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Overview

Brief Summary

The German wasp, Vespula germanica, is a vespid wasp native to Europe, Northern Africa and temperate Asia, that have recently invaded much of the new world (North America and South America), Australia and New Zealand, where they pose a significant pest to indigenous fauna. These wasps are still spreading, for example, along the western coast of the United States where they arrived in about 1980 and into Patagonia in 1990; in these new areas they are far more destructive to the environment than in regions where they are well established. German wasps are aggressive hunters of insects, which they masticate and feed to their larvae, and require large amounts of protein to feed their brood. The adults themselves eat pollen, nectar, other carbohydrates and secretions produced by their young. Although V. germanica can play a positive role in diminishing numbers of pest insects, this wasp also out-competes native species for food resources as well as directly killing native species to extinction, especially in recently invaded habitats. Vespula germanica also has a large negative impact on human activities such as bee-keeping, cattle rearing, and fruit orchards. German wasps look very similar to the closely related common wasp (Vespula vulgaris), but have a different coloration pattern on their face and back. These wasps and others of the genera Vespula and Dolichovespula are known in the United States as yellowjackets. Like other yellowjackets, German wasps build their paper nests in crevices near to or on the ground (as opposed to hornets, which hang their nests in places six feet or higher). A colony consists of a queen and up to several thousand sterile workers when the nest is fully mature. In the fall the queen stops laying worker eggs, and lays queen eggs and male (drone) eggs and the nest begins to decline. The new queens mate (with drones from other nests) and then only the queens overwinter, to form a new nest the following spring. In mild winters of New Zealand about 10% of German wasp nests do not die over the winter, and these nests become very large and troublesome. Methods of toxic bait traps, using synthetic pheromones and natural food attractants, are important and effective for local and temporary reduction of populations, however more permanent methods for eliminating colonies are more difficult. (CABI, 2011; Reierson et al. 2009; Sackmann et al. 2001; Wikipedia 2011)

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Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

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Ecology

Associations

Flowering Plants Visited by Vespula germanica in Illinois

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Animal / associate
larva of Fannia vesparia is associated with nest of Vespula germanica

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Vespula germanica

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 2
Specimens with Barcodes: 21
Species With Barcodes: 1
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Barcode data: Vespula germanica

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There are 2 barcode sequences available from BOLD and GenBank.  Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.  See the BOLD taxonomy browser for more complete information about this specimen and other sequences.

ACATTATATTTTATTTTCGCTTTATGAGCAGGAACTTTAGGAGCTTCAATA---AGAATAATTATTCGTTTAGAATTAAGATCCCCTGGAGCTTTAATTAATAAT---GATCAAATTTATAATACTATTATTACAGCTCATGCTTTCATTATAATTTTCTTTATAGTTATACCTTTTTTAGTTGGAGGATTTGGAAATTGATTAATCCCTTTAATA---TTAGGTGTTCCTGATATAGCATTTCCTCGAATAAATAATATAAGATTTTGATTATTACCTCCATCCTTATTTTTATTAATCTTAAGAAATTTTATTGGAACCGGAGTAGGAACAGGATGAACTCTATACCCTCCTTTATCATCAATTGTAGGACATGACTCTCCCTCTGTAGACTTAGGA---ATTTTTTCTATCCATATTGCTGGAATTTCATCAATTATAGGTTCAATTAATTTTATTGTTACTATTTTAAATATACACACAAAAACACATTCACTAAATTTTCTTCCTTTATTTTCATGATCAATTTTAATTACAGCAATTCTTCTCTTGTTATCTCTACCAGTTCTTGCAGGA---GCAATTACTATACTTCTTACAGACCGTAATTTAAATACATCTTTCTTTGATCCTGCAGGCGGAGGTGACCCAATTTTATATCAACATTTATTTTGATTTTTTGGTCACCCAGAAGTTTATATTTTAATTTTACCTGGCTTTGGTTTAATTTCTCATATTATTACTAATGAAAGAGGAAAAAAA---GAAATTTTTGGTTCCTTAGGAATAATTTATGCTATAATTGCTATTGGTATATTAGGTTTTATTGTTTGAGCTCATCATATATTTACTGTTGGATTAGATATTGATACTCGTGCATATTTTACATCTGCAACTATAATTATTGCTATTCCCACAGGAATTAAAGTATTTAGATGATTA---GCAACAATTTACGGTT
-- end --

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Wikipedia

Vespula germanica

Vespula germanica (European wasp, German wasp, or German yellowjacket), is a wasp found in much of the Northern Hemisphere, native to Europe, northern Africa, and temperate Asia. It has been introduced and is well-established in many other places, including North America, South America (Argentina and Chile), Australia, and New Zealand. German wasps are part of the family Vespidae and are sometimes mistakenly referred to as paper wasps because they build grey paper nests, although strictly speaking, paper wasps are part of the subfamily Polistinae. In North America, they are also known as yellowjackets.

Identification[edit]

The German wasp is about 13 mm (0.5 in) long, has a mass of 74.1 ± 9.6 mg,[1] and has typical wasp colours of black and yellow. It is very similar to the common wasp (Vespula vulgaris), but seen head on, its face has three tiny black dots. German wasps also have black dots on their abdomen, while the common wasp's analogous markings are fused with the black rings above them, forming a different pattern.

Nests[edit]

German wasp rasping wood for building its nest

The nest is made from chewed plant fibres, mixed with saliva. It is generally found close to or in the ground, rather than higher up on bushes and trees like hornets. It has open cells and a petiole attaching the nest to the substrate. The wasps produce a chemical which repels ants, and secrete it around the base of this petiole to avoid ant predation.

A solitary female queen starts the nest, building 20–30 cells before initial egg-laying. This phase begins in spring, depending on climatic conditions. She fashions a petiole and produces a single cell at the end of it. Six further cells are then added around this to produce the characteristic hexagonal shape of the nest cells.

The three dots on the German wasp's face distinguish it from the common wasp.

Once the larvae have hatched as workers, they take up most of the colony’s foraging, brood care, and nest maintenance. A finished nest may be 20–30 cm across and contain 3,000 individuals.

Each wasp colony includes one queen and a number of sterile workers. Colonies usually last only one year, all but the queen dying at the onset of winter. However, in mild climates such as New Zealand, around 10% of the colonies survive the winter. New queens and males (drones) are produced towards the end of the summer, and after mating, the queen overwinters in a crack or other sheltered location.

This common and widespread wasp collects insects, including caterpillars, to feed to its larvae, and is therefore generally beneficial. The adults feed on nectar and sweet fruit, and are also attracted to human food and food waste, particularly sugary drinks and meats.

The nests are subject to predation by the honey buzzard, which excavates them to obtain the larvae. The hoverfly Volucella pellucens and some of its relatives lay their eggs in the wasps' nests, and the larvae feed on the wasps' young.

Pest status[edit]

This species is considered a pest in most areas outside its native range, though its long residency in North America is such that it is not treated with any level of urgency there, in contrast to areas such as South America, where the introduction is more recent, and the impacts far more dramatic, prompting a greater degree of concern over control measures (e.g.[2]).

Workers at the nest entrance

Along with the closely related common wasp and two species of Polistes, the German wasp is considered to be a pest in New Zealand. It was probably introduced in the late 19th century, but did not appear in large numbers until around 1940.[3] Wasp numbers reach their greatest densities in beech forest of the South Island, due to the abundance of honeydew produced by the beech scale insect in this type of forest. It has a serious effect on the forest ecology, since less honeydew is available for the native birds. German wasps were, however, quickly succeeded in much of the South Island and its beech forests by the introduction of the common wasp in the 1970s.[4][5]

In domestic situations, nests have been known to become very large, sometimes taking up entire attic spaces in houses. This is ascribed to the comparatively mild winters experienced in New Zealand, as opposed to the wasp's usual European habitat.

The European wasp is also considered a pest in Australia.[6]

An unusual attempt at wasp control is related from Abercairney in Scotland, where until the 1950s, children were encouraged to compete in the Wasp Cup, awarded to the competitor who handed in the most queen wasps. The wasps were stuck to card and a payment of 1 d was made for each; totals of 40 were not uncommon.[7]

Adult foraging on flowers


References[edit]

  1. ^ "Does size matter? — Thermoregulation of ‘heavyweight’ and ‘lightweight’ wasps". Retrieved 16 May 2013. 
  2. ^ Successful Removal of German Yellow Jackets by Toxic Baiting
  3. ^ Pest Animal Control Bay of Plenty environment report. Retrieved 7 January 2007
  4. ^ R. J. Harris, C. D. Thomas & H. Moller (1991). "The influence of habitat use and foraging on the replacement of one introduced wasp species by another in New Zealand". Ecological Entomology 16 (4): 441–448. doi:10.1111/j.1365-2311.1991.tb00237.x. 
  5. ^ "Vespula Wasp Factsheet". Department of Conservation. Retrieved 2012-05-19. 
  6. ^ Museum Victoria > European Wasps in Australia Accessed 30 January 2013
  7. ^ Holder, Geoff (2007). The Guide to Mysterious Perthshire. Stroud : Tempus. ISBN 978-0-7524-4140-5. p. 149.
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