Yellowjacket

Yellowjacket or yellow jacket is the common name in North America for predatory social wasps of the genera Vespula and Dolichovespula. Members of these genera are known simply as "wasps" in other English-speaking countries. Most of these are black and yellow like the eastern yellowjacket Vespula maculifrons and the aerial yellowjacket Dolichovespula arenaria; some are black and white like the bald-faced hornet, Dolichovespula maculata. Others may have the abdomen background color red instead of black. They can be identified by their distinctive markings, their occurrence only in colonies, and a characteristic, rapid, side-to-side flight pattern prior to landing. All females are capable of stinging. Yellowjackets are important predators of pest insects.[1]

This article is about a type of wasp. For the protest movement originating in France, see Yellow vests movement. For other uses, see Yellowjacket (disambiguation).

Yellowjacket
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Insecta
Order:
Hymenoptera
Family:
Vespidae
Subfamily:
Vespinae
Genus:
Vespula or Dolichovespula

Identification
Yellowjacket stinger in its sheath in a scanning electron microscope
Face of a southern yellowjacket (Vespula squamosa)

Yellowjackets may be confused with other wasps, such as hornets and paper wasps such as Polistes dominula. A typical yellowjacket worker is about 12 mm (0.5 in) long, with alternating bands on the abdomen; the queen is larger, about 19 mm (0.75 in) long (the different patterns on their abdomens help separate various species).

Yellowjackets are sometimes mistakenly called "bees" (as in "meat bees"), given that they are similar in size and general coloration to honey bees, but yellowjackets are actually wasps. In contrast to honey bees, yellowjackets have yellow or white markings, are not covered with tan-brown dense hair on their bodies, do not carry pollen, and do not have the flattened, hairy hind legs used to carry it.

Yellowjackets have lance-like stingers with small barbs, and typically sting repeatedly,[1] though occasionally a stinger becomes lodged and pulls free of the wasp's body; the venom, like most bee and wasp venoms, is primarily dangerous to only those humans who are allergic or are stung many times. All species have yellow or white on their faces. Their mouthparts are well-developed with strong mandibles for capturing and chewing insects, with probosces for sucking nectar, fruit, and other juices. Yellowjackets build nests in trees, shrubs, or in protected places such as inside man-made structures, or in soil cavities, tree stumps, mouse burrows, etc. They build them from wood fiber they chew into a paper-like pulp. Many other insects exhibit protective mimicry of aggressive, stinging yellowjackets; in addition to numerous bees and wasps (Müllerian mimicry), the list includes some flies, moths, and beetles (Batesian mimicry).

Yellowjackets' closest relatives, the hornets, closely resemble them, but have larger heads, seen especially in the large distance from the eyes to the back of the head.[1]

Life cycle and habits
Vespula squamosa queen

Yellowjackets are social hunters living in colonies containing workers, queens, and males (drones). Colonies are annual with only inseminated queens overwintering. Fertilized queens are found in protected places such as in hollow logs, in stumps, under bark, in leaf litter, in soil cavities, and in man-made structures. Queens emerge during the warm days of late spring or early summer, select a nest site, and build a small paper nest in which they lay eggs. After eggs hatch from the 30 to 50 brood cells, the queen feeds the young larvae for about 18 to 20 days. Larvae pupate, then emerge later as small, infertile females called workers. Workers in the colony take over caring for the larvae, feeding them with chewed up meat or fruit. By midsummer, the first adult workers emerge and assume the tasks of nest expansion, foraging for food, care of the queen and larvae, and colony defense.

From this time until her death in the autumn, the queen remains inside the nest, laying eggs. The colony then expands rapidly, reaching a maximum size of 4000 to 5000[2] workers and a nest of 10,000 to 15,000 cells in late summer. The species V. squamosa, in the southern part of its range, may build much larger perennial colonies populated by scores of queens, tens of thousands of workers, and hundreds of thousands of cells. At peak size, reproductive cells are built with new males and queens produced. Adult reproductives remain in the nest fed by the workers. New queens build up fat reserves to overwinter. Adult reproductives leave the parent colony to mate. After mating, males quickly die, while fertilized queens seek protected places to overwinter. Parent colony workers dwindle, usually leaving the nest to die, as does the founding queen. Abandoned nests rapidly decompose and disintegrate during the winter. They can persist as long as they are kept dry, but are rarely used again. In the spring, the cycle is repeated; weather in the spring is the most important factor in colony establishment.

The diet of the adult yellowjacket consists primarily of items rich in sugars and carbohydrates, such as fruits, flower nectar, and tree sap. Larvae feed on proteins derived from insects, meats, and fish. Workers collect, chew, and condition such foods before feeding them to the larvae. Many of the insects collected by the workers are considered pest species, making the yellowjacket beneficial to agriculture.[3] Larvae, in return, secrete a sugary substance for workers to eat; this exchange is a form of trophallaxis. As insect sources of food diminish in late summer, larvae produce less for workers to eat. Foraging workers pursue sources of sugar outside the nest including ripe fruits and human garbage.[3]

Notable species

Nest
Two-year yellowjacket nest, with a one-gallon (3.8-liter) container for size reference. Collected in Alabama, USA, 2007. Dimensions approximately 18 inches by 24 inches by 12 inches (46 cm by 61 cm by 30 cm).

Dolichovespula species such as the aerial yellowjacket, D. arenaria, and the bald-faced hornet, tend to create exposed aerial nests. This feature is shared with some true hornets, which has led to some naming confusion.

Vespula species, in contrast, build concealed nests, usually underground.

Yellowjacket nests usually last for only one season, dying off in winter. The nest is started by a single queen, called the "foundress". Typically, a nest can reach the size of a basketball by the end of a season. In parts of Australia, New Zealand, the Pacific Islands, and southwestern coastal areas of the United States, the winters are mild enough to allow nest overwintering. Nests that survive multiple seasons become massive and often possess multiple egg-laying queens.[4][5]

In the United States

The German yellowjacket (V. germanica) first appeared in Ohio in 1975, and has now become the dominant species over the eastern yellowjacket. It is bold and aggressive, and can sting repeatedly and painfully. It will mark aggressors and pursue them. It is often confused with Polistes dominula, an invasive species in the United States, due to their very similar pattern. The German yellowjacket builds its nests in cavities—not necessarily underground—with the peak worker population in temperate areas between 1000 and 3000 individuals between May and August. Each colony produces several thousand new reproductives after this point through November.

The eastern yellowjacket builds its nests underground, also with the peak worker population between 1000 and 3000 individuals, similar to the German yellowjacket. Nests are built entirely of wood fiber and are completely enclosed except for a small entrance at the bottom. The color of the paper is highly dependent on the source of the wood fibers used. The nests contain multiple, horizontal tiers of combs within. Larvae hang within the combs.

In the southeastern United States, where southern yellowjacket (Vespula squamosa) nests may persist through the winter, colony sizes of this species may reach 100,000 adult wasps.[4] The same kind of nest expansion has occurred in Hawaii with the invasive western yellowjacket (V. pensylvanica).[6]

Detail of Giovanna Garzoni's Still Life with Bowl of Citrons, 17th century

The yellowjacket's most visible place in American popular culture is as a mascot, most famously with the Georgia Tech Yellow Jackets, represented by the mascot Buzz. The yellow jacket is also the mascot of Berkeley High School, in Berkeley, California. Other college and university examples include the American International College, Baldwin-Wallace University, Black Hills State University, Cedarville University, Defiance College, Graceland University, Howard Payne University, LeTourneau University, Montana State University Billings, Randolph-Macon College, University of Rochester, University of Wisconsin–Superior, West Virginia State University, and Waynesburg University.

Though not specified by the team, the mascot of the Columbus Blue Jackets, named "Stinger," closely resembles a yellowjacket. In the years since its original yellow incarnation, the mascot's color has been changed to a light green, seemingly combining the real insect's yellow and the team's blue.[7]

Note that yellowjacket is often spelled as two words (yellow jacket) in popular culture and even in some dictionaries. The proper entomological spelling, according to the Entomological Society of America, is as a single word (yellowjacket).[8]

gollark: I would have preferred... not an Arduino Nano... but there weren't any.
gollark: We have implemented a fix for this, i.e. offloading all motor control to a spare Arduino Nano.
gollark: No, it just suddenly stopped working after being connected wrong.
gollark: Use parser combinators obviously*.
gollark: One of the inductors in the power-supply-ish region appeared to have had its cover blown off.

See also

References
  1. Akre, R. D. et al. (1980). The Yellowjackets of America North of Mexico. USDA Agriculture Handbook 552. 102 pp.
  2. Lives of Social Insects Peggy Larson p.13
  3. "About Yellowjackets and the Benefits of Wasps in the Garden". Mother Earth News.
  4. "Yellow jackets building enormous nests". TuscaloosaNews.com. Retrieved 2013-01-14.
  5. Extension Daily: What is Causing Super-sized Yellow Jacket Nests? Archived 2007-06-29 at the Wayback Machine
  6. "Response of Native Plant Communities to Alien Species Management on the Island of Hawaii" on the Hawaiian Cooperative Studies Program website
  7. "Which NHL mascot would you want with you in a bar fight?". 2018-03-19.
  8. "Common Names of Insects Database | Entomological Society of America". Entsoc.org. Retrieved 2018-06-25.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.