Covariance of adult size and development time in the parasitoid waspAphidius ervi in relation to the size of its host,Acyrthosiphon pisum

Sequeira, Richard; Mackauer, M.

doi:10.1007/bf02285332

Cited by 109 publications

(79 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The body size of A. eadyi progeny increased with the host stage parasitised, generally supporting the studies by various authors (e.g., Liu 1985;Sequeira & Mackauer 1992). However, the quadratic relationship between host stages attacked and the size of the resulting progeny suggested that A. eadyi gain similar body size when attacking the fourth instar nymphs and adults.…”

Section: Discussionsupporting

confidence: 87%

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

Wang²,

Teulon

2005

New Zealand Journal of Agricultural Research

View full text Add to dashboard Cite

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

show abstract

Section: Discussionsupporting

confidence: 87%

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

Wang²,

Teulon

2005

New Zealand Journal of Agricultural Research

View full text Add to dashboard Cite

show abstract

“…Natal host has been shown to influence odour preference, handling time and sex allocation behaviour, and to modify adult parasitoid morphology (Morris & Fellowes 2002;Fellowes et al 2005). Adult size is a highly flexible trait in many parasitoids that is determined by host size (Sequeira & Mackauer 1992b;Harvey et al 1994). This allows generalist parasitoids to use a broad range of host species.…”

Section: Discussionmentioning

confidence: 99%

Covariance of phenotypically plastic traits induces an adaptive shift in host selection behaviour

2006

View full text Add to dashboard Cite

Flexibility in adult body size allows generalist parasitoids to use many host species at a cost of producing a range of adult sizes. Consequently, host selection behaviour must also maintain a level of flexibility as adult size is related to capture efficiency. In the present study, we investigated covariance of two plastic traits-size at pupation and host size selection behaviour-using Aphidius ervi reared on either Acyrthosiphon pisum or Aulacorthum solani, generating females of disparate sizes. Natal host was shown to change the ranking of perceived host quality with relation to host size. Parasitoids preferentially attacked hosts that corresponded to the size of the second instar of their natal host species. This resulted in optimal host selection behaviour when parasitoids were exposed to the same host species from which they emerged. Parasitoid size was positively correlated with host size preference, indicating that females use relative measurements when selecting suitable hosts. These coadapted gene complexes allow generalist parasitoids to effectively use multiple host species over several generations. However, the fixed nature of the behavioural response, within a parasitoid's lifetime, suggests that these traits may have evolved in a patchy host species environment.

show abstract

“…The develop ment in pupa thus can be long, because the emerging adults on the mixed diet are large, and may require a longer time for metamorphosis (cf. Sequeira & Mackauer, 1992).…”

Section: Discussionmentioning

confidence: 99%

Larval omnivory in Amara aenea (Coleoptera: Carabidae)

Hůrka¹,

Jaros̆ı́k²

2003

Eur. J. Entomol.

View full text Add to dashboard Cite

Abstract. The duration of development, survivorship and adult size were compared for the larvae of Amara aenea reared in the first generation on pure diets of seeds (Stellaria media, Capsella bursa-pastoris, Tussilago farfara, Plantago major, Urtica dioica, or Potentilla argentela), or a pure diet of yellow mealworms (Tenebrio molitor larvae), and on a mixed diet of seeds and mealworm larvae (T. molitor, S. media and C. bursa-pastoris). To ascertain any long-term effects of pure diets, the beetles were reared on the same pure diet for several generations, or on different pure diets in different generations. The hypothesis that the larvae are primary omnivorous was tested. The evidence that the larvae of A. aenea are primary omnivorous was obtained by revealing that the larvae reared on the mixed diet of insects and seeds survived better, and developed faster in larger adults than those reared on the pure diets of seeds or insects. When the beetles were reared on the same pure diet for several generations, survivorship, and in most cases also the duration of development, did not change. However, when the beetles were reared on a different pure diet each generation, survi vorship significantly decreased in successive generations.

show abstract

Covariance of adult size and development time in the parasitoid waspAphidius ervi in relation to the size of its host,Acyrthosiphon pisum

Cited by 109 publications

References 43 publications

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

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

Covariance of phenotypically plastic traits induces an adaptive shift in host selection behaviour

Larval omnivory in Amara aenea (Coleoptera: Carabidae)

Contact Info

Product

Resources

About