Formica polyctena

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Formica polyctena
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Formicinae
Tribe: Formicini
Genus: Formica
Species: F. polyctena
Binomial name
Formica polyctena
Foerster, 1850

Formica polyctena casent0173865 profile 1.jpg

Formica polyctena casent0173865 dorsal 1.jpg

Specimen labels

Synonyms

A wood ant, which is one of a number of Palearctic Formica species that build complexes of large mound nests, have large numbers of workers and collect honeydew.


At a Glance • Polygynous  • Supercolonies  • Diploid male  

 

Photo Gallery

  • A Formica polyctena worker ready to defend its nest by spraying formic acid on the intruder. Photo by Michal Kukla.

Identification

Erect hairs on head and mesosoma very sparse and short or absent, except on posterior margins of mesopleura. Gula hairs, if present, are restricted to one or two very weak hairs. Microsculpture is usually slightly coarser than in F. rufa but punctures and micropunctures are widely spaced as in that species. Length: 4.0-8.5 mm (Collingwood 1979).

Keys including this Species

Distribution

Spain to Siberia, Italian Alps to latitude 60º in Sweden (Collingwood 1979).

Distribution based on Regional Taxon Lists

Oriental Region: India.
Palaearctic Region: Albania, Andorra, Austria, Belarus, Belgium, Bulgaria, China, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany (type locality), Greece, Hungary, Iberian Peninsula, Italy, Kazakhstan, Latvia, Lithuania, Luxembourg, Montenegro, Netherlands, Norway, Poland, Republic of Moldova, Romania, Russian Federation, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Ukraine.


Distribution based on AntMaps

AntMapLegend.png

Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Collingwood (1979) - This is accepted as a good species by most European authors, eg. Betrem (1960), Dlussky (1967), Kutter (1977). Some samples of Formica rufa tend to approach the hairless condition of F. polyctena however, making certain determination sometimes difficult. Elton (priv. communication) found that F. polyctena in its most typical form readily accepted fertile queens and pupae from other distant nests of the same species but were always antagonistic to and rejected such from both polygonous and monogynous colonies of F. rufa. This is usually found in a group of nests and always has many queens, sometimes up to 1,000 or more.

2004 Odenwald forest, Hesse, Germany. Contributed by A. Buschinger

This is a relatively well studied species and one that had long confounded myrmecologists in regards to its specific taxonomic identity. Collingwood's statements above are indicative of these problems. What follows is a more recent summary that provides insight into our latest understanding of this ant. This is taken from Siefert et al (2011). The details for the cited works are given in the original publication.

The wood ant species Formica polyctena and Formica rufa are important elements of temperate forest ecosystems of the West Palaearctic. They are considered to give protection against a number of pest insects in natural and secondary, managed forests (reviewed by Otto 1967) and are a symbol and main target of nature conservation in many countries of Europe. Yarrow (1955) and Betrem (1960) considered F. polyctena and F. rufa as clearly different species and this view had been generally adopted for 35 years. The situation changed when Seifert (1991) published a comprehensive study on external morphology and biological parameters of 430 nests collected in different regions of Central, East and North Europe. In addition to the typical F. polyctena and F. rufa, he found a third entity which was intermediate in each investigated phenotypic or biological character: body size, eight size-corrected pilosity characters, monogyny frequency, size of nest populations, diameter of nest mounds and infestation rate with epizootic fungi. He concluded that the third entity was a fertile hybrid between F. polyctena and F. rufa.

Foraging/Diet

Formica polyctena collect large quantities of honeydew.

Novgorodova (2015b) investigated ant-aphid interactions of a dozen honeydew collecting ant species in Western Siberia pine and aspen-birch-pine forests (54°7´N, 83°06´E, 200 m, Novosibirsk) and mixed-grass-cereal steppes with aspen-birch groves (53°44´N, 78°02´E, 110 m, near Karasuk) in the Novosibirsk Region and coniferous forests in the northeastern Altai (north end of Lake Teletskoe, 51°48´N, 87°17´E, 434 m). All of the ants studied had workers that showed high fidelity to attending particular aphid colonies, i.e, individual ants tend to return to the same location, and group of aphids, every time they leave the nest. F. polyctena's honeydew collecting activities were highly coordinated during the summer months when the aphids and ants were most active. Individual foragers specialized on specific tasks and could be classified as shepherds (collect honeydew), guards (protect aphids from competitors), scouts (search for new aphid colonies) and transporters (transport honeydew to the nest). Individuals performed the same type of work day after day, with groups of the same workers, thereby forming teams. In cooler months when aphids were still active foragers were less specialized: some ants were "on duty" (constantly present in a particular aphid colony, collecting honeydew and /or protecting aphids from various competitors) and others that showed no specialization. F. polyctena tended: Symydobius oblongus (Heyden), Chaitophorus populeti (Panzer), Aphis jacobaeae Schrank and A. grossulariae Kaltenbach.

Nesting Habits

Formica polyctena often forms huge supercolonies with several hundred nests. Nests can be vary large, particularly in coniferous forests.

Rybnikova and Kuznetsov (2015) studied nest complexes of wood ants in the Darwin Nature Reserve (Rybinsk Reservoir basin, Vologda and Yaroslavl Provinces, Russia). Their work assessed, in part, how wild boars and seasonal flooding may influence the survival and viability of wood ant colonies.

Formica polyctena nest. Czech Republic. Author:Michal Kukla [1]

A complex of raised and transitional sphagnum bogs is developed in the central part of the peninsula. The better drained areas near the shores are occupied by a strip of upland forests from 1 to 5 km wide, mostly represented by green moss, tall moss, and complex pine forests blending into sphagnum pine forests closer to the bogs. Small patches of lichen pine forests are present in the raised areas. The biotic complex of the reserve is affected by the water level fluctuations in the reservoir, due to which its vast shallow peripheral areas are annually flooded and exposed. However, the water level not only changes seasonally within one year but also varies from year to year, so that high-water and low-water years occur. The destruction of mature ant nests by boars leads to complete elimination of many colonies and stimulates fragmentation of the surviving colonies in spring. The results of exogenous fragmentation of the damaged nests include a decrease in the number of large nests, loss of their growth potentials, depopulation, and degradation. Regular and largescale destruction of ant nests by boars leads to rapid degradation and dying off of whole nest complexes (Dyachenko, 1999; Efremov, 2013).

Observations of the ants have been carried out since 1997. The parameters recorded were the number of inhabited nests in the complexes (n), the basal diameter of the nest dome (d), and the diameter of the nest mound (D).

The Eastern complex (Formica polyctena) is located in a maturing green moss pine forest with admixture of spruce and birch in the first layer, the second layer of spruce, and undergrowth of rowan and juniper. In 2001–2004, the complex comprised 30 nests with the mean basal diameter of 130 ± 38 cm and the mean dome height of 45 ± 16 cm. In 2005, the number of nests started to decline, and only 15 nests remained by 2010. The mean dome base diameter decreased nearly twofold, to 70 ± 31 cm, but the dome height was only insignificantly reduced, to 30 ± 16 cm.

The Southern complex (Formica polyctena) is located in a maturing green moss pine forest. In 1997 the complex included 11 inhabited nests, and in 2004, of 14 nests. The largest nest was fragmented after being destroyed by a wild boar in the winter of 1995, and in 1997 it consisted of three domes on a common mound. It also gave rise to several secondary nests which were built inside an area fenced off with mesh. These nests were never destroyed by boars; they are still quite viable and have distinctly conical domes. The size of the three fenced-off nests practically did not change since 1997. The mean basal diameter (d) of all the nests of the complex only slightly changed since the end of the 1990s: it was 150 ± 40 cm (n = 14) in 1998 and 135 ± 50 cm (n = 8) in 2010. At the same time, the dome height (h) decreased almost twofold, from 85 ± 28 cm (n = 14) in 1998 to 45 ± 40 cm (n = 8) in 2010, due to annual destruction of most nests by wild boars.

Silon Island is a tall ridge of glacial origin. The ant communities of the island were studied in the late 1990s (Rybnikova and Kuznetsov, 1998). The greatest part of the island is occupied by a lichen pine forest which provides little food for red wood ants; therefore, foraging mostly takes place in the riparian zone.

The complex of Silon Island—South. A small complex of F. polyctena exists under the above conditions in the southern part of the island. In 1997, the complex included 18 inhabited nests, which were large, conical, and connected with distinct trails. Some of them reached 70 cm in height (h) and 150–200 cm in dome diameter (d). All the nests were positioned along the shore. The foraging trails extended into the temporary inundation zone, where at a low water level the abundant periaquatic vegetation supported numerous aphid colonies. Since 2003 until now, the water level in the reservoir has remained high, and periaquatic vegetation has been reduced to a narrow stripe of sedges where ants cannot forage. As a result, only three nests have remained there by 2010, all of them being annually destroyed by bears and, less frequently, by boars. The complex is now declining due to a profound reduction of the trophic resources and repeated nest destruction.

Behavior

Milar et al. (2017) found in an experimental test, simulating being threatened with entrapment in sand (as might happen if falling in an ant lion pit or if subjected to a collapse of a ground nest), that this species did exhibit rescue behaviour. This was in agreement with their hypothesis that species that could face entrapment situations would show such a response. Formica polyctena occur in forest situations. While they have not evolved with ant lion predation they do face possible dangers from being stuck in clay, organic debris or plant secretions. Milar et al. suggested this species had developed a general rescue cue and response that applied even when threatened with an ant lion, which was a novel threat.

Holecová et al. (2016) found Formica polyctena to exhibit higher foraging activity between mid-November and mid-March in Slovakia.

Associations with other Organisms

This species is a host for the ant Formicoxenus nitidulus (a xenobiont) (Holldobler & Wilson 1990; Busch 2001; Martin et al. 2007).

This species is a host for the beetle Monotoma angusticollis (Coleopotera: Monotomidae) (a myrmecophile) in Europe (Wagner et al., 2020).

Zingg et al. (2018) found that F. polyctena were negatively correlated with the abundance of ticks in a field study conducted in the forests of the Jura Mountains, northwestern Switzerland. They examined the abundance of nymph and adult ticks in paired sites with and without F. polycenta. They found: the presence of red wood ants was negatively associated with the number of questing Ixodes ticks. Ant nest volume was the most important ant related variable and had a strong negative effect on tick abundance. The mechanisms that drive the negative relationship between wood ants and ticks remain unknown.Possible mechanisms include the repellent effect of ant formic acid, and the predatory behavior of the wood ants.

Fungi

This taxon is a host for the fungi Aegeritella superficialis (Espadaler & Santamaria, 2012) and Ophiocordyceps myrmecophila (Shrestha et al., 2017).

Transplanting Colonies

Nielson et al (2018) showed how colonies of this species could be usefully moved into cultivated areas in Denmark to help control pest species.

Life History Traits

  • Queen number: polygynous (Rissing and Pollock, 1988; Frumhoff & Ward, 1992)
  • Queen type: winged (Rissing and Pollock, 1988; Frumhoff & Ward, 1992) (queen-right worker reproduction)
  • Colony type: supercolony
  • Mean colony size: 450,000 (Rosengren, 1971; Kruk-de-Bruin et al., 1977; Horstmann, 1982; Beckers et al., 1989)
  • Nest site: thatch mound
  • Foraging behaviour: trunk trail (Rosengren, 1971; Kruk-de-Bruin et al., 1977; Horstmann, 1982; Beckers et al., 1989)

Castes

Queen

Male

Diploid males are known to occur in this species (found in 6.9% of 72 examined nests) (Pamilo et al., 1994; Cournault & Aron, 2009).

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • major. Formica major Nylander, 1849: 29 (w.) FINLAND. Junior synonym of rufa: Emery & Forel, 1879: 450. Revived from synonymy: Betrem, 1926: 213. Senior synonym of piniphila: Betrem, 1953: 325. Junior synonym of rufa: Yarrow, 1955a: 3; Betrem, 1960b: 76; Kutter, 1977c: 273; of polyctena: Radchenko, 2007: 37 (major is best regarded as a nomen oblitum, therefore polyctena takes priority).
  • polyctena. Formica polyctena Foerster, 1850a: 15 (w.q.m.) GERMANY. Junior synonym of rufa: Nylander, 1856b: 60; Emery & Forel, 1879: 450; Dalla Torre, 1893: 208; Yarrow, 1955a: 3. Subspecies of rufa: Forel, 1915d: 58; Emery, 1925b: 253; Stitz, 1939: 339; Boven, 1947: 189. Status as species: Bondroit, 1917a: 174; Müller, 1923: 144; Betrem, 1926: 212; Betrem, 1960b: 64; Dlussky, 1967a: 93; Dlussky & Pisarski, 1971: 187; Kutter, 1977c: 272; Collingwood, 1979: 144. Senior synonym of minor: Betrem, 1960b: 64; Dlussky, 1967a: 93; of nuda: Dlussky, 1967a: 93; Dlussky & Pisarski, 1971: 187; of major: Radchenko, 2007: 37 (major is best regarded as a nomen oblitum, therefore polyctena takes priority). See also: Mabelis, 1979: 451; Gösswald, 1989: 18; Atanassov & Dlussky, 1992: 279; Czechowski & Douwes, 1996: 125.
  • nuda. Formica (Formica) rufa var. nuda Karavaiev, 1930b: 148 (w.) SWEDEN. [Unresolved junior primary homonym of nuda Ruzsky, above.] Junior synonym of rufa: Karavaiev, 1936: 240; Yarrow, 1955a: 4; of polyctena: Dlussky, 1967a: 93; Dlussky & Pisarski, 1971: 187.
  • minor. Formica minor Gösswald, 1951: 436 (w.q.) GERMANY. [First available use of Formica rufa subsp. pratensis var. minor Gösswald, 1941: 78; unavailable name.] Junior synonym of polyctena: Betrem, 1960b: 64; Dlussky, 1967a: 93.

Description

Karyotype

  • n = 26, 2n = 52 (Finland; Switzerland) (Hauschteck-Jungen & Jungen, 1976; Rosengren et al., 1980).

References

  • Atanassov, N.; Dlussky, G. M. 1992. Fauna of Bulgaria. Hymenoptera, Formicidae. Fauna Bûlg. 22: 1-310 (page 279, see also)
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