Dunnock

Dunnock
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Prunellidae
Genus: Prunella
Species: P. modularis
Binomial name
Prunella modularis
(Linnaeus, 1758)
Global range     Year-Round Range     Summer Range     Winter Range

The dunnock (Prunella modularis) is a small passerine, or perching bird, found throughout temperate Europe and into Asia. Dunnocks have also been successfully introduced into New Zealand. It is by far the most widespread member of the accentor family, which otherwise consists of mountain species. Other common names of the dunnock include the hedge accentor, hedge sparrow, or hedge warbler. The name "dunnock" comes from the Ancient British *dunnākos, meaning "little brown one."[2] However, common or garden English dun (dingy brown, dark-colored) and the diminutive ock would also produce dunnock. Cf. pillock.

Description

A European robin-sized bird, the dunnock typically measures 13.5–14 cm in length. It possesses a streaked back, somewhat resembling a small house sparrow. Like that species, the dunnock has a drab appearance in order to avoid predation. It is brownish underneath, and has a fine pointed bill. Adults have a grey head, and both sexes are similarly coloured.[2]

Distribution and habitat

Dunnocks reside in the more mild western and southern parts of the globe, inhabiting much of Europe including Lebanon, northern Iran, and the Caucasus. Dunnocks were successfully introduced into New Zealand during the 19th century, and are now widely distributed around the country and some offshore islands.[3][4] Favourite habitats include woodlands, shrubs, gardens, and hedgerows.[5]

Territoriality

Dunnock's song (France)
Dunnock’s song (UK)

The main call of the dunnock is a shrill, persistent tseep along with a high trilling note, which betrays the bird's otherwise inconspicuous presence. The song is rapid, thin and tinkling, a sweet warble which can be confused with that of the Eurasian wren, but is shorter and weaker.[6]

Dunnock singing from high perch

Dunnocks are territorial and may engage in conflict with other birds that encroach upon their nests.[5] Males sometimes share a territory and exhibit a strict dominance hierarchy. Nevertheless, this social dominance is not translated into benefits to the alpha male in terms of reproduction, since parternity is usually equally shared between males of the group.[7][8] Furthermore, members of a group are rarely related, and so competition can result.[9]

Female territorial ranges are almost always exclusive. However, sometimes, multiple males will cooperate to defend a single territory containing multiple females. Males exhibit a strong dominance hierarchy within groups: older birds tend to be the alpha males and first-year birds are usually the betas. Studies have found that close male relatives almost never share a territory.[9]

The male’s ability to access females generally depends on female range size, which is affected by the distribution of food. When resources are distributed in dense patches, female ranges tend to be small and easy for males to monopolize. Subsequent mating systems, as discussed below, reflect high reproductive success for males and relatively lower success for females. In times of scarcity, female territories expand to accommodate the lack of resources, causing males to have a more difficult time monopolizing females. Hence, females gain a reproductive advantage over males in this case.[9][10]

Breeding

Mating systems

Male dunnock pecking cloaca of female before mating

The dunnock possesses variable mating systems. Females are often polyandrous, breeding with two or more males at once,[11][12] which is quite rare among birds. This multiple mating system leads to the development of sperm competition amongst the male suitors. DNA fingerprinting has shown that chicks within a brood often have different fathers, depending on the success of the males at monopolising the female.[8] Males try to ensure their paternity by pecking at the cloaca of the female to stimulate ejection of rival males' sperm.[13] Dunnocks take just one-tenth of a second to copulate and can mate more than 100 times a day.[14] Males provide parental care in proportion to their mating success, so two males and a female can commonly be seen provisioning nestlings at one nest.

Other mating systems also exist within dunnock populations, depending on the ratio of male to females and the overlap of territories. When only one female and one male territory overlap, monogamy is preferred. Sometimes, two or three adjacent female territories overlap one male territory, and so polygyny is favored, with the male monopolising several females. Polygynandry also exists, in which two males jointly defend a territory containing several females. Polyandry, though, is the most common mating system of dunnocks found in nature. Depending on the population, males generally have the best reproductive success in polygynous populations, while females have the advantage during polyandry.[9][10]

Studies have illustrated the fluidity of dunnock mating systems. When given food in abundance, female territory size is reduced drastically. Consequently, males can more easily monopolise the females. Thus, the mating system can be shifted from one that favours female success (polyandry), to one that promotes male success (monogamy, polygynandry, or polygyny).[15]

Nest

Eggs, Collection Museum Wiesbaden
Dunnock nest and eggs

The dunnock builds a neat nest (predominantly from twigs and moss and lined with soft materials such as wool or feathers), low in a bush or conifer, where adults typically lay three to five unspotted blue eggs.[5]

Parental care and provisioning

Broods, depending on the population, can be raised by a lone female, multiple females with the part-time help of a male, multiple females with full-time help by a male, or by multiple females and multiple males. In pairs, the male and the female invest parental care at similar rates. However, in trios, the female and alpha male invest more care in chicks than does the beta male. In territories in which females are able to escape from males, both the alpha and beta males share provisioning equally. This last system represents the best case scenario for females, as it helps to ensure maximal care and the success of the young.

A study has found that males tend to not discriminate between their own young and those of another male in polyandrous or polygynandrous systems. However, they do vary their feeding depending on the certainty of paternity. If a male has greater access to a female, and therefore a higher chance of a successful fertilisation, during a specific mating period, it would provide more care towards the young.[15]

References

  1. ↑ BirdLife International (2012). "Prunella modularis". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  2. 1 2 Heather, Barrie; Rogertson, Hugh (2005). The Field Guide to the Birds of New Zealand (Revised ed.). Viking Press.
  3. ↑ "Dunnock | New Zealand Birds Online". www.nzbirdsonline.org.nz. Retrieved 2015-10-04.
  4. ↑ Santos, Eduardo (2012). "Discovery of previously unknown historical records on the introduction of dunnocks (Prunella modularis) into Otago, New Zealand during the 19th century". Notornis.
  5. 1 2 3 Montgomery, Sy. "Dunnock". Encyclopedia Britannica. Retrieved 23 September 2013.
  6. ↑ Peterson, Roger; Mountfort, Guy; Hollom, P.A.D. (1954). A Field Guide to the Birds of Britain and Europe. London: Collins.
  7. ↑ Burke, T.; Daviest, N. B.; Bruford, M. W.; Hatchwell, B. J. (1989-03-16). "Parental care and mating behaviour of polyandrous dunnocks Prunella modularis related to paternity by DNA fingerprinting". Nature 338 (6212): 249–251. doi:10.1038/338249a0.
  8. 1 2 Santos, Eduardo S. A.; Santos, Luana L. S.; Lagisz, Malgorzata; Nakagawa, Shinichi (2015-09-01). "Conflict and cooperation over sex: the consequences of social and genetic polyandry for reproductive success in dunnocks". Journal of Animal Ecology 84: n/a–n/a. doi:10.1111/1365-2656.12432. ISSN 1365-2656.
  9. 1 2 3 4 Davies, N. B.; I. R. Hartley (1996). "Food Patchiness, territory overlap and social systems: an experiment with dunnocks Prunella modulars". Journal of Animal Ecology 65: 837–846. doi:10.2307/5681.
  10. 1 2 Davies, N. B., Houston, A. I. (1986). Reproductive success of dunnocks, Prunella modularis, in a variable mating system. Journal of Animal Ecology.
  11. ↑ Davies, Nicholas (1992). Dunnock behaviour and social evolution. Oxford: Oxford University Press. ISBN 0198546742.
  12. ↑ Santos, Eduardo S. A.; Nakagawa, Shinichi (2013-07-09). "Breeding Biology and Variable Mating System of a Population of Introduced Dunnocks (Prunella modularis) in New Zealand". PLoS ONE 8 (7): e69329. doi:10.1371/journal.pone.0069329. PMC 3706400. PMID 23874945.
  13. ↑ Davies, N. B. (March 1983). "Polyandry, cloaca-pecking and sperm competition in dunnocks". Nature (Nature Publishing Group) 302 (5906): 334–336. doi:10.1038/302334a0.
  14. ↑ Birkhead, Tim (2012). Bird Sense.
  15. 1 2 Davies, N. B., Lundberg, A. (1984). Food distribution and a variable mating system in the dunnock, Prunella modularis. Journal of Animal Ecology.

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