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Hoverfly

 

Hoverfly

Syrphidae
Sixteen different species of hoverfly
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Diptera
Suborder: Brachycera
Section: Aschiza
Superfamily: Syrphoidea
Family: Syrphidae
Latreille, 1802
Subfamilies

Hoverflies, sometimes called flower flies, sweat bees or syrphid flies, make up the insect family Syrphidae. As their common name suggests, they are often seen hovering or nectaring at flowers; the adults of many species feed mainly on nectar and pollen, while the larvae (maggots) eat a wide range of foods. In some species, the larvae are saprotrophs, eating decaying plant and animal matter in the soil or in ponds and streams. In other species, the larvae are insectivores and prey on aphids, thrips, and other plant-sucking insects.

pests, and potential agents for use in biological control. Some adult syrphid flies are important pollinators.

About 6,000 species in 200 genera have been described. Hoverflies are common throughout the world and can be found on all continents except Antarctica. Hoverflies are harmless to most other animals, despite their mimicry of more dangerous wasps and bees, which wards off predators.

Contents

  • Description 1
  • Reproduction and lifecycle 2
  • Distribution and habitat 3
  • Pollination 4
    • Case study - New Zealand 4.1
  • Systematics 5
  • Relationship with people 6
  • Identification guides 7
  • Regional lists 8
  • See also 9
  • References 10
  • External links 11
    • Species lists 11.1

Description

Characteristic wing venation of the Syrphidae

The size of hoverflies varies depending on the species.[1] Some, like members of the genus

  • Nearctic
  • West Palaearctic including Russia
  • Australasian/Oceanian
  • World list

Species lists

  • Hoverfly - index to scholarly articles
  • [1] All About Hoverflies http://www.microscopy-uk.org.uk/mag/artmay07/cd-hoverflies.html
  • Syrphidae in Italian
  • A web-site about Dutch hoverflies
  • Hoverfly Recording Scheme - UK Dipterists Forum
  • Syrphidae species in Europe and Africa, with photos, range maps, checklists and literature
  • Family Syrphidae at EOL Image Gallery
  • Northwest Europe Hoverflies - archived at The Wayback Machine
  • Photographs of World Hoverflies from Japan, in English
  • Diptera.info Picture Gallery
  • "Allograpta obliqua"A hover fly, . Featured Creatures.  

External links

  1. ^ a b c d e f g "Hover fly".  
  2. ^ a b c d "Hoverfly". Hutchinson Encyclopedia. Helicon Publishing. 2009. Retrieved December 6, 2009. 
  3. ^ Reemer, Menno (2008). Thompson, 1969 (Diptera, Syrphidae)"Paragodon, a new genus of Microdontinae, with notes on Surimyia" ( 
  4. ^ a b Aguilera A, Cid A, Regueiro BJ, Prieto JM, Noya M (September 1999). "Eristalis tenax"Intestinal myiasis caused by .  
  5. ^ Dictionary of Ichthyology; Brian W. Coad and Don E. McAllister at ww.briancoad.com
  6. ^ Whish-Wilson PB (2000). "Eristalis tenax"A possible case of intestinal myiasis due to .  
  7. ^ Barkemeyer, Werner. "Syrphidae (hoverflies)". Biodiversity Explorer. South Africa:  
  8. ^ Thompson, F. Christian (August 19, 1999). "Flower Flies". The Diptera Site.  
  9. ^ Philip J. Scholl, E. Paul Catts & Gary R. Mullen (2009). "Myiasis (Muscoidea, Oestroidea)". In Gary Mullen, Gary Richard Mullen & Lance Durden. Medical and Veterinary Entomology (2nd ed.).  
  10. ^ Laura Smith. "Syrphidae, hover flies". bumblebee.org. 
  11. ^ a b Larson, B.M.H; Kevan, P.G.; Inouye, D. W. (2001). "Flies and flowers: taxonomic diversity of anthophiles and pollinators.". Canadian Entomologist 133: 439–465.  
  12. ^ Van Der Kooi, C. J.; Pen, I.; Staal, M.; Stavenga, D. G.; Elzenga, J. T. M. (2015). "Competition for pollinators and intra-communal spectral dissimilarity of flowers" (PDF). Plant Biology.  
  13. ^ Haslett, J.R. (1989). "Interpreting patterns of resource utilization: randomness and selectivity in pollen feeding by adult hoverflies.". Oecologia 78: 433–442.  
  14. ^ Sajjad, Asif; Saeed, Shafqat (2010). "Floral host plant range of syrphid flies (Syrphidae: Diptera) under natural conditions in southern punjab, Pakistan.". Pakistan Journal of Biology 42 (2): 1187–1200. 
  15. ^ Primante, Clara; Dotterl, Stefan (2010). "A syrphid fly uses olfactory cues to find a non-yellow flower.". Journal of Chemical Ecology 36: 1207–1210.  
  16. ^ Campbell, Alistair, J.; Biesmeijer, J. C.; Varma, V.; Wakers, F. L. (2012). "Realising multiple ecosystem services based on the response of three beneficial insect groups to floral traits and trait diversity.". Basic and applied ecology 13: 363–370.  
  17. ^ Stokl, Johannes; Brodmann; Dafni; Ayasse; Hansson (2011). "Smells like aphids: orchid flowers mimic aphid alarm pheromones to attract hoverflies for pollination.". Proc. R. Soc. B 278: 1216–1222.  
  18. ^ Shi, J.; Luo, Y.B.; Ran, J.C.; Liu, Z.J.; Zhou, Q. (2009). "Pollination by deceit in Paphiopedilum barbigerum (Orchidaceae): a staminode exploits innate colour preferences of hoverflies (Syrphidae).". Plant Biology 11: 17–28.  
  19. ^ "Diptera: Syrphidae". Landcare Research. Retrieved 2013-08-30. 
  20. ^ Grosskopf, Gitta (2005). "Biology and life history of Cheliosia urbana (Meigen) and Cheilosia psilophthalma (Becker), two sympatric hoverflies approved for the biological control of hawkweeds (Hieracium spp.) in New Zealand.". Biological Control 35: 142–154.  
  21. ^ Morris, Michael, C. (2000). "Coriander (Coriandrum sativum) "companion plants" can attract hover flies, and may reduce infestation in cabbages.". New Zealand Journal of Crop and Horticultural Science 28: 213–217.  
  22. ^ Hickman, Janice, M.; Lovei, G. L.; Wratten, S. D. (1995). "Pollen feeding by adults of the hoverfly Melanostoma fasciatum (Diptera: Syrphidae).". New Zealand Journal of Zoology 22: 387–392.  
  23. ^ Holloway, Beverley, A. (1976). "Pollen-feeding in hover-flies (Diptera:Syrphidae).". New Zealand Journal of Ecology 3 (4): 339–350.  
  24. ^ Campbell, Diane; Bischoff, M.; Lord, J. M.; Robertson, A. W. (2010). "Flower color influences insect visitation in alpine New Zealand.". Ecology 91 (9): 2638–2649.  
  25. ^ Bischoff, Mascha; Campbell, D. R.; Lord, J. M.; Robertson, A. W. (2013). "The relative importance of solitary bees and syrphid flies as pollinators of two outcrossing plant species in the New Zealand alpine.". Austral Ecology 38: 169–176.  
  26. ^ Sjöberg, Fredrik (2014). The Fly Trap. Particular Books. p. 197.  
  27. ^ Barkham, Patrick (14 June 2014). "'"Fredrik Sjöberg: 'I realised I had to write my book for people not interested in flies. The Guardian. Retrieved 15 March 2015. 

References

See also

Regional lists

  • Stubbs, A.E. and Falk, S.J. (2002) British Hoverflies An Illustrated Identification Guide. Pub. 1983 with 469 pages, 12 col plates, b/w illus.British Entomological and Natural History Society [ISBN 1-899935-05-3]. 276 species are described with extensive keys to aid identification. It displays 190 species on colour plates. 2nd edition, pub. 2002, includes new British species and name changes. It includes European species likely to appear in Britain. Additional black and white plates illustrate the male genitalia of the difficult genera Cheilosia and Sphaerophoria.
  • Vockeroth, J.R. A revision of the genera of the Syrphini (Diptera: Syrphidae) Memoirs of the Entomological Society of Canada, no. 62:1-176. Keys subfamilies, tribes and genera on a world basis and under regions.
  • van Veen, M.P. |(2004) "Hoverflies of Northwest Europe, Identification Keys to the Syrphidae". KNNV Publishing, Utrecht. [ISBN 9050111998]

Identification guides

Fredrik Sjöberg's book The Fly Trap concerns his enthusiasm for hoverflies on the island of Runmarö in the Baltic Sea.[26] The island is a hotspot for hoverflies and other insects; Sjöberg has collected 58 species of butterfly there, and (in seven years of hunting) 202 species of hoverfly, including 180 in his garden. He estimates that in 2014 just 25 hoverfly enthusiasts were in the whole of Sweden.[27]

Gardeners, therefore, sometimes use companion plants to attract hoverflies. Those reputed to do so include alyssum, Iberis umbellata, statice, buckwheat, chamomile, parsley, and yarrow.

Many species of hoverfly larvae prey upon pest insects, including aphids and the leafhoppers, which spread some diseases such as curly top. Therefore, they are seen in biocontrol as a natural means of reducing the levels of pests.

Relationship with people

Systematics

Syrphid flies are also common visitors to flowers in alpine zones in New Zealand. Native flies (Allograpta and Platycheirus) in alpine zones show preferences for flower species based on their colour in alpine zones; syrphid flies consistently choose yellow flowers over white regardless of species.[24] However, syrphid flies are not as effective pollinators of alpine herb species as native solitary bees.[25]

[23] Native hoverfly species

More than 40 species of syrphid flies are found in New Zealand[19] in a variety of habitats, including agricultural fields and alpine zones. Two hoverfly species in Switzerland are being investigated as potential biological control agents of hawkweeds in New Zealand.[20]

Case study - New Zealand

There are also a number of fascinating interactions between orchids and hoverflies. The orchid species Epipactis veratrifolia mimics alarm pheromones of aphids to attract hoverflies for pollination.[17] Another plant, the slipper orchid in southwest China, also achieves pollination by deceit by exploiting the innate yellow color preference of syrphide.[18]

Specific flower preferences differ between species but syrphid fly species have repeatedly been shown to prefer white and yellow coloured flowers.[14] Non-visual flower cues such as olfactory cues also help the flies to find flowers, especially those that are not yellow.[15] Many syrphid fly species have short, unspecialized mouth parts and tend to feed on flowers that are more open as the nectar and pollen can be easily accessed.[16]

Like many pollinator groups, syrphid flies range from species that take a generalist approach to foraging by visiting a wide range of plant species to those that specialize in a narrow range of plants.[12] Although hoverflies are often considered mainly non-selective pollinators, some hoverflies species are highly selective and carry pollen from one plant species.[13] It is thought that Cheilosia albitarsis will only visit Ranunculus repens.

Hoverflies are important pollinators of flowering plants in a variety of ecosystems worldwide.[11] Syrphid flies are frequent flower visitors to a wide range of wild plants as well as agricultural crops and are often considered the second most important group of pollinators after wild bees. However, there has been relatively little research into fly pollinators compared with bee species.[11] It is thought that bees are able to carry a greater volume of pollen on their bodies, but flies may be able to compensate for this by making a greater number of flower visits.

Hoverfly (Eupeodes corollae)
Episyrphus balteatus on flower

Pollination

While some hoverfly larvae are aquatic and are often found in stagnant water, those of species which prey upon aphids and other plant pests are usually terrestrial, residing on leaves.[10] Adults are often found near flowers, their principal food source being nectar and pollen.[2] Some species are found in more unusual locations; for example, members of the genus Volucella can be found in bumblebee nests, while members of Microdon are myrmecophiles, found in ant or termite nests.[1] Others can be found in decomposing vegetation.

Hoverflies are a cosmopolitan family found in most biomes, except deserts, tundra at extremely high latitudes, and Antarctica.[7][8] Certain species are more common in certain areas than others; for example, the American hoverfly, Eupeodes americanus, is common in the Nearctic ecozone, and the common hoverfly, Melangyna viridiceps, is common in the Australasia ecozone. About 6,000 species and 200 genera are in the family.[9]

Distribution and habitat

On occasion, hoverfly larvae have been known to cause accidental myiasis in humans. This occurs when the larva are accidentally ingested on food or from other sources. Myiasis causes discomfort, pain, or itching,[4][6] however, hoverflies do not normally prey upon humans and cases of myiasis from hoverflies are very rare.

An example of a well-known hoverfly maggot is the rat-tailed maggot, of the drone fly, Eristalis tenax. It has a breathing siphon at its rear end, giving it its name.[1] The species lives in stagnant water, such as sewage and lagoons.[4] The maggots also have a commercial use, and are sometimes sold for ice fishing.[5]

Unlike adults, the maggots of hoverflies feed on a variety of foods; some are saprotrophs, eating decaying plant or animal matter, while others are insectivores, eating aphids, thrips, and other plant-sucking insects.[1] This is beneficial to gardens, as aphids destroy crops, and hoverfly maggots are often used in biological control. Certain species, such as Lampetia equestris or Eumerus tuberculatus, are responsible for pollination.

Midair mating of Simosyrphus grandicornis

Reproduction and lifecycle

With a few exceptions (e.g.[3]), hoverflies are distinguished from other flies by a spurious vein, located parallel to the fourth longitudinal wing vein.[1] Adults feed mainly on nectar and pollen.[2] They also hover around flowers, lending to their common name.[1]

[1]. Despite this, hoverflies are harmless.Batesian mimicry; they exhibit bees or wasps Due to this coloring, they are often mistaken for [2] They are brightly colored, with spots, stripes, and bands of yellow or brown covering their bodies.[2]

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