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Christmas shearwater
	Adult taking off, French Frigate Shoals
Conservation status
	; Least Concern (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Procellariiformes
Family:	Procellariidae
Genus:	Puffinus
Species:	P. nativitatis
Binomial name
	Puffinus nativitatis; Streets, 1877

The Christmas shearwater or ʻaoʻū^[2] (Puffinus nativitatis) is a medium-sized shearwater of the tropical Central Pacific. It is a poorly known species due to its remote nesting habits, and it has not been extensively studied at sea either.^[3]

It is one member of a very ancient lineage of the small Puffinus species. Its only close living relative is the Galápagos shearwater (P. subalaris).

Taxonomy

The species was described and given its current binomial name by the American naturalist Thomas Hale Streets in 1877.^[4]^[5] A genetic analysis using mitochondrial DNA has shown that the closest living relative is the Galápagos shearwater (Puffinus subalaris).^[6]

Description

The Christmas shearwater is a slender-bodied shearwater, about 36 cm long, with a wingspan of around 75 cm, and weighs around 350 g. It has dark plumage all over, generally blackish-grey with a rusty-brown tinge, slightly paler on the underside of the bird, and with some small edging of white under the chin and pale fringes to the upperwing coverts. It has brown-grey feet and a dark bill and eyes. Both sexes are alike, as are the young after fledging. Nestlings are covered in dark grey down feathers.^[7]

The species closely resembles the sooty (Puffinus griseus) and short-tailed shearwaters (P. tenuirostris), but has dark brown underwings and is smaller. The short tail of the Christmas shearwater does not appear blunt except when spread, but in flight usually tapers to a point, enhanced by the feet which protrude beyond the tail-tip. It often flies in a leisurely way like the related Procellariidae, and thus can be mistaken for a petrel. In particular, it can appear similar to the extremely rare Fiji petrel (Pseudobulweria macgillivrayi), a gadfly petrel-like relative of the shearwaters. The two species share a similar morphology and colouration, but the bulbous head and rather thin long bill – typical for shearwaters – distinguish P. nativitatis from the slim-headed thick-billed Fiji petrel.^[7]

Distribution and habitat

The Christmas shearwater nests on remote islands of the Central Pacific: the Northwestern Hawaiian Islands, Tuamotu, the Marshall Islands, Kiritimati (for which the species is named) and Sala-y-Gómez. It has become locally extinct on a number of islands, including Wake Island. Outside of the breeding season it ranges across the Pacific, having been recorded off the coast of Mexico and Guatemala in the east, and Bonin Islands in the west. Further south it is rare, having been recorded off Fiji only twice (one time in early to mid-May).^[7]

Behaviour

Diet and feeding

Like its relatives it feeds at sea, predominantly on squid, and fish, mostly flying fish (Exocoetidae) and goatfish (Mullidae). It is highly pelagic and is dependent on predatory fish such as tuna driving prey to the surface. As mentioned above, it does not only have the dramatic stiff-winged "shearing" (dynamic soaring) flight technique which gave the shearwaters their common name. In addition to it, it may use the plesiomorphic flight technique of petrels and similar Procellariidae, moving about with slow, leisurely wingbeats.^[7]

Breeding

The Christmas shearwater nests on sandy islands with good cover. It nests on the surface, underneath dense cover (such as naupakas, Scaevola), or under rock outcroppings. It lays one white egg, the timing of laying varying from island to island, on some islands breeding throughout the year. The egg is incubated for around 50 days. The time taken to fledge varies depending on the season, ranging from 60 to 100 days.^[3]

Status and conservation

Although few specific studies have been conducted on the Christmas shearwaters, petrels and shearwaters are threatened worldwide by fishing, ingestion of plastic waste, and habitat degradation. For example, on Laysan Island the introduced rabbits degraded the scrub cover, leaving adults, chicks and eggs vulnerable to overheating, and introduced black rats took eggs and chicks. In 1985, the population on Sala-y-Gómez, a nature sanctuary, was estimated at 5,000. With its wide range and considerable numbers, the Christmas shearwater is considered a species of least concern by the IUCN.^[8]

Footnotes

^ BirdLife International (2018). "Puffinus nativitatis". IUCN Red List of Threatened Species. 2018: e.T22698222A132636216. doi:10.2305/IUCN.UK.2018-2.RLTS.T22698222A132636216.en. Retrieved 12 November 2021.
^ Gregg, Jason (12 May 2021). "Decolonizing Seabirds". Hakai Magazine. Archived from the original on 2021-05-12. Retrieved 2021-05-14.
^ ^a ^b Seto, N.W.H. (2001): Christmas Shearwater (Puffinus nativitatis). In: Poole, A. & Gill, F. (eds.): The Birds of North America 561. Academy of Natural Sciences, Philadelphia, PA & American Ornithologists' Union, Washington, D.C. doi:10.2173/bna.561 (requires subscription)
^ Streets, Thomas Hale (1877). "Contributions to the natural history of the Hawaiian and Fanning Islands and Lower California made in connexion with the United States North Pacific Surveying Expedition, 1873-1875". Bulletin of the United States National Museum. 1 (7): 29.
^ Meyer, Ernst; Cottrell, G William, eds. (1979). "Puffinus nativitatis". Checklist of birds of the world. Volume 1 (2nd ed.). Cambridge, Massachusetts: Museum of Comparative Zoology. pp. 94–95.
^ Austin, Jeremy J; Bretagnolle, Vincent; Pasquet, Eric (2004). "A global molecular phylogeny of the small puffinus shearwaters and implications for systematics of the little-audubon's shearwater complex". The Auk. 121 (3): 847–864. doi:10.1642/0004-8038(2004)121[0847:AGMPOT]2.0.CO;2. S2CID 86177092.
^ ^a ^b ^c ^d Seto (2001), Shirihai et al. (2009)
^ Seto (2001), BLI (2009)

References

Austin, Jeremy J. (1996): Molecular Phylogenetics of Puffinus Shearwaters: Preliminary Evidence from Mitochondrial Cytochrome b Gene Sequences. Mol. Phylogenet. Evol. 6(1): 77–88. doi:10.1006/mpev.1996.0060 (HTML abstract)
Seto, N.W.H. (2001): Christmas Shearwater (Puffinus nativitatis). In: Poole, A. & Gill, F. (eds.): The Birds of North America 561. Academy of Natural Sciences, Philadelphia, PA & American Ornithologists' Union, Washington, D.C. doi:10.2173/bna.561 (requires subscription)
Shirihai, Hadoram; Pym, Tony; Kretzschmar, Jörg; Moce, Kolinio; Taukei, Amania & Watling, Dick (2009): First observations of Fiji Petrel Pseudobulweria macgillivrayi at sea: off Gau Island, Fiji, in May 2009. Bull. B.O.C. 129(3): 129–148. PDF fulltext