Ophryocystis elektroscirrha

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Ophryocystis elektroscirrha
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Clade: Diaphoretickes
Clade: SAR
Clade: Alveolata
Phylum: Apicomplexa
Class: Conoidasida
Order: Neogregarinorida
Family: Ophryocystidae
Genus: Ophryocystis
Species:
O. elektroscirrha
Binomial name
Ophryocystis elektroscirrha
McLaughlin & Myers, 1970

Ophryocystis elektroscirrha (sometimes abbreviated OE or O.e. [1] ) is an obligate, neogregarine protozoan parasite that infects monarch (Danaus plexippus) and queen (Danaus gilippus) butterflies. There are no other known hosts. The species was first discovered in Florida, around the late 1960s. [2] Since then, it has been found in every monarch population examined to date, including monarchs sampled in North America, Hawaii, Australia, Cuba, and Central and South America.

Contents

Dormant spores occur on the cuticles of butterflies, in between the butterfly's scales. They are small, brown or black objects about 1/100 the width of a butterfly scale.

The only currently known way of treating the Ophryocystis parasite is by soaking the host's eggs in a light bleach solution, which kills the spores that are present on the eggs' surface. [3]

Life cycle

Ophryocystis elektroscirrha is most often transmitted from females to their offspring, when spores stick to the female's body and get scattered on her eggs and the surface of milkweed leaves, the host plants of monarch and queen caterpillars. [4] [5] Male butterflies can also have O. elektroscirrha, and can scatter the dormant spores onto milkweed leaves as they fly around, or pass them onto females during mating. [6]

Spores of O. elektroscirrha are ingested by the caterpillars when they eat their egg chorion (shell) after they hatch, and when they feed from infected milkweed. Once the parasite has entered the host's gut, the spores open and emerging sporozoites penetrate the gut wall and migrate to the hypoderm (the layer of cells that secrete the larva's cuticle), where they undergo two phases of vegetative reproduction. [7] After the caterpillar pupates, O. elektroscirrha starts reproducing sexually. Three days before the adults emerge, developing parasite spores can be seen through their pupal integuments. The adult butterflies emerge covered with spores, mostly on their abdomens. Parasites do not continue to replicate on adult butterflies, and spores must be eaten by larvae before they can cause new infections. [7]

Effects

Adult monarch with Ophryocystis elektroscirrha. Monarch - Danaus plexippus with Ophryocystis elektroscirrha, Meadowood SRMA, Mason Neck, Virginia, October 10, 2021 (52189200154).jpg
Adult monarch with Ophryocystis elektroscirrha.

O. elektroscirrha is geographically widespread and may have a long history of occurrence with monarch butterflies. Infection by O. elektroscirrha causes monarchs to have lower survival rates. O. elektroscirrha has negative effects on survival and fitness. This is more severe when larvae ingest a larger number of spores, and are infected at earlier instars. Statistically significant infection rates result in abnormal adult eclosion. High infection can result in smaller wingspans and lower weights. Mating success decreases with higher parasite loads and, though females that mate and lay eggs have a shorter lifespan, they have no decrease in egg-laying. Spores are passed from female to caterpillar. Parasite levels vary between geographical populations ranging from 70% to 3%. This is not the case in laboratory rearing, where after a few generations, all individuals can be infected. [8]

Infection with this parasite results in culling. Migrating monarchs that are infected are less likely to complete the migration. Populations which migrate have lower parasite loads than those which are non-migratory. [6]

Infection rates

The prevalence (proportion of butterflies infected) with O. elektroscirrha is highly variable and it varies inversely with host migration distances. Non-migratory populations can have an infection rate of up to 70%. 30% of the western migratory population are also infected. Less than 8% of monarchs from the eastern migratory population are heavily infected. [8]

O. elektroscirrha parasites are viable for two weeks across a range of temperatures (3–32 °C), but prolonged high heat causes a decrease in spore viability. [9]

Anti-parasitic properties of milkweed

Adult female monarchs who are infected with O. elektroscirrha have been found to preferentially lay their eggs on varieties of milkweed that have higher levels of cardenolides, compounds which are toxic to the parasite and help to reduce spore loads and lower its virulence. [7]

Tropical milkweed, Asclepias curassavica, has higher anti-parasite properties than swamp milkweed, A. incarnata. [7]

Related Research Articles

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<span class="mw-page-title-main">Danainae</span> Subfamily of butterfly family Nymphalidae

Danainae is a subfamily of the family Nymphalidae, the brush-footed butterflies. It includes the Daniadae, or milkweed butterflies, who lay their eggs on various milkweeds on which their larvae (caterpillars) feed, as well as the clearwing butterflies (Ithomiini), and the tellervini.

<span class="mw-page-title-main">Monarch butterfly</span> Milkweed butterfly in the family Nymphalidae

The monarch butterfly or simply monarch is a milkweed butterfly in the family Nymphalidae. Other common names, depending on region, include milkweed, common tiger, wanderer, and black-veined brown. It is among the most familiar of North American butterflies and an iconic pollinator, although it is not an especially effective pollinator of milkweeds. Its wings feature an easily recognizable black, orange, and white pattern, with a wingspan of 8.9–10.2 cm (3.5–4.0 in). A Müllerian mimic, the viceroy butterfly, is similar in color and pattern, but is markedly smaller and has an extra black stripe across each hindwing.

<i>Asclepias</i> Genus of flowering plants

Asclepias is a genus of herbaceous, perennial, flowering plants known as milkweeds, named for their latex, a milky substance containing cardiac glycosides termed cardenolides, exuded where cells are damaged. Most species are toxic to humans and many other species, primarily due to the presence of cardenolides. However, as with many such plants, some species feed upon milkweed leaves or the nectar from their flowers. A noteworthy feeder on milkweeds is the monarch butterfly, which uses and requires certain milkweeds as host plants for their larvae.

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The viceroy is a North American butterfly. It was long thought to be a Batesian mimic of the monarch butterfly, but since the viceroy is also distasteful to predators, it is now considered a Müllerian mimic instead.

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Danaus chrysippus, also known as the plain tiger, African queen, or African monarch, is a medium-sized butterfly widespread in Asia, Australia and Africa. It belongs to the Danainae subfamily of the brush-footed butterfly family Nymphalidae. Danainae primarily consume plants in the genus Asclepias, more commonly called milkweed. Milkweed contains toxic compounds, cardenolides, which are often consumed and stored by many butterflies. Because of their emetic properties, the plain tiger is unpalatable to most predators. As a result, its colouration is widely mimicked by other species of butterflies. The plain tiger inhabits a wide variety of habitats, although it is less likely to thrive in jungle-like conditions and is most often found in drier, wide-open areas.

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Asclepias linaria is a species of milkweed known by the common name pineneedle milkweed.

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<i>Asclepias lanceolata</i> Species of plant

Asclepias lanceolata, the fewflower milkweed, is a species of milkweed that is native to the coastal plain of the United States from New Jersey to Florida and Southeast Texas. A. lanceolata is an upright, perennial plant that can grow between 3 and 5 feet tall, with red-orange flowers blooming in the summer months. It can also be referred to as Cedar Hill milkweed, as it was first described by Dr. Eli Ives in the neighborhood of Cedar Hill in New Haven, Connecticut.

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References

  1. "What is OE?" Archived 2018-04-17 at the Wayback Machine Project Monarch Health of the University of Georgia. Retrieved February 8, 2017
  2. R. E. McLaughlin & J. Myers (1970). "Ophryocystis elektroscirrha sp. n. a neogregarine pathogen of the monarch butterfly Danaus plexippus (L.) and the Florida queen butterfly Danaus gilippus berenice Cramer". Journal of Protozoology. 17 (2): 300–305. doi:10.1111/j.1550-7408.1970.tb02375.x.
  3. "OE". Archived from the original on 2016-01-28. Retrieved 2016-01-30.
  4. "What is OE?". monarch. Retrieved 2023-10-11.
  5. Pocius, V. M.; Debinski, D. M.; Pleasants, J. M.; Bidne, K. G.; Brower, L. P. (2017). "Milkweed Matters: Monarch Butterfly (Lepidoptera: Nymphalidae) Survival and Development on Nine Midwestern Milkweed Species". Environmental Entomology. 46 (5): 1098–1105. doi:10.1093/ee/nvx137. PMC   5850784 . PMID   28961914.
  6. 1 2 Bartel, Rebecca; Oberhauser, Karen; De Roode, Jacob; Atizer, Sonya (February 2011). "Monarch butterfly migration and parasite transmission in eastern North America". Ecology . 92 (2): 342–351. Bibcode:2011Ecol...92..342B. doi:10.1890/10-0489.1. PMC   7163749 . PMID   21618914. S2CID   9018584.
  7. 1 2 3 4 Lefèvre, T. (September 2011). "Behavioural resistance against a protozoan parasite in the monarch butterfly". Journal of Animal Ecology. 81: 70–79. doi:10.1111/j.1365-2656.2011.01901.x. PMID   21939438.
  8. 1 2 Leong, K. L. H.; M. A. Yoshimura; H. K. Kaya; H. Williams (1997). "Instar Susceptibility of the Monarch Butterfly (Danaus plexippus) to the Neogregarine Parasite, Ophryocystis elektroscirrha". Journal of Invertebrate Pathology . 69 (1): 79–83. Bibcode:1997JInvP..69...79L. CiteSeerX   10.1.1.494.9827 . doi:10.1006/jipa.1996.4634. PMID   9028932.
  9. Ragonese, I. G.; Sarkar, M. R.; Hall, R. J.; Altizer, S. (2024). "Extreme heat reduces host and parasite performance in a butterfly–parasite interaction". Biological Sciences. 291 (2015). doi:10.1098/rspb.2023.2305 via The Royal Society Publishing.