Dispersal and effects of barriers on the movement of the New Zealand hover fly <i>Melanostoma fasciatum</i> (Dipt., Syrphidae) on cultivated land

Löveï, Gábor L.; MacLeod, Alan; Hickman, Janice M.

doi:10.1111/j.1439-0418.1998.tb01471.x

Cited by 27 publications

(16 citation statements)

References 22 publications

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“…Other groups of natural enemies, such as hoverflies, show greater dispersal activity (Lövei et al. ) and can be linked to increased biocontrol (Hickman and Wratten ).…”

Section: Discussionmentioning

confidence: 99%

Manipulating field margins to increase predation intensity in fields of winter wheat (Triticum aestivum)

Mansion‐Vaquié

Ferrante

Cook

et al. 2017

J Applied Entomology

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The effectiveness of natural enemies to control pests can be enhanced through habitat manipulation. However, due to the differences in their ecology, generalist and specialist species may respond differently to the same manipulation. Moreover, interactions among natural enemies (i.e. cannibalism, intraguild predation, hyperparasitism) may complicate the assumption that a higher density of natural enemies would increase the level of biological control. We investigated the natural enemy guild composition and the predation rate along flower vs. grass margins at the edge of winter wheat (Triticum aestivum) fields in Denmark. Natural enemies were sampled by pitfall trapping and by suction sampling; predation intensity was measured using two different sentinel prey methods: artificial caterpillars made of plasticine, and sentinel aphid colonies. Specialist and generalist species responded differently to the two margin types: specialists (mostly parasitic wasps) were attracted by the flower margins, while generalists (ground beetles, rove beetles and spiders) were more active in grass margins. The number of artificial caterpillars attacked was significantly greater in grass margins (mean = 48.9%, SD = 24.3) than in flower margins (mean = 30.7%, SD = 17.4). We found a significant positive relationship between the number of artificial caterpillars attacked by chewing insects, and activity density for large (≥15 mm) ground beetles. Predation of sentinel aphids in wheat fields did not vary significantly in relation to margin type. Our results suggest that flowering margins may be beneficial for canopy‐active specialist natural enemies, but grassy margins are more useful for ground‐active generalist predators.

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“…Other groups of natural enemies, such as hoverflies, show greater dispersal activity (Lövei et al. ) and can be linked to increased biocontrol (Hickman and Wratten ).…”

Section: Discussionmentioning

confidence: 99%

Manipulating field margins to increase predation intensity in fields of winter wheat (Triticum aestivum)

Mansion‐Vaquié

Ferrante

Cook

et al. 2017

J Applied Entomology

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“…Kwak et al. 1998; Lovei et al. 1998; Schulke & Waser 2001; Gathmann & Tscharntke 2002; Chapman et al.…”

Section: Discussionmentioning

confidence: 99%

Pollen dispersal and genetic variation in an early-successional forest herb in a peri-urban forest

Rossum

2009

Plant Biology

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In order to conserve forest plant species under the particularly high constraints that represent urban surroundings, it is necessary to identify the key factors for population persistence. This study examined within- and between-population pollen dispersal using fluorescent dye as pollen analogue, and genetic variation and structure using 15 allozyme loci in Centaurium erythraea, an insect-pollinated, early-successional forest biennial herb occurring in a peri-urban forest (Brussels urban zone, Belgium). Dye dispersal showed an exponential decay distribution, with most dye transfers occurring at short distances (<15 m), and only a few long-distance events (up to 743 m). Flowers of C. erythraea are mainly visited by Syrphids (Diptera) and small bees, which are usually considered as short-distance pollen dispersers, and occasionally by bumblebees, which are usually longer-distance pollen dispersers. Small and large dye source populations differed in dye deposition patterns. The populations showed low genetic diversity, high inbreeding coefficients (F(IS)) and high genetic differentiation (F(ST)), suggesting restricted gene flow, which can be expected for an early-successional biennial species with a predominantly selfing breeding system and fluctuating population sizes. The positive relationship between recruitment rate and allelic richness and expected heterozygosity, and the absence of significant correlations between genetic variation and population size suggest seedling recruitment from the seed bank, contributing to maintain genetic diversity. Long-distance dye dispersal events indicate pollinator movements along urban forest path and road verges. These landscape elements might therefore have a potential conservation value by contributing to connectivity of early-successional species populations located in patchy open habitats.

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“…These were calculated for circular areas with a radius of 50 m around hoverfly sample points and comprised the amount of woody and herbaceous elements (percentage cover) and local habitat diversity (number of EUNIS habitat types). A radius of 50 m seems appropriate because most European hoverfly species are considered as non‐migrants (Gatter and Schmid 1990, Speight 2003) which rarely disperse more than 50 m (Lövei et al 1998, Wratten et al 2003).…”

Section: Methodsmentioning

confidence: 99%

Functional richness of local hoverfly communities (Diptera, Syrphidae) in response to land use across temperate Europe

Schweiger

Musche²,

Bailey³

et al. 2006

Oikos

116

105

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Environmental change is not likely to act on biodiversity in a random manner, but rather according to species traits that affect assembly processes, thus, having potentially serious consequences on ecological functions. We investigated the effects of anthropogenic land use on functional richness of local hoverfly communities of 24 agricultural landscapes across temperate Europe. A multivariate ordination separated seven functional groups based on resource use, niche characteristics and response type. Intensive land use reduced functional richness, but each functional group responded in a unique way. Species richness of generalist groups was nearly unaffected. Local habitat quality mainly affected specialist groups, while land use affected intermediate groups of rather common species. We infer that high species richness within functional groups alone is no guarantee for maintaining functional richness. Thus, it is not species richness per se that improves insurance of functional diversity against environmental pressures but the degree of dissimilarity within each functional group

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Dispersal and effects of barriers on the movement of the New Zealand hover fly Melanostoma fasciatum (Dipt., Syrphidae) on cultivated land

Cited by 27 publications

References 22 publications

Manipulating field margins to increase predation intensity in fields of winter wheat (Triticum aestivum)

Manipulating field margins to increase predation intensity in fields of winter wheat (Triticum aestivum)

Pollen dispersal and genetic variation in an early-successional forest herb in a peri-urban forest

Functional richness of local hoverfly communities (Diptera, Syrphidae) in response to land use across temperate Europe

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