Take-off activity in caged desert locusts,Schistocerca gregaria (Forsk.) (Orthoptera, Acrididae) in relation to meteorological disturbances

Bergh, Jan-Erik

doi:10.1007/bf01044901

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…There do not seem to have been any field studies of take-off being stimulated by a windshift line during the short time that it takes to pass overhead, although Bergh (1988) found increased take-off frequency in the laboratory with passage of cold fronts.…”

Section: Ispersion and Concentration Of Flying Insectsmentioning

confidence: 91%

Concentration of flying insects by the wind

1990

Phil. Trans. R. Soc. Lond. B

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The role of horizontal wind convergence in concentrating flying insects is examined. Because of the inverse relation between intensity and persistence of convergence zones, a tenfold increase in volume density is unlikely to be exceeded in a single atmospheric disturbance, and then only if the insects are not taken through the convergence zone. Radar has shown that the commonest disturbances associated with insect concentrations are windshift lines: modifications of the broad-scale wind flow due to buoyancy and blocking effects. Even in the absence of concentration, a tenfold increase in area density can be brought about by vertical circulations at windshift lines. Insect concentrations are likely to be most frequent and persistent at night, and over and near mountains, where searches are most difficult.

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Section: Ispersion and Concentration Of Flying Insectsmentioning

confidence: 91%

Concentration of flying insects by the wind

1990

Phil. Trans. R. Soc. Lond. B

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“…This makes it difficult to ascribe a causal role to any one parameter. Studies such as the present one cannot address these questions, which await laboratory experiments on the influence of factors such as barometric pressure, temperature and rainfall on the initiation and termination of migratory flight such as those of Bergh (1988).…”

Section: Synoptic Patterns Wind Convergence and Trap Catchesmentioning

confidence: 88%

Migrating moths collected in tower-mounted light traps in northern New South Wales, Australia: influence of local and synoptic weather

Gregg¹,

Fitt²,

Coombs³

et al. 1994

Bull. Entomol. Res.

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Catches of moths in tower-mounted light traps in northern New South Wales were analysed in relation to local and synoptic weather. Catches were correlated with windspeed, relative humidity and possibly rainfall. No correlations were obtained with temperature or moon phase. Catches were more likely to occur when winds were from the east, and were associated with wind shifts. There was a significant association with the passage of depressions or troughs, but not cold fronts. The traps were considered to be poor indicators of migration associated with fronts, because these were accompanied by high winds in which trap efficiency was reduced. Stepwise multiple regressions using temperature, relative humidity, rainfall and windspeed accounted for only about 25% of the variance, much lower than in comparable studies with ground level light traps. These results are thought to indicate that the trap catches were reflecting long-distance migration, which was usually associated with disturbed weather. Back tracking with upper wind data was used to define probable sources of moths. In the spring and early summer, these sources were predominantly to the north and west of the traps, in semi-arid pastoral and subhumid cropping zones. In the late summer and autumn they were predominantly to the south and east, in the humid pastoral and forest zone. These results are discussed in relation to the migratory strategies of several important agricultural pest species.

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“…wasps are known to forage at temperatures greater than those reported in our study sites (Spradbery & Maywald, 1992); therefore, we used the mean temperature. Finally, we used the mean atmospheric pressure that is known to affect activity in several other insect species (Edwards, 1961;Ankney, 1984;Bergh, 1988;Anderson et al, 1993).…”

Section: Weather Datamentioning

confidence: 99%

Local dynamics of worker activity of the invasive Vespula germanica and V. vulgaris (Hymenoptera: Vespidae) wasps in Argentina

Masciocchi

Pereira

Corley

2015

Ecological Entomology

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1. The abundance of insects depends essentially on the reproductive success of individuals. In social insects, however, the abundance of sterile workers outside a nest depends on colony size but is also determined by ontogeny, nest demands, and local environmental factors. For invasive social wasps, the drivers of worker abundance are important because they determine the impact that these species have on the native systems, people, and their goods. 2. The aim of the present study was to understand the relative importance of endogenous and exogenous factors on the abundance of workers of populations of Vespula spp., by analysing 12 years of trap captures in NW Patagonia. This is the first attempt to model the activity levels of invasive Vespula spp. wasps over time in Argentina. 3. It was shown that between years, the worker activity of both vespids presents fluctuations, and that of V. germanica is determined by the spring mean temperatures. Within the flight season, V. germanica worker activity is affected by the relative abundance of workers in that year, whereas for V. vulgaris, activity it is affected by the relative abundance of both species that year. We found no relationship between individual weather variables and activity within a flight season for both wasps. 4. The patterns observed for Argentina are similar to those observed in all invaded temperate areas where Vespula spp. are established. This study provides useful information to understand the driving factors that affect Vespula spp. worker activity in Argentina. This could be a necessary step to develop plans to manage these invasive social insects.

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Take-off activity in caged desert locusts,Schistocerca gregaria (Forsk.) (Orthoptera, Acrididae) in relation to meteorological disturbances

Cited by 7 publications

References 22 publications

Concentration of flying insects by the wind

Concentration of flying insects by the wind

Migrating moths collected in tower-mounted light traps in northern New South Wales, Australia: influence of local and synoptic weather

Local dynamics of worker activity of the invasive Vespula germanica and V. vulgaris (Hymenoptera: Vespidae) wasps in Argentina

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