Kelp goose

Kelp goose
Conservation status
	; Least Concern (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Anseriformes
Family:	Anatidae
Genus:	Chloephaga
Species:	C. hybrida
Binomial name
	Chloephaga hybrida; (Molina, 1782)
Subspecies
	C. h. hybrida (Molina, 1782); C. h. malvinarum (Phillips, 1916);

The kelp goose (Chloephaga hybrida) is a species of waterfowl in tribe Tadornini of subfamily Anserinae. It is found in Argentina, Chile, and the Falkland Islands.^[2]^[3]

Taxonomy and systematics

The kelp goose has two subspecies, the nominate C. h. hybrida and C. h. malvinarum.^[2]

Description

The kelp goose is 55 to 65 cm (22 to 26 in) long. Males of the nominate subspecies weigh 2.54 to 2.58 kg (5.6 to 5.7 lb) and females 2.00 to 2.02 kg (4.4 to 4.5 lb). Subspecies C. h. malvinarum is heavier: Males weigh 3.25 to 3.60 kg (7.2 to 7.9 lb) and females 2.05 to 2.80 kg (4.5 to 6.2 lb). The two subspecies have the same plumage but the sexes are completely different. Adult males are entirely white but for a black bill with a pink spot on the maxilla and yellow legs and feet. Adult females have a pale brown crown and chocolate brown head, neck, and mantle. Their breast and flanks have black and white bars and their back, tail, and undertail coverts are white. Their bill is pink and their legs and feet yellow. Juvenile males resemble adult females but with brown "shoulders" and greenish-yellow legs and feet. Juvenile females have a dark crown and dark uppertail coverts.^[4]

Distribution and habitat

The nominate subspecies of kelp goose is found on coastal southern Chile and Argentina including the Tierra del Fuego archipelago. C. h. malvinarum is found only on the Falkland Islands. Except when nesting, the species inhabits rocky coasts or shingle beaches with kelp beds offshore. It nests at coastal freshwater lakes.^[4]

Behavior

Movement

The nominate subspecies of kelp goose is found year-round along the southern Chile coast and in Tierra del Fuego. It is mostly sedentary, with some individuals moving further north in Chile and others north along the Atlantic coast of Argentina in the austral winter. C. h. malvinarum is also mostly sedentary throughout the Falklands, but some individuals move from more exposed offshore islands to larger ones in winter.^[4]

Feeding

The kelp goose is almost entirely vegetarian, though it probably ingests small invertebrates incidentally. It forages mostly by grazing though it sometimes dips under water to feed. On the coast it feeds on several species of seaweed and some algae. During breeding it feeds on grass and in winter sometimes on berries. During the summer, 100 or more non-breeding geese may gather on the shore.^[4]

Breeding

The kelp goose's breeding season (up to hatching) on the mainland extends from October to January; that on the Falklands begins somewhat sooner and extends only to November. The species nests in pairs or loose groups. It builds a nest of grass lined with down, on the mainland near somewhat inland freshwater lakes and on the Falklands close to the shore. Nests are sited in vegetation or beside a boulder or driftwood. The clutch size is three to seven eggs. Males guard females during the incubation period of about 30 days. Young leave the nest shortly after the last egg hatches and fledging occurs 12 to 13 weeks after hatch. Both parents care for the young into winter.^[4]

Songs and calls

Listen to kelp goose on xeno-canto

Vocalization

Male and female kelp geese have different vocalizations: Males make a "whistled 'si-si-si'" and females "low honking 'arnk-arnk', 'ooer' or 'ooeroo' calls". Very young chicks make "a double-noted 'cheep'."^[4]

Status

The IUCN has assessed the kelp goose as being of Least Concern. It has a large range, and though its population size is unknown it is believed to be stable. No immediate threats have been identified.^[1] It "does not compete with human interests due to inaccessibility and [the] types of habitats preferred" but "[c]ould be at risk from spillage of oil or other toxic substances on rocky coasts."^[4]

Gallery

Female on East Falkland
A pair on East Falkland
Two females, one male, and two juveniles on Chiloé Island, Chile.

References

^ ^a ^b BirdLife International (2016). "Kelp Goose Chloephaga hybrida". IUCN Red List of Threatened Species. 2016: e.T22679978A92837056. doi:10.2305/IUCN.UK.2016-3.RLTS.T22679978A92837056.en. Retrieved 12 November 2021.
^ ^a ^b Gill, F.; Donsker, D.; Rasmussen, P., eds. (August 2022). "Screamers, ducks, geese, swans". IOC World Bird List. v 12.2. Retrieved August 9, 2022.
^ HBW and BirdLife International (2021) Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world. Version 6. Available at: http://datazone.birdlife.org/userfiles/file/Species/Taxonomy/HBW-BirdLife_Checklist_v6_Dec21.zip retrieved August 7, 2022
^ ^a ^b ^c ^d ^e ^f ^g Carboneras, C. and G. M. Kirwan (2020). Kelp Goose (Chloephaga hybrida), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.kelgoo1.01 retrieved September 28, 2022