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Common pochard

From Wikipedia, the free encyclopedia

Common pochard
Aythya ferina Sandwell 2.jpg
Male
Common pochard (Aythya ferina).jpg
Female
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Anseriformes
Family: Anatidae
Genus: Aythya
Species:
A. ferina
Binomial name
Aythya ferina
AythyaFerinaIUCNver2018 2.png
Range of A. ferina
  Breeding
  Resident
  Non-breeding
Synonyms

Anas ferina Linnaeus, 1758

The common pochard (/ˈpɒərd/; Aythya ferina) is a medium-sized diving duck. The scientific name is derived from Greek aithuia an unidentified seabird mentioned by authors including Hesychius and Aristotle, and Latin ferina, "wild game", from ferus, "wild".[2]

Description

The adult male has a long dark bill with a grey band, a red head and neck, a black breast, red eyes and a grey back. The adult female has a brown head and body and a narrower grey bill-band. The triangular head shape is distinctive. Pochards are superficially similar to the closely related North American redhead and canvasback.

Females give hoarse growls. Males have whistles cut off by a final nasal note aaoo-oo-haa.

Distribution and habitat

Their breeding habitat consists of marshes and lakes with a metre or more water depth. Pochards breed in much of temperate and northern Europe and across the Palearctic. They are migratory, and spend winter in the south and west of Europe.

In the British Isles, birds breed in eastern England and lowland Scotland, in small numbers in Northern Ireland with numbers increasing gradually, and sporadically in the Republic of Ireland, where it may also be increasing. While uncommon, individuals are also occasionally seen in the south of England, and small populations are sometimes observed on the River Thames. Large numbers stay overwinter in Great Britain, after the birds retreat from Russia and Scandinavia.

Ecology

These are gregarious birds, forming large flocks in winter, often mixed with other diving ducks such as the tufted duck, with which they are known to hybridise.

These birds feed mainly by diving or dabbling. They eat aquatic plants with some molluscs, aquatic insects and small fish. They often feed at night, and will up-end for food as well as the more characteristic diving. According to the article 'Patterns in the diving behaviour of the pochard, Aythya ferina: a test of an optimality model' Pochard's have a behavioral preference when it comes to their feeding patterns. This behavioral preference is that Pochards prefer shallower water in comparison to deeper water even though the food concentration in deeper water may be higher.

In number of countries the population of Common Pochard is decreasing mainly due to urbanization of the natural habitats and their transformation, as well as due to overhunting.[3] The pochard is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.

References

  1. ^ BirdLife International (2015). "Aythya ferina". IUCN Red List of Threatened Species. 2015: e.T22680358A82571892. doi:10.2305/IUCN.UK.2015-4.RLTS.T22680358A82571892.en.
  2. ^ Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. pp. 64, 158. ISBN 978-1-4081-2501-4.
  3. ^ Common Pochard (Aythya ferina) in Armenia. 2017. In online publication: "The State of Breeding Birds of Armenia". TSE NGO, Armenian Bird Census Council. Retrieved on 10 October 2017.

Further reading

  • Carbone, C.; Houston, A.I. (August 1994). "Patterns in the diving behaviour of the pochard, Aythya ferina: a test of an optimality model". Animal Behaviour. 48 (2): 457–465. doi:10.1006/anbe.1994.1259. S2CID 53186922.

External links

This page was last edited on 2 December 2020, at 04:10
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