Insect migration in an arid continent. II. <i>Helicoverpa</i> spp. in eastern Australia

Gregg, Peter; Fitt, G. P.; Zalucki, Myron P.; Murray, D. A. H.

doi:10.1017/cbo9780511470875.009

Cited by 53 publications

(53 citation statements)

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“…Understanding the dynamics is also economically important, for A. gamma becomes a major pest of many African, Asian, and European crops during outbreak years (26). Just how representative A. gamma is of other migrant insects is a matter for future study, but given the similarities in the migration strategies of A. gamma to those of other insects in Europe (24,34), Asia (21), North America (3,5,19,20), and Australia (8,35), it is very likely that the results of the present study will be applicable to a wide range of migrants. We conjecture, therefore, that during a time when most sedentary Lepidoptera (36,37) and many migrant birds (38,39) have experienced dramatic declines, the shared traits of high fecundity (40), polyphagy (26), year-round breeding (26), reduced disease and parasite loads (41,42), and efficient strategies for the use of windborne transport (43) to exploit widely dispersed seasonal resources are the principal factors that have enabled the recent temperature-related range expansions and population increases observed in many species of migrant Lepidoptera (44).…”

Section: Resultsmentioning

confidence: 99%

Seasonal migration to high latitudes results in major reproductive benefits in an insect

Chapman

Bell

Burgin

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

139

137

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Little is known of the population dynamics of long-range insect migrants, and it has been suggested that the annual journeys of billions of nonhardy insects to exploit temperate zones during summer represent a sink from which future generations seldom return (the "Pied Piper" effect). We combine data from entomological radars and ground-based light traps to show that annual migrations are highly adaptive in the noctuid moth Autographa gamma (silver Y), a major agricultural pest. We estimate that 10-240 million immigrants reach the United Kingdom each spring, but that summer breeding results in a fourfold increase in the abundance of the subsequent generation of adults, all of which emigrate southward in the fall. Trajectory simulations show that 80% of emigrants will reach regions suitable for winter breeding in the Mediterranean Basin, for which our population dynamics model predicts a winter carrying capacity only 20% of that of northern Europe during the summer. We conclude not only that poleward insect migrations in spring result in major population increases, but also that the persistence of such species is dependent on summer breeding in high-latitude regions, which requires a fundamental change in our understanding of insect migration.windborne migration | source-sink dynamics

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Section: Resultsmentioning

confidence: 99%

Seasonal migration to high latitudes results in major reproductive benefits in an insect

Chapman

Bell

Burgin

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

139

137

View full text Add to dashboard Cite

show abstract

“…Monitoring of source populations can enhance early detection of migration into cropping areas and provide opportunities for preventative control of the pest (Gregg et al 1995). Knowledge of movement patterns can also assist efforts to minimise the spread of insecticide resistance (Roush and McKenzie 1987;Daly 1993).…”

Section: Introductionmentioning

confidence: 99%

Multiple Allelic Variation in a Sodium Channel Gene from Populations of Australian Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) Detected via Temperature Gradient Gel Electrophoresis

Stokes

McKechnie

Forrester

1997

Australian Journal of Entomology

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Helicoverpa armigera, the cotton bollworm, is a significant pest of Australian field and vegetable crops and has a widespread incidence of resistance to pyrethroid insecticides. Naturally occurring variation in the para sodium channel gene was assayed in H. armigera. The polymerase chain reaction (PCR) was used to amplify part of the gene and temperature gradient gel electrophoresis (TGGE) used to detect differences in the melting properties of the amplified DNA fragments. A gene fragment of approximately 890 bp was characterised in a total of 66 individuals, comprising four sample groups: untreated controls and fenvalerate-treated individuals from both the Namoi valley, NSW and the St. George irrigation area, Qld. At least sixteen alleles were detected for the 3 '-end, 250 bp, HpaII digest fragment of the amplified part of the gene. The Namoi and St. George allele distributions were significantly heterogeneous, making this locus a suitable marker for use, with others, in migratory studies among H. armigera populations. Since this gene is a candidate for pyrethroid resistance in the related American pest Heliolhis virescens (F.) we looked for a difference in allele distributions between insecticide treated and untreated groups. No association between molecular variation in this gene and fenvalerate resistance was detected.

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“…In contrast, H. punctigera rarely overwinter in cropping areas and instead are reintroduced annually by migrants from inland Australia. Consequently, it is presumed that insects in cropping regions that carry enhanced levels of resistance genes selected during the previous summer are swamped by the susceptible insects emigrating from the unsprayed refugia (Gregg et al, 1995).…”

Section: The Risk Of Bt Resistance In Australiamentioning

confidence: 99%

Evolution, ecology and management of resistance in Helicoverpa spp. to Bt cotton in Australia

Downes

Mahon

2012

Journal of Invertebrate Pathology

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Insect migration in an arid continent. II. Helicoverpa spp. in eastern Australia

Cited by 53 publications

References 0 publications

Seasonal migration to high latitudes results in major reproductive benefits in an insect

Seasonal migration to high latitudes results in major reproductive benefits in an insect

Multiple Allelic Variation in a Sodium Channel Gene from Populations of Australian Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) Detected via Temperature Gradient Gel Electrophoresis

Evolution, ecology and management of resistance in Helicoverpa spp. to Bt cotton in Australia

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