Offspring sex ratio response to host size in the parasitoid wasp Spalangia endius

Napoleon, M. E.; King, B. H.

doi:10.1007/s002650050626

Cited by 42 publications

(41 citation statements)

References 40 publications

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“…Significant positive correlation between host size and female and total progeny production has been noticed in N. thymus. The higher female and total progeny allocation to larger hosts by N. thymus fell in line with those of Seko and Nakasuji (2004), Hagver and Hofsvang (1986), Omwega and Overholt (1997), Wen et al (1995), Nepoleon and King (1999) and Opp and Luck (1986).…”

Section: Discussionsupporting

confidence: 61%

“…Parasitoid total progeny has been recorded to be higher when bigger hosts were parasitized by Parnara guttata Bremer et Grey (Seko and Nakasuji (Hagver and Hofsvang 1986), and C. flavipes (Omwega and Overholt 1997). Similarly, greater number of female progeny allocation to larger hosts and male progeny to smaller hosts has been reported in Pimpla cerealellae (Wen et al 1995), S. endius (Nepoleon and King 1999), and A. melinus and A. lignanensis (Opp and Luck 1986). Significant positive correlation between host size and female and total progeny production has been noticed in N. thymus.…”

Section: Discussionmentioning

confidence: 80%

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Reproductive performance of Nesolynx thymus (Hymenoptera: Eulophidae) as influenced by host (Musca domestica) size

Aruna

Manjunath

2009

BioControl

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An investigation was conducted to understand the influence of host size on the reproductive performance of Nesolynx thymus, an ecto-pupal parasitoid of the uzi fly, Exorista bombycis, inflicting 10-20% loss to silkworm crops in the southern silk producing states of India. Two day-old adults of N. thymus were allowed to parasitize pupae of M. domestica, categorized into big and small at a parasitoid-host ratio of 1:20. After parasitoid adult eclosion, data on parasitization rate, developmental duration, male, female and total adult recovery per pupa and per female, sex ratio, adult size and adult longevity were recorded. The performance of first generation adults as influenced by host size was also recorded by allowing the first generation adults to parasitize three day-old pupae of E. bombycis. The parameters female and total progeny production per female, sex ratio, longevity, body length and wing span of males, females, head width of male, and abdomen length of female increased significantly with host size. No impact of host size was observed on performance of first generation adults.

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Section: Discussionsupporting

confidence: 61%

Section: Discussionmentioning

confidence: 80%

Reproductive performance of Nesolynx thymus (Hymenoptera: Eulophidae) as influenced by host (Musca domestica) size

Aruna

Manjunath

2009

BioControl

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“…However, not all parasitoid species exhibit a host-size dependent sex allocation (Donaldson and Walter 1984). For instance, host size did not influence sex allocation in the parasitoid wasp Spalangia endius Walker (Hymenoptera: Pteromalidae) (Donaldson and Walter 1984;Napoleon and King 1999).…”

Section: Mean Generation Time (T) (Day)mentioning

confidence: 99%

Functional response and life history parameters of Apanteles taragamae, a larval parasitoid of Maruca vitrata

et al. 2010

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The legume pod borer Maruca vitrata Fabricius (Lepidoptera: Crambidae) is a serious pest of cowpea in West-Africa. The parasitoid Apanteles taragamae Viereck (Hymenoptera: Braconidae) that originates from Taiwan is a potential candidate for biological control of M. vitrata. We investigated under laboratory conditions the functional response of the parasitoid by offering each experienced female 10, 20, 30 and 40 larvae of M. vitrata. We studied the influence of different host larval ages on the development, longevity, sex ratio, lifetime fecundity and parasitization rate of the wasp. In a comparative study, we also investigated the life history of A. taragamae and M. vitrata at different temperatures in the range of 20-30°C. The parasitoid successfully parasitized two-and three-day-old host larvae (first and second instars). Younger larvae (one-day-old) were parasitized to a lesser extent, and only males developed in them. Older larvae were not parasitized, partly because of defensive host behaviour. The success of parasitization was positively correlated with the density of two-day-old M. vitrata larvae. Parasitoid developmental time and longevity decreased with increasing temperature. The intrinsic rate of population increase (r m ) exhibited an optimum curve with a maximum at 24-28°C. For the host M. vitrata, r m was maximal at temperatures of 26-30°C. The data are discussed in the context of the potential of A. taragamae for biological control of M. vitrata.

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“…Many studies suggest that host stage at the time of parasitism affects the reproductive fitness of resulting parasitoids, altering for example the developmental time (Sequeira & Mackauer 1993), progeny sex ratio (Godfray 1994;Napoleon & King 1999), body size (Liu 1985;Lampson et al 1996), and egg load (Liu 1985;Visser 1994;Mills & Kuhlmann 2000). Foraging parasitoids usually encounter hosts of different life stages and have opportunities to select the most suitable hosts to maximise their reproductive success.…”

Section: Introductionmentioning

confidence: 99%

Host stage preference and reproductive fitnessof Aphidius eadyi(Hymenoptera: Aphidiidae) onAcyrthosiphon pisum(Hemiptera: Aphididae)

Wang²,

Teulon

2005

New Zealand Journal of Agricultural Research

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Host stage preference by Aphidius eadyiStarý, González & Hall on pea aphid, Acyrthosiphon pisum (Harris), and its effects on the reproductive fitness of A. eadyi, were studied in the laboratory at 20 ± 1°C and RH 60-70% with a photoperiod of 16 h light: 8 h dark. Aphidius eadyi females accepted aphids of all stages but preferred fourth instar nymphs and adults for oviposition. Females developed increasingly faster with the increase of host stages, and males developed faster than females in all host stages. The sex ratio of resulting parasitoids was close to 1:1 from all host stages. The egg load and body size of A. eadyi progeny at emergence increased with increasing host stage at the time of parasitisation. The host stage had nonlinear relationships with the number of eggs laid and aphids parasitised by A. eadyi, and the body size of its resulting progeny. Both host stage and body size of resulting parasitoid progeny affected the egg load of newly emerged parasitoids but the latter had more effect. The fourth instar aphids appeared to be the most appropriate hosts for the mass-rearing programme because they gave the best fitness return for the parasitoids. The field release of parasitoids

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Offspring sex ratio response to host size in the parasitoid wasp Spalangia endius

Cited by 42 publications

References 40 publications

Reproductive performance of Nesolynx thymus (Hymenoptera: Eulophidae) as influenced by host (Musca domestica) size

Reproductive performance of Nesolynx thymus (Hymenoptera: Eulophidae) as influenced by host (Musca domestica) size

Functional response and life history parameters of Apanteles taragamae, a larval parasitoid of Maruca vitrata

Host stage preference and reproductive fitnessof Aphidius eadyi(Hymenoptera: Aphidiidae) onAcyrthosiphon pisum(Hemiptera: Aphididae)

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