model that uses a range of experimental life history data to predict the stable composition of a mixed population of two lines displaying the laboratory phenotypes under different rates of superparasitism. The model predicts that sympatric coexistence of the two lines is possible when the overall rate of superparasitism is between 4 and 12% or greater. These values are within the rates reported for other solitary endoparasitoid wasp species in the field, and so demonstrate that the sympatric coexistence under natural conditions of two species that display the phenotypes observed in the laboratory lines is, in principle, possible.

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“…For example, some insect females respond to host deprivation by retarding egg maturation (Sadehi & Gilbert, 2000) or postponing egg laying (Åsman & Ekborn, 2006). Moreover, in many taxa, females deposit eggs on substrates unsuitable for larval growth (Messina & Slade, 1999;Parsons & Credland, 2003;Roberts & Schmidt, 2004;Wang & Horng, 2004). This form of oviposition behaviour is termed "egg-dumping" (Engelmann, 1970;Wilson & Hill, 1989).…”

Section: Introductionmentioning

confidence: 99%

“…This form of oviposition behaviour is termed "egg-dumping" (Engelmann, 1970;Wilson & Hill, 1989). Because there is a trade-off between present reproduction and survival or future reproduction (Stearns, 1992), egg-dumping may be a maladaptive involuntary response of mated females that cannot prevent oocyte maturation when hosts are absent (the egg-load hypothesis; Wilson & Hill, 1989;Roberts & Schmidt, 2004). Alternatively, egg-dumping could be an adaptive response to a shortage of hosts if it increases a female's overall efficiency in maturing eggs and ovipositing (the egg-maturation hypothesis, Wang & Horng, 2004).…”

Section: Introductionmentioning

confidence: 99%

Egg-dumping behaviour in the seed beetle Acanthoscelides obtectus (Coleoptera: Chrysomelidae: Bruchinae) selected for early and late reproduction

Šešlija¹,

Stojković²,

Tucić³

et al. 2009

Eur. J. Entomol.

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Abstract. In the present study the egg dumping behaviour in short (E)-and long (L)-lived lines of the seed beetle Acanthoscelides obtectus was analyzed. Females of the short-lived E line exhibited substantially higher egg dumping than long-lived L line females. We hypothesize that, since cessation of egg dumping enhances longevity, non-dumping females were selectively favoured in the L regime. Our study also produced evidence that the selection regime affected the male's ability to influence female egg-dumping behaviour. The females mated to males from the lines that were selected for extended longevity and of which the females exhibited little egg-dumping dumped fewer eggs. We suggest that in the L selection regime, where offspring produced at the end of the females' reproductive period were recruited to the next generation, selection operated against those males that stimulated female oviposition in the absence of seeds. This is the first study to provide evidence that selection for long-lived insects results in the reduced potency of male seminal products to stimulate female oviposition.

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Lifetime egg maturation by host-deprived Venturia canescens

Cited by 32 publications

References 15 publications

Influence of honey and maternal age on egg load of lab-cultured Cotesia marginiventris

Influence of honey and maternal age on egg load of lab-cultured Cotesia marginiventris

An empirical model of the sympatric coexistence of two strains of the endoparasitoid wasp Venturia canescens

Egg-dumping behaviour in the seed beetle Acanthoscelides obtectus (Coleoptera: Chrysomelidae: Bruchinae) selected for early and late reproduction

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