Seed-infesting chalcids of the genus Megastigmus Dalman, 1820 (Hymenoptera: Torymidae) native and introduced to the West Palearctic region: taxonomy, host specificity and distribution

Roques, Alain; Skrzypczyńska, M.

doi:10.1080/713834669

Cited by 104 publications

(125 citation statements)

References 52 publications

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“…In particular it is shown that the biological characteristics of M. schimitscheki in both native and invaded area are rather similar to these of other Megastigmus seed chalcids which have been extensively studied in Europe, North America and Japan (e.g. Kamijo, 1962;Hedlin et al, 1980;Roques, 1983;Roques and Skrzypczynska, 2003). Because of this recent introduction, M. schimitscheki did not recruit any predators in France yet.…”

Section: Introductionmentioning

confidence: 68%

“…Several biological traits facilitate the establishment of Megastigmus seed chalcids in exotic countries: (i) an ability to extend larval diapause in seeds for up to 5 years in most species, allowing them to bridge periods where seeds are unavailable because of masting phenomenon (Turgeon et al, 1994); (ii) parthenogenesis (the females can reproduce without males Roques, 1983;Roques and Skrzypczynska, 2003). A simplified life cycle of M. schimitscheki is given in Fig.…”

Section: Insect Behaviour and Simplifying Hypothesesmentioning

confidence: 99%

“…This is especially true for the insects infesting tree seeds, whose cryptic way of life does not usually allow a detection easier than using Xrays, the more as phytosanitary regulations are limited or non existent in many countries. In the West Palearctic, 8 of the 21 species recorded in the seed chalcid genus Megastigmus Dalman (Hymenoptera: Torymidae) are exotic invasive 1 species introduced through seed trade (Roques and Skrzypczynska, 2003). Modelling the expansion processes of such invasive species, and the related damages to forests and tree plantations, becomes a priority.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the insect is facing little competition for the exploitation of seed resources because the new host, Cedrus atlantica, is also introduced (but from North Africa) and its cones and seeds are still not colonized by the indigenous entomofauna. There is only one competitor, Megastigmus pinsapinis Hoffmeyer, another Megastigmus seed chalcid which has been introduced half a century ago from North Africa (Roques and Skrzypczynska, 2003). However, M. pinsapinis seems dominated by M. schimitscheki (Fabre et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Modelling the impact of an invasive insect via reaction-diffusion

Roques

Auger‐Rozenberg²,

Roques³

2008

Mathematical Biosciences

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An exotic, specialist seed chalcid, Megastigmus schimitscheki, has been introduced along with its cedar host seeds from Turkey to southeastern France during the early 1990s. It is now expanding in plantations of Atlas Cedar (Cedrus atlantica). We propose a two-dimensional reactiondiffusion model to predict the expansion and impacts of this insect. Two main diffusion operators, of Fokker-Planck and Fickian types, are tested. We show that taking account of the dependence of the insects mobility with respect to spatial heterogeneity, and choosing the appropriate diffusion operator, are critical factors for obtaining good predictions.

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Section: Introductionmentioning

confidence: 68%

Section: Insect Behaviour and Simplifying Hypothesesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modelling the impact of an invasive insect via reaction-diffusion

Roques

Auger‐Rozenberg²,

Roques³

2008

Mathematical Biosciences

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“…A group of insects that lends itself to such study is Megastigmus, a genus of seed chalcids that has many species-specific interactions with conifers throughout a wide range of families (Roques and Skrzypczynska, 2003). Hussey (1955) speculated that females of Megastigmus spermotrophus Wachtl are able to distinguish fertilized ovules from unpollinated ones in Douglas-fir, but there is evidence that seed chalcids oviposit before plant fertilization takes place, and that larvae were even present in megagametophtyes that developed from unfertilized ovules (Niwa and Overhulser, 1992;Rappaport et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

Multinucleate storage cells in Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) and the effect of seed parasitism by the chalcid Megastigmus spermotrophus Wachtl

Aderkas

Rouault²,

Wagner

et al. 2005

Heredity

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Megagametophytes of Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) accumulated storage products following fertilization. As megagametophytes matured, the number of nuclei per cell rose, resulting in syncytial storage cells. Studies carried out on trees in France and Canada confirmed that such previously unreported, free nuclear cells were a normal part of late megagametophyte development. Unfertilized megagametophytes showed that some binucleate cells before degeneration resulted in empty seed. Insect parasitism prevented megagametophyte abortion in unfertilized ovules. Oviposition by a torymid chalcid wasp (Megastigmus spermotrophus Wachtl) early in megagametophyte development resulted in normal megagametophyte development. Around the time of plant egg maturation, binucleate and trinucleate cells were observed. As megagametophytes matured, multinucleate mature storage cells rich in proteins, lipids and starch were formed. The insect was able to induce identical nuclear behaviour in infested, unfertilized megagametophytes, as that of uninfested, fertilized megagametophytes. Heredity (2005) 94, 616-622.

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Ecological Biochemistry

Hee

2012

Encyclopedia of Life Sciences

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Ecological biochemistry is the study of the role of biochemistry and chemistry in the ecological relationships of different organisms in their abiotic environment. In the middle of the nineteenth century, it was found that insect herbivores could be repelled by chemicals emitted by, or eaten in, a target plant. Development of toxicology, biochemistry, ecology as disciplines and of analytical chemistry techniques allowed the molecular basis to be determined in 1968 when cardiac glycosides (cardenolides) of milkweed were shown to cause young blue jays to vomit up partially eaten Monarch butterflies and to avoid butterflies. Numerous chemical signalling systems were soon found for many host–predator and/or host–benefactor interactions of many species. The advent of genomic techniques in the twenty‐first century has allowed the genetic basis of these interactions to be examined in recent research, a trend that will also apply for future research. Key Concepts: Ecological biochemistry focuses on the identification and quantification of molecules that interact with a different organism and the mechanism of the interaction. Ecological biochemistry also features the fate and transport aspects of molecules that interact with a different organism. Ecological biochemistry also features how the interacting molecule is produced and that mechanism.

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Seed-infesting chalcids of the genus Megastigmus Dalman, 1820 (Hymenoptera: Torymidae) native and introduced to the West Palearctic region: taxonomy, host specificity and distribution

Cited by 104 publications

References 52 publications

Modelling the impact of an invasive insect via reaction-diffusion

Modelling the impact of an invasive insect via reaction-diffusion

Multinucleate storage cells in Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) and the effect of seed parasitism by the chalcid Megastigmus spermotrophus Wachtl

Ecological Biochemistry

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