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Parasitoid

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In evolutionary ecology, a parasitoid is an organism that lives in close association with its host at the host's expense, eventually resulting in the death of the host. Parasitoidism is one of six major evolutionary strategies within parasitism, distinguished by the fatal prognosis for the host, which makes the strategy close to predation.

A parasitoid wasp (Trioxys complanatus, Aphidiinae) ovipositing into the body of a spotted alfalfa aphid (Therioaphis maculata, Calaphidinae), a behaviour that is used in biological pest control[a][2]

Among parasitoids, strategies range from living inside the host (endoparasitism), allowing it to continue growing before emerging as an adult, to paralysing the host and living outside it (ectoparasitism). Hosts can include other parasitoids, resulting in hyperparasitism; in the case of oak galls, up to five levels of parasitism are possible. Some parasitoids influence their host's behaviour in ways that favour the propagation of the parasitoid.

Parasitoids are found in a variety of taxa across the insect superorder Endopterygota, whose complete metamorphosis may have pre-adapted them for a split lifestyle, with parasitoid larvae and free-living adults. Most are in the Hymenoptera, where the ichneumons and many other parasitoid wasps are highly specialised for a parasitoidal way of life. There are parasitoids, too, in the Diptera, Coleoptera and other orders of endopterygote insects. Some of these, usually but not only wasps, are used in biological pest control.

The 17th-century zoological artist Maria Sibylla Merian closely observed parasitoids and their hosts in her paintings. The biology of parasitoidism influenced Charles Darwin's beliefs and has inspired science fiction authors and scriptwriters to create numerous parasitoidal aliens that kill their human hosts, such as the alien species in Ridley Scott's 1979 film Alien.

Etymology

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The term "parasitoid" was coined in 1913 by the Swedo-Finnish writer Odo Reuter,[3] and adopted in English by his reviewer,[4] the entomologist William Morton Wheeler.[5] Reuter used it to describe the strategy where the parasite develops in or on the body of a single host individual, eventually killing that host, while the adult is free-living. Since that time, the concept has been generalised and widely applied.[6]

Strategies

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Evolutionary options

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A perspective on the evolutionary options can be gained by considering four questions: the effect on the reproductive fitness of a parasite's hosts; the number of hosts they have per life stage; whether the host is prevented from reproducing; and whether the effect depends on intensity (number of parasites per host). From this analysis, proposed by K. D. Lafferty and A. M. Kunis, the major evolutionary strategies of parasitism emerge, alongside predation.[7]

Evolutionary strategies in parasitism and predation[7]
(intensity-dependent: green, roman;
       intensity-independent: purple, italics)
Host fitness Single host, stays alive Single host, dies Multiple hosts
Able to
reproduce
(fitness > 0)		 Conventional parasite
   Pathogen		 Trophically transmitted parasite[b]
   Trophically transmitted pathogen		 Micropredator
   Micropredator
Unable to
reproduce
(fitness = 0)		 —
   Parasitic castrator		 Trophically transmitted parasitic castrator
   Parasitoid		 Social predator[c]
   Solitary predator

Parasitoidism, in the view of R. Poulin and H. S. Randhawa, is one of six main evolutionary strategies within parasitism, the others being parasitic castrator, directly transmitted parasite, trophically transmitted parasite, vector-transmitted parasite, and micropredator. These are adaptive peaks, with many possible intermediate strategies, but organisms in many different groups have consistently converged on these six.[8][9]

Parasitoids feed on a living host which they eventually kill, typically before it can produce offspring, whereas conventional parasites usually do not kill their hosts, and predators typically kill their prey immediately.[10][11]

Basic concepts

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A hyperparasitoid chalcidoid wasp on the cocoons of its host, a braconid wasp, itself a koinobiont parasitoid of Lepidoptera

Parasitoids can be classified as either endo- or ectoparasitoids with idiobiont or koinobiont developmental strategies. Endoparasitoids live within their host's body, while ectoparasitoids feed on the host from outside. Idiobiont parasitoids prevent further development of the host after initially immobilising it, whereas koinobiont parasitoids allow the host to continue its development while feeding upon it. Most ectoparasitoids are idiobiont, as the host could damage or dislodge the external parasitoid if allowed to move and moult. Most endoparasitoids are koinobionts, giving them the advantage of a host that continues to grow larger and avoid predators.[12]

Primary parasitoids have the simplest parasitic relationship, involving two organisms, the host and the parasitoid. Hyperparasitoids are parasitoids of parasitoids; secondary parasitoids have a primary parasitoid as their host, so there are three organisms involved. Hyperparasitoids are either facultative (can be a primary parasitoid or a hyperparasitoid depending on the situation) or obligate (always develop as a hyperparasitoid). Levels of parasitoids beyond secondary also occur, especially among facultative parasitoids. In oak gall systems, there can be up to five levels of parasitism.[13] Cases in which two or more species of parasitoids simultaneously attack the same host without parasitizing each other are called multi- or multiple parasitism. In many cases, multiple parasitism still leads to the death of one or more of the parasitoids involved. If multiple parasitoids of the same species coexist in a single host, it is called superparasitism. Gregarious species lay multiple eggs or polyembryonic eggs which lead to multiple larvae in a single host. The end result of gregarious superparasitism can be a single surviving parasitoid individual or multiple surviving individuals, depending on the species. If superparasitism occurs accidentally in normally solitary species the larvae often fight among themselves until only one is left.[14][15]

Influencing host behaviour

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Female phorid fly Apocephalus borealis (centre left) ovipositing into the abdomen of a worker honey bee, altering its behaviour
Further information: Behavior-altering parasite

In another strategy, some parasitoids influence the host's behaviour in ways that favour the propagation of the parasitoid, often at the cost of the host's life. A spectacular example is the lancet liver fluke, which causes host ants to die clinging to grass stalks, where grazers or birds may be expected to eat them and complete the parasitoidal fluke's life cycle in its definitive host. Similarly, as strepsipteran parasitoids of ants mature, they cause the hosts to climb high on grass stalks, positions that are risky, but favour the emergence of the strepsipterans.[16] Among pathogens of mammals, the rabies virus affects the host's central nervous system, eventually killing it, but perhaps helping to disseminate the virus by modifying the host's behaviour.[17] Among the parasitic wasps, Glyptapanteles modifies the behaviour of its host caterpillar to defend the pupae of the wasps after they emerge from the caterpillar's body.[18] The phorid fly Apocephalus borealis oviposits into the abdomen of its hosts, including honey bees, causing them to abandon their nest, flying from it at night and soon dying, allowing the next generation of flies to emerge outside the hive.[19]

Taxonomic range

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About 10% of described insects are parasitoids, in the orders Hymenoptera, Diptera, Coleoptera, Neuroptera, Lepidoptera, Strepsiptera, and Trichoptera. The majority are wasps within the Hymenoptera; most of the others are Dipteran flies.[6][20][21] Parasitoidism has evolved independently many times: once each in Hymenoptera, Strepsiptera, Neuroptera, and Trichoptera, twice in the Lepidoptera, 10 times or more in Coleoptera, and no less than 21 times among the Diptera. These are all holometabolous insects (Endopterygota, which form a single clade), and it is always the larvae that are parasitoidal.[22] The metamorphosis from active larva to an adult with a different body structure permits the dual lifestyle of parasitic larva, freeliving adult in this group.[23] These relationships are shown on the phylogenetic tree;[24][25] groups containing parasitoids are shown in boldface, e.g. Coleoptera, with the number of times parasitoidism evolved in the group in parentheses, e.g. (10 clades). The approximate number (estimates can vary widely) of parasitoid species[26] out of the total is shown in square brackets, e.g. [2,500 of 400,000].

Endopterygota
Neuropterida

Raphidioptera

Megaloptera

Neuroptera (net-winged insects) (1 clade) [c. 15 of 6,000]

Coleopterida

Coleoptera (beetles) (10 clades) [c. 2,500 of 400,000]  

(1 clade)

Strepsiptera (twisted-wing parasites) [600 of 600]  

Hymenoptera

Symphyta

(1 clade)

Orussoidea (parasitic wood wasps) [75 of 75]  

Apocrita (wasp-waisted insects) [c. 50,000 of 100,000]  

Panorpida

Diptera (true flies) (21 clades) [c. 17,000 of 125,000]  

Trichoptera (caddis flies) (1 clade) [c. 10 of 14,500]

Lepidoptera (butterflies, moths) (2 clades) [c. 40 of 180,000]  

Hymenoptera

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Main article: Parasitoid wasp
 
Potter wasp, an idiobiont, building a mud nest; she will provision it with paralysed insects, on which she will lay her eggs; she will then seal the nest and provide no further care for her young

Within the Hymenoptera, parasitoidism evolved just once, and the many described[d] species of parasitoid wasps[27] represent the great majority of species in the order, barring those like the ants, bees, and Vespidae wasps that have secondarily lost the parasitoid habit. The parasitoid wasps include some 25,000 Ichneumonoidea, 22,000 Chalcidoidea, 5,500 Vespoidea, 4,000 Platygastroidea, 3,000 Chrysidoidea, 2,300 Cynipoidea, and many smaller families.[26] These often have remarkable life cycles.[28] They can be classified as either endoparasitic or ectoparasitic according to where they lay their eggs.[29] Endoparasitic wasps insert their eggs inside their host, usually as koinobionts, allowing the host to continue to grow (thus providing more food to the wasp larvae), moult, and evade predators. Ectoparasitic wasps deposit theirs outside the host's body, usually as idiobionts, immediately paralysing the host to prevent it from escaping or throwing off the parasite. They often carry the host to a nest where it will remain undisturbed for the wasp larva to feed on.[6] Most species of wasps attack the eggs or larvae of their host, but some attack adults. Oviposition depends on finding the host and on evading host defences; the ovipositor is a tube-like organ used to inject eggs into hosts, sometimes much longer than the wasp's body.[30][31][32] Hosts such as ants often behave as if aware of the wasps' presence, making violent movements to prevent oviposition. Wasps may wait for the host to stop moving, and then attack suddenly.[33]

Parasitoid wasps face a range of obstacles to oviposition,[6] including behavioural, morphological, physiological and immunological defences of their hosts.[29][34] To thwart this, some wasps inundate their host with their eggs so as to overload its immune system's ability to encapsulate foreign bodies;[35] others introduce a virus which interferes with the host's immune system.[36] Some parasitoid wasps locate hosts by detecting the chemicals that plants release to defend against insect herbivores.[37]

Other orders

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The head of a sessile female strepsipteran protruding (lower right) from the abdomen of its wasp host; the male (not shown) has wings

The true flies (Diptera) include several families of parasitoids, the largest of which is the Tachinidae (some 9,200 species[26]), followed by the Bombyliidae (some 4,500 species[26]), along with the Pipunculidae and the Conopidae, which includes parasitoidal genera such as Stylogaster. Other families of flies include some protelean species.[38] Some Phoridae are parasitoids of ants.[39][40] Some flesh flies are parasitoids: for instance Emblemasoma auditrix is parasitoidal on cicadas, locating its host by sound.[41]

The Strepsiptera (twisted-wing parasites) consist entirely of parasitoids; they usually sterilise their hosts.[42]

Two beetle families, Ripiphoridae (450 species[26])[43][44] and Rhipiceridae, are largely parasitoids, as are Aleochara Staphylinidae; in all, some 400 staphylinids are parasitoidal.[26][38][45] Some 1,600 species of the large and mainly freeliving family Carabidae are parasitoids.[26]

A few Neuroptera are parasitoidal; they have larvae that actively search for hosts.[46] The larvae of some Mantispidae, subfamily Symphrasinae, are parasitoids of other arthropods including bees and wasps.[26]

Although nearly all Lepidoptera (butterflies and moths) are herbivorous, a few species are parasitic. The larvae of Epipyropidae feed on Homoptera such as leafhoppers and cicadas, and sometimes on other Lepidoptera. The larvae of Cyclotornidae parasitise first Homoptera and later ant brood.[47] The pyralid moth Chalcoela has been used in biological control of the wasp Polistes in the Galapagos Islands.[22]

Parasitism is rare in the Trichoptera (caddisflies), but it is found among the Hydroptilidae (purse-case caddisflies), probably including all 10 species in the Orthotrichia aberrans group; they parasitise the pupae of other trichopterans.[48]

Mites of the family Acarophenacidae are ectoparasitoids of insect eggs. Unlike the insect parasitoids, it is the adult stage in Acarophenacidae that acts as a parasitoid. Specifically, adult female mites feed on insect eggs and their body swells up with offspring, which eventually emerge as adults.[49]

Entomopathogenic fungi

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All known fungi in the genera Cordyceps and Ophiocordyceps are endoparasitic.[50] One of the most notable fungal parasitoids is O. unilateralis which infects carpenter ants by breaching the ant's exoskeletons via their spores and growing in the ant's hemocoel as free living yeast cells. Eventually the yeast cells progress to producing nerve toxins to alter the behaviour of the ant causing it to climb and bite onto vegetation, known as the 'death bite'.[51] This approach is so fine-tuned it causes the ant to bite down on the part of the leaf most optimal for the fungus to fruit; the adaxial leaf midrib. In fact, it has been found that in specific circumstances, the time of the death bite is synchronised to solar noon.[52] As much as 40% of the ant's biomass is fungal hyphae at the moment of the death bite.[53] After the ant dies, the fungus produces a large stalk, growing from the back of the ant's head[54] which subsequently releases ascospores. These spores are too large to be wind dispersed and instead fall directly to the ground where they produce secondary spores that infect ants as they walk over them.[55] O. sinesis, is a parasitoid as well, parasitising ghost moth larvae, killing them within 15-25 days, a similar process to that of O. unilateralis.[56]

Learning in parasitoids

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Host location has been studied in Ormia ochracea, a parasitoid tachinid fly that locates their field cricket host acoustically (phonotaxis).[57] Preference for the dominant local host species was not explained by DNA analysis. In fact, populations across the southern U.S. were inexplicably closely related, considering rate of range expansion from a presumed Central American origin.[58] A captive population of lab-reared flies were raised on two different host songs (Gryllus integer or G. lineaticeps). Responsive adult females overwhelmingly chose their familiar song, indicating the use of a learned, auditory search image. This phenotypic plasticity allows such a highly specialized parasitoid to avoid overspecialization disasters. Interestingly, when receptive females only heard silence the night before testing for preference, they chose the host songs equally, 50/50.[59] This capacity for learning and use of search images paired with a highly specialized morphology and lifestyle (eg. tympana tuned to host sound cues, larviparous) supports the extraordinarily fast range expansion of O. ochracea, as well as the presence and power of learning in parasitoids.

Interactions with humans

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In biological pest control

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Main article: Biological pest control
 
Encarsia formosa, an endoparasitic aphelinid wasp, bred commercially to control whitefly in greenhouses

Parasitoids are among the most widely used biological control agents. Classic biological pest control using natural enemies of pests (parasitoids or predators) is extremely cost effective, the cost/benefit ratio for classic control being 1:250, but the technique is more variable in its effects than pesticides; it reduces rather than eliminates pests. The cost/benefit ratio for screening natural enemies is similarly far higher than for screening chemicals: 1:30 against 1:5 respectively, since the search for suitable natural enemies can be guided accurately with ecological knowledge. Natural enemies are more difficult to produce and to distribute than chemicals, as they have a shelf life of weeks at most; and they face a commercial obstacle, namely that they cannot be patented.[60][61]

From the point of view of the farmer or horticulturalist, the most important groups are the ichneumonid wasps, which prey mainly on caterpillars of butterflies and moths; braconid wasps, which attack caterpillars and a wide range of other insects including greenfly; chalcidoid wasps, which parasitise eggs and larvae of greenfly, whitefly, cabbage caterpillars, and scale insects; and tachinid flies, which parasitise a wide range of insects including caterpillars, adult and larval beetles, and true bugs.[62] Commercially, there are two types of rearing systems: short-term seasonal daily output with high production of parasitoids per day, and long-term year-round low daily output with a range in production of 4–1000 million female parasitoids per week, to meet demand for suitable biological control agents for different crops.[63][64]

Maria Sibylla Merian

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Parasitic wasps (centre right) with their garden tiger moth host, by Maria Sibylla Merian

Maria Sibylla Merian (1647–1717) was one of the first naturalists to study and depict parasitoids and their insect hosts in her closely-observed paintings.[65]

Charles Darwin

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Parasitoids influenced the religious thinking of Charles Darwin,[e] who wrote in an 1860 letter to the American naturalist Asa Gray: "I cannot persuade myself that a beneficent and omnipotent God would have designedly created parasitic wasps with the express intention of their feeding within the living bodies of Caterpillars."[67] The palaeontologist Donald Prothero notes that religiously minded people of the Victorian era, including Darwin, were horrified by this instance of evident cruelty in nature, particularly noticeable in the ichneumonid wasps.[68]

In science fiction

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Further information: Parasites in fiction and Alien (creature in Alien franchise)
 
A 1990s gargoyle at Paisley Abbey, Scotland, resembling a Xenomorph[69] parasitoid from the film Alien[70]

Parasitoids have inspired science fiction authors and screenwriters to create terrifying parasitic alien species that kill their human hosts.[71] One of the best-known is the Xenomorph in Ridley Scott's 1979 film Alien, which runs rapidly through its lifecycle from violently entering a human host's mouth to bursting fatally from the host's chest.[72][73][74] The molecular biologist Alex Sercel, writing in Signal to Noise Magazine, compares "the biology of the [Alien] Xenomorphs to parasitoid wasps and nematomorph worms from Earth to illustrate how close to reality the biology of these aliens is and to discuss this exceptional instance of science inspiring artists".[75] Sercel notes that the way the Xenomorph grasps a human's face to implant its embryo is comparable to the way a parasitoid wasp lays its eggs in a living host. He further compares the Xenomorph life cycle to that of the nematomorph Paragordius tricuspidatus which grows to fill its host's body cavity before bursting out and killing it.[75] Alistair Dove, on the science website Deep Sea News, writes that there are multiple parallels with parasitoids, though there are in his view more disturbing life cycles in real biology. In his view, the parallels include the placing of an embryo in the host; its growth in the host; the resulting death of the host; and alternating generations, as in the Digenea (trematodes).[76] The social anthropologist Marika Moisseeff argues that "The parasitical and swarming aspects of insect reproduction make these animals favoured villains in Hollywood science fiction. The battle of culture against nature is depicted as an unending combat between humanity and insect-like extraterrestrial species that tend to parasitise human beings in order to reproduce."[71] The Encyclopedia of Science Fiction lists many instances of "parasitism", often causing the host's death.[77]

Notes

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  1. ^ The species has been introduced to Australia to control the spotted alfalfa aphid.[1]
  2. ^ Trophically transmitted parasites are transmitted to their definitive host, a predator, when their intermediate host is eaten. These parasites often modify the behaviour of their intermediate hosts, causing them to behave in a way that makes them likely to be eaten, such as by climbing to a conspicuous point: this gets the parasites transmitted at the cost of the intermediate host's life.
  3. ^ The wolf is a social predator, hunting in packs; the cheetah is a solitary predator, hunting alone. Neither strategy is conventionally considered parasitic.
  4. ^ There may be far more species of parasitoid wasp not yet described.
  5. ^ Darwin mentions "parasitic" wasps in On the Origin of Species, Chapter 7, page 218.[66]

References

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  1. ^ Wilson, C. G.; Swincer, D. E.; Walden, K. J. (1982). "The Introduction of Trioxys Complanatus Quilis (Hymenoptera: Aphidiidae), an Internal Parasite of the Spotted Alfalfa Aphid, into South Australia". Australian Journal of Entomology. 21 (1): 13–27. doi:10.1111/j.1440-6055.1982.tb01758.x. S2CID 84996305.13-27&rft.date=1982&rft_id=info:doi/10.1111/j.1440-6055.1982.tb01758.x&rft_id=https://api.semanticscholar.org/CorpusID:84996305#id-name=S2CID&rft.aulast=Wilson&rft.aufirst=C. G.&rft.au=Swincer, D. E.&rft.au=Walden, K. J.&rfr_id=info:sid/en.wikipedia.org:Parasitoid" class="Z3988">
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  4. ^ Wheeler, William Morton (9 January 1914). "Scientific Books | Lebensgewohnheiten und Instinkte der Insekten bis zum Erwachen der sozialen Instinkte". Science. 39 (993). American Association for the Advancement of Science (AAAS): 69–71. doi:10.1126/science.39.993.69.69-71&rft.date=1914-01-09&rft_id=info:doi/10.1126/science.39.993.69&rft.aulast=Wheeler&rft.aufirst=William Morton&rfr_id=info:sid/en.wikipedia.org:Parasitoid" class="Z3988">
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  9. ^ Poulin, Robert (2011). Rollinson, D.; Hay, S. I. (eds.). The Many Roads to Parasitism: A Tale of Convergence. Vol. 74. Academic Press. pp. 27–28. doi:10.1016/B978-0-12-385897-9.00001-X. ISBN 978-0-12-385897-9. PMID 21295676.27-28&rft.pub=Academic Press&rft.date=2011&rft_id=info:pmid/21295676&rft_id=info:doi/10.1016/B978-0-12-385897-9.00001-X&rft.isbn=978-0-12-385897-9&rft.au=Poulin, Robert&rft_id=https://books.google.com/books?id=9y4AlXka7t0C&pg=PA28&rfr_id=info:sid/en.wikipedia.org:Parasitoid" class="Z3988"> {{cite book}}: |journal= ignored (help)
  10. ^ Stevens, Alison N. P. (2010). "Predation, Herbivory, and Parasitism". Nature Education Knowledge. 3 (10): 36. Retrieved 12 February 2018. Predation, herbivory, and parasitism exist along a continuum of severity in terms of the extent to which they negatively affect an organism's fitness. ... In most situations, parasites do not kill their hosts. An exception, however, occurs with parasitoids, which blur the line between parasitism and predation.
  11. ^ Møller, A. P. (1990). "Effects of parasitism by a haematophagous mite on reproduction in the barn swallow". Ecology. 71 (6): 2345–2357. Bibcode:1990Ecol...71.2345M. doi:10.2307/1938645. JSTOR 1938645.2345-2357&rft.date=1990&rft_id=https://www.jstor.org/stable/1938645#id-name=JSTOR&rft_id=info:doi/10.2307/1938645&rft_id=info:bibcode/1990Ecol...71.2345M&rft.aulast=Møller&rft.aufirst=A. P.&rfr_id=info:sid/en.wikipedia.org:Parasitoid" class="Z3988">
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  13. ^ Askew, R. R. (1961). "On the biology of the inhabitants of oak galls of Cynipidae (Hymenoptera) in Britain". Transactions of the Society for British Entomology. 14: 237–268.237-268&rft.date=1961&rft.aulast=Askew&rft.aufirst=R. R.&rft_id=https://www.researchgate.net/publication/238289888&rfr_id=info:sid/en.wikipedia.org:Parasitoid" class="Z3988">
  14. ^ Gullan, P. J.; Cranston, P. S. (2014). The Insects: An Outline of Entomology (5th ed.). Wiley. pp. 365–369. ISBN 978-1-118-84615-5.365-369&rft.edition=5th&rft.pub=Wiley&rft.date=2014&rft.isbn=978-1-118-84615-5&rft.au=Gullan, P. J.&rft.au=Cranston, P. S.&rfr_id=info:sid/en.wikipedia.org:Parasitoid" class="Z3988">
  15. ^ Fisher, R. C. (1 June 1961). "A Study in Insect Multiparasitism: I. Host Selection and Oviposition" (PDF). Journal of Experimental Biology. 38 (2): 267–275. doi:10.1242/jeb.38.2.267.267-275&rft.date=1961-06-01&rft_id=info:doi/10.1242/jeb.38.2.267&rft.aulast=Fisher&rft.aufirst=R. C.&rft_id=http://jeb.biologists.org/cgi/reprint/38/2/267.pdf&rfr_id=info:sid/en.wikipedia.org:Parasitoid" class="Z3988">
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