Springtail

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Springtails
Temporal range: Early Devonian – present
Orchesella cincta.jpg
Orchesella cincta
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Arthropoda
Class: Entognatha (?)
Subclass: Collembola
Lubbock, 1871
Orders
Synonyms   [1]
  • Oligentoma
  • Oligoentoma

Springtails (Collembola) form the largest of the three lineages of modern hexapods that are no longer considered insects (the other two are the Protura and Diplura). Although the three orders are sometimes grouped together in a class called Entognatha because they have internal mouthparts, they do not appear to be any more closely related to one another than they are to all insects, which have external mouthparts.

Contents

Collembolans are omnivorous, free-living organisms that prefer moist conditions. They do not directly engage in the decomposition of organic matter, but contribute to it indirectly through the fragmentation of organic matter [2] and the control of soil microbial communities. [3] The word Collembola is from the ancient Greek κόλλαkólla "glue" and ἔμβολοςémbolos "peg"; this name was given due to the existence of the collophore, which was previously thought to stick to surfaces to stabilize the creature. [4]

Some DNA sequence studies [5] [6] [7] suggest that Collembola represent a separate evolutionary line from the other Hexapoda, but others disagree; [8] this seems to be caused by widely divergent patterns of molecular evolution among the arthropods. [9] The adjustments of traditional taxonomic rank for springtails reflects the occasional incompatibility of traditional groupings with modern cladistics: when they were included with the insects, they were ranked as an order; as part of the Entognatha, they are ranked as a subclass. If they are considered a basal lineage of Hexapoda, they are elevated to full class status.

Morphology

Isotoma with visible furcula Isotoma Habitus.jpg
Isotoma with visible furcula

Members of the Collembola are normally less than 6 mm (0.24 in) long, have six or fewer abdominal segments, and possess a tubular appendage (the collophore or ventral tube) with reversible, sticky vesicles, projecting ventrally from the first abdominal segment. [10] It is believed to be associated with fluid uptake and balance, excretion, and orientation of the organism itself. [11] Most species have an abdominal, tail-like appendage known as a furcula. It is located on the fourth abdominal segment of collembolans and is folded beneath the body, held under tension by a small structure called the retinaculum (or tenaculum). When released, it snaps against the substrate, flinging the springtail into the air and allowing for rapid evasion and migration. All of this takes place in as little as 18 milliseconds. [12] [11]

Springtails also possess the ability to reduce their body size by as much as 30% through subsequent ecdyses (molting) if temperatures rise high enough. The shrinkage is genetically controlled. Since warmer conditions increase metabolic rates and energy requirements in organisms, the reduction in body size is advantageous to their survival. [13]

The Poduromorpha and Entomobryomorpha have an elongated body, while the Symphypleona and Neelipleona have a globular body. Collembola lack a tracheal respiration system, which forces them to respire through a porous cuticle, with the notable exception of the Sminthuridae, which exhibit a rudimentary, although fully functional, tracheal system. [10] The anatomical variance present between different species partially depends on soil morphology and composition. Surface-dwellers are generally larger, have darker pigments, have longer antennae and functioning furcula. Sub-surface-dwellers are usually unpigmented, have elongated bodies, and reduced furcula. They can be categorized into four main forms according to soil composition and depth: atmobiotic, epedaphic, hemiedaphic, and euedaphic. Atmobiotic species inhabit macrophytes and litter surfaces. They are generally 8-10 millimeters in length, pigmented, have long limbs, and a full set of ocelli (photoreceptors). Epedaphic species inhabit upper litter layers and fallen logs. They are slightly smaller and have less pronounced pigments, as well as less developed limbs and ocelli than the atmobiotic species. Hemiedaphic species inhabit the lower litter layers of decomposing organic material. They are 1-2 millimeters in length, have dispersed pigmentation, shortened limbs, and a reduced number of ocelli. Euedaphic species inhabit upper mineral layers known as the humus horizon. They are smaller than hemiedaphic species; have soft, elongated bodies; lack pigmentation and ocelli; and have reduced or absent furca. [14] [15] [16]

Poduromorphs inhabit the epedaphic, hemiedaphic, and euedaphic layers and are characterized by their elongated bodies and conspicuous segmentation – three thoracic segments, six abdominal segments, and a prothorax. [16]

The digestive tract of collembolan species consists of three main components: the foregut, midgut, and hindgut. The midgut is surrounded by a network of muscles and lined with a monolayer of columnar or cuboidal cells. Its function is to mix and transport food from the lumen into the hindgut through contraction. Many species of syntrophic bacteria, archaea, and fungi are present in the lumen. These different digestive regions have varying pH to support specific enzymatic activities and microbial populations. The anterior portion of the midgut and hindgut is slightly acidic (with a pH of approximately 6.0) while the posterior midgut portion is slightly alkaline (with a pH of approximately 8.0). Between the midgut and hindgut is an alimentary canal called the pyloric region, which is a muscular sphincter. [11]

Systematics and evolution

Allacma fusca (Symphypleona) on rotting wood

Traditionally, the springtails were divided into the orders Arthropleona, Symphypleona, and occasionally also Neelipleona. The Arthropleona were divided into two superfamilies, the Entomobryoidea and the Poduroidea. However, recent phylogenetic studies show Arthropleona is paraphyletic. [17] [18] [19] Thus, the Arthropleona are abolished in modern classifications, and their superfamilies are raised in rank accordingly, being now orders Entomobryomorpha and the Poduromorpha. Technically, the Arthropleona are thus a partial junior synonym of the Collembola. [20]

The term "Neopleona" is essentially synonymous with Symphypleona + Neelipleona. [21] The Neelipleona was originally seen as a particularly advanced lineage of Symphypleona, based on the shared global body shape, but the global body of the Neelipleona is realized in a completely different way than in Symphypleona. Subsequently, the Neelipleona were considered as being derived from the Entomobryomorpha. Analysis of 18S and 28S rRNA sequence data, though, suggests that they form the most ancient lineage of springtails, which would explain their peculiar apomorphies. [8] This phylogenetic relationship was also confirmed using a phylogeny based on mtDNA [18] and whole-genome data. [19]

The latest whole-genome phylogeny supporting four orders of collembola: [19]

Neelipleona Neelus murinus (14048834018).jpg

Poduromorpha Brachystomella parvula juvenile (8204572060).jpg

Symphypleona Dark.round.springtail.1.jpg

Entomobryomorpha Orchesella cincta (6875710316).jpg

Springtails are attested to since the Early Devonian. [22] The fossil from 400  million years ago, Rhyniella praecursor , is the oldest terrestrial arthropod, and was found in the famous Rhynie chert of Scotland. Given its morphology resembles extant species quite closely, the radiation of the Hexapoda can be situated in the Silurian, 420  million years ago or more. [23] Additional research concerning the coprolites (fossilized feces) of ancient collembolans allowed researchers to track their lineages back some 412 million years. [11]

Fossil Collembola are rare. Instead, most are found in amber. [24] Even these are rare and many amber deposits carry few or no collembola. The best deposits are from the early Eocene of Canada and Europe, [25] Miocene of Central America, [26] and the mid-Cretaceous of Burma and Canada. [27] They display some unexplained characteristics: first, all but one of the fossils from the Cretaceous belong to extinct genera, whereas none of the specimens from the Eocene or the Miocene are of extinct genera; second, the species from Burma are more similar to the modern fauna of Canada than are the Canadian Cretaceous specimens.

There are about 3,600 different species. [28]

Ecology

Eating behavior

Specific feeding strategies and mechanisms are employed to match specific niches. [29] Herbivorous and detritivorous species fragment biological material present in soil and leaf litter, supporting decomposition and increasing the availability of nutrients for various species of microbes and fungi. [30] Carnivorous species maintain populations of small invertebrates such as nematodes, rotifers, and other collembolan species. [11] [14] Springtails commonly consume fungal hyphae and spores, but also have been found to consume plant material and pollen, animal remains, colloidal materials, minerals and bacteria. [31]

Distribution

Springtails are cryptozoa frequently found in leaf litter and other decaying material, [32] where they are primarily detritivores and microbivores, and one of the main biological agents responsible for the control and the dissemination of soil microorganisms. [33] In a mature deciduous woodland in temperate climate, leaf litter and vegetation typically support 30 to 40 species of springtails, and in the tropics the number may be over 100. [34]

"Snow flea" Snow Flea close up crop.JPG
"Snow flea"
A species of Sminthurinae (Symphypleona: Sminthuridae) CollembolaBMNH.jpg
A species of Sminthurinae (Symphypleona: Sminthuridae)

In sheer numbers, they are reputed to be one of the most abundant of all macroscopic animals, with estimates of 100,000 individuals per square meter of ground, [35] essentially everywhere on Earth where soil and related habitats (moss cushions, fallen wood, grass tufts, ant and termite nests) occur. [36] Only nematodes, crustaceans, and mites are likely to have global populations of similar magnitude, and each of those groups except mites is more inclusive: though taxonomic rank cannot be used for absolute comparisons, it is notable that nematodes are a phylum and crustaceans a subphylum. Most springtails are small and difficult to see by casual observation, but one springtail, the so-called snow flea ( Hypogastrura nivicola ), is readily observed on warm winter days when it is active and its dark color contrasts sharply with a background of snow. [37]

In addition, a few species routinely climb trees and form a dominant component of canopy faunas, where they may be collected by beating or insecticide fogging. [38] [39] These tend to be the larger (>2 mm) species, mainly in the genera Entomobrya and Orchesella , though the densities on a per square meter basis are typically 1–2 orders of magnitude lower than soil populations of the same species. In temperate regions, a few species (e.g. Anurophorus spp., Entomobrya albocincta, Xenylla xavieri , Hypogastrura arborea ) are almost exclusively arboreal. [36] In tropical regions a single square meter of canopy habitat can support many species of Collembola. [12]

The main ecological factor driving the local distribution of species is the vertical stratification of the environment: in woodland a continuous change in species assemblages can be observed from tree canopies to ground vegetation then to plant litter down to deeper soil horizons. [36] This is a complex factor embracing both nutritional and physiological requirements, together with behavioural trends, [40] dispersal limitation [41] and probable species interactions. Some species have been shown to exhibit negative [42] or positive [40] gravitropism, which adds a behavioural dimension to this still poorly understood vertical segregation. Experiments with peat samples turned upside down showed two types of responses to disturbance of this vertical gradient, called "stayers" and "movers". [43]

Dicyrtomina sp. on leaf Sminthuridae sp 01.jpg
Dicyrtomina sp. on leaf

As a group, springtails are highly sensitive to desiccation, because of their tegumentary respiration, [44] although some species with thin, permeable cuticles have been shown to resist severe drought by regulating the osmotic pressure of their body fluid. [45] The gregarious behaviour of Collembola, mostly driven by the attractive power of pheromones excreted by adults, [46] gives more chance to every juvenile or adult individual to find suitable, better protected places, where desiccation could be avoided and reproduction and survival rates (thereby fitness) could be kept at an optimum. [47] Sensitivity to drought varies from species to species [48] and increases during ecdysis. [49] Given that springtails moult repeatedly during their entire life (an ancestral character in Hexapoda) they spend much time in concealed micro-sites where they can find protection against desiccation and predation during ecdysis, an advantage reinforced by synchronized moulting. [50] The high humidity environment of many caves also favours springtails and there are numerous cave adapted species, [51] [52] including one, Plutomurus ortobalaganensis living 1,980 metres (6,500 ft) down the Krubera Cave. [53]

Anurida maritima on water Anurida maritima.jpg
Anurida maritima on water

The horizontal distribution of springtail species is affected by environmental factors which act at the landscape scale, such as soil acidity, moisture and light. [36] Requirements for pH can be reconstructed experimentally. [54] Altitudinal changes in species distribution can be at least partly explained by increased acidity at higher elevation. [55] Moisture requirements, among other ecological and behavioural factors, explain why some species cannot live aboveground, [56] or retreat in the soil during dry seasons, [57] but also why some epigeal springtails are always found in the vicinity of ponds and lakes, such as the hygrophilous Isotomurus palustris . [58] Adaptive features, such as the presence of a fan-like wettable mucro, allow some species to move at the surface of water ( Sminthurides aquaticus , Sminthurides malmgreni ). Podura aquatica , a unique representative of the family Poduridae (and one of the first springtails to have been described by Carl Linnaeus), spends its entire life at the surface of water, its wettable eggs dropping in water until the non-wettable first instar hatches then surfaces. [59]

In a variegated landscape, made of a patchwork of closed (woodland) and open (meadows, cereal crops) environments, most soil-dwelling species are not specialized and can be found everywhere, but most epigeal and litter-dwelling species are attracted to a particular environment, either forested or not. [36] [60] As a consequence of dispersal limitation, landuse change, when too rapid, may cause the local disappearance of slow-moving, specialist species, [61] a phenomenon the measure of which has been called colonisation credit. [62] [63]

Relationship with humans

Tomocerus sp. from Germany Tomocerus.sp.1.jpg
Tomocerus sp. from Germany

Springtails are well known as pests of some agricultural crops. Sminthurus viridis , the lucerne flea, has been shown to cause severe damage to agricultural crops, [64] and is considered as a pest in Australia. [65] [66] Onychiuridae are also known to feed on tubers and to damage them to some extent. [67] However, by their capacity to carry spores of mycorrhizal fungi and mycorrhiza helper bacteria on their tegument, soil springtails play a positive role in the establishment of plant-fungal symbioses and thus are beneficial to agriculture. [68] They also contribute to controlling plant fungal diseases through their active consumption of mycelia and spores of damping-off and pathogenic fungi. [69] [70] It has been suggested that they could be reared to be used for the control of pathogenic fungi in greenhouses and other indoor cultures. [71] [72]

Various sources and publications have suggested that some springtails may parasitize humans, but this is entirely inconsistent with their biology, and no such phenomenon has ever been scientifically confirmed, though it has been documented that the scales or hairs from collembolans can cause irritation when rubbed onto the skin. [73] They may sometimes be abundant indoors in damp places such as bathrooms and basements, and incidentally found on one's person. More often, claims of persistent human skin infection by springtails may indicate a neurological problem, such as delusional parasitosis, a psychological rather than entomological problem. Researchers themselves may be subject to psychological phenomena. For example, a publication in 2004 claiming that springtails had been found in skin samples was later determined to be a case of pareidolia; that is, no springtail specimens were actually recovered, but the researchers had digitally enhanced photos of sample debris to create images resembling small arthropod heads, which then were claimed to be springtail remnants. [73] [74] [75] [76] [77] However, Steve Hopkin reports one instance of an entomologist aspirating an Isotoma species and in the process accidentally inhaling some of their eggs, which hatched in his nasal cavity and made him quite ill until they were flushed out. [34]

In 1952, China accused the United States military of spreading bacteria-laden insects and other objects during the Korean War by dropping them from P-51 fighters above rebel villages over North Korea. In all, the U.S. was accused of dropping ants, beetles, crickets, fleas, flies, grasshoppers, lice, springtails, and stoneflies as part of a biological warfare effort. The alleged associated diseases included anthrax, cholera, dysentery, fowl septicemia, paratyphoid, plague, scrub typhus, small pox, and typhoid. China created an international scientific commission for investigating possible bacterial warfare, eventually ruling that the United States probably did engage in limited biological warfare in Korea. The US government denied all the allegations, and instead proposed that the United Nations send a formal inquiry committee to China and Korea, but China and Korea refused to cooperate. U.S. and Canadian entomologists further claimed that the accusations were ridiculous and argued that anomalous appearances of insects could be explained through natural phenomena. [78] Springtail species cited in allegations of biological warfare in the Korean War were Isotoma (Desoria) negishina (a local species) and the "white rat springtail" Folsomia candida . [79]

Captive springtails are often kept in a terrarium as part of a clean-up crew. [80]

Ecotoxicology laboratory animals

Springtails are currently used in laboratory tests for the early detection of soil pollution. Acute and chronic toxicity tests have been performed by researchers, mostly using the parthenogenetic isotomid Folsomia candida. [81] These tests have been standardized. [82] Details on a ringtest, on the biology and ecotoxicology of Folsomia candida and comparison with the sexual nearby species Folsomia fimetaria (sometimes preferred to Folsomia candida) are given in a document written by Paul Henning Krogh. [83] Care should be taken that different strains of the same species may be conducive to different results. Avoidance tests have been also performed. [84] They have been standardized, too. [85] Avoidance tests are complementary to toxicity tests, but they also offer several advantages: they are more rapid (thus cheaper), more sensitive and they are environmentally more reliable, because in the real world Collembola move actively far from pollution spots. [86] It may be hypothesized that the soil could become locally depauperated in animals (and thus improper to normal use) while below thresholds of toxicity. Contrary to earthworms, and like many insects and molluscs, Collembola are very sensitive to herbicides and thus are threatened in no-tillage agriculture, which makes a more intense use of herbicides than conventional agriculture. [87] The springtail Folsomia candida is also becoming a genomic model organism for soil toxicology. [88] [89] With microarray technology the expression of thousands of genes can be measured in parallel. The gene expression profiles of Folsomia candida exposed to environmental toxicants allow fast and sensitive detection of pollution, and additionally clarifies molecular mechanisms causing toxicology.

Collembola have been found to be useful as bio-indicators of soil quality. Laboratory studies have been conducted that validated that the jumping ability of springtails can be used to evaluate the soil quality of Cu- and Ni-polluted sites. [90]

Climate warming impact

In polar regions that are expected to experience among the most rapid impact from climate warming, springtails have shown contrasting responses to warming in experimental warming studies. [91] There are negative, [92] [93] positive [94] [95] and neutral responses reported. [93] [96] Neutral responses to experimental warming have also been reported in studies of non-polar regions. [97] The importance of soil moisture has been demonstrated in experiments using infrared heating in an alpine meadow, which had a negative effect on mesofauna biomass and diversity in drier parts and a positive effect in moist sub-areas. [98] Furthermore, a study with 20 years of experimental warming in three contrasting plant communities found that small scale heterogeneity may buffer springtails to potential climate warming. [96]

Reproduction

Sexual reproduction occurs through the clustered or scattered deposition of spermatophores by male adults. Stimulation of spermatophore deposition by female pheromones has been demonstrated in Sinella curviseta . [99] Mating behavior can be observed in Symphypleona. [100] Among Symphypleona, males of some Sminthuridae use a clasping organ located on their antenna. [32] Many collembolan species, mostly those living in deeper soil horizons, are parthenogenetic, which favors reproduction to the detriment of genetic diversity and thereby to population tolerance of environmental hazards. [101] Parthenogenesis (also called thelytoky) is under the control of symbiotic bacteria of the genus Wolbachia , which live, reproduce and are carried in female reproductive organs and eggs of Collembola. [102] Feminizing Wolbachia species are widespread in arthropods [103] and nematodes, [104] where they co-evolved with most of their lineages.

See also

Related Research Articles

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Pancrustacea Clade comprising all crustaceans and hexapods

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Entognatha Class of wingless and ametabolous arthropods

The Entognatha are a class of wingless and ametabolous arthropods, which, together with the insects, makes up the subphylum Hexapoda. Their mouthparts are entognathous, meaning that they are retracted within the head, unlike the insects. Entognatha are apterous, meaning that they lack wings. The class contains three orders: Collembola (springtails), Diplura (“two-tail”) and Protura (“first-tail”), and over 5000 known species. These three groups were historically united with the now-obsolete order Thysanura to form the class Apterygota, but it has since been recognized that the hexapodous condition of these animals has evolved independently from that of insects, and independently within each order. The orders may not be closely related, and Entognatha is now considered to be a polyphyletic group.

Rhyniella is a genus of fossil springtails (Collembola) from the Rhynie chert, which formed during the Pragian stage of the Early Devonian. One species has been described, Rhyniella praecursor. Its name means "small creature of the Rhynie chert, a forerunner [of modern hexapoda]". For some time it was believed to be the only hexapod from the Early Devonian. It was possibly the same animal as Rhyniognatha (partim).

<i>Anurida maritima</i> Species of springtail

Anurida maritima is a cosmopolitan collembolan of the intertidal zone. It is often found in aggregations of up to several hundred on the surface of rock-pools.

Symphypleona Order of springtails

The order Symphypleona is one of the three main groups of springtails (Collembola), tiny hexapods related to insects. When the springtails were still believed to be an order of insects, the Symphypleona were ranked as a suborder.

Insect Class of arthropods

Insects are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body, three pairs of jointed legs, compound eyes and one pair of antennae. Insects are the most diverse group of animals; they include more than a million described species and represent more than half of all known living organisms. The total number of extant species is estimated at between six and ten million; potentially over 90% of the animal life forms on Earth are insects. Insects may be found in nearly all environments, although only a small number of species reside in the oceans, which are dominated by another arthropod group, crustaceans, which recent research has indicated insects are nested within.

<i>Orchesella cincta</i> Species of springtail

Orchesella cincta is a species of springtail present in North America and Europe. They average 4 millimetres (0.16 in) in length, which is extremely large as most springtails don’t grow past 1 millimetre. The specific name cincta means "belted" and refers to the distinctive colouration of the third abdominal segment.

<i>Allacma fusca</i> Species of springtail

Allacma fusca is a species of springtail. This species is endemic to western areas of Continental Europe and the British Isles, where it lives in the surface layers of the soil in moist habitats such as among leaf litter.

<i>Folsomia candida</i> Species of springtail

Folsomia candida is a species of springtail in the family Isotomidae. It is found in soil in many locations around the world, having been spread inadvertently by humans. It reproduces by parthenogenesis and has been used as a model organism in research.

Soil mesofauna

Soil mesofauna are invertebrates between 0.1mm and 2mm in size, which live in the soil or in a leaf litter layer on the soil surface. Members of this group include nematodes, mites, springtails (collembola), proturans, pauropods, rotifers, tardigrades, small spiders, pseudoscorpions, opiliones (harvestmen), enchytraeidae such as potworms, insect larvae, small isopods and myriapods. They play an important part in the carbon cycle and are likely to be adversely affected by climate change.

Hexapoda Subphylum of arthropods

The subphylum Hexapoda comprises most species of arthropods and includes the insects as well as three much smaller groups of wingless arthropods: Collembola, Protura, and Diplura. The Collembola are very abundant in terrestrial environments. Hexapods are named for their most distinctive feature: a consolidated thorax with three pairs of legs. Most other arthropods have more than three pairs of legs. Most recent studies have recovered Hexapoda as a subgroup of Crustacea.

<i>Folsomia</i> Genus of springtails

Folsomia is a genus of elongate-bodied springtails in the family Isotomidae. There are more than 110 described species in Folsomia.

<i>Folsomia fimetaria</i> Species of springtail

Folsomia fimetaria is an elongate-bodied springtail of the genus Folsomia. It differs from other members of the Folsomia genus, in that the ventral setae on the third segment of the thorax are absent. It its maxillary head their lamella 1 is fan-shaped and has a double fringe, also its apical row has complex cilia. F. fimetaria inhabits in rich organic soils, disturbed biotopes and cities. It also seems to be a high-quality prey, since, when eaten by Bembidion lampros they seem to improve their fecundity and their larval survival.

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