Effects of Host Species and Size on Brood Size and Larval Mortality of the Parasitoid,<i>Ageniaspis fuscicollis</i>(Dalman) (Hymenoptera, Encyrtidae)

Ginkel, Wil van

doi:10.1603/0046-225x-33.3.528

Cited by 7 publications

(5 citation statements)

References 16 publications

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“…The host-quality model (Charnov et al, 1981) predicts that, if the response of sons and daughters to host quality differs, females should allocate to low-quality hosts the sex that suffers less. The fitness of females is generally more affected by host quality and therefore males are allocated to lowquality hosts as has been observed in several species (King, 1987;Cleary & van Ginkel, 2004) although exceptions have been reported (King, 1989;West & Sheldon, 2002). An important prediction of the host-quality model is that sex allocation in relation to host quality is not absolute but rather relative (West, 2009).…”

Section: Optimality Models In Biological Control 7 Optimal Sex Ratiomentioning

confidence: 86%

Using optimality models to improve the efficacy of parasitoids in biological control programmes

Wajnberg

Roitberg

Boivin

2015

Entomologia Exp Applicata

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Biological control of insect pests relies on the ability of natural enemies to limit pest populations. The behaviours expressed by natural enemies against their prey or hosts are modulated by a number of factors and a better understanding of these factors is key to obtaining more efficacious pest control. We propose here that optimality models based upon a behavioural ecology approach can provide a framework that should enable optimisation of biological control practices. We limit our discussion to parasitoid natural enemies and review the factors known to influence the behaviour of these insects. The most important areas that have been studied extensively in the behavioural ecology of insect parasitoids are addressed here: (1) residence time in a host patch, (2) clutch size, (3) sex ratio, (4) host and patch marking, and (5) diet choice. We discuss the implications of the incorporation of these optimality models into efficacious biological control practices and suggest areas where a better knowledge of the behavioural ecology of these insects could improve the efficacy of parasitoid-based pest control.

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Section: Optimality Models In Biological Control 7 Optimal Sex Ratiomentioning

confidence: 86%

Using optimality models to improve the efficacy of parasitoids in biological control programmes

Wajnberg

Roitberg

Boivin

2015

Entomologia Exp Applicata

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Section: Discussionmentioning

confidence: 99%

“…In gregarious parasitoids are known to increase brood size but decrease body size with an increase in host size (Dijkstra 1986;le Masurier 1987;Hardy, Griffiths & Godfray 1992). For the polyembryonic parasitoid Ageniaspis fuscicollis increases brood size with host size although the change in wasp body size is unknown (Cleary & van Ginkel 2004). Increases in both body mass and brood size with the increase in resources have often been found (but see Guisande et al 1996), suggesting major contributions from both traits to fitness (Sinervo 1999;Kolm et al 2006).…”

Section: S H I F T S I N T R a D E -O F F C U R V E S A N D A L L O Cmentioning

confidence: 99%

“…Capabilities of the polyembryonic wasp embryo to respond to the host environment, such as adjustment of embryonic divisions with host developmental stage and host size (Cleary & van Ginkel 2004;Corley, White & Strand 2005) and attacking other parasitoids present in the same host and achieving desired sex ratio (Giron et al 2004), have been reported. Plastic responses in accord with environmental variation are often crucial for species living in unpredictable environments (Fischer, Taborsky & Kokko 2011).…”

Section: E C H a N I S M S O F B R O O D -S I Z E A D J U S T M E N Tmentioning

confidence: 99%

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The size‐number trade‐off in clonal broods of a parasitic wasp: responses to the amount and timing of resource availability

Saeki

Crowley

2012

Functional Ecology

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Summary1. Life-history traits that shift in response to environmental conditions are well studied; however, allocation patterns of traits in the context of a trade-off shifting with the environment are hardly examined. 2. Using a polyembryonic parasitoid wasp system, we revealed features of the plasticity in allocation by observing the trade-off outcome between individual body mass and the number of offspring in a wasp brood in response to different host conditions. 3. We manipulated food availability to the host caterpillar at two different phases of development: early host instars during wasp embryo division and late host instars after completion of wasp embryo division. The food manipulation allowed us to shift the rate of development and the total mass of the wasp brood both separately and together through altered host development time and final size. 4. With greater host mass, the trade-off relationship between wasp body mass and brood size shifted, to the same extent for both sexes, towards higher wasp brood size and individual body mass. On the other hand, with faster host development, the trait combinations shifted towards greater wasp body mass but smaller brood size along the same trade-off relationship. 5. These shifts indicate a reduction of wasp brood size when resource level is reduced late in host development. This adjustment yields wasp brood size and body mass in rough proportion to each other and positively related to resource availability late in development. 6. Our demonstration of simultaneous shifts in traits under the trade-off relationship indicates that wasp broods respond differently to the different environmental conditions by altering body mass and the number of wasp individuals, suggesting that the plastic response in the trade-off allocation pattern may be adaptive.

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“…A major factor important to animal population dynamics is larval food supply. Due to changes in food resources between season and habitat, adult sex ratio, body size or mortality, as some crucial aspects of a predator's population dynamic, might also vary (King 1996;Strohm and Linsenmair 1997;Cleary and van Ginkel 2004;Boggs and Freeman 2005). Predators are strongly affected by fluctuations in prey density (Forsman and Lindell 1997;Salamolard et al 2000;Norrdahl and Korpimaki 2002).…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal density patterns of the pest predator Rhynchium haemorrhoidale (F.) along a land-use gradient in cacao agroforestry systems

et al. 2008

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Tropical insect species show year-round breeding activity due to favourable climatic conditions. However, most species also display seasonal reproductive peaks, but little is known about underlying causes of temporal density changes. We investigated population dynamics of the pest predator Rhynchium haemorrhoidale (F.) (Hymenoptera: Eumenidae) and its natural enemies in relation to season, climate and varying shade tree composition in cacao agroforestry systems in Central Sulawesi (Indonesia). Nesting of R. haemorrhoidale showed clear seasonality with highest densities in the wet season and lowest in the dry season, which was not related to changes in temperature. Wasp densities increased with land-use intensity, presumably because less-shaded areas offer more favourable climatic conditions and higher densities of the major prey, the cacao pest Agathodes caliginosalis (Lepidoptera: Pyralidae). Pupal body size was higher in June than in November indicating increasing intraspecific competition due to high wasp densities and food shortage at the beginning of the wet season. Body size between habitat types was similar, thus season appeared to be more important than habitat in terms of food supply. High wasp densities in the wet season were associated with high diversity of the altogether seven parasitoid species. In conclusion, we found a pronounced seasonality of the wasp R. haemorrhoidale and a preference for little shaded agroforestry, which may be due to enhanced temperature and density of its prey. Our data indicate a high potential for biological control of a major cacao pest by management of nesting sites of R. haemorrhoidale.

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Effects of Host Species and Size on Brood Size and Larval Mortality of the Parasitoid,Ageniaspis fuscicollis(Dalman) (Hymenoptera, Encyrtidae)

Cited by 7 publications

References 16 publications

Using optimality models to improve the efficacy of parasitoids in biological control programmes

Using optimality models to improve the efficacy of parasitoids in biological control programmes

The size‐number trade‐off in clonal broods of a parasitic wasp: responses to the amount and timing of resource availability

Spatiotemporal density patterns of the pest predator Rhynchium haemorrhoidale (F.) along a land-use gradient in cacao agroforestry systems

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