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Behavior

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Sight and smell play a key role in the ability to locate food. First, sight helps the yellow jacket recognize flowers and potential prey. Next, smell helps guide these creatures to the particular flower from which she likes to drink. Chemical signals help wasps identify nest mates from potential competitors and enemies. Chemical signals called pheromones also help wasps communicate with one another about mating, food, and danger.

(Lyon, 2000)

Communication Channels: visual ; chemical

Other Communication Modes: pheromones ; vibrations

Perception Channels: visual ; tactile ; vibrations ; chemical

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Yoder, H. 2001. "Vespula maculifrons" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Vespula_maculifrons.html
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Heather Yoder, Southwestern University
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Conservation Status

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The Eastern Yellowjacket is found abundantly and is in no danger of becoming endangered. However, there is a non-native species, the German Yellowjacket, Vespula germanica that has recently moved into North America. This species is more aggressive than native yellowjackets, and may out-compete them. It is also more of a nuisance, as it nests more frequently in man-made structures.

(Lyon 2000)

US Federal List: no special status

CITES: no special status

State of Michigan List: no special status

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Yoder, H. 2001. "Vespula maculifrons" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Vespula_maculifrons.html
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Life Cycle

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Yellow jackets hatch from the egg as small, white, grub-like larvae. As they grow they feed on paste made from masticated insects that workers feed them. Once they have grown large enough they pupate. During this time they undergo a complete metamorphosis and emerge in their mature adult form.

The larval stage for the queen lasts about 12-18 days, while the larval stage of workers and males is slightly less.

Development - Life Cycle: metamorphosis

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Yoder, H. 2001. "Vespula maculifrons" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Vespula_maculifrons.html
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Benefits

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Eastern Yellowjackets will sting vigorously to defend themselves and their nest, so they can be a nuisance if the nest is located around people. Some people are especially allergic to the venom, and can have a very dangerous, or even fatal, reaction to being stung. These sites give suggestions on how to deal with yellowjacket nests:

(Lyon 2000)

Negative Impacts: injures humans (bites or stings, venomous )

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Yoder, H. 2001. "Vespula maculifrons" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Vespula_maculifrons.html
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Benefits

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Despite what many people think, the Eastern Yellowjacket provides a valuble service to farmers and gardeners by destroying many insects that attack cultivated and ornamental plants.

Positive Impacts: controls pest population

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Yoder, H. 2001. "Vespula maculifrons" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Vespula_maculifrons.html
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Trophic Strategy

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Adult yellow jackets feed only on nectar and fruit juices using their long tongues, while animal tissues (mostly insects and other arthropods, but occasionally carrion) are fed to larvae. Larvae jiggle around in their cells alerting nearby workers that they are hungry. A worker will then proceed to go out and capture a prey item. She then cuts the prey item into manageable pieces and carries it back to the nest piece by piece. Once the prey item is in the nest the worker masticates (chews) a piece of the prey into a paste with her mandibles. The workers then feed the larvae by tickling them. This tickling causes the larvae to secrete a liquid from their salivary glands. The worker feeds on the liquid, and while she is drinking she transfer the chewed up paste to the larvae. This process is termed malaxation.

Animal Foods: carrion ; insects; terrestrial non-insect arthropods

Plant Foods: fruit; nectar; sap or other plant fluids

Primary Diet: carnivore (Insectivore ); herbivore (Nectarivore )

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Yoder, H. 2001. "Vespula maculifrons" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Vespula_maculifrons.html
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Distribution

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Found throughout Eastern North America

Biogeographic Regions: nearctic (Native )

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Yoder, H. 2001. "Vespula maculifrons" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Vespula_maculifrons.html
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Habitat

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The Eastern Yellow jacket is a subterranean species, meaning it builds its nest below the ground. It is a generalist species, and so can live happily in urban, suburban, and agricultural areas.

Habitat Regions: temperate ; terrestrial

Terrestrial Biomes: savanna or grassland ; forest

Other Habitat Features: urban ; suburban ; agricultural

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Yoder, H. 2001. "Vespula maculifrons" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Vespula_maculifrons.html
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Life Expectancy

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Worker individuals live untill the first serious frosts of winter. Males die shortly after mating, while queens live for one year; building a nest and founding a colony the summer after which they mated.

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Yoder, H. 2001. "Vespula maculifrons" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Vespula_maculifrons.html
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Morphology

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The Eastern Yellow jacket ranges in size from 1.25-1.8 cm long, depending on its caste (queen, worker, male). Perhaps the most distinguishing features on the Eastern Yellow jacket are the black and yellow stripes that accent the abdomen. The patterns on the abdomen are also determined by caste. Vespula maculifrons workers are typically 1.25 cm in length and have abdominal markings that consist of thick black bands with a sliver of yellow between each band. The male yellow jacket is the same size, but he has a slightly different pattern of black and yellow than the worker. Males have one thick black band at the region closest to the thorax and as the band progresses towards the anus, the black bands decrease in thickness while the yellow bands increase in thickness. The queen Eastern Yellow jacket is slightly larger than the male and worker at 1.8 cm. The queen's markings consist of a large flared black band at the anterior region of the abdomen followed by thinner bands of black that progresses to the posterior end of the abdomen. In between the black bands are two dots that, if the point of the flare were extended towards the anus, would be located on either side of the imaginary line.

Female Eastern Yellow jackets have a stinger located on the posterior end of the abdomen (gaster). The yellow jacket is able to sting its victims repeatedly, however the stinger is slightly barbed and has a tendency to become stuck in the victim.

The yellow jacket also has well-developed mouthparts that are specially designed to capture and chew prey (such as many kinds of caterpillars). Along with strong jaws the yellow jacket has a highly developed tongue for sucking nectar and fruit juices from the plants.

Range length: 1.25 to 1.8 cm.

Other Physical Features: ectothermic ; bilateral symmetry ; venomous

Sexual Dimorphism: female larger; sexes colored or patterned differently

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Yoder, H. 2001. "Vespula maculifrons" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Vespula_maculifrons.html
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Reproduction

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In fall, males and young queens mate with one another. Shortly after copulation, males die while queens find a safe place to overwinter. The queen is the only reproducing member of the colony.

Mating System: eusocial

New colonies of the Eastern yellow jacket are founded in the spring by a single fertilized queen. The queen begins her task of laying eggs by first building a small nest and then laying eggs, which will give rise to the first generation of sterile female workers. The queen will continue to lay worker eggs until about halfway through the season. At this point the queen will lay fertilized female eggs (which will be next season's queens) and unfertilized eggs (which develop into males).

The yellow jacket queen seeks out a cavity in which to build her nest soon after emerging from hibernation. The cavity she chooses is usually an old rodent burrow or a dead tree root. She and her worker daughters will expand the nest as the colony grows, depositing the discarded material about an inch from the nest opening.

Once they emerge from the pupae, the new queens leave the nest to mate. Soon after mating with the female the male yellowjacket dies and the female must seek out shelter for the winter. Yellowjacket queens sometimes end up in houses, looking for winter shelter. The new queen stays dormant throughout the winter. In the spring she emerges from hibernation and seeks out a spot to found a new colony.

Yellowjacket populations are largly determined by the weather. For instance, if there is a sudden cold snap in early April, all of the queens that emerged before then will die, decreasing the population. During a good year the number of occupants for a single colony may reach 5,000. The queen will produce about 25,000 individuals during the course of the season, which may last from late March throught the middle of fall.

Breeding season: Mating occurs in the fall.

Average eggs per season: 25000.

Key Reproductive Features: semelparous ; sexual ; fertilization (Internal ); oviparous ; sperm-storing ; delayed fertilization

Like most social Hymenoptera, the founding queen cares for the first generation of brood, while all subsequent generations are cared for entirely by workers. Workers are also responsible for feeding and caring for the queen.

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Yoder, H. 2001. "Vespula maculifrons" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Vespula_maculifrons.html
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Eastern yellowjacket

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The eastern yellow jacket or eastern yellowjacket (Vespula maculifrons) is a wasp found in eastern North America.[1] Although most of their nests are subterranean, they are often considered a pest due to their nesting in recreational areas and buildings.[2] This yellow jacket is a social insect, living in colonies of hundreds to thousands of individuals.[3] Along with their subfamily, Vespinae, this species demonstrates supportive parental care for offspring, separation of reproductive and sterile castes, and overlapping generations.[4] They aggressively defend their hives from threats and are known to inflict painful stings.

Taxonomy and phylogenetics

V. maculifrons is within the family Vespidae, which is commonly found throughout the Northern Hemisphere. V. maculifrons is part of the subfamily Vespinae, and these species are part of the yellowjackets.[5] For example, V. maculifrons is commonly called the eastern yellowjacket and has the black and yellow color that distinguishes the yellowjackets.[3] The specific name maculifrons is derived from the Latin word macula, which means spot, and frons, which means forehead. This refers to the spots on the head of species, which is another distinguishing characteristic. Like other Vespula species, V. maculifrons is a social wasp. As a result, the species participates in cooperative brood care and division between reproductive and nonreproductive groups.[5]

Description and identification

V. maculifrons can be differentiated from other wasp species due to its smaller size and abdominal pattern.[3] The most recognizable features of V. maculifrons are the black and yellow lines on the head, thorax, and abdomen. While the body is curved and wider than the head, the abdomen narrows at its attachment to the thorax, which is thinner than the abdomen. The lines on the abdomen also differ based on caste, with the queens having one flared black line nearest the thorax followed by thinner black lines. Queens also have two black dots between each black line.[5] Individuals of this species range in size from 12.7–15.9 mm (0.5–0.625 in).[6] and weigh roughly 0.0014 oz (0.04 g).[7] The queens are the largest, followed by the males, and then the workers. A V. maculifrons nest can range from 94–300 mm (3.7–11.8 in) in diameter, allowing for hundreds to thousands of workers inside. A large nest can contain 10,000 to 15,000 cells, with a little less than a third of them dedicated to the larger queen cells.[5] The envelope of the nest is tan-brown to red-orange in color. It is constructed out of worn, decaying wood, which results in a fragile structure.[2] These nests are typically subterranean, but have been found in various sites above ground, including buildings.

Distribution and habitat

V. maculifrons is commonly found throughout eastern North America to the Great Plains. In most of the areas where it is found, V. maculifrons is the most common yellowjacket species. In the spring, the queen selects the spot where the colony will be located. Their subterranean nests are not deep, mostly covered by less than 50 mm (2 in) of soil.[2] However, nests have been found from just under the surface to 250 mm (9.8 in) deep.[2] These nests are found in hardwood forests and creek banks, but also in urban and suburban areas.[5] Within these areas, nests are typically built in sheltered places, which can include underground areas, tree stumps, and attics.[2] Their nests are so frequently found in recreational and residential areas, they are seen as a pest problem.

The queen begins the initial structure of the nest. By chewing wood and adding in saliva to make a quick-drying pulp, these wasps assemble paper nests. The first part of the nest constructed is the stalk, which eventually narrows into a cord and then expands again to make the first hexagonal cell. Other cells are then added to the sides of the first and an envelope is built around the first group of cells which form a miniature comb. The queen then lays eggs in these cells, which will become workers when hatched. As soon as the workers emerge from their larval state, the nest begins to enlarge rapidly. As more cells are added, the comb grows fast, and when enough cells are on the first comb, a second comb is added, and so on. To make room for more cells, the inner layers of the envelope are rechewed and used to make more envelope layers outside. Because most of the nests are located underground, the cavity in which the nest is built is enlarged by removing soil, carrying it and dropping it outside the nest.[8]

Venom chemistry

Vespulakinins were first discovered in V. maculifrons.[9][10][11] Yoshida et al 1976 discovered several of these bradykinin-like peptides[9][10][11] including vespulakinin 1 and vespulakinin 2.[11] They and the entire vespulakinin family are insecticidal and may prove useful for human purpose.[11]

Colony cycle

A colony consists of three types of individuals in a social group: queens, workers, and males. New colonies are founded annually during the spring. This is determined by location, but will occur around May or June in the northern regions and around September in southern regions.[7] Due to the seasonal differences, the northern cycle is typically shorter than in the south, resulting in smaller nest sizes.[5] A queen, which mated earlier in the year and spent the winter in diapause, founds a colony by raising the first group of workers.[12] Until the first offspring emerge as adults, the lone queen lays eggs, forages for food, cares for the young, and defends the nest.[13] These workers maintain and expand the nest when they mature, while the queen continues to produce more offspring.[12] The workers' job is to build 850 to 9700 cells, of which about 30% are dedicated to queen cells. When these queen cells begin to be constructed, the nest is said to have matured. In the north, colonies peak around August or September, while southern colonies tend to peak around October to November.[2] When winter comes, the colony dies and only some of the queens survive to begin a new colony the next nesting cycle.

Behavior

Communication

For V. maculifrons workers to communicate with others in the nest about a potential predator, they have an alarm pheromone that stimulates defense. This pheromone is linked to the sting apparatus and prompts attraction and attack. When the alarm pheromone is expressed, wasps around the nest entrance are typically seen circling, outlining a zigzagging flight, and going directly towards the target. However, foragers that were not at the nest when the pheromone was expressed do not respond in a similar manner. The facultative social parasite of V. maculifrons, Vespula squamosa, responds to the alarm response of V. maculifrons, suggesting common chemistry between pheromones.[14] Since V. squamosa is known to take over nests of V. maculifrons, selection for V. squamosa favors the ability to recognize and respond to alarm calls within the nest.

Mating behavior

Male/male interactions

Males of V. maculifrons tend to form loose aggregations, resembling leks, during mating.[15] In one area, hundreds to thousands of males patrol prominent trees and bushes by constantly flying around them. Males typically patrol large areas randomly, rather than limiting to a few trees. If a male sees a female while patrolling, he flies closer to the female in a zigzag fashion and stops on a nearby leaf. This then allows the male to climb onto the female's gaster from behind. Other males do not try to approach an ongoing copulation, but a male might try to copulate immediately after. If a second mating occurs, sperm competition may favor the second male. As a result, males can prevent competition from another male by elongating copulation.[15]

Female/male interactions

A queen is capable of mating starting 48 hours after emerging from the pupal stage. To find a male, queens fly to trees and bushes where males form aggregations. Males frequently groom their legs, antennae, and gasters throughout courtship, mating, and after contact with a queen. The queens have also been seen to groom the face and antennae, but only briefly. At the end of copulation, a queen is able to produce an olfactory or contact pheromone to signal release to the male. The queen also begins to nibble the dorsal surface of the male's gaster to further signal the end of copulation. Since both queens and males can mate multiple times, the queen's signals are advantageous if her spermatheca is full, thereby preventing the waste of resources and time. Male having strong genitalic locks for mating is also advantageous, due to male-male competition, but can cause problems during disengagement. In the laboratory, both females and males have died during disengagement, sometimes leaving reproductive ends attached to the opposite sex.[16]

Kin selection

Genetic relatedness within colonies

As a social species, V. maculifrons colonies depend on collaboration. However, polyandry tends to create subfamilies with lower relatedness, which can lead to conflict within the colony. Yet, V. maculifrons queens, and many other species’ queens, mate multiply. This occurrence is explained because potential conflict between subfamilies is offset by the reproductive success of queens; the mate number of queens is correlated to the number of queen cells a colony creates. This phenomenon may occur due to higher genetic diversity, which could lead to genetically varying workers that are more efficient at their jobs.[12]

Kin recognition and discrimination

As seen in many social insects, cuticular lipids are a source of communication among adults. In general, cuticular lipids function to avoid dehydration by acting as a seal to keep moisture in. However, the hydrocarbons on the surface of cuticular lipids can also serve in identifying the individual's species, and more importantly, kin. Kin recognition occurs because each species has a unique cuticular hydrocarbon composition. However, the composition between V. maculifrons and V. squamosa is very similar. This occurrence is advantageous to V. squamosa because the species is a social parasite of V. maculifrons, and their similar hydrocarbon compositions can act as a chemical camouflage to help V. squamosa parasitize nests. Also, minor differences occur between the cuticular hydrocarbon compositions of workers and queens.[17]

Worker queen conflict

When queen cell construction begins in late August to early September, it is in the male's best interest to mate with a queen and produce a gyne.[2] Similar wasp species illustrate workers that help their own kin or harm nonrelatives from growing as a gyne. Thus, reproductive competition occurs so that the genes of specific subfamilies can be passed on and survive. However, no evidence of reproductive competition exists within V. maculifrons colonies. Although a second male may occasionally attempt to grasp a queen immediately after copulation with another male, postcopulatory sperm competition is not common. In addition, reproductive skew among males is low.[18]

Life history and survivorship curves

Towards the end of the seasonal cycle, the gynes mate with multiple males. Then, around November to December, the colony begins to senesce.[3] At this point, the queens undergo diapause, which is a dormancy period to avoid the adverse environmental conditions of winter. During these months, only a few queens survive. Those that do typically exhibit larger overall body size, as well as a thin shape. However, specific genotypes and previous mating does not affect queen survival during this period.[19] Queen survival is very important because those that survive diapause are able initiate a new colony in the spring.

Licking sugar from a munchkin at Russell R. Kirt Prairie, Illinois

Interaction with other species

Diet

V. maculifrons is a polyphagous species, meaning that they feed on a variety of foods.[20] The number of trips a worker makes to forage depends on the age of the worker, as well as the size of the nest, since more food is necessary to feed a larger nest.[21] Workers dedicated to foraging are capable of olfactory learning, allowing them to distinguish odors specific to food.[20] Workers use this ability to scavenge for dead insects such as earwigs and fall webworm larvae, as well as live arthropods.[5] They are also frugivores, obtaining carbohydrates from fruits, nectar, and honeydew.[7] Workers go to flowers in an attempt to catch insects, but often end up feeding on nectar and pollinating the flower while doing so. They feed on honeydew, which is a sweet, sticky liquid. However, honeydew is susceptible to fermentation, causing individuals that feed on it to become inebriated and unable to fly or walk.[21] Since this species is attracted to sugar sources, they may be attracted to soft drinks or other foods consumed by humans.[3] Adults feed larvae with a chewed paste made from other insects and carrion.

Predators

V. maculifrons has many predators; most are mammals much larger than the wasps, such as raccoons, black bears, and skunks.[2] Raccoons have been found to be one of the main predators in Georgia and Indiana.[5] To consume the colony, raccoons dig to uncover the nest, distribute brood cells, and finally scrape individual broods away from the cell using their teeth.[2] Dolichovespula maculata is another predator of V. maculifrons and other yellowjacket species.[5] Predation of V. maculifrons may occur over other wasp species due to the shallow depths and fragile envelopes of their nests.

Parasites

Vespula squamosa is a common parasite of V. maculifrons, though they are facultative, which means they can live both independently and parasitically. Roughly 80% of V. squamosa colonies are parasitic, which can be determined if any V. maculifrons workers are present or if the nest itself has the characteristics of a V. maculifrons nest, such as its typical small, tan cells.[5] However, parasitic colonies were not as frequent in areas of unobstructed forest.[2] In the colonies that do become parasitic, a V. squamosa queen forcibly takes control of the nest from the host queen. Then, the host colony's workers raise the first brood of V. squamosa, until their own workers are mature.[5] Eventually, all V. maculifrons workers will die out.[22]

Commensals

Commensalism, which is a relationship where one organism benefits from living on or with another organism without harm, occurs with two species of muscid flies: Fannia canicularis, which is commonly known as the lesser house fly, and Dendrophaonia querceti. Females of both species lay their eggs directly on the outer portion of the nest envelope. So when the eggs hatch, the larvae fall into the soil below the nest, where waste products and debris also fall.[2] The larvae feed on this waste, thereby preventing waste and debris buildup under the nest.

Economic importance

Eastern yellow jackets destroy many insects that consume cultivated and ornamental plants, providing a valuable service to humans. They can, however, be a source of irritation when their nests are located near homes. They are adept at stinging, especially if the nest is threatened. Not to be confused with certain bees that die after a single sting, these wasps may sting repeatedly whenever they feel it necessary and can inflict a very painful sting.[3]

References

  1. ^ Hoffman, Eric A., Kovacs, Jennifer L. and Goodisman, Michael A. D. (August 20, 2008). Genetic structure and breeding system in a social wasp and its social parasite. BMC Evolutionary Biology.
  2. ^ a b c d e f g h i j k MacDonald, J. F.; Matthews, R. W. (1981). "Nesting biology of the Eastern Yellowjacket, Vespula maculifrons (Hymenoptera: Vespidae)". Journal of the Kansas Entomological Society. 54 (3): 433–57. JSTOR 25084177.
  3. ^ a b c d e f Yellowjackets and Hornets: Vespula and Dolichovespula spp. (Insecta: Hymenoptera: Vespidae). Grissell, E.E. and Fasulo, T.R. 2007. University of Florida IFAS Extension, pp. 1-5.
  4. ^ Buck, Matthias; Marshall, Stephen A.; Cheung, David K. B. (2008). "Identification Atlas of the Vespidae (Hymenoptera, Aculeata) of the northeastern Nearctic region". Canadian Journal of Arthropod Identification. 5: 20–21, 402–403.
  5. ^ a b c d e f g h i j k Greene, Albert, John F. Macdonald, Peter J. Landolt, and Harry G. Davis. "Biology." in The Yellowjackets of America North of Mexico. By Roger D. Akre. Washington, D.C.: U.S. Dept. of Agriculture, 1980. 3+. Print.
  6. ^ Milne, Lorus and Milne, Margery. (1980). Yellow Jackets. The Audubon Society Field Guide to North American Insects and Spiders. s.l. : Alfred A. Knopf, Inc. pp. 836-837.
  7. ^ a b c Coelho, J.R.; Ross, A.J. (1996). "Body temperature and thermoregulation in two species of yellowjackets, Vespula germanica and V. maculifrons". Journal of Comparative Physiology B. 166 (1): 68–76. doi:10.1007/bf00264641. S2CID 23683216.
  8. ^ Andrews, Christopher. (1971). The Lives of Wasps and Bees. New York:American Elsevier Publishing Company, Inc. pp.100-107.
  9. ^ a b Schmidt, Justin O. (1982). "Biochemistry Of Insect Venoms". Annual Review of Entomology. Annual Reviews. 27 (1): 339–368. doi:10.1146/annurev.en.27.010182.002011. ISSN 0066-4170.
  10. ^ a b Norris, Gillian E.; Patchett, Mark L. (2014-09-12). "14 Glycosylated Ribosomally Synthesized Peptide Toxins". In Havlíček, Vladimír; Spížek, Jaroslav (eds.). Natural Products Analysis. Hoboken, NJ: Wiley. pp. 507–543. ISBN 978-1-118-87601-5. S2CID 83103479.
  11. ^ a b c d Schwartz, Elisabeth F.; Mourão, Caroline B. F.; Moreira, Karla G.; Camargos, Thalita S.; Mortari, Márcia R. (2012). "Arthropod venoms: A vast arsenal of insecticidal neuropeptides". Biopolymers. American Peptide Society (Wiley). 98 (4): 385–405. doi:10.1002/bip.22100. ISSN 0006-3525. PMID 23193602. S2CID 20594739.
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  13. ^ Evans, Howard E. and West Eberhard, Mary Jane. The Wasps. Ann Arbor : The University of Michigan Press, 1970.
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Eastern yellowjacket: Brief Summary

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The eastern yellow jacket or eastern yellowjacket (Vespula maculifrons) is a wasp found in eastern North America. Although most of their nests are subterranean, they are often considered a pest due to their nesting in recreational areas and buildings. This yellow jacket is a social insect, living in colonies of hundreds to thousands of individuals. Along with their subfamily, Vespinae, this species demonstrates supportive parental care for offspring, separation of reproductive and sterile castes, and overlapping generations. They aggressively defend their hives from threats and are known to inflict painful stings.

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