Habitat and plant specificity of Trichogramma egg parasitoids—underlying mechanisms and implications

Romeis, Jörg; Babendreier, D.; Wäckers, Félix; Shanower, Thomas G.

doi:10.1016/j.baae.2004.10.004

Cited by 114 publications

(73 citation statements)

References 162 publications

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“…"being more prevalent in certain habitats or on specific plants" (Romeis et al 2005). Such a habitat/plant loyalty might be due to their limited moving abilities.…”

Section: Discussionmentioning

confidence: 99%

“…Evidence is accumulating that Trichogramma spp. show high habitat loyalty, thus resulting in development of preferences for specific hosts and specific plants in the respective habitat (see Romeis et al, 2005 and references therein).…”

Section: Introductionmentioning

confidence: 99%

“…Egg parasitoids of herbivorous insects are known to use a wide range of chemicals for host selection, i.e., cues emitted by plants with and without host eggs, cues released by host adults, specifically the egg-laying female, and infochemicals of host eggs (Romeis et al, 2005;Rutledge, 1996). Trichogramma egg parasitoids are considered efficient biological control agents and are used worldwide for control of lepidopteran pests in many crops (Smith, 1996;Wajnberg and Hassan, 1994).…”

Section: Introductionmentioning

confidence: 99%

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The Response Specificity of Trichogramma Egg Parasitoids towards Infochemicals during Host Location

et al. 2006

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“…"being more prevalent in certain habitats or on specific plants" (Romeis et al 2005). Such a habitat/plant loyalty might be due to their limited moving abilities.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Response Specificity of Trichogramma Egg Parasitoids towards Infochemicals during Host Location

et al. 2006

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“…Any increase in sperm production could only be expressed if the male has the capacity to disperse. For females, vagility infl uences their capacity to disperse in search of hosts (Bourchier & Smith 1996, Bennett & Hoffmann 1998, Romeis et al 2005. Factors such as wing size and shape infl uence the capacity of Trichogramma females to disperse and therefore affect directly their fi tness through their capacity to fi nd and parasitize hosts (Kölliker-Ott et al 2003).…”

mentioning

confidence: 99%

Phenotypic plasticity and fitness in egg parasitoids

Boivin¹

2010

Neotrop. entomol.

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-Several proxies can be used to estimate the fi tness of egg parasitoids: size, longevity, fecundity, mating ability and vagility. All these proxies are positively correlated with the lifetime fi tness gain of an individual. However, the phenotypic plasticity, which is the ability of a genotype to produce distinct phenotypes depending on environmental conditions, may alter the value of these proxies. Host related factors (host species and quality), competition and duration of development will infl uence the proxies expressed by a given phenotype. When the phenotype is modifi ed by the temperature at which an individual develops, the resulting phenotype will vary based on the life history strategy of the parasitoid. While in koinobiont species an increase in size is positively correlated with longevity and fecundity, the reverse occurs with idiobiont parasitoids. Using size as a proxy could thus be misleading depending on the factors that infl uence the size of the adult.KEY WORDS: Fitness, proxy, reproduction, longevity, phenotype Most optimality models are based on the assumption that organisms optimize some physiological or behavioral characteristics in order to maximize their lifetime fi tness (Stephens & Krebs 1986). Fitness, defi ned here as the success of an individual in passing on copies of its genes to future generations (Bolhuis & Giraldeau 2005), is therefore used as a measure of success and any change in the morphology, physiology or behavior of an animal that increases its lifetime fi tness is expected to be positively selected. This concept is central in behavioral ecology and both direct fi tness and inclusive fi tness are recognized. Direct fi tness refers to the fi tness gained by an individual through the production of its own offspring while inclusive fi tness refers to the sum of the direct fi tness plus the indirect fi tness gained by the reproduction of nondescendant relatives (Krebs & Davies 1997).Insect parasitoids are good organisms to test hypothesis in behavioral ecology as the expression of behaviors associated with host localization and parasitization are directly linked to a gain in fi tness. Indeed, fi nding and successfully parasitizing a host results in additional progeny and therefore in an increase in fi tness (Godfray 1994). Another research area where measures of fi tness are used for parasitoids is applied ecology and in particular biological control (Roitberg et al 2001). When comparing different species or genotypes within a species for their potential in biological control programs, measures of fi tness can be used to assess their capacity to multiply and control a targeted pest.However, measuring directly fi tness is a diffi cult and timeconsuming process. One would have to measure the relative performance of genotypes and quantify their representation in a population over several generations (Hoffman 1994). In general, proxies that give absolute values, such as size, longevity, fecundity etc., are used to approximate the fi tness of an individual. The different...

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“…Parasitism rates by Trichogramma species can vary depending on environmental conditions, such as temperature and humidity, and by host density (Bourchier & Smith 1996;Quayle et al 2003;Kalyebi et al 2005). Romeis et al (2005) reviewed additional factors that can alter parasitism rates by Trichogramma, including habitat type and host food plant species and structure. Further research is needed to determine how these factors influence the interaction between N. conspurcatalis and its Trichogramma sp.…”

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confidence: 99%

Biology and Reproductive Parameters of the Brown Lygodium Moth, <I>Neomusotima conspurcatalis</I> - A New Biological Control Agent of Old World Climbing Fern in Florida

Boughton

Pemberton

2012

env. entom.

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Habitat and plant specificity of Trichogramma egg parasitoids—underlying mechanisms and implications

Cited by 114 publications

References 162 publications

The Response Specificity of Trichogramma Egg Parasitoids towards Infochemicals during Host Location

The Response Specificity of Trichogramma Egg Parasitoids towards Infochemicals during Host Location

Phenotypic plasticity and fitness in egg parasitoids

Biology and Reproductive Parameters of the Brown Lygodium Moth, <I>Neomusotima conspurcatalis</I> - A New Biological Control Agent of Old World Climbing Fern in Florida

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