Papilio cresphontes

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Giant swallowtail
Giant Swallowtail, Shirleys Bay.jpg
Status TNC G5.svg
Secure  (NatureServe) [1]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Papilionidae
Genus: Papilio
Species:
P. cresphontes
Binomial name
Papilio cresphontes
Cramer, [1777]
Synonyms

Heraclides oxilusHübner, [1819]
Papilio cresphontes var. maxwelliFranck, 1919
Papilio cresphontes pennsylvanicusF. Chermock & R. Chermock, 1945

Contents

The giant swallowtail (Papilio cresphontes) is the largest butterfly in North America. [2] It is abundant through many parts of eastern North America; populations from western North America and down into Panama are now (as of 2014) considered to belong to a different species, Papilio rumiko . [3] Though it is often valued in gardens for its striking appearance, its larval stage can be a serious pest to citrus farms, which has earned its caterpillars the names orange dog or orange puppy. [4] The giant swallowtail caterpillars possess remarkable camouflage from predators by closely resembling bird droppings. They use this, along with their osmeteria, to defend against predators such as wasps, flies, and vertebrates. [4] [5]

Geographic range

The giant swallowtail is common across the United States, reaching as far north as southern New England and southern Canada. South of the United States, it is found in parts of Mexico and also found in Jamaica and Cuba. The species was historically considered to occur in the western United States and into South America, [4] but now those populations are treated as a separate species, Papilio rumiko , based largely on DNA evidence. [3]

Habitat

In the United States, P. cresphontes mostly inhabit deciduous forest and citrus orchards. They are only capable of overwintering in Florida and the deep South. [2]

Description

One of the giant swallowtail's most notable features is its size. Females have an average wingspan of 5.5 in (14 cm), and up to 6.9 in (18 cm), while males' average is 5.8 in (15 cm), and up to 7.4 in (19 cm).

The wings are black with a horizontal yellow line across the forewings, and a diagonal yellow line across the hindwing. The underside of the wings is yellow with accents of black. A small patch of red on the ventral wing (within the small blue band) allows for distinction from the similar-looking Schaus' swallowtail. [4] Seitz -"P. cresphontes Cr. (7a). Usually considered a slightly different variety of P. thoas . No cell-spot on the forewing; the fifth discal spot projecting further than the sixth. Claspers of the male separate above, the anal hook quite short, the lower part of the anal segment likewise quite different from that of P. thoas ; harpe broad, rounded. A common species in eastern North America, occurring as far as Costa Rica in the south and southern Canada in the north; but the insect is a wanderer, which is found only now and then in the northern districts. In the United States it does not extend westward beyond the Mississippi plain, except in the Southern States. Its true home is the region adjoining the Gulf of Mexico. It occurs also on Cuba. [6]

Food resources

Caterpillars

As well as eating valuable citrus crops, larvae eat a wide variety of plants in the family Rutaceae (citrus plants), including different types of prickly ash. They also consume some exotic Rutaceae species that have been introduced to North America, such as gasplant and sapote.

Feeding specialization

In specific local subpopulations (studied in Wisconsin, Ohio, and Florida), it was found that giant swallowtail caterpillars do better on their local host plant than on other giant swallowtail host plants. The local host caused the larva to develop faster than other plants that were also edible to the larva. However, this feeding specialization hypothesis has not been tested in the species as a whole beyond these three regions. [5]

Adults

Nectar plants for adults include Lantana , Azaleas, Bougainvilla, Saponaria officinalis , Hesperis matronalis , Solidago, Lonicera japonica , and Asclepias incarnata . [4] Along with flower nectar, adults can also consume liquid from animal waste. [4]

Life history

Eggs

Females lay eggs on the tops of the leaves of one of their preferred host plants. This is because the first larval instars are unable to move from plant to plant, so the mother must select an appropriate plant to support them. One egg is lain at a time, as opposed to in clutches. The small egg (1–1.5 mm) is brownish colored, but appears more orange due to a special orange colored secretion. [4]

Caterpillars

Once emerged from the eggs, there are five larval instars, wherein the larva grow to about 2 inches before pupating. Larvae are mostly nocturnal, feeding at night. Their appearance changes slightly throughout the instars, with the younger ones having setae and the older instars lacking setae. [4] The caterpillars have remarkable camouflage patterns. [5]

Pupation

Larvae must find a vertical plant, or sometimes a man-made object, to form their chrysalis on, and often they choose the host plant they already occupy. [4] They attach themselves to their substrate of choice and molt to reveal a brown, mottled chrysalis (resembling a bit of dead twig) in which they remain for approximately 10–12 days.

Mating

Males search for females along set flight paths and near host plants, and mate with females in the afternoon. [4] [2] Male and female then copulate facing away from each other. [7]

Enemies

Parasites

Giant swallowtails are most vulnerable to parasites when they are in their chrysalis. Common parasites include flies and wasps such as Brachymeria robusta , Pteromalus cassotis , Pteromalus vanessae, and Lespesia rileyi . [4]

Protective coloration and behavior

Larvae have many adaptations to protect themselves from predators.

Coloration

The caterpillars' intricate coloring patterns are an effective camouflage and defense against both vertebrate and invertebrate predators and parasites. It is thought that the coloration was naturally selected for because of its imitation of bird and lizard droppings. The caterpillar mimics certain droppings based on its habitat and which instar it is. [5] The caterpillars' coloration, particularly the saddle pattern, is also thought to be disruptive coloration. This means the coloration makes it harder for a predator to distinguish the shape of the camouflaged prey, which explains the continuation of this coloration pattern in larger instars that are too large to be mistaken for bird droppings. [5] It has also been hypothesized that the older instars' pattern is meant to be reminiscent of a snake. [4]

Other defensive measures

When camouflage is not enough, larvae will employ their osmeteria when they are threatened. The osmeterium is an organ behind the head that “inflates” into an orange/red Y-shaped growth that resembles a snake's forked tongue. By the fourth instar, the osmeterium is more than just a startle mechanism and also has bad-smelling and toxic mixture of acidic chemicals. This is only effective on small invertebrate predators, and the caterpillar will try to rub its osmeterium on the predator to deter it. [4] It has been experimentally tested and found that osmeteria are ineffective at deterring predation from birds. [8]

Physiology

Identifying host plants

Giant swallowtail butterflies must correctly identify their host plants by antennal sensitivity to the specific volatile compounds in the plants. A study found that antennal response to these volatiles depends upon the concentration of the volatiles, the host plant of origin (whether it is a primary or secondary host), and the sex of the butterfly. This last dependency is thought to be because the females, not the males, must identify the correct host plant for egg laying. [9]

Flight

Because of the butterfly's notably large wingspan (14 to 18 cm), giant swallowtails are very strong fliers and are able to glide long distances with very few wing beats. [4]

Interactions with humans

Sometimes referred to as "orange dogs", "orange pups", or "bird poop caterpillars" [10] by farmers, the larva targets all varieties of citrus plants, often causing significant damage to new foliage and younger trees, which they can more thoroughly defoliate. Large mature citrus trees are not generally significantly impacted. Outside of farms, the species is valued for its aesthetic appeal and can also be raised to butterflies successfully at home.

Control

Biological insecticides, such as Bacillus thuringiensis , as well as chemical insecticides, are used to protect trees against larvae. [4] Methionine, an essential amino acid in humans, has also been found to be an effective killer of caterpillars, with possible use as a nontoxic pesticide against giant swallowtail larvae. [11]

Effects of climate change

There has been a northern expansion of the range of the giant swallowtail in recent years which has been linked to increasingly warm temperatures, and particularly to a lack of September frosts in regions of expansion starting in 2001. Larvae were then able to withstand a few frosts before they pupated. The immediate effects of this warming, as well as their effect on host plants and predators, can explain the giant swallowtail's range expansion. [12]

Related Research Articles

<i>Papilio glaucus</i> Species of insect

Papilio glaucus, the eastern tiger swallowtail, is a species of butterfly native to eastern North America. It is one of the most familiar butterflies in the eastern United States, ranging north to southern Ontario, Canada, and is common in many different habitats. It flies from spring until fall, during which it produces two to three broods. Adults feed on the nectar of many species of flowers, mostly from those of the families Apocynaceae, Asteraceae, and Fabaceae. P. glaucus has a wingspan measuring 7.9 to 14 cm. The male is yellow with four black "tiger stripes" on each forewing. Females may be either yellow or black, making them dimorphic. The yellow morph is similar to the male, but with a conspicuous band of blue spots along the hindwing, while the dark morph is almost completely black.

<span class="mw-page-title-main">Swallowtail butterfly</span> Butterflies of family Papilionidae

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<i>Papilio polyxenes</i> Species of insect

Papilio polyxenes, the (eastern) black swallowtail, American swallowtail or parsnip swallowtail, is a butterfly found throughout much of North America. An extremely similar-appearing species, Papilio joanae, occurs in the Ozark Mountains region, but it appears to be closely related to Papilio machaon, rather than P. polyxenes. The species is named after the figure in Greek mythology, Polyxena, who was the youngest daughter of King Priam of Troy. Its caterpillar is called the parsley worm because the caterpillar feeds on parsley.

<i>Papilio troilus</i> Species of butterfly

Papilio troilus, the spicebush swallowtail or green-clouded butterfly, is a common black swallowtail butterfly found in North America. It has two subspecies, Papilio troilus troilus and Papilio troilus ilioneus, the latter found mainly in the Florida peninsula. The spicebush swallowtail derives its name from its most common host plant, the spicebush, members of the genus Lindera.

<span class="mw-page-title-main">Osmeterium</span> Odoriferous defensive structure

The osmeterium is a defensive organ found in all papilionid larvae, in all stages. The organ is situated in the prothoracic segment and can be everted when the larva feels threatened. The everted organ resembles a fleshy forked tongue, and this along with the large eye-like spots on the body might be used to startle birds and small reptiles. The osmeterial organ remains inside the body in the thoracic region in an inverted position and is everted when the larva is disturbed in any way emitting a foul, disagreeable odor which serves to repel ants, small spiders and mantids. To humans, this odour is rather strong but not unpleasant, usually smelling like a concentrated scent of the caterpillar's food plant and pineapple.

<i>Papilio rutulus</i> Species of butterfly

Papilio rutulus, the western tiger swallowtail, is a swallowtail butterfly belonging to the Papilionidae family. The species was first described by Hippolyte Lucas in 1852.

<i>Papilio helenus</i> Species of butterfly

Papilio helenus, the red Helen, is a large swallowtail butterfly found in forests of southern India and parts of southeast Asia.

<i>Papilio demoleus</i> Species of butterfly

Papilio demoleus is a common and widespread swallowtail butterfly. The butterfly is also known as the lime butterfly, lemon butterfly, lime swallowtail, and chequered swallowtail. These common names refer to their host plants, which are usually citrus species such as the cultivated lime. Unlike most swallowtail butterflies, it does not have a prominent tail. When the adult stage is taken into consideration, the lime swallowtail is the shortest-lived butterfly, with male adults dying after four days and females after a week. The butterfly is native to Asia and Australia, and can be considered an invasive pest in other parts of the world. The butterfly has spread to Hispaniola island in the Western Hemisphere, and to Mahé, Seychelles.

<i>Papilio polymnestor</i> Species of butterfly

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<i>Papilio protenor</i> Species of butterfly

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<i>Papilio demodocus</i> Species of butterfly

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<i>Papilio aegeus</i> Species of butterfly

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<i>Papilio homerus</i> Species of butterfly

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<i>Papilio xuthus</i> Species of butterfly

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<i>Papilio appalachiensis</i> Species of butterfly

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<i>Papilio canadensis</i> Species of butterfly

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<i>Papilio aristodemus</i> Species of butterfly

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<i>Papilio rumiko</i> Species of butterfly

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References

  1. "Papilio cresphontes - Cramer, 1777 Giant Swallowtail". NatureServe Explorer. NatureServe. 2009-08-19. Retrieved 2010-08-24.
  2. 1 2 3 Fadamiro, Henry; Chen, Li; Akotsen-Mensah, Clement; Setzer, William N. (2010-03-01). "Antennal electrophysiological responses of the giant swallowtail butterfly, Papilio cresphontes, to the essential oils of Zanthoxylum clava-herculis and related plants". Chemoecology. 20 (1): 25–33. doi:10.1007/s00049-009-0039-1. ISSN   0937-7409. S2CID   43390643.
  3. 1 2 A new Heraclides swallowtail (Lepidoptera, Papilionidae) from North America is recognized by the pattern on its neck
  4. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 "Giant Swallowtail, Orangedog, Papilio cresphontes Cramer (Insecta: Lepidoptera: Papilionidae)1 (PDF Download Available)". ResearchGate. Retrieved 2017-10-22.
  5. 1 2 3 4 5 Minno, M. C.; Emmel, T. C. (1992-05-01). "Larval protective coloration in swallowtails from the Florida Keys (Lepidoptera: Papilionidae)". Tropical Lepidoptera Research. 3 (1): 47–49. ISSN   1941-7659.
  6. Jordan, K., in Seitz, A. ( 1907) . The Macrolepidoptera of the World. 5: The Macrolepidoptera of the American faunistic region. Papilionidae 1-45 PD-icon.svg This article incorporates text from this source, which is in the public domain .
  7. "Giant Swallowtail Butterfly (Papilio Cresphontes) | Ninnescah Biology Field Station, Kansas". ninnescahlife.wichita.edu. Retrieved 2017-11-29.
  8. "CAB Direct". www.cabdirect.org. Retrieved 2017-10-24.
  9. MI), Scriber, J.M. (Michigan State University, East Lansing; R.V., Dowell (1991). "Host plant suitability and a test of the feeding specialization hypothesis using Papilio cresphontes (Lepidoptera: Papilionidae)". The Great Lakes Entomologist (USA). ISSN   0090-0222.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  10. Costello, Bill (4 November 2014). "The Bird Poop Caterpillar". Scott Arboretum. Swarthmore College. Retrieved 26 March 2021.
  11. Lewis, Delano S.; Cuda, James P.; Stevens, Bruce R. (December 2011). "A novel biorational pesticide: efficacy of methionine against Heraclides (Papilio) cresphontes, a surrogate of the invasive Princeps (Papilio) demoleus (Lepidoptera: Papilionidae)". Journal of Economic Entomology. 104 (6): 1986–1990. doi: 10.1603/ec11132 . ISSN   0022-0493. PMID   22299361. S2CID   45255198.
  12. Finkbeiner, Susan D.; Reed, Robert D.; Dirig, Robert; Losey, John E. (2011-07-01). "The Role of Environmental Factors in the Northeastern Range Expansion of Papilio cresphontes Cramer (Papilionidae)". Journal of the Lepidopterists' Society. 65 (2): 119–125. doi: 10.18473/lepi.v65i2.a4 . ISSN   0024-0966. S2CID   87666043.

Further reading