Host selection by virgin and inseminated females of the parasitic wasp, <i>Dinarmus basalis</i> (Pteromalidae, Hymenoptera)

Nishimura, Kinya

doi:10.1046/j.1365-2435.1997.00092.x

Cited by 9 publications

(6 citation statements)

References 31 publications

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“…There are recent reports that foraging strategies of unmated females are different from those of mated females in several parasitoid species (Antolin, 1989; Michaud, 1994; Michaud & Mackauer, 1995; Guertin et al ., 1996; Nishimura, 1997; King et al ., 2000; Mayhew & Heitmans, 2000; King, 2002). Female fitness is considered to be more sensitive to body size than male fitness, so mated females of E. fairchildii may commit infanticide more often.…”

Section: Discussionmentioning

confidence: 99%

Adaptive significance of facultative infanticide in the semi‐solitary parasitoid Echthrodelphax fairchildii

Yamada

Ikawa

2003

Ecological Entomology

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Abstract. 1. This is the first work to show how imperfect kin recognition influences the behavioural strategy of parasitoids. 2. The female of Echthrodelphax fairchildii lays an egg on the right or left side of the host thorax. When superparasitising on the side without the first offspring, it often probed the opposite side with its sting and killed the first offspring more than 50% of the time. The frequency of probing increased with increasing inter‐oviposition interval, and was higher in conspecific superparasitism than in self superparasitism. 3. The adaptiveness of probing was assessed by the difference in fitness returns between superparasitism with probing and superparasitism without probing. Fitness returns from self‐superparasitism and those from conspecific superparasitism were assessed by the fitness performance of both first and second comers, and that of second comers respectively. 4. In terms of the survival rate of immatures (one fitness component), probing under conspecific superparasitism guaranteed higher fitness returns than not probing for longer oviposition intervals, but under self‐superparasitism not probing guaranteed higher fitness returns for shorter intervals because superparasitism for such intervals often resulted in two‐adult emergence. 5. In terms of head width (another fitness component), probing produced higher fitness returns for shorter oviposition intervals for both self and conspecific superparasitism. 6. Assuming that offspring quantity contributes more to fitness returns than does offspring quality, the observed frequencies of probing were considered adaptive for parasitoids whose abilities to distinguish between self and conspecifically parasitised hosts and to estimate inter‐oviposition intervals are imperfect.

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Section: Discussionmentioning

confidence: 99%

Adaptive significance of facultative infanticide in the semi‐solitary parasitoid Echthrodelphax fairchildii

Yamada

Ikawa

2003

Ecological Entomology

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“…Seeds of all 26 wild bean populations and two commercial Mexican bean cultivars (“Pinto”, “San Lanzano”) were used for performance experiments with A. obtectus and the ectoparasitoid Dinarmus basalis , a solitary idiobiont ectoparasitoid on larvae and pupae of several species of grain and bean weevils [44]. Females of D. basalis are synovigenic, i.e.…”

Section: Methodsmentioning

confidence: 99%

Bottom-Up and Top-Down Effects Influence Bruchid Beetle Individual Performance but Not Population Densities in the Field

2013

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Plant quality (bottom-up) and natural enemies (top-down) can influence the individual performance of herbivorous insects on their host plants, but few studies measured at the same time the influence on population densities in the field. We investigated if plant quality of different wild common bean populations, Phaseolus vulgaris L. (Fabaceae), affects the performance of the bean weevil, Acanthoscelides obtectus (Say) (Coleoptera: Bruchidae), and one of its enemies, the ectoparasitoid Dinarmus basalis (Rondani) (Hymenoptera: Pteromalidae), in controlled laboratory experiments. Additionally, we examined if parasitoids influence the beetles' development and if increased individual beetle and parasitoid fitness lead to higher field population densities. We show that bean quality and parasitoids affected individual bean weevil performance under laboratory and field conditions. In the presence of parasitoids, fewer and smaller beetles emerged. However, beetle and parasitoid performance were not correlated. Increased individual performance was not leading to higher population densities; we found no correlations between measured performance components and beetle field infestation levels or parasitism rates. We conclude that bottom-up or top-down effects measured at the individual level do not always translate into population effects; therefore it is important to discriminate between effects acting on individual insects and those acting on populations.

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“…When many Callosobruchus chinensis bruchids occur within an azuki bean, the bean is moistened and its tegument becomes softened. Virgin Dinarmus basalis females reduce the costs of oviposition, thereby expanding their lifespan, by laying eggs in these aggregated hosts (Nishimura, 1997). In the present system, where there are no physical barriers to oviposition, host-related differences in handling time could come about Fig.…”

Section: Discussionmentioning

confidence: 84%

“…In these cases, it has been suggested that female parasitoids may not select hosts based on size alone but may use other qualitative criteria, which remain largely unknown. Virgin Dinarmus basalis females reduce the costs of oviposition, thereby expanding their lifespan, by laying eggs in these aggregated hosts (Nishimura, 1997). The high rejection levels of apparently suitable hosts has been observed previously in this (de Jong & van Alphen, 1989;Rivero-Lynch, 1994) and another related (Nell & van Lenteren, 1982;Cade Âe & van Alphen, 1997) koinobiont species and has raised the prospect that host selection behaviour may be based on female assessment of future potential of hosts as a resource for their offspring rather than on current host quality.…”

Section: Discussionmentioning

confidence: 99%

The relationship between host selection behaviour and offspring fitness in a koinobiont parasitoid

Rivero¹

2000

Ecological Entomology

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1. When host quality varies, optimal foraging theory assumes that parasitic wasps select hosts in a manner that increases their individual ®tness. In koinobiont parasitoids, where the hosts continue developing for a certain period of time after parasitisation, host selection may not re¯ect current host quality but may be based on an assessment of future growth rates and resources available for the developing larvae.2. When presented with hosts of uniform quality, the koinobiont parasitoid Leptomastix dactylopii exhibits a characteristic host-selection behaviour: some hosts are accepted for oviposition on ®rst encounter, while others are rejected several times before an egg is laid in them, a behaviour that is commonly associated with a changing host acceptance threshold during the course of a foraging bout.3. The ®tness of the offspring that emerged from hosts accepted immediately upon encounter was compared with the ®tness of offspring emerged from hosts rejected several times before being accepted for oviposition.4. The pattern of host acceptance and rejection was not related to any of the measured ®tness parameters of the offspring emerging from these hosts (development time, size at emergence, sex ratio at emergence, and female offspring egg load).5. While complex post facto adaptive explanations can be devised to explain the nature of such a time and energy consuming host selection process, it is suggested that physiological constraints on egg production or oviposition may provide an alternative, purely mechanistic, explanation for the results obtained.

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Host selection by virgin and inseminated females of the parasitic wasp, Dinarmus basalis (Pteromalidae, Hymenoptera)

Cited by 9 publications

References 31 publications

Adaptive significance of facultative infanticide in the semi‐solitary parasitoid Echthrodelphax fairchildii

Adaptive significance of facultative infanticide in the semi‐solitary parasitoid Echthrodelphax fairchildii

Bottom-Up and Top-Down Effects Influence Bruchid Beetle Individual Performance but Not Population Densities in the Field

The relationship between host selection behaviour and offspring fitness in a koinobiont parasitoid

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